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Gartner Inc – ‘10-Q’ for 9/30/19 – ‘EX-101.LAB’

On:  Thursday, 10/31/19, at 6:31am ET   ·   For:  9/30/19   ·   Accession #:  749251-19-25   ·   File #:  1-14443

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  As Of               Filer                 Filing    For·On·As Docs:Size

10/31/19  Gartner Inc                       10-Q        9/30/19   80:11M

Quarterly Report   —   Form 10-Q   —   Sect. 13 / 15(d) – SEA’34
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-Q        Quarterly Report                                    HTML   1.36M 
 2: EX-31.1     Certification -- §302 - SOA'02                      HTML     31K 
 3: EX-31.2     Certification -- §302 - SOA'02                      HTML     31K 
 4: EX-32       Certification -- §906 - SOA'02                      HTML     27K 
22: R1          Cover Page                                          HTML     79K 
51: R2          Condensed Consolidated Balance Sheets               HTML    105K 
76: R3          Condensed Consolidated Balance Sheets               HTML     46K 
                (Parentheticals)                                                 
34: R4          Condensed Consolidated Statements of Operations     HTML     99K 
23: R5          Condensed Consolidated Statements of Comprehensive  HTML     49K 
                Income                                                           
52: R6          Condensed Consolidated Statements of Cash Flows     HTML    104K 
77: R7          Business and Basis of Presentation                  HTML    278K 
33: R8          Computation of Earnings Per Share                   HTML     60K 
26: R9          Stock-Based Compensation                            HTML    142K 
36: R10         Segment Information                                 HTML    133K 
10: R11         Goodwill and Intangible Assets                      HTML     98K 
57: R12         Debt                                                HTML     63K 
66: R13         Equity                                              HTML    245K 
37: R14         Income Taxes                                        HTML     34K 
11: R15         Derivatives and Hedging                             HTML     87K 
58: R16         Fair Value Disclosures                              HTML     61K 
67: R17         Employee Benefits                                   HTML     27K 
35: R18         Contingencies                                       HTML     28K 
12: R19         Subsequent Event                                    HTML     27K 
49: R20         Business and Basis of Presentation (Policies)       HTML    302K 
79: R21         Business and Basis of Presentation (Tables)         HTML    226K 
31: R22         Computation of Earnings Per Share (Tables)          HTML     60K 
24: R23         Stock-Based Compensation (Tables)                   HTML    161K 
50: R24         Segment Information (Tables)                        HTML    132K 
80: R25         Goodwill and Intangible Assets (Tables)             HTML    100K 
32: R26         Debt (Tables)                                       HTML     49K 
25: R27         Equity (Tables)                                     HTML    248K 
53: R28         Derivatives and Hedging (Tables)                    HTML     89K 
78: R29         Fair Value Disclosures (Tables)                     HTML     56K 
64: R30         Business and Basis of Presentation - Narrative      HTML     28K 
                (Details)                                                        
56: R31         Business and Basis of Presentation -                HTML     59K 
                Disaggregation of Revenue by Geographic Area                     
                (Details)                                                        
14: R32         Business and Basis of Presentation - Timing Of      HTML     51K 
                Revenue Recognition Liabilities per Segment                      
                (Details)                                                        
40: R33         Business and Basis of Presentation - Revenue        HTML     34K 
                Remaining Performance Obligation (Details)                       
63: R34         Business and Basis of Presentation - Schedule of    HTML     39K 
                Contract with Customer, Asset and Liability                      
                (Details)                                                        
55: R35         Business and Basis of Presentation - Additional     HTML     92K 
                Information (Details)                                            
13: R36         Business and Basis of Presentation - Net Lease      HTML     48K 
                Costs (Details)                                                  
39: R37         Business and Basis of Presentation - Lease          HTML     66K 
                Maturity (Details)                                               
65: R38         Business and Basis of Presentation - Supplemental   HTML     34K 
                Balance Sheet Information (Details)                              
54: R39         Business and Basis of Presentation - Leases Under   HTML     47K 
                Topic 840 (Details)                                              
74: R40         Computation of Earnings Per Share - Calculations    HTML     51K 
                Of Basic And Diluted (Loss) Earnings Per Share                   
                (Details)                                                        
48: R41         Computation of Earnings Per Share - Additional      HTML     26K 
                information (Details)                                            
18: R42         Stock-Based Compensation - Additional Information   HTML     48K 
                (Details)                                                        
28: R43         Stock-Based Compensation - Stock-based              HTML     45K 
                Compensation Expense by Award Type and Expense                   
                Category (Details)                                               
73: R44         Stock-Based Compensation - Summary Of Changes In    HTML     95K 
                SARs Outstanding (Details)                                       
47: R45         Stock-Based Compensation - Weighted Average         HTML     36K 
                Assumptions Used To Determine Fair Value Of SARs                 
                Grants On Date Of Grant Using Black-Scholes                      
                (Details)                                                        
17: R46         Stock-Based Compensation - Summary Of Changes In    HTML     74K 
                RSUs Outstanding (Details)                                       
27: R47         Stock-Based Compensation - Summary Of Changes In    HTML     48K 
                CSEs Outstanding (Details)                                       
75: R48         Segment Information - Information About Reportable  HTML     51K 
                Segments (Details)                                               
46: R49         Segment Information - Reconciliation of Segment     HTML     62K 
                Gross Contribution to Net Income (Details)                       
59: R50         Goodwill and Intangible Assets - Changes to         HTML     46K 
                Carrying Amount of Goodwill by Reporting Unit                    
                (Details)                                                        
70: R51         Goodwill and Intangible Assets - Carrying Amounts   HTML     74K 
                of Amortizable Intangible Assets (Details)                       
41: R52         Goodwill and Intangible Assets - Estimated Future   HTML     40K 
                Amortization Expense By Year From Amortizable                    
                Intangibles (Details)                                            
15: R53         Debt - Narrative (Details)                          HTML     65K 
60: R54         Debt - Borrowings (Details)                         HTML     41K 
71: R55         Debt - Footnote to Borrowings (Details)             HTML     69K 
42: R56         Debt - Interest Rate Swaps (Details)                HTML     41K 
16: R57         Equity - Share Repurchase Program and Share         HTML     35K 
                Repurchase Activity (Details)                                    
62: R58         Equity - Stockholders' Equity (Details)             HTML     79K 
69: R59         Equity - Changes in AOCI/L by Component (Details)   HTML     69K 
29: R60         Income Taxes (Details)                              HTML     38K 
19: R61         Derivatives and Hedging - Outstanding Derivatives   HTML     52K 
                Contracts (Details)                                              
43: R62         Derivatives and Hedging - Amounts Recognized in     HTML     31K 
                the Condensed Consolidated Statements of                         
                Operations for Derivative Contracts (Details)                    
72: R63         Fair Value Disclosures - Assets And Liabilities     HTML     51K 
                Measured At Fair Value On Recurring Basis                        
                (Details)                                                        
30: R64         Employee Benefits (Details)                         HTML     26K 
20: R65         Contingencies (Details)                             HTML     25K 
44: R66         Subsequent Events - (Details)                       HTML     31K 
45: XML         IDEA XML File -- Filing Summary                      XML    145K 
21: XML         XBRL Instance -- it-09302019x10q_htm                 XML   3.62M 
38: EXCEL       IDEA Workbook of Financial Reports                  XLSX    106K 
 6: EX-101.CAL  XBRL Calculations -- it-20190930_cal                 XML    222K 
 7: EX-101.DEF  XBRL Definitions -- it-20190930_def                  XML    698K 
 8: EX-101.LAB  XBRL Labels -- it-20190930_lab                       XML   1.67M 
 9: EX-101.PRE  XBRL Presentations -- it-20190930_pre                XML   1.04M 
 5: EX-101.SCH  XBRL Schema -- it-20190930                           XSD    165K 
68: JSON        XBRL Instance as JSON Data -- MetaLinks              355±   539K 
61: ZIP         XBRL Zipped Folder -- 0000749251-19-000025-xbrl      Zip    301K

‘EX-101.LAB’   —   XBRL Labels — it-20190930_lab

This Exhibit is an XBRL XML File.

                                                                                                                                                                                
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<link:label id="lab_us-gaap_CostsAndExpensesAbstract_C1F3B6EC654B5D760B9116F5235F1387_terseLabel_en-US" xlink:label="lab_us-gaap_CostsAndExpensesAbstract_C1F3B6EC654B5D760B9116F5235F1387" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Costs and expenses: </link:label>
<link:label id="lab_us-gaap_CostsAndExpensesAbstract_C1F3B6EC654B5D760B9116F5235F1387_label_en-US" xlink:label="lab_us-gaap_CostsAndExpensesAbstract_C1F3B6EC654B5D760B9116F5235F1387" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Costs and Expenses [Abstract] </link:label>
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<link:label id="lab_us-gaap_CostOfGoodsAndServicesSold_90F927D0899B6623130D16F5235FDBE5_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfGoodsAndServicesSold_90F927D0899B6623130D16F5235FDBE5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cost of services and product development </link:label>
<link:label id="lab_us-gaap_CostOfGoodsAndServicesSold_90F927D0899B6623130D16F5235FDBE5_label_en-US" xlink:label="lab_us-gaap_CostOfGoodsAndServicesSold_90F927D0899B6623130D16F5235FDBE5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cost of Goods and Services Sold </link:label>
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<link:label id="lab_us-gaap_SellingGeneralAndAdministrativeExpense_C0D1663BCF513584882C16F523600A5B_terseLabel_en-US" xlink:label="lab_us-gaap_SellingGeneralAndAdministrativeExpense_C0D1663BCF513584882C16F523600A5B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Selling, general and administrative </link:label>
<link:label id="lab_us-gaap_SellingGeneralAndAdministrativeExpense_C0D1663BCF513584882C16F523600A5B_label_en-US" xlink:label="lab_us-gaap_SellingGeneralAndAdministrativeExpense_C0D1663BCF513584882C16F523600A5B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Selling, General and Administrative Expense </link:label>
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<link:label id="lab_us-gaap_DepreciationDepletionAndAmortization_2BA573287F3F22BCB7F716F5236058FA_terseLabel_en-US" xlink:label="lab_us-gaap_DepreciationDepletionAndAmortization_2BA573287F3F22BCB7F716F5236058FA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Depreciation and amortization </link:label>
<link:label id="lab_us-gaap_DepreciationDepletionAndAmortization_2BA573287F3F22BCB7F716F5236058FA_label_en-US" xlink:label="lab_us-gaap_DepreciationDepletionAndAmortization_2BA573287F3F22BCB7F716F5236058FA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Depreciation, Depletion and Amortization </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_2BA573287F3F22BCB7F716F5236058FA" xlink:type="locator"/>
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<link:label id="lab_it_BusinessCombinationAcquisitionandIntegrationRelatedCosts_09880D5AE097953F1FE116F5236010D6_verboseLabel_en-US" xlink:label="lab_it_BusinessCombinationAcquisitionandIntegrationRelatedCosts_09880D5AE097953F1FE116F5236010D6" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Acquisition and integration charges </link:label>
<link:label id="lab_it_BusinessCombinationAcquisitionandIntegrationRelatedCosts_09880D5AE097953F1FE116F5236010D6_label_en-US" xlink:label="lab_it_BusinessCombinationAcquisitionandIntegrationRelatedCosts_09880D5AE097953F1FE116F5236010D6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Business Combination, Acquisition and Integration Related Costs </link:label>
<link:label id="lab_it_BusinessCombinationAcquisitionandIntegrationRelatedCosts_09880D5AE097953F1FE116F5236010D6_documentation_en-US" xlink:label="lab_it_BusinessCombinationAcquisitionandIntegrationRelatedCosts_09880D5AE097953F1FE116F5236010D6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Business Combination, Acquisition and Integration Related Costs </link:label>
<link:loc xlink:href="it-20190930.xsd#it_BusinessCombinationAcquisitionandIntegrationRelatedCosts" xlink:label="loc_it_BusinessCombinationAcquisitionandIntegrationRelatedCosts_09880D5AE097953F1FE116F5236010D6" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingIncomeLoss_859503073FA414C1C5A216F523607362_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_859503073FA414C1C5A216F523607362" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Operating income </link:label>
<link:label id="lab_us-gaap_OperatingIncomeLoss_859503073FA414C1C5A216F523607362_label_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_859503073FA414C1C5A216F523607362" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Income (Loss) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_859503073FA414C1C5A216F523607362" xlink:type="locator"/>
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<link:label id="lab_it_InterestExpenseandOtherNonoperatingIncome_94F25F9E5BC21B06895716F523619C6E_terseLabel_en-US" xlink:label="lab_it_InterestExpenseandOtherNonoperatingIncome_94F25F9E5BC21B06895716F523619C6E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Interest expense and other, net </link:label>
<link:label id="lab_it_InterestExpenseandOtherNonoperatingIncome_94F25F9E5BC21B06895716F523619C6E_label_en-US" xlink:label="lab_it_InterestExpenseandOtherNonoperatingIncome_94F25F9E5BC21B06895716F523619C6E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Interest Expense and Other Nonoperating Income </link:label>
<link:label id="lab_it_InterestExpenseandOtherNonoperatingIncome_94F25F9E5BC21B06895716F523619C6E_documentation_en-US" xlink:label="lab_it_InterestExpenseandOtherNonoperatingIncome_94F25F9E5BC21B06895716F523619C6E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Interest Expense and Other Nonoperating Income </link:label>
<link:loc xlink:href="it-20190930.xsd#it_InterestExpenseandOtherNonoperatingIncome" xlink:label="loc_it_InterestExpenseandOtherNonoperatingIncome_94F25F9E5BC21B06895716F523619C6E" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_DEDDEEDF584F4AF3C22216F9C7526B81_terseLabel_en-US" xlink:label="lab_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_DEDDEEDF584F4AF3C22216F9C7526B81" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Gain (loss) from divested operations </link:label>
<link:label id="lab_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_DEDDEEDF584F4AF3C22216F9C7526B81_label_en-US" xlink:label="lab_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_DEDDEEDF584F4AF3C22216F9C7526B81" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax" xlink:label="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_DEDDEEDF584F4AF3C22216F9C7526B81" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncomeTaxExpenseBenefit_8B7CEE1509EBBD1CA7CA16F52366AAC4_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxExpenseBenefit_8B7CEE1509EBBD1CA7CA16F52366AAC4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Provision (benefit) for income taxes </link:label>
<link:label id="lab_us-gaap_IncomeTaxExpenseBenefit_8B7CEE1509EBBD1CA7CA16F52366AAC4_label_en-US" xlink:label="lab_us-gaap_IncomeTaxExpenseBenefit_8B7CEE1509EBBD1CA7CA16F52366AAC4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Tax Expense (Benefit) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_8B7CEE1509EBBD1CA7CA16F52366AAC4" xlink:type="locator"/>
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<link:label id="lab_us-gaap_NetIncomeLoss_3FABA952CFDDFE52887216F523665835_totalLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_3FABA952CFDDFE52887216F523665835" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net income </link:label>
<link:label id="lab_us-gaap_NetIncomeLoss_3FABA952CFDDFE52887216F523665835_label_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_3FABA952CFDDFE52887216F523665835" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Income (Loss) Attributable to Parent </link:label>
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<link:label id="lab_it_SegmentReportingInformationPercentofTargetBonusChargesAllocatedtoSegments_9CB7A8E42CC6BF702CA016F52366FA2D_terseLabel_en-US" xlink:label="lab_it_SegmentReportingInformationPercentofTargetBonusChargesAllocatedtoSegments_9CB7A8E42CC6BF702CA016F52366FA2D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Percent of target bonus allocated to segments </link:label>
<link:label id="lab_it_SegmentReportingInformationPercentofTargetBonusChargesAllocatedtoSegments_9CB7A8E42CC6BF702CA016F52366FA2D_label_en-US" xlink:label="lab_it_SegmentReportingInformationPercentofTargetBonusChargesAllocatedtoSegments_9CB7A8E42CC6BF702CA016F52366FA2D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Segment Reporting Information, Percent of Target Bonus Charges Allocated to Segments </link:label>
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<link:loc xlink:href="it-20190930.xsd#it_SegmentReportingInformationPercentofTargetBonusChargesAllocatedtoSegments" xlink:label="loc_it_SegmentReportingInformationPercentofTargetBonusChargesAllocatedtoSegments_9CB7A8E42CC6BF702CA016F52366FA2D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_0BF89A88134734EBBB6604186AA26120_label_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_0BF89A88134734EBBB6604186AA26120" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement [Abstract] </link:label>
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<link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4F5BB764C207E6137B8604186AA2FF60_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4F5BB764C207E6137B8604186AA2FF60" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] </link:label>
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<link:label id="lab_us-gaap_AwardTypeAxis_4606C405ED73B7925B8A04186AA3B261_terseLabel_en-US" xlink:label="lab_us-gaap_AwardTypeAxis_4606C405ED73B7925B8A04186AA3B261" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Award Type [Axis] </link:label>
<link:label id="lab_us-gaap_AwardTypeAxis_4606C405ED73B7925B8A04186AA3B261_label_en-US" xlink:label="lab_us-gaap_AwardTypeAxis_4606C405ED73B7925B8A04186AA3B261" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Award Type [Axis] </link:label>
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<link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_82856DE522EC9143D16904186AA3CF6E_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_82856DE522EC9143D16904186AA3CF6E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Award Type [Domain] </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_82856DE522EC9143D16904186AA3CF6E_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_82856DE522EC9143D16904186AA3CF6E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Award Type [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_82856DE522EC9143D16904186AA3CF6E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_82856DE522EC9143D16904186AA3CF6E" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_82856DE522EC9143D16904186AA3CF6E" xlink:type="arc"/>
<link:label id="lab_us-gaap_StockAppreciationRightsSARSMember_9D25FC1792167B5E71F104186AA38B06_terseLabel_en-US" xlink:label="lab_us-gaap_StockAppreciationRightsSARSMember_9D25FC1792167B5E71F104186AA38B06" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock appreciation rights </link:label>
<link:label id="lab_us-gaap_StockAppreciationRightsSARSMember_9D25FC1792167B5E71F104186AA38B06_label_en-US" xlink:label="lab_us-gaap_StockAppreciationRightsSARSMember_9D25FC1792167B5E71F104186AA38B06" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stock Appreciation Rights (SARs) [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockAppreciationRightsSARSMember" xlink:label="loc_us-gaap_StockAppreciationRightsSARSMember_9D25FC1792167B5E71F104186AA38B06" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockAppreciationRightsSARSMember_9D25FC1792167B5E71F104186AA38B06" xlink:to="lab_us-gaap_StockAppreciationRightsSARSMember_9D25FC1792167B5E71F104186AA38B06" xlink:type="arc"/>
<link:label id="lab_us-gaap_RestrictedStockUnitsRSUMember_04C8D7E897C7E98CC3A904186AA4DEA8_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedStockUnitsRSUMember_04C8D7E897C7E98CC3A904186AA4DEA8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Restricted stock units </link:label>
<link:label id="lab_us-gaap_RestrictedStockUnitsRSUMember_04C8D7E897C7E98CC3A904186AA4DEA8_label_en-US" xlink:label="lab_us-gaap_RestrictedStockUnitsRSUMember_04C8D7E897C7E98CC3A904186AA4DEA8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restricted Stock Units (RSUs) [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_04C8D7E897C7E98CC3A904186AA4DEA8" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestrictedStockUnitsRSUMember_04C8D7E897C7E98CC3A904186AA4DEA8" xlink:to="lab_us-gaap_RestrictedStockUnitsRSUMember_04C8D7E897C7E98CC3A904186AA4DEA8" xlink:type="arc"/>
<link:label id="lab_it_CommonStockEquivalentsMember_93A33F9472C76F8E13E704186AA42407_terseLabel_en-US" xlink:label="lab_it_CommonStockEquivalentsMember_93A33F9472C76F8E13E704186AA42407" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Common stock equivalents </link:label>
<link:label id="lab_it_CommonStockEquivalentsMember_93A33F9472C76F8E13E704186AA42407_label_en-US" xlink:label="lab_it_CommonStockEquivalentsMember_93A33F9472C76F8E13E704186AA42407" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock Equivalents [Member] </link:label>
<link:label id="lab_it_CommonStockEquivalentsMember_93A33F9472C76F8E13E704186AA42407_documentation_en-US" xlink:label="lab_it_CommonStockEquivalentsMember_93A33F9472C76F8E13E704186AA42407" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> -- None. No documentation exists for this element. -- </link:label>
<link:loc xlink:href="it-20190930.xsd#it_CommonStockEquivalentsMember" xlink:label="loc_it_CommonStockEquivalentsMember_93A33F9472C76F8E13E704186AA42407" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_CommonStockEquivalentsMember_93A33F9472C76F8E13E704186AA42407" xlink:to="lab_it_CommonStockEquivalentsMember_93A33F9472C76F8E13E704186AA42407" xlink:type="arc"/>
<link:label id="lab_it_RetirementEligibleEmployeesEquityAwardMember_15051C55513E89D6737A04186AA44851_terseLabel_en-US" xlink:label="lab_it_RetirementEligibleEmployeesEquityAwardMember_15051C55513E89D6737A04186AA44851" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Retirement eligible employees equity award </link:label>
<link:label id="lab_it_RetirementEligibleEmployeesEquityAwardMember_15051C55513E89D6737A04186AA44851_label_en-US" xlink:label="lab_it_RetirementEligibleEmployeesEquityAwardMember_15051C55513E89D6737A04186AA44851" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Retirement Eligible Employees Equity Award [Member] </link:label>
<link:label id="lab_it_RetirementEligibleEmployeesEquityAwardMember_15051C55513E89D6737A04186AA44851_documentation_en-US" xlink:label="lab_it_RetirementEligibleEmployeesEquityAwardMember_15051C55513E89D6737A04186AA44851" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> -- None. No documentation exists for this element. -- </link:label>
<link:loc xlink:href="it-20190930.xsd#it_RetirementEligibleEmployeesEquityAwardMember" xlink:label="loc_it_RetirementEligibleEmployeesEquityAwardMember_15051C55513E89D6737A04186AA44851" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_RetirementEligibleEmployeesEquityAwardMember_15051C55513E89D6737A04186AA44851" xlink:to="lab_it_RetirementEligibleEmployeesEquityAwardMember_15051C55513E89D6737A04186AA44851" xlink:type="arc"/>
<link:label id="lab_us-gaap_IncomeStatementLocationAxis_C4514BF2905130A38B0904186AA481F8_verboseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationAxis_C4514BF2905130A38B0904186AA481F8" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] </link:label>
<link:label id="lab_us-gaap_IncomeStatementLocationAxis_C4514BF2905130A38B0904186AA481F8_label_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationAxis_C4514BF2905130A38B0904186AA481F8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Statement Location [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_C4514BF2905130A38B0904186AA481F8" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_C4514BF2905130A38B0904186AA481F8" xlink:to="lab_us-gaap_IncomeStatementLocationAxis_C4514BF2905130A38B0904186AA481F8" xlink:type="arc"/>
<link:label id="lab_us-gaap_IncomeStatementLocationDomain_CED72D3C3AAF3E65DFFA04186AA50806_verboseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationDomain_CED72D3C3AAF3E65DFFA04186AA50806" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] </link:label>
<link:label id="lab_us-gaap_IncomeStatementLocationDomain_CED72D3C3AAF3E65DFFA04186AA50806_label_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationDomain_CED72D3C3AAF3E65DFFA04186AA50806" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Income Statement Location [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_CED72D3C3AAF3E65DFFA04186AA50806" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_CED72D3C3AAF3E65DFFA04186AA50806" xlink:to="lab_us-gaap_IncomeStatementLocationDomain_CED72D3C3AAF3E65DFFA04186AA50806" xlink:type="arc"/>
<link:label id="lab_us-gaap_CostOfSalesMember_3956C10F8D77DB53570504186AAC541E_terseLabel_en-US" xlink:label="lab_us-gaap_CostOfSalesMember_3956C10F8D77DB53570504186AAC541E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cost of services and product development </link:label>
<link:label id="lab_us-gaap_CostOfSalesMember_3956C10F8D77DB53570504186AAC541E_label_en-US" xlink:label="lab_us-gaap_CostOfSalesMember_3956C10F8D77DB53570504186AAC541E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cost of Sales [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostOfSalesMember" xlink:label="loc_us-gaap_CostOfSalesMember_3956C10F8D77DB53570504186AAC541E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CostOfSalesMember_3956C10F8D77DB53570504186AAC541E" xlink:to="lab_us-gaap_CostOfSalesMember_3956C10F8D77DB53570504186AAC541E" xlink:type="arc"/>
<link:label id="lab_us-gaap_SellingGeneralAndAdministrativeExpensesMember_7050A9FF29B494B5584B04186AAC323F_terseLabel_en-US" xlink:label="lab_us-gaap_SellingGeneralAndAdministrativeExpensesMember_7050A9FF29B494B5584B04186AAC323F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Selling, general and administrative </link:label>
<link:label id="lab_us-gaap_SellingGeneralAndAdministrativeExpensesMember_7050A9FF29B494B5584B04186AAC323F_label_en-US" xlink:label="lab_us-gaap_SellingGeneralAndAdministrativeExpensesMember_7050A9FF29B494B5584B04186AAC323F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Selling, General and Administrative Expenses [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_7050A9FF29B494B5584B04186AAC323F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_7050A9FF29B494B5584B04186AAC323F" xlink:to="lab_us-gaap_SellingGeneralAndAdministrativeExpensesMember_7050A9FF29B494B5584B04186AAC323F" xlink:type="arc"/>
<link:label id="lab_us-gaap_AcquisitionRelatedCostsMember_62C18226182C8D50745204186AAD95CC_terseLabel_en-US" xlink:label="lab_us-gaap_AcquisitionRelatedCostsMember_62C18226182C8D50745204186AAD95CC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Acquisition and integration charges </link:label>
<link:label id="lab_us-gaap_AcquisitionRelatedCostsMember_62C18226182C8D50745204186AAD95CC_label_en-US" xlink:label="lab_us-gaap_AcquisitionRelatedCostsMember_62C18226182C8D50745204186AAD95CC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Acquisition-related Costs [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AcquisitionRelatedCostsMember" xlink:label="loc_us-gaap_AcquisitionRelatedCostsMember_62C18226182C8D50745204186AAD95CC" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AcquisitionRelatedCostsMember_62C18226182C8D50745204186AAD95CC" xlink:to="lab_us-gaap_AcquisitionRelatedCostsMember_62C18226182C8D50745204186AAD95CC" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C8576C0903DD24BBF28604186AAD19E4_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C8576C0903DD24BBF28604186AAD19E4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award [Line Items] </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C8576C0903DD24BBF28604186AAD19E4_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C8576C0903DD24BBF28604186AAD19E4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C8576C0903DD24BBF28604186AAD19E4" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C8576C0903DD24BBF28604186AAD19E4" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C8576C0903DD24BBF28604186AAD19E4" xlink:type="arc"/>
<link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpense_FE7BC71CB25C6701567C04186AAD1428_terseLabel_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpense_FE7BC71CB25C6701567C04186AAD1428" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Total stock-based compensation expense (credit) </link:label>
<link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpense_FE7BC71CB25C6701567C04186AAD1428_label_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpense_FE7BC71CB25C6701567C04186AAD1428" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement, Expense </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_FE7BC71CB25C6701567C04186AAD1428" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AllocatedShareBasedCompensationExpense_FE7BC71CB25C6701567C04186AAD1428" xlink:to="lab_us-gaap_AllocatedShareBasedCompensationExpense_FE7BC71CB25C6701567C04186AAD1428" xlink:type="arc"/>
<link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_D116753D4FFB58F8D938B8A6BA3C3D71_terseLabel_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_5D2E678CFA035B169DF1AD95A26538E7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock-Based Compensation </link:label>
<link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_D116753D4FFB58F8D938B8A6BA3C3D71_label_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_5D2E678CFA035B169DF1AD95A26538E7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement [Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_5D2E678CFA035B169DF1AD95A26538E7" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_5D2E678CFA035B169DF1AD95A26538E7" xlink:to="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_5D2E678CFA035B169DF1AD95A26538E7" xlink:type="arc"/>
<link:label id="lab_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_4E06841C9DB0AD4489CFEAF67F363C6A_label_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_5EFF70C3B8595FCBA4D3111D18DFB172" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Derivative Instruments and Hedging Activities Disclosure [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_5EFF70C3B8595FCBA4D3111D18DFB172" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_A8E5209EBF67725E89B0EAF67F369249_label_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_14C218BE701A55FB96F56B4045CA5994" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Derivative Instruments, Gain (Loss) [Table] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_14C218BE701A55FB96F56B4045CA5994" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncomeStatementLocationAxis_F19A21B9CC74DAC991A8EAF67F363D6A_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationAxis_20F4556A9A5A5743AA8BD2F5C4A3CD88" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Income Statement Location [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_20F4556A9A5A5743AA8BD2F5C4A3CD88" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncomeStatementLocationDomain_B0FEF6EF5AE7BC926B37EAF67F369F9D_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationDomain_85E3D9F3FB4B5D4A86635D1F23D00848" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Income Statement Location [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_85E3D9F3FB4B5D4A86635D1F23D00848" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_85E3D9F3FB4B5D4A86635D1F23D00848" xlink:to="lab_us-gaap_IncomeStatementLocationDomain_85E3D9F3FB4B5D4A86635D1F23D00848" xlink:type="arc"/>
<link:label id="lab_it_InterestIncomeExpenseMember_0DA67281467AF961FF79EAF67F37E547_terseLabel_en-US" xlink:label="lab_it_InterestIncomeExpenseMember_3B12BB2D2A4F5BACB61370511E19BD7D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Interest (income) expense, net </link:label>
<link:label id="lab_it_InterestIncomeExpenseMember_0DA67281467AF961FF79EAF67F37E547_label_en-US" xlink:label="lab_it_InterestIncomeExpenseMember_3B12BB2D2A4F5BACB61370511E19BD7D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Interest Income (Expense) [Member] </link:label>
<link:label id="lab_it_InterestIncomeExpenseMember_0DA67281467AF961FF79EAF67F37E547_documentation_en-US" xlink:label="lab_it_InterestIncomeExpenseMember_3B12BB2D2A4F5BACB61370511E19BD7D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Interest Income (Expense) [Member] </link:label>
<link:loc xlink:href="it-20190930.xsd#it_InterestIncomeExpenseMember" xlink:label="loc_it_InterestIncomeExpenseMember_3B12BB2D2A4F5BACB61370511E19BD7D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_InterestIncomeExpenseMember_3B12BB2D2A4F5BACB61370511E19BD7D" xlink:to="lab_it_InterestIncomeExpenseMember_3B12BB2D2A4F5BACB61370511E19BD7D" xlink:type="arc"/>
<link:label id="lab_it_OtherGainLossNetMember_5FAA1DB61A234122C287EAF67F378740_terseLabel_en-US" xlink:label="lab_it_OtherGainLossNetMember_47A622C5109250F5A11ECAC12499D9F5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other expense (income), net </link:label>
<link:label id="lab_it_OtherGainLossNetMember_5FAA1DB61A234122C287EAF67F378740_label_en-US" xlink:label="lab_it_OtherGainLossNetMember_47A622C5109250F5A11ECAC12499D9F5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Gain (Loss), Net [Member] </link:label>
<link:label id="lab_it_OtherGainLossNetMember_5FAA1DB61A234122C287EAF67F378740_documentation_en-US" xlink:label="lab_it_OtherGainLossNetMember_47A622C5109250F5A11ECAC12499D9F5" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Other Gain (Loss), Net </link:label>
<link:loc xlink:href="it-20190930.xsd#it_OtherGainLossNetMember" xlink:label="loc_it_OtherGainLossNetMember_47A622C5109250F5A11ECAC12499D9F5" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DerivativeInstrumentsGainLossLineItems_93290074EF29329CF04AEAF67F370B2F_label_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentsGainLossLineItems_404D43F18409558B878860908ACDDC8A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Derivative Instruments, Gain (Loss) [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_404D43F18409558B878860908ACDDC8A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_404D43F18409558B878860908ACDDC8A" xlink:to="lab_us-gaap_DerivativeInstrumentsGainLossLineItems_404D43F18409558B878860908ACDDC8A" xlink:type="arc"/>
<link:label id="lab_us-gaap_DerivativeGainLossOnDerivativeNet_ED80798CA2C2D5D8AE76EAF67F379158_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_DerivativeGainLossOnDerivativeNet_8B2E6EFAE69858C5A590A718B7A085A3" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Total expense (income), net </link:label>
<link:label id="lab_us-gaap_DerivativeGainLossOnDerivativeNet_ED80798CA2C2D5D8AE76EAF67F379158_label_en-US" xlink:label="lab_us-gaap_DerivativeGainLossOnDerivativeNet_8B2E6EFAE69858C5A590A718B7A085A3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Derivative, Gain (Loss) on Derivative, Net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeGainLossOnDerivativeNet" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_8B2E6EFAE69858C5A590A718B7A085A3" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StatementOfFinancialPositionAbstract_F0B5B0C426D4B6A2AAB8FE36860D852B_label_en-US" xlink:label="lab_us-gaap_StatementOfFinancialPositionAbstract_F0B5B0C426D4B6A2AAB8FE36860D852B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement of Financial Position [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="loc_us-gaap_StatementOfFinancialPositionAbstract_F0B5B0C426D4B6A2AAB8FE36860D852B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AssetsAbstract_0A60F6ABCBF009C5E415FE36860DDA71_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsAbstract_0A60F6ABCBF009C5E415FE36860DDA71" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Assets </link:label>
<link:label id="lab_us-gaap_AssetsAbstract_0A60F6ABCBF009C5E415FE36860DDA71_label_en-US" xlink:label="lab_us-gaap_AssetsAbstract_0A60F6ABCBF009C5E415FE36860DDA71" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_0A60F6ABCBF009C5E415FE36860DDA71" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsAbstract_0A60F6ABCBF009C5E415FE36860DDA71" xlink:to="lab_us-gaap_AssetsAbstract_0A60F6ABCBF009C5E415FE36860DDA71" xlink:type="arc"/>
<link:label id="lab_us-gaap_AssetsCurrentAbstract_2951166702C654E9625FFE36860D8D06_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrentAbstract_2951166702C654E9625FFE36860D8D06" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Current assets: </link:label>
<link:label id="lab_us-gaap_AssetsCurrentAbstract_2951166702C654E9625FFE36860D8D06_label_en-US" xlink:label="lab_us-gaap_AssetsCurrentAbstract_2951166702C654E9625FFE36860D8D06" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets, Current [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_us-gaap_AssetsCurrentAbstract_2951166702C654E9625FFE36860D8D06" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsCurrentAbstract_2951166702C654E9625FFE36860D8D06" xlink:to="lab_us-gaap_AssetsCurrentAbstract_2951166702C654E9625FFE36860D8D06" xlink:type="arc"/>
<link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_E63361D133DB7EC60E7EFE36860EB6A8_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_E63361D133DB7EC60E7EFE36860EB6A8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash and cash equivalents </link:label>
<link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_E63361D133DB7EC60E7EFE36860EB6A8_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_E63361D133DB7EC60E7EFE36860EB6A8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cash and Cash Equivalents, at Carrying Value </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_E63361D133DB7EC60E7EFE36860EB6A8" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_E63361D133DB7EC60E7EFE36860EB6A8" xlink:to="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_E63361D133DB7EC60E7EFE36860EB6A8" xlink:type="arc"/>
<link:label id="lab_us-gaap_AccountsReceivableNetCurrent_EE9714177FAD5A43AAB4FE36860E490D_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_EE9714177FAD5A43AAB4FE36860E490D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fees receivable, net of allowances of $7,800 and $7,700, respectively </link:label>
<link:label id="lab_us-gaap_AccountsReceivableNetCurrent_EE9714177FAD5A43AAB4FE36860E490D_label_en-US" xlink:label="lab_us-gaap_AccountsReceivableNetCurrent_EE9714177FAD5A43AAB4FE36860E490D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Receivable, after Allowance for Credit Loss, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_EE9714177FAD5A43AAB4FE36860E490D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherDeferredCostsNet_FFA26F92D947F0F7243AFE36860EB562_terseLabel_en-US" xlink:label="lab_us-gaap_OtherDeferredCostsNet_FFA26F92D947F0F7243AFE36860EB562" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred commissions </link:label>
<link:label id="lab_us-gaap_OtherDeferredCostsNet_FFA26F92D947F0F7243AFE36860EB562_label_en-US" xlink:label="lab_us-gaap_OtherDeferredCostsNet_FFA26F92D947F0F7243AFE36860EB562" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Deferred Costs, Net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherDeferredCostsNet" xlink:label="loc_us-gaap_OtherDeferredCostsNet_FFA26F92D947F0F7243AFE36860EB562" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_C9A9273DD722AF821EB2FE36860E71E6_terseLabel_en-US" xlink:label="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_C9A9273DD722AF821EB2FE36860E71E6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Prepaid expenses and other current assets </link:label>
<link:label id="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_C9A9273DD722AF821EB2FE36860E71E6_label_en-US" xlink:label="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_C9A9273DD722AF821EB2FE36860E71E6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Prepaid Expense and Other Assets, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_C9A9273DD722AF821EB2FE36860E71E6" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AssetsCurrent_1F24619561A7C81318B3FE36860F99A8_totalLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrent_1F24619561A7C81318B3FE36860F99A8" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total current assets </link:label>
<link:label id="lab_us-gaap_AssetsCurrent_1F24619561A7C81318B3FE36860F99A8_label_en-US" xlink:label="lab_us-gaap_AssetsCurrent_1F24619561A7C81318B3FE36860F99A8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_1F24619561A7C81318B3FE36860F99A8" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_C3E151536898AF4EF93CFE36860F038C_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_C3E151536898AF4EF93CFE36860F038C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Property, equipment and leasehold improvements, net </link:label>
<link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_C3E151536898AF4EF93CFE36860F038C_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_C3E151536898AF4EF93CFE36860F038C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Property, Plant and Equipment, Net </link:label>
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<link:label id="lab_us-gaap_OperatingLeaseRightOfUseAsset_5D85608EC9A848D715A4FE36860F2C95_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseRightOfUseAsset_5D85608EC9A848D715A4FE36860F2C95" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating leases - right-of-use assets </link:label>
<link:label id="lab_us-gaap_OperatingLeaseRightOfUseAsset_5D85608EC9A848D715A4FE36860F2C95_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseRightOfUseAsset_5D85608EC9A848D715A4FE36860F2C95" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Right-of-Use Asset </link:label>
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<link:label id="lab_us-gaap_Goodwill_4707E31F86A9DE8E2B20FE36860FDC5D_terseLabel_en-US" xlink:label="lab_us-gaap_Goodwill_4707E31F86A9DE8E2B20FE36860FDC5D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Goodwill </link:label>
<link:label id="lab_us-gaap_Goodwill_4707E31F86A9DE8E2B20FE36860FDC5D_label_en-US" xlink:label="lab_us-gaap_Goodwill_4707E31F86A9DE8E2B20FE36860FDC5D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Goodwill </link:label>
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<link:label id="lab_us-gaap_OtherAssetsNoncurrent_A88F44BA4D1279AD34E7FE36861010FF_label_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_A88F44BA4D1279AD34E7FE36861010FF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Assets, Noncurrent </link:label>
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<link:label id="lab_us-gaap_Assets_DBBFFC4A1404793244F8FE36861076BC_label_en-US" xlink:label="lab_us-gaap_Assets_DBBFFC4A1404793244F8FE36861076BC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets </link:label>
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<link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_030E50047FC22E94116FFE3686106A0D_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_030E50047FC22E94116FFE3686106A0D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Liabilities and Stockholders’ Equity </link:label>
<link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_030E50047FC22E94116FFE3686106A0D_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_030E50047FC22E94116FFE3686106A0D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities and Equity [Abstract] </link:label>
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<link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_02351D4973A6BE0CCC5DFE3686119EA6_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_02351D4973A6BE0CCC5DFE3686119EA6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Current liabilities: </link:label>
<link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_02351D4973A6BE0CCC5DFE3686119EA6_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_02351D4973A6BE0CCC5DFE3686119EA6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities, Current [Abstract] </link:label>
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<link:label id="lab_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_348863C7DB0A4B218EBFFE36861155F8_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_348863C7DB0A4B218EBFFE36861155F8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accounts payable and accrued liabilities </link:label>
<link:label id="lab_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_348863C7DB0A4B218EBFFE36861155F8_label_en-US" xlink:label="lab_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_348863C7DB0A4B218EBFFE36861155F8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Payable and Accrued Liabilities, Current </link:label>
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<link:label id="lab_us-gaap_ContractWithCustomerLiabilityCurrent_91CA0B089147E0C2F3CAFE368611D3C3_verboseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiabilityCurrent_91CA0B089147E0C2F3CAFE368611D3C3" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Deferred revenues </link:label>
<link:label id="lab_us-gaap_ContractWithCustomerLiabilityCurrent_91CA0B089147E0C2F3CAFE368611D3C3_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiabilityCurrent_91CA0B089147E0C2F3CAFE368611D3C3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Contract with Customer, Liability, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_91CA0B089147E0C2F3CAFE368611D3C3" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LongTermDebtCurrent_F873C2336EBCFBE54414FE368611494A_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtCurrent_F873C2336EBCFBE54414FE368611494A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Current portion of long-term debt </link:label>
<link:label id="lab_us-gaap_LongTermDebtCurrent_F873C2336EBCFBE54414FE368611494A_label_en-US" xlink:label="lab_us-gaap_LongTermDebtCurrent_F873C2336EBCFBE54414FE368611494A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long-term Debt, Current Maturities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="loc_us-gaap_LongTermDebtCurrent_F873C2336EBCFBE54414FE368611494A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LiabilitiesCurrent_B12EE9715B7422233218FE3686126882_totalLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrent_B12EE9715B7422233218FE3686126882" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total current liabilities </link:label>
<link:label id="lab_us-gaap_LiabilitiesCurrent_B12EE9715B7422233218FE3686126882_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrent_B12EE9715B7422233218FE3686126882" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_B12EE9715B7422233218FE3686126882" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LongTermDebtNoncurrent_78A31595A5315761AF09FE3686129336_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtNoncurrent_78A31595A5315761AF09FE3686129336" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Long-term debt, net of deferred financing fees </link:label>
<link:label id="lab_us-gaap_LongTermDebtNoncurrent_78A31595A5315761AF09FE3686129336_label_en-US" xlink:label="lab_us-gaap_LongTermDebtNoncurrent_78A31595A5315761AF09FE3686129336" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Long-term Debt, Excluding Current Maturities </link:label>
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<link:label id="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_3AA69E87EE8ADC02E7EBFE368612C646_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_3AA69E87EE8ADC02E7EBFE368612C646" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating leases - liabilities </link:label>
<link:label id="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_3AA69E87EE8ADC02E7EBFE368612C646_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_3AA69E87EE8ADC02E7EBFE368612C646" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Liability, Noncurrent </link:label>
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<link:label id="lab_us-gaap_OtherLiabilitiesNoncurrent_9E1AC49EBD8FC8A6EAF0FE36861216A0_label_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrent_9E1AC49EBD8FC8A6EAF0FE36861216A0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Liabilities, Noncurrent </link:label>
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<link:label id="lab_us-gaap_Liabilities_C5CF857FD9D50D0F2FE4FE368613C829_totalLabel_en-US" xlink:label="lab_us-gaap_Liabilities_C5CF857FD9D50D0F2FE4FE368613C829" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total Liabilities </link:label>
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<link:label id="lab_us-gaap_StockholdersEquityAbstract_2B831EF334EA8F87613AFE368613DDF0_terseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityAbstract_2B831EF334EA8F87613AFE368613DDF0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stockholders’ Equity </link:label>
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<link:label id="lab_srt_SegmentGeographicalDomain_8678637D7964705CE328B8A6BB74DCAF_label_en-US" xlink:label="lab_srt_SegmentGeographicalDomain_272E7932AD425DA6AFA801A4C651A783" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Geographical [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_272E7932AD425DA6AFA801A4C651A783" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_SegmentGeographicalDomain_272E7932AD425DA6AFA801A4C651A783" xlink:to="lab_srt_SegmentGeographicalDomain_272E7932AD425DA6AFA801A4C651A783" xlink:type="arc"/>
<link:label id="lab_it_UnitedStatesAndCanadaMember_3A346BB5A238B4499492B8A6BB75E3F6_terseLabel_en-US" xlink:label="lab_it_UnitedStatesAndCanadaMember_6EBBAFC8683D55FFA54B4D96057E84EA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> United States and Canada </link:label>
<link:label id="lab_it_UnitedStatesAndCanadaMember_3A346BB5A238B4499492B8A6BB75E3F6_label_en-US" xlink:label="lab_it_UnitedStatesAndCanadaMember_6EBBAFC8683D55FFA54B4D96057E84EA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> United States And Canada [Member] </link:label>
<link:label id="lab_it_UnitedStatesAndCanadaMember_3A346BB5A238B4499492B8A6BB75E3F6_documentation_en-US" xlink:label="lab_it_UnitedStatesAndCanadaMember_6EBBAFC8683D55FFA54B4D96057E84EA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> -- None. No documentation exists for this element. -- </link:label>
<link:loc xlink:href="it-20190930.xsd#it_UnitedStatesAndCanadaMember" xlink:label="loc_it_UnitedStatesAndCanadaMember_6EBBAFC8683D55FFA54B4D96057E84EA" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_UnitedStatesAndCanadaMember_6EBBAFC8683D55FFA54B4D96057E84EA" xlink:to="lab_it_UnitedStatesAndCanadaMember_6EBBAFC8683D55FFA54B4D96057E84EA" xlink:type="arc"/>
<link:label id="lab_it_EuropeMiddleEastAfricaMember_3B7F9F15CE494F5429ADB8A6BB759E59_terseLabel_en-US" xlink:label="lab_it_EuropeMiddleEastAfricaMember_BCBBB65DFC7359F38EA5DBBEC0ACF4F9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Europe, Middle East and Africa </link:label>
<link:label id="lab_it_EuropeMiddleEastAfricaMember_3B7F9F15CE494F5429ADB8A6BB759E59_label_en-US" xlink:label="lab_it_EuropeMiddleEastAfricaMember_BCBBB65DFC7359F38EA5DBBEC0ACF4F9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Europe Middle East Africa [Member] </link:label>
<link:label id="lab_it_EuropeMiddleEastAfricaMember_3B7F9F15CE494F5429ADB8A6BB759E59_documentation_en-US" xlink:label="lab_it_EuropeMiddleEastAfricaMember_BCBBB65DFC7359F38EA5DBBEC0ACF4F9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> -- None. No documentation exists for this element. -- </link:label>
<link:loc xlink:href="it-20190930.xsd#it_EuropeMiddleEastAfricaMember" xlink:label="loc_it_EuropeMiddleEastAfricaMember_BCBBB65DFC7359F38EA5DBBEC0ACF4F9" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_EuropeMiddleEastAfricaMember_BCBBB65DFC7359F38EA5DBBEC0ACF4F9" xlink:to="lab_it_EuropeMiddleEastAfricaMember_BCBBB65DFC7359F38EA5DBBEC0ACF4F9" xlink:type="arc"/>
<link:label id="lab_it_OtherInternationalMember_26BC61823691D8978642B8A6BB754FE0_terseLabel_en-US" xlink:label="lab_it_OtherInternationalMember_9DCA627E16A2539A8141822CD1922E72" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other International </link:label>
<link:label id="lab_it_OtherInternationalMember_26BC61823691D8978642B8A6BB754FE0_label_en-US" xlink:label="lab_it_OtherInternationalMember_9DCA627E16A2539A8141822CD1922E72" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other International [Member] </link:label>
<link:label id="lab_it_OtherInternationalMember_26BC61823691D8978642B8A6BB754FE0_documentation_en-US" xlink:label="lab_it_OtherInternationalMember_9DCA627E16A2539A8141822CD1922E72" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> -- None. No documentation exists for this element. -- </link:label>
<link:loc xlink:href="it-20190930.xsd#it_OtherInternationalMember" xlink:label="loc_it_OtherInternationalMember_9DCA627E16A2539A8141822CD1922E72" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_OtherInternationalMember_9DCA627E16A2539A8141822CD1922E72" xlink:to="lab_it_OtherInternationalMember_9DCA627E16A2539A8141822CD1922E72" xlink:type="arc"/>
<link:label id="lab_us-gaap_StatementBusinessSegmentsAxis_57718DF138F2FB83D86BB8A6BB76BDA1_terseLabel_en-US" xlink:label="lab_us-gaap_StatementBusinessSegmentsAxis_2D00223CB4B25E189505F77736495371" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Segments [Axis] </link:label>
<link:label id="lab_us-gaap_StatementBusinessSegmentsAxis_57718DF138F2FB83D86BB8A6BB76BDA1_label_en-US" xlink:label="lab_us-gaap_StatementBusinessSegmentsAxis_2D00223CB4B25E189505F77736495371" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Segments [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_2D00223CB4B25E189505F77736495371" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_2D00223CB4B25E189505F77736495371" xlink:to="lab_us-gaap_StatementBusinessSegmentsAxis_2D00223CB4B25E189505F77736495371" xlink:type="arc"/>
<link:label id="lab_us-gaap_SegmentDomain_C6475CCAA207DCDAD216B8A6BB767C7E_terseLabel_en-US" xlink:label="lab_us-gaap_SegmentDomain_2A20C9655F8652FDB85838500AA99792" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Segments [Domain] </link:label>
<link:label id="lab_us-gaap_SegmentDomain_C6475CCAA207DCDAD216B8A6BB767C7E_label_en-US" xlink:label="lab_us-gaap_SegmentDomain_2A20C9655F8652FDB85838500AA99792" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Segments [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_2A20C9655F8652FDB85838500AA99792" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SegmentDomain_2A20C9655F8652FDB85838500AA99792" xlink:to="lab_us-gaap_SegmentDomain_2A20C9655F8652FDB85838500AA99792" xlink:type="arc"/>
<link:label id="lab_it_ResearchSegmentMember_58C588D4BFB76048A9C0B8A6BB762FF5_terseLabel_en-US" xlink:label="lab_it_ResearchSegmentMember_4E4EA704739D58E5A5DC9FAC06F2C19E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Research </link:label>
<link:label id="lab_it_ResearchSegmentMember_58C588D4BFB76048A9C0B8A6BB762FF5_label_en-US" xlink:label="lab_it_ResearchSegmentMember_4E4EA704739D58E5A5DC9FAC06F2C19E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Research Segment [Member] </link:label>
<link:label id="lab_it_ResearchSegmentMember_58C588D4BFB76048A9C0B8A6BB762FF5_documentation_en-US" xlink:label="lab_it_ResearchSegmentMember_4E4EA704739D58E5A5DC9FAC06F2C19E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> -- None. No documentation exists for this element. -- </link:label>
<link:loc xlink:href="it-20190930.xsd#it_ResearchSegmentMember" xlink:label="loc_it_ResearchSegmentMember_4E4EA704739D58E5A5DC9FAC06F2C19E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_ResearchSegmentMember_4E4EA704739D58E5A5DC9FAC06F2C19E" xlink:to="lab_it_ResearchSegmentMember_4E4EA704739D58E5A5DC9FAC06F2C19E" xlink:type="arc"/>
<link:label id="lab_it_EventsMember_223E1851353E705EC7FFB8A6BB7601AE_terseLabel_en-US" xlink:label="lab_it_EventsMember_3E79915BCCE65C319AEC55A9CED6CA6E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Conferences </link:label>
<link:label id="lab_it_EventsMember_223E1851353E705EC7FFB8A6BB7601AE_label_en-US" xlink:label="lab_it_EventsMember_3E79915BCCE65C319AEC55A9CED6CA6E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Events [Member] </link:label>
<link:label id="lab_it_EventsMember_223E1851353E705EC7FFB8A6BB7601AE_documentation_en-US" xlink:label="lab_it_EventsMember_3E79915BCCE65C319AEC55A9CED6CA6E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> -- None. No documentation exists for this element. -- </link:label>
<link:loc xlink:href="it-20190930.xsd#it_EventsMember" xlink:label="loc_it_EventsMember_3E79915BCCE65C319AEC55A9CED6CA6E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_EventsMember_3E79915BCCE65C319AEC55A9CED6CA6E" xlink:to="lab_it_EventsMember_3E79915BCCE65C319AEC55A9CED6CA6E" xlink:type="arc"/>
<link:label id="lab_it_ConsultingMember_89316036A17FD1F46A87B8A6BB772DCA_terseLabel_en-US" xlink:label="lab_it_ConsultingMember_ACD39B7F15C153B293CB3393BA24E768" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Consulting </link:label>
<link:label id="lab_it_ConsultingMember_89316036A17FD1F46A87B8A6BB772DCA_label_en-US" xlink:label="lab_it_ConsultingMember_ACD39B7F15C153B293CB3393BA24E768" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Consulting [Member] </link:label>
<link:label id="lab_it_ConsultingMember_89316036A17FD1F46A87B8A6BB772DCA_documentation_en-US" xlink:label="lab_it_ConsultingMember_ACD39B7F15C153B293CB3393BA24E768" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> -- None. No documentation exists for this element. -- </link:label>
<link:loc xlink:href="it-20190930.xsd#it_ConsultingMember" xlink:label="loc_it_ConsultingMember_ACD39B7F15C153B293CB3393BA24E768" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_ConsultingMember_ACD39B7F15C153B293CB3393BA24E768" xlink:to="lab_it_ConsultingMember_ACD39B7F15C153B293CB3393BA24E768" xlink:type="arc"/>
<link:label id="lab_it_OtherRevenueMember_EA9E854B30657B96A334B8A6BB777A38_terseLabel_en-US" xlink:label="lab_it_OtherRevenueMember_49F7330FFC86544AAD19C032E31AD550" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other </link:label>
<link:label id="lab_it_OtherRevenueMember_EA9E854B30657B96A334B8A6BB777A38_label_en-US" xlink:label="lab_it_OtherRevenueMember_49F7330FFC86544AAD19C032E31AD550" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Revenue [Member] </link:label>
<link:label id="lab_it_OtherRevenueMember_EA9E854B30657B96A334B8A6BB777A38_documentation_en-US" xlink:label="lab_it_OtherRevenueMember_49F7330FFC86544AAD19C032E31AD550" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Other Revenue </link:label>
<link:loc xlink:href="it-20190930.xsd#it_OtherRevenueMember" xlink:label="loc_it_OtherRevenueMember_49F7330FFC86544AAD19C032E31AD550" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_OtherRevenueMember_49F7330FFC86544AAD19C032E31AD550" xlink:to="lab_it_OtherRevenueMember_49F7330FFC86544AAD19C032E31AD550" xlink:type="arc"/>
<link:label id="lab_us-gaap_DisaggregationOfRevenueLineItems_E8CE4901DB13AA4002EBB8A6BB771B52_terseLabel_en-US" xlink:label="lab_us-gaap_DisaggregationOfRevenueLineItems_ADADEF225C765A53B9FDADC8077F4352" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Disaggregation of Revenue [Line Items] </link:label>
<link:label id="lab_us-gaap_DisaggregationOfRevenueLineItems_E8CE4901DB13AA4002EBB8A6BB771B52_label_en-US" xlink:label="lab_us-gaap_DisaggregationOfRevenueLineItems_ADADEF225C765A53B9FDADC8077F4352" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Disaggregation of Revenue [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_ADADEF225C765A53B9FDADC8077F4352" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_ADADEF225C765A53B9FDADC8077F4352" xlink:to="lab_us-gaap_DisaggregationOfRevenueLineItems_ADADEF225C765A53B9FDADC8077F4352" xlink:type="arc"/>
<link:label id="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_BA37D54F400FF4C5B092B8A6BB77442E_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_0ECE53030AE45094B4AB21D7DB29D663" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Total revenues </link:label>
<link:label id="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_BA37D54F400FF4C5B092B8A6BB77442E_label_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_0ECE53030AE45094B4AB21D7DB29D663" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revenue from Contract with Customer, Excluding Assessed Tax </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_0ECE53030AE45094B4AB21D7DB29D663" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_0ECE53030AE45094B4AB21D7DB29D663" xlink:to="lab_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_0ECE53030AE45094B4AB21D7DB29D663" xlink:type="arc"/>
<link:label id="lab_us-gaap_PlanNameAxis_7F2CD6A2CD6CA89C1055B8A6BB7DF0A6_terseLabel_en-US" xlink:label="lab_us-gaap_PlanNameAxis_A4208A2839F45A2984D391BD6EA92889" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Plan Name [Axis] </link:label>
<link:label id="lab_us-gaap_PlanNameAxis_7F2CD6A2CD6CA89C1055B8A6BB7DF0A6_label_en-US" xlink:label="lab_us-gaap_PlanNameAxis_A4208A2839F45A2984D391BD6EA92889" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Plan Name [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_A4208A2839F45A2984D391BD6EA92889" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PlanNameAxis_A4208A2839F45A2984D391BD6EA92889" xlink:to="lab_us-gaap_PlanNameAxis_A4208A2839F45A2984D391BD6EA92889" xlink:type="arc"/>
<link:label id="lab_us-gaap_PlanNameDomain_60B7C62B2CC5A50682D8B8A6BB7DD5C1_terseLabel_en-US" xlink:label="lab_us-gaap_PlanNameDomain_B2C3526AC15557048D43311086CB1405" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Plan Name [Domain] </link:label>
<link:label id="lab_us-gaap_PlanNameDomain_60B7C62B2CC5A50682D8B8A6BB7DD5C1_label_en-US" xlink:label="lab_us-gaap_PlanNameDomain_B2C3526AC15557048D43311086CB1405" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Plan Name [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_B2C3526AC15557048D43311086CB1405" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PlanNameDomain_B2C3526AC15557048D43311086CB1405" xlink:to="lab_us-gaap_PlanNameDomain_B2C3526AC15557048D43311086CB1405" xlink:type="arc"/>
<link:label id="lab_it_EmployeeStockPurchasePlanMember_2597A22E22366C7E21F0B8A6BB7EDBDD_terseLabel_en-US" xlink:label="lab_it_EmployeeStockPurchasePlanMember_58357B677E3F563DAACBEB09F85BEEB9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Employee stock purchase plan </link:label>
<link:label id="lab_it_EmployeeStockPurchasePlanMember_2597A22E22366C7E21F0B8A6BB7EDBDD_label_en-US" xlink:label="lab_it_EmployeeStockPurchasePlanMember_58357B677E3F563DAACBEB09F85BEEB9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Employee Stock Purchase Plan [Member] </link:label>
<link:label id="lab_it_EmployeeStockPurchasePlanMember_2597A22E22366C7E21F0B8A6BB7EDBDD_documentation_en-US" xlink:label="lab_it_EmployeeStockPurchasePlanMember_58357B677E3F563DAACBEB09F85BEEB9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> -- None. No documentation exists for this element. -- </link:label>
<link:loc xlink:href="it-20190930.xsd#it_EmployeeStockPurchasePlanMember" xlink:label="loc_it_EmployeeStockPurchasePlanMember_58357B677E3F563DAACBEB09F85BEEB9" xlink:type="locator"/>
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<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_StatementScenarioAxis_E445F1EB419451B10B31461C881C4586" xlink:to="lab_srt_StatementScenarioAxis_E445F1EB419451B10B31461C881C4586" xlink:type="arc"/>
<link:label id="lab_srt_ScenarioUnspecifiedDomain_0F903798505DCBD6FCD1461C881CF579_terseLabel_en-US" xlink:label="lab_srt_ScenarioUnspecifiedDomain_0F903798505DCBD6FCD1461C881CF579" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Scenario [Domain] </link:label>
<link:label id="lab_srt_ScenarioUnspecifiedDomain_0F903798505DCBD6FCD1461C881CF579_label_en-US" xlink:label="lab_srt_ScenarioUnspecifiedDomain_0F903798505DCBD6FCD1461C881CF579" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Scenario [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srt_ScenarioUnspecifiedDomain_0F903798505DCBD6FCD1461C881CF579" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ScenarioUnspecifiedDomain_0F903798505DCBD6FCD1461C881CF579" xlink:to="lab_srt_ScenarioUnspecifiedDomain_0F903798505DCBD6FCD1461C881CF579" xlink:type="arc"/>
<link:label id="lab_srt_ScenarioForecastMember_835813AC1B3CA1E5B610461C881C3E5A_terseLabel_en-US" xlink:label="lab_srt_ScenarioForecastMember_835813AC1B3CA1E5B610461C881C3E5A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Forecast </link:label>
<link:label id="lab_srt_ScenarioForecastMember_835813AC1B3CA1E5B610461C881C3E5A_label_en-US" xlink:label="lab_srt_ScenarioForecastMember_835813AC1B3CA1E5B610461C881C3E5A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Forecast [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ScenarioForecastMember" xlink:label="loc_srt_ScenarioForecastMember_835813AC1B3CA1E5B610461C881C3E5A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ScenarioForecastMember_835813AC1B3CA1E5B610461C881C3E5A" xlink:to="lab_srt_ScenarioForecastMember_835813AC1B3CA1E5B610461C881C3E5A" xlink:type="arc"/>
<link:label id="lab_us-gaap_PerformanceSharesMember_85B29CBE19B49566D634461C881DF20E_terseLabel_en-US" xlink:label="lab_us-gaap_PerformanceSharesMember_85B29CBE19B49566D634461C881DF20E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Performance-based RSUs </link:label>
<link:label id="lab_us-gaap_PerformanceSharesMember_85B29CBE19B49566D634461C881DF20E_label_en-US" xlink:label="lab_us-gaap_PerformanceSharesMember_85B29CBE19B49566D634461C881DF20E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Performance Shares [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PerformanceSharesMember" xlink:label="loc_us-gaap_PerformanceSharesMember_85B29CBE19B49566D634461C881DF20E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PerformanceSharesMember_85B29CBE19B49566D634461C881DF20E" xlink:to="lab_us-gaap_PerformanceSharesMember_85B29CBE19B49566D634461C881DF20E" xlink:type="arc"/>
<link:label id="lab_srt_TitleOfIndividualAxis_ADC071E556B3894B2615461C881DB432_terseLabel_en-US" xlink:label="lab_srt_TitleOfIndividualAxis_ADC071E556B3894B2615461C881DB432" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Title of Individual [Axis] </link:label>
<link:label id="lab_srt_TitleOfIndividualAxis_ADC071E556B3894B2615461C881DB432_label_en-US" xlink:label="lab_srt_TitleOfIndividualAxis_ADC071E556B3894B2615461C881DB432" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Title of Individual [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_TitleOfIndividualAxis" xlink:label="loc_srt_TitleOfIndividualAxis_ADC071E556B3894B2615461C881DB432" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_TitleOfIndividualAxis_ADC071E556B3894B2615461C881DB432" xlink:to="lab_srt_TitleOfIndividualAxis_ADC071E556B3894B2615461C881DB432" xlink:type="arc"/>
<link:label id="lab_srt_TitleOfIndividualWithRelationshipToEntityDomain_2688F7B01BACC6638941461C881DAEC6_terseLabel_en-US" xlink:label="lab_srt_TitleOfIndividualWithRelationshipToEntityDomain_2688F7B01BACC6638941461C881DAEC6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Title of Individual [Domain] </link:label>
<link:label id="lab_srt_TitleOfIndividualWithRelationshipToEntityDomain_2688F7B01BACC6638941461C881DAEC6_label_en-US" xlink:label="lab_srt_TitleOfIndividualWithRelationshipToEntityDomain_2688F7B01BACC6638941461C881DAEC6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Title of Individual [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_2688F7B01BACC6638941461C881DAEC6" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_2688F7B01BACC6638941461C881DAEC6" xlink:to="lab_srt_TitleOfIndividualWithRelationshipToEntityDomain_2688F7B01BACC6638941461C881DAEC6" xlink:type="arc"/>
<link:label id="lab_srt_ExecutiveOfficerMember_CDCCE6B5C8F593EB1B56461C881D1859_terseLabel_en-US" xlink:label="lab_srt_ExecutiveOfficerMember_CDCCE6B5C8F593EB1B56461C881D1859" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Executive officer </link:label>
<link:label id="lab_srt_ExecutiveOfficerMember_CDCCE6B5C8F593EB1B56461C881D1859_label_en-US" xlink:label="lab_srt_ExecutiveOfficerMember_CDCCE6B5C8F593EB1B56461C881D1859" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Executive Officer [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ExecutiveOfficerMember" xlink:label="loc_srt_ExecutiveOfficerMember_CDCCE6B5C8F593EB1B56461C881D1859" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_ExecutiveOfficerMember_CDCCE6B5C8F593EB1B56461C881D1859" xlink:to="lab_srt_ExecutiveOfficerMember_CDCCE6B5C8F593EB1B56461C881D1859" xlink:type="arc"/>
<link:label id="lab_it_NonExecutiveMember_3DC2D141EEB1AD56042A461C881E1601_terseLabel_en-US" xlink:label="lab_it_NonExecutiveMember_3DC2D141EEB1AD56042A461C881E1601" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Non executive </link:label>
<link:label id="lab_it_NonExecutiveMember_3DC2D141EEB1AD56042A461C881E1601_label_en-US" xlink:label="lab_it_NonExecutiveMember_3DC2D141EEB1AD56042A461C881E1601" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Non Executive [Member] </link:label>
<link:label id="lab_it_NonExecutiveMember_3DC2D141EEB1AD56042A461C881E1601_documentation_en-US" xlink:label="lab_it_NonExecutiveMember_3DC2D141EEB1AD56042A461C881E1601" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> -- None. No documentation exists for this element. -- </link:label>
<link:loc xlink:href="it-20190930.xsd#it_NonExecutiveMember" xlink:label="loc_it_NonExecutiveMember_3DC2D141EEB1AD56042A461C881E1601" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_NonExecutiveMember_3DC2D141EEB1AD56042A461C881E1601" xlink:to="lab_it_NonExecutiveMember_3DC2D141EEB1AD56042A461C881E1601" xlink:type="arc"/>
<link:label id="lab_srt_MinimumMember_8702171A547FCB5AABF2461C881EC41C_terseLabel_en-US" xlink:label="lab_srt_MinimumMember_8702171A547FCB5AABF2461C881EC41C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Minimum </link:label>
<link:label id="lab_srt_MinimumMember_8702171A547FCB5AABF2461C881EC41C_label_en-US" xlink:label="lab_srt_MinimumMember_8702171A547FCB5AABF2461C881EC41C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Minimum [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_8702171A547FCB5AABF2461C881EC41C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_srt_MinimumMember_8702171A547FCB5AABF2461C881EC41C" xlink:to="lab_srt_MinimumMember_8702171A547FCB5AABF2461C881EC41C" xlink:type="arc"/>
<link:label id="lab_us-gaap_StatementClassOfStockAxis_588023A9D9C87DDEE6D4461C881F69AF_terseLabel_en-US" xlink:label="lab_us-gaap_StatementClassOfStockAxis_588023A9D9C87DDEE6D4461C881F69AF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Class of Stock [Axis] </link:label>
<link:label id="lab_us-gaap_StatementClassOfStockAxis_588023A9D9C87DDEE6D4461C881F69AF_label_en-US" xlink:label="lab_us-gaap_StatementClassOfStockAxis_588023A9D9C87DDEE6D4461C881F69AF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Class of Stock [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_588023A9D9C87DDEE6D4461C881F69AF" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementClassOfStockAxis_588023A9D9C87DDEE6D4461C881F69AF" xlink:to="lab_us-gaap_StatementClassOfStockAxis_588023A9D9C87DDEE6D4461C881F69AF" xlink:type="arc"/>
<link:label id="lab_us-gaap_ClassOfStockDomain_55BC9E7E180217F5D3B6461C881FFE0B_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfStockDomain_55BC9E7E180217F5D3B6461C881FFE0B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Class of Stock [Domain] </link:label>
<link:label id="lab_us-gaap_ClassOfStockDomain_55BC9E7E180217F5D3B6461C881FFE0B_label_en-US" xlink:label="lab_us-gaap_ClassOfStockDomain_55BC9E7E180217F5D3B6461C881FFE0B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Class of Stock [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_55BC9E7E180217F5D3B6461C881FFE0B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfStockDomain_55BC9E7E180217F5D3B6461C881FFE0B" xlink:to="lab_us-gaap_ClassOfStockDomain_55BC9E7E180217F5D3B6461C881FFE0B" xlink:type="arc"/>
<link:label id="lab_it_TargetAmountMember_19F6F785EC8C92BDEEFE461C881FC101_terseLabel_en-US" xlink:label="lab_it_TargetAmountMember_19F6F785EC8C92BDEEFE461C881FC101" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Target amount </link:label>
<link:label id="lab_it_TargetAmountMember_19F6F785EC8C92BDEEFE461C881FC101_label_en-US" xlink:label="lab_it_TargetAmountMember_19F6F785EC8C92BDEEFE461C881FC101" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Target Amount [Member] </link:label>
<link:label id="lab_it_TargetAmountMember_19F6F785EC8C92BDEEFE461C881FC101_documentation_en-US" xlink:label="lab_it_TargetAmountMember_19F6F785EC8C92BDEEFE461C881FC101" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> -- None. No documentation exists for this element. -- </link:label>
<link:loc xlink:href="it-20190930.xsd#it_TargetAmountMember" xlink:label="loc_it_TargetAmountMember_19F6F785EC8C92BDEEFE461C881FC101" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_TargetAmountMember_19F6F785EC8C92BDEEFE461C881FC101" xlink:to="lab_it_TargetAmountMember_19F6F785EC8C92BDEEFE461C881FC101" xlink:type="arc"/>
<link:label id="lab_it_ShareBasedCompensationRightToReceiveShare_C82C3317CF8397C075AA461C88201F0D_terseLabel_en-US" xlink:label="lab_it_ShareBasedCompensationRightToReceiveShare_C82C3317CF8397C075AA461C88201F0D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Right to receive, shares </link:label>
<link:label id="lab_it_ShareBasedCompensationRightToReceiveShare_C82C3317CF8397C075AA461C88201F0D_label_en-US" xlink:label="lab_it_ShareBasedCompensationRightToReceiveShare_C82C3317CF8397C075AA461C88201F0D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-Based Compensation, Right To Receive, Share </link:label>
<link:label id="lab_it_ShareBasedCompensationRightToReceiveShare_C82C3317CF8397C075AA461C88201F0D_documentation_en-US" xlink:label="lab_it_ShareBasedCompensationRightToReceiveShare_C82C3317CF8397C075AA461C88201F0D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Share-Based Compensation, Right To Receive, Share </link:label>
<link:loc xlink:href="it-20190930.xsd#it_ShareBasedCompensationRightToReceiveShare" xlink:label="loc_it_ShareBasedCompensationRightToReceiveShare_C82C3317CF8397C075AA461C88201F0D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_ShareBasedCompensationRightToReceiveShare_C82C3317CF8397C075AA461C88201F0D" xlink:to="lab_it_ShareBasedCompensationRightToReceiveShare_C82C3317CF8397C075AA461C88201F0D" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_5B5ED15A494DB4AF04CE461C882063A8_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_5B5ED15A494DB4AF04CE461C882063A8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Award vesting period </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_5B5ED15A494DB4AF04CE461C882063A8_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_5B5ED15A494DB4AF04CE461C882063A8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_5B5ED15A494DB4AF04CE461C882063A8" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_5B5ED15A494DB4AF04CE461C882063A8" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_5B5ED15A494DB4AF04CE461C882063A8" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_75F8BC54070D21AECE80461C8820FE58_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_75F8BC54070D21AECE80461C8820FE58" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Restricted Stock Units (RSUs) [Roll Forward] </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_75F8BC54070D21AECE80461C8820FE58_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_75F8BC54070D21AECE80461C8820FE58" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_75F8BC54070D21AECE80461C8820FE58" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_75F8BC54070D21AECE80461C8820FE58" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_75F8BC54070D21AECE80461C8820FE58" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_ABAD3EC2822AEE054FA6461C882079FC_periodStartLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_ABAD3EC2822AEE054FA6461C882079FC" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Outstanding beginning balance (in shares) </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_ABAD3EC2822AEE054FA6461C882079FC_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_ABAD3EC2822AEE054FA6461C882079FC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_ABAD3EC2822AEE054FA6461C882079FC" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LesseeLeaseDescriptionTable_75B2799F4E71E94D33BA1D78E9B8C254_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeLeaseDescriptionTable_75B2799F4E71E94D33BA1D78E9B8C254" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Description [Table] </link:label>
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<link:label id="lab_country_US_3F45BF8AE956B6F1CDD31D791B3E9B82_label_en-US" xlink:label="lab_country_US_3F45BF8AE956B6F1CDD31D791B3E9B82" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> UNITED STATES </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="loc_country_US_3F45BF8AE956B6F1CDD31D791B3E9B82" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LesseeLeaseDescriptionLineItems_E74A5C645D412445900E1D78E9B98C92_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeLeaseDescriptionLineItems_E74A5C645D412445900E1D78E9B98C92" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Description [Line Items] </link:label>
<link:label id="lab_us-gaap_LesseeLeaseDescriptionLineItems_E74A5C645D412445900E1D78E9B98C92_label_en-US" xlink:label="lab_us-gaap_LesseeLeaseDescriptionLineItems_E74A5C645D412445900E1D78E9B98C92" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Lease, Description [Line Items] </link:label>
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<link:label id="lab_it_OperatingLeasesConcentrationPercentageOfPayments_1846185416F8A1986F321D781B7BB9BC_terseLabel_en-US" xlink:label="lab_it_OperatingLeasesConcentrationPercentageOfPayments_1846185416F8A1986F321D781B7BB9BC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Percentage of lease payments </link:label>
<link:label id="lab_it_OperatingLeasesConcentrationPercentageOfPayments_1846185416F8A1986F321D781B7BB9BC_label_en-US" xlink:label="lab_it_OperatingLeasesConcentrationPercentageOfPayments_1846185416F8A1986F321D781B7BB9BC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Concentration Percentage Of Payments </link:label>
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<link:loc xlink:href="it-20190930.xsd#it_OperatingLeasesConcentrationPercentageOfPayments" xlink:label="loc_it_OperatingLeasesConcentrationPercentageOfPayments_1846185416F8A1986F321D781B7BB9BC" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_D5921DB6B6646B15F2791D6B604AFFDF_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_D5921DB6B6646B15F2791D6B604AFFDF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating Lease Payments </link:label>
<link:label id="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_D5921DB6B6646B15F2791D6B604AFFDF_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_D5921DB6B6646B15F2791D6B604AFFDF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payment, Due [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract" xlink:label="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_D5921DB6B6646B15F2791D6B604AFFDF" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_8A047B1BE3B8D97C18911D6B604B5FC4_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_8A047B1BE3B8D97C18911D6B604B5FC4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2019 (remaining three months) </link:label>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_8A047B1BE3B8D97C18911D6B604B5FC4_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_8A047B1BE3B8D97C18911D6B604B5FC4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_8A047B1BE3B8D97C18911D6B604B5FC4" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_8A047B1BE3B8D97C18911D6B604B5FC4" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_8A047B1BE3B8D97C18911D6B604B5FC4" xlink:type="arc"/>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_60E7AE6778E19D8A1C5D1D6B604BBEC9_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_60E7AE6778E19D8A1C5D1D6B604BBEC9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2020 </link:label>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_60E7AE6778E19D8A1C5D1D6B604BBEC9_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_60E7AE6778E19D8A1C5D1D6B604BBEC9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payments, Due Year Two </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_60E7AE6778E19D8A1C5D1D6B604BBEC9" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_60E7AE6778E19D8A1C5D1D6B604BBEC9" xlink:to="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_60E7AE6778E19D8A1C5D1D6B604BBEC9" xlink:type="arc"/>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_E16829B1D774BD006F161D6B604B48C8_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_E16829B1D774BD006F161D6B604B48C8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2021 </link:label>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_E16829B1D774BD006F161D6B604B48C8_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_E16829B1D774BD006F161D6B604B48C8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payments, Due Year Three </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_E16829B1D774BD006F161D6B604B48C8" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_6F830480292B6D434DE71D6B6050BCA3_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_6F830480292B6D434DE71D6B6050BCA3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2022 </link:label>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_6F830480292B6D434DE71D6B6050BCA3_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_6F830480292B6D434DE71D6B6050BCA3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payments, Due Year Four </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_6F830480292B6D434DE71D6B6050BCA3" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_D61FF56DC7CC7B1658731D6B60503329_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_D61FF56DC7CC7B1658731D6B60503329" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2023 </link:label>
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<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_4C76B32B82C7543FA6E31D6B60511EF1_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_4C76B32B82C7543FA6E31D6B60511EF1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Thereafter </link:label>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_4C76B32B82C7543FA6E31D6B60511EF1_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_4C76B32B82C7543FA6E31D6B60511EF1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Payments, Due after Year Five </link:label>
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<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_9891AB7DC082C43DBCB01D6B6051C7EB_totalLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_9891AB7DC082C43DBCB01D6B6051C7EB" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total future minimum operating lease payments and estimated sublease cash receipts </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_A80866B712DA943FF18B1D6B6051E387" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLeaseLiability_E60768D0FDC9B8D1EB461D6B6051E54E_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiability_E60768D0FDC9B8D1EB461D6B6051E54E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Total per the Condensed Consolidated Balance Sheet </link:label>
<link:label id="lab_us-gaap_OperatingLeaseLiability_E60768D0FDC9B8D1EB461D6B6051E54E_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiability_E60768D0FDC9B8D1EB461D6B6051E54E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Liability </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_E60768D0FDC9B8D1EB461D6B6051E54E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseLiability_E60768D0FDC9B8D1EB461D6B6051E54E" xlink:to="lab_us-gaap_OperatingLeaseLiability_E60768D0FDC9B8D1EB461D6B6051E54E" xlink:type="arc"/>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_8202D36689DA4960DD191D6B60519A3D_terseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_8202D36689DA4960DD191D6B60519A3D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Sublease Cash Receipts </link:label>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_8202D36689DA4960DD191D6B60519A3D_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_8202D36689DA4960DD191D6B60519A3D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_8202D36689DA4960DD191D6B60519A3D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_8202D36689DA4960DD191D6B60519A3D" xlink:to="lab_us-gaap_LessorOperatingLeasePaymentsFiscalYearMaturityAbstract_8202D36689DA4960DD191D6B60519A3D" xlink:type="arc"/>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear_34BDF51CBD26FFBCCA0B1D6B6052EE3F_terseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear_34BDF51CBD26FFBCCA0B1D6B6052EE3F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2019 (remaining three months) </link:label>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear_34BDF51CBD26FFBCCA0B1D6B6052EE3F_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear_34BDF51CBD26FFBCCA0B1D6B6052EE3F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessor, Operating Lease, Payments to be Received, Remainder of Fiscal Year </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear_34BDF51CBD26FFBCCA0B1D6B6052EE3F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear_34BDF51CBD26FFBCCA0B1D6B6052EE3F" xlink:to="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear_34BDF51CBD26FFBCCA0B1D6B6052EE3F" xlink:type="arc"/>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears_AC99E1EE41BAE9D2DD101D6B605248B2_terseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears_AC99E1EE41BAE9D2DD101D6B605248B2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2020 </link:label>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears_AC99E1EE41BAE9D2DD101D6B605248B2_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears_AC99E1EE41BAE9D2DD101D6B605248B2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessor, Operating Lease, Payments to be Received, Two Years </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears_AC99E1EE41BAE9D2DD101D6B605248B2" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears_AC99E1EE41BAE9D2DD101D6B605248B2" xlink:to="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears_AC99E1EE41BAE9D2DD101D6B605248B2" xlink:type="arc"/>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears_2CB82B7155EFA146BD261D6B60522963_terseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears_2CB82B7155EFA146BD261D6B60522963" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2021 </link:label>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears_2CB82B7155EFA146BD261D6B60522963_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears_2CB82B7155EFA146BD261D6B60522963" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessor, Operating Lease, Payments to be Received, Three Years </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears_2CB82B7155EFA146BD261D6B60522963" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears_2CB82B7155EFA146BD261D6B60522963" xlink:to="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears_2CB82B7155EFA146BD261D6B60522963" xlink:type="arc"/>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears_14BBCA22F1BA3167E0281D6B6052B26B_terseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears_14BBCA22F1BA3167E0281D6B6052B26B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2022 </link:label>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears_14BBCA22F1BA3167E0281D6B6052B26B_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears_14BBCA22F1BA3167E0281D6B6052B26B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessor, Operating Lease, Payments to be Received, Four Years </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears_14BBCA22F1BA3167E0281D6B6052B26B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears_14BBCA22F1BA3167E0281D6B6052B26B" xlink:to="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears_14BBCA22F1BA3167E0281D6B6052B26B" xlink:type="arc"/>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears_9F92C71E525C05870D371D6B6052E978_terseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears_9F92C71E525C05870D371D6B6052E978" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2023 </link:label>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears_9F92C71E525C05870D371D6B6052E978_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears_9F92C71E525C05870D371D6B6052E978" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessor, Operating Lease, Payments to be Received, Five Years </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears_9F92C71E525C05870D371D6B6052E978" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears_9F92C71E525C05870D371D6B6052E978" xlink:to="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears_9F92C71E525C05870D371D6B6052E978" xlink:type="arc"/>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter_543807722FFB5932A3AF1D6B60524349_terseLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter_543807722FFB5932A3AF1D6B60524349" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Thereafter </link:label>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter_543807722FFB5932A3AF1D6B60524349_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter_543807722FFB5932A3AF1D6B60524349" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessor, Operating Lease, Payments to be Received, Thereafter </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter_543807722FFB5932A3AF1D6B60524349" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter_543807722FFB5932A3AF1D6B60524349" xlink:to="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter_543807722FFB5932A3AF1D6B60524349" xlink:type="arc"/>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceived_67F92CB44A352064E3AA1D6B60532FD7_totalLabel_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceived_67F92CB44A352064E3AA1D6B60532FD7" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total future minimum operating lease payments and estimated sublease cash receipts (1) </link:label>
<link:label id="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceived_67F92CB44A352064E3AA1D6B60532FD7_label_en-US" xlink:label="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceived_67F92CB44A352064E3AA1D6B60532FD7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessor, Operating Lease, Payments to be Received </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceived" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceived_67F92CB44A352064E3AA1D6B60532FD7" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceived_67F92CB44A352064E3AA1D6B60532FD7" xlink:to="lab_us-gaap_LessorOperatingLeasePaymentsToBeReceived_67F92CB44A352064E3AA1D6B60532FD7" xlink:type="arc"/>
<link:label id="lab_us-gaap_StockholdersEquityNoteAbstract_1AE11E5B55027098B47FD0AE1A1ACA2D_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityNoteAbstract_1AE11E5B55027098B47FD0AE1A1ACA2D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stockholders' Equity Note [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityNoteAbstract" xlink:label="loc_us-gaap_StockholdersEquityNoteAbstract_1AE11E5B55027098B47FD0AE1A1ACA2D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockholdersEquityNoteAbstract_1AE11E5B55027098B47FD0AE1A1ACA2D" xlink:to="lab_us-gaap_StockholdersEquityNoteAbstract_1AE11E5B55027098B47FD0AE1A1ACA2D" xlink:type="arc"/>
<link:label id="lab_us-gaap_StockRepurchaseProgramAuthorizedAmount1_6813FC8946A63675F36ED0AE1A1A0970_terseLabel_en-US" xlink:label="lab_us-gaap_StockRepurchaseProgramAuthorizedAmount1_6813FC8946A63675F36ED0AE1A1A0970" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock repurchase program, authorized amount </link:label>
<link:label id="lab_us-gaap_StockRepurchaseProgramAuthorizedAmount1_6813FC8946A63675F36ED0AE1A1A0970_label_en-US" xlink:label="lab_us-gaap_StockRepurchaseProgramAuthorizedAmount1_6813FC8946A63675F36ED0AE1A1A0970" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stock Repurchase Program, Authorized Amount </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount1" xlink:label="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_6813FC8946A63675F36ED0AE1A1A0970" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_6813FC8946A63675F36ED0AE1A1A0970" xlink:to="lab_us-gaap_StockRepurchaseProgramAuthorizedAmount1_6813FC8946A63675F36ED0AE1A1A0970" xlink:type="arc"/>
<link:label id="lab_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_144CF6D415CAB44BB057D0AE1A1A0485_terseLabel_en-US" xlink:label="lab_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_144CF6D415CAB44BB057D0AE1A1A0485" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock repurchase program, remaining authorized repurchase amount </link:label>
<link:label id="lab_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_144CF6D415CAB44BB057D0AE1A1A0485_label_en-US" xlink:label="lab_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_144CF6D415CAB44BB057D0AE1A1A0485" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stock Repurchase Program, Remaining Authorized Repurchase Amount </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_144CF6D415CAB44BB057D0AE1A1A0485" xlink:type="locator"/>
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<link:label id="lab_us-gaap_TreasuryStockSharesAcquired_274FB7B68B996698A2FED0AE1A1A068C_terseLabel_en-US" xlink:label="lab_us-gaap_TreasuryStockSharesAcquired_274FB7B68B996698A2FED0AE1A1A068C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of shares repurchased (in shares) </link:label>
<link:label id="lab_us-gaap_TreasuryStockSharesAcquired_274FB7B68B996698A2FED0AE1A1A068C_label_en-US" xlink:label="lab_us-gaap_TreasuryStockSharesAcquired_274FB7B68B996698A2FED0AE1A1A068C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Treasury Stock, Shares, Acquired </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TreasuryStockSharesAcquired" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_274FB7B68B996698A2FED0AE1A1A068C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_AC787832CFA027368CC2D0AE1A1A615D_verboseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_AC787832CFA027368CC2D0AE1A1A615D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Cash paid for repurchased shares </link:label>
<link:label id="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_AC787832CFA027368CC2D0AE1A1A615D_label_en-US" xlink:label="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_AC787832CFA027368CC2D0AE1A1A615D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments for Repurchase of Common Stock </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_AC787832CFA027368CC2D0AE1A1A615D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_AC787832CFA027368CC2D0AE1A1A615D" xlink:to="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_AC787832CFA027368CC2D0AE1A1A615D" xlink:type="arc"/>
<link:label id="lab_it_TreasuryStockAveragePricePaidPerShare_F41D91072883DD3E2AC9D0AE1A1B6B77_terseLabel_en-US" xlink:label="lab_it_TreasuryStockAveragePricePaidPerShare_F41D91072883DD3E2AC9D0AE1A1B6B77" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Treasury stock, average price paid per share (in dollars per share) </link:label>
<link:label id="lab_it_TreasuryStockAveragePricePaidPerShare_F41D91072883DD3E2AC9D0AE1A1B6B77_label_en-US" xlink:label="lab_it_TreasuryStockAveragePricePaidPerShare_F41D91072883DD3E2AC9D0AE1A1B6B77" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Treasury Stock Average Price Paid Per Share </link:label>
<link:label id="lab_it_TreasuryStockAveragePricePaidPerShare_F41D91072883DD3E2AC9D0AE1A1B6B77_documentation_en-US" xlink:label="lab_it_TreasuryStockAveragePricePaidPerShare_F41D91072883DD3E2AC9D0AE1A1B6B77" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Treasury Stock Average Price Paid Per Share. </link:label>
<link:loc xlink:href="it-20190930.xsd#it_TreasuryStockAveragePricePaidPerShare" xlink:label="loc_it_TreasuryStockAveragePricePaidPerShare_F41D91072883DD3E2AC9D0AE1A1B6B77" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLeaseCost_12431BFD562BC69A1030B8A6BB43A593_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseCost_3BC2421F0DC8540883E00D69689941C7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating lease cost </link:label>
<link:label id="lab_us-gaap_OperatingLeaseCost_12431BFD562BC69A1030B8A6BB43A593_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseCost_3BC2421F0DC8540883E00D69689941C7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Cost </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseCost" xlink:label="loc_us-gaap_OperatingLeaseCost_3BC2421F0DC8540883E00D69689941C7" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseCost_3BC2421F0DC8540883E00D69689941C7" xlink:to="lab_us-gaap_OperatingLeaseCost_3BC2421F0DC8540883E00D69689941C7" xlink:type="arc"/>
<link:label id="lab_us-gaap_VariableLeaseCost_C00BFBDF6740E1BBF593B8A6BB4342EC_terseLabel_en-US" xlink:label="lab_us-gaap_VariableLeaseCost_68F095205B485B75949456A564343647" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Variable lease cost </link:label>
<link:label id="lab_us-gaap_VariableLeaseCost_C00BFBDF6740E1BBF593B8A6BB4342EC_label_en-US" xlink:label="lab_us-gaap_VariableLeaseCost_68F095205B485B75949456A564343647" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Variable Lease, Cost </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VariableLeaseCost" xlink:label="loc_us-gaap_VariableLeaseCost_68F095205B485B75949456A564343647" xlink:type="locator"/>
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<link:label id="lab_us-gaap_SubleaseIncome_01715D89EF9B1FC8F88DB8A6BB44EE32_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_SubleaseIncome_6FEBB5C1BB3A5A59B31BD1AED5BC68AB" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Sublease income </link:label>
<link:label id="lab_us-gaap_SubleaseIncome_01715D89EF9B1FC8F88DB8A6BB44EE32_label_en-US" xlink:label="lab_us-gaap_SubleaseIncome_6FEBB5C1BB3A5A59B31BD1AED5BC68AB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Sublease Income </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubleaseIncome" xlink:label="loc_us-gaap_SubleaseIncome_6FEBB5C1BB3A5A59B31BD1AED5BC68AB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubleaseIncome_6FEBB5C1BB3A5A59B31BD1AED5BC68AB" xlink:to="lab_us-gaap_SubleaseIncome_6FEBB5C1BB3A5A59B31BD1AED5BC68AB" xlink:type="arc"/>
<link:label id="lab_us-gaap_LeaseCost_8D914FF016AFDC7957D0B8A6BB443805_totalLabel_en-US" xlink:label="lab_us-gaap_LeaseCost_C696187ADB795BA79D843C00A89068BD" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total lease cost, net </link:label>
<link:label id="lab_us-gaap_LeaseCost_8D914FF016AFDC7957D0B8A6BB443805_label_en-US" xlink:label="lab_us-gaap_LeaseCost_C696187ADB795BA79D843C00A89068BD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lease, Cost </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseCost" xlink:label="loc_us-gaap_LeaseCost_C696187ADB795BA79D843C00A89068BD" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LeaseCost_C696187ADB795BA79D843C00A89068BD" xlink:to="lab_us-gaap_LeaseCost_C696187ADB795BA79D843C00A89068BD" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeasePayments_D0B32D2841019460E99EB8A6BB44624A_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasePayments_8D09A72314EC5B6E85B1593A86778DBA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash paid for amounts included in the measurement of operating lease liabilities </link:label>
<link:label id="lab_us-gaap_OperatingLeasePayments_D0B32D2841019460E99EB8A6BB44624A_label_en-US" xlink:label="lab_us-gaap_OperatingLeasePayments_8D09A72314EC5B6E85B1593A86778DBA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Payments </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasePayments" xlink:label="loc_us-gaap_OperatingLeasePayments_8D09A72314EC5B6E85B1593A86778DBA" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasePayments_8D09A72314EC5B6E85B1593A86778DBA" xlink:to="lab_us-gaap_OperatingLeasePayments_8D09A72314EC5B6E85B1593A86778DBA" xlink:type="arc"/>
<link:label id="lab_us-gaap_ProceedsFromLeasePayments_DAD0CAFB6329CBF37714B8A6BB455858_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromLeasePayments_DEB23C1301485CF6AED2F2BCC734F6E2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash receipts from sublease arrangements </link:label>
<link:label id="lab_us-gaap_ProceedsFromLeasePayments_DAD0CAFB6329CBF37714B8A6BB455858_label_en-US" xlink:label="lab_us-gaap_ProceedsFromLeasePayments_DEB23C1301485CF6AED2F2BCC734F6E2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from Lease Payments </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromLeasePayments" xlink:label="loc_us-gaap_ProceedsFromLeasePayments_DEB23C1301485CF6AED2F2BCC734F6E2" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromLeasePayments_DEB23C1301485CF6AED2F2BCC734F6E2" xlink:to="lab_us-gaap_ProceedsFromLeasePayments_DEB23C1301485CF6AED2F2BCC734F6E2" xlink:type="arc"/>
<link:label id="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_704D299E31EA81110796B8A6BB453834_terseLabel_en-US" xlink:label="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_CC418AC6E5985948BAF299DBF1A26245" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Right-of-use assets obtained in exchange for new operating lease liabilities </link:label>
<link:label id="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_704D299E31EA81110796B8A6BB453834_label_en-US" xlink:label="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_CC418AC6E5985948BAF299DBF1A26245" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Right-of-Use Asset Obtained in Exchange for Operating Lease Liability </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_CC418AC6E5985948BAF299DBF1A26245" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_CC418AC6E5985948BAF299DBF1A26245" xlink:to="lab_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_CC418AC6E5985948BAF299DBF1A26245" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_8E80FE1FBDD25416CFBFB8A6BB45252E_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_E517E71827915D51A9D6E0B282097436" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Weighted average remaining lease term for operating leases (in years) </link:label>
<link:label id="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_8E80FE1FBDD25416CFBFB8A6BB45252E_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_E517E71827915D51A9D6E0B282097436" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Weighted Average Remaining Lease Term </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_E517E71827915D51A9D6E0B282097436" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_E517E71827915D51A9D6E0B282097436" xlink:to="lab_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_E517E71827915D51A9D6E0B282097436" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_C135CBC8EAE0C1AF696AB8A6BB45E2BA_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_77B8A7DDCEF952FE8198C8B803CA43C4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Weighted average discount rate for operating leases </link:label>
<link:label id="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_C135CBC8EAE0C1AF696AB8A6BB45E2BA_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_77B8A7DDCEF952FE8198C8B803CA43C4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Weighted Average Discount Rate, Percent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_77B8A7DDCEF952FE8198C8B803CA43C4" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_77B8A7DDCEF952FE8198C8B803CA43C4" xlink:to="lab_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_77B8A7DDCEF952FE8198C8B803CA43C4" xlink:type="arc"/>
<link:label id="lab_it_OperatingLeaseCostSubleasingActivities_FB1869E384262219C1F5B8A6BB4583EC_terseLabel_en-US" xlink:label="lab_it_OperatingLeaseCostSubleasingActivities_B35F4ECCD74D58748515EE88D6F01738" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cost for subleasing activities </link:label>
<link:label id="lab_it_OperatingLeaseCostSubleasingActivities_FB1869E384262219C1F5B8A6BB4583EC_label_en-US" xlink:label="lab_it_OperatingLeaseCostSubleasingActivities_B35F4ECCD74D58748515EE88D6F01738" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Cost, Subleasing Activities </link:label>
<link:label id="lab_it_OperatingLeaseCostSubleasingActivities_FB1869E384262219C1F5B8A6BB4583EC_documentation_en-US" xlink:label="lab_it_OperatingLeaseCostSubleasingActivities_B35F4ECCD74D58748515EE88D6F01738" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Operating Lease, Cost, Subleasing Activities </link:label>
<link:loc xlink:href="it-20190930.xsd#it_OperatingLeaseCostSubleasingActivities" xlink:label="loc_it_OperatingLeaseCostSubleasingActivities_B35F4ECCD74D58748515EE88D6F01738" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_35941F57E5E05DF52D6716F524B03E89_label_en-US" xlink:label="lab_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_35941F57E5E05DF52D6716F524B03E89" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement of Comprehensive Income [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract" xlink:label="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_35941F57E5E05DF52D6716F524B03E89" xlink:type="locator"/>
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<link:label id="lab_us-gaap_NetIncomeLoss_8A9A54BEBA082307BB4316F524B007B7_terseLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_8A9A54BEBA082307BB4316F524B007B7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Net income </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_8A9A54BEBA082307BB4316F524B007B7" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_6B69F812FBA099DFD7B116F524B0DA11_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_6B69F812FBA099DFD7B116F524B0DA11" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other comprehensive (loss) income, net of tax: </link:label>
<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_6B69F812FBA099DFD7B116F524B0DA11_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_6B69F812FBA099DFD7B116F524B0DA11" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Comprehensive Income (Loss), Net of Tax [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_6B69F812FBA099DFD7B116F524B0DA11" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_83A43673A1F7EA821F7416F524B1EDE0_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_83A43673A1F7EA821F7416F524B1EDE0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Foreign currency translation adjustments </link:label>
<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_83A43673A1F7EA821F7416F524B1EDE0_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_83A43673A1F7EA821F7416F524B1EDE0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_83A43673A1F7EA821F7416F524B1EDE0" xlink:type="locator"/>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_92769213E434DD90A4B117101C671335" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax_20DFEC7C7335378BF57A16F524B15693_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax_20DFEC7C7335378BF57A16F524B15693" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Comprehensive Income (Loss), Net of Tax </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_20DFEC7C7335378BF57A16F524B15693" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTax_9852A8475BD61D165E4C16F524B139C1_totalLabel_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTax_9852A8475BD61D165E4C16F524B139C1" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Comprehensive income </link:label>
<link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTax_9852A8475BD61D165E4C16F524B139C1_label_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTax_9852A8475BD61D165E4C16F524B139C1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Comprehensive Income (Loss), Net of Tax, Attributable to Parent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_9852A8475BD61D165E4C16F524B139C1" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DebtDisclosureAbstract_438D2711D02CB661EE53D0AE1A35DEC5_label_en-US" xlink:label="lab_us-gaap_DebtDisclosureAbstract_438D2711D02CB661EE53D0AE1A35DEC5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Disclosure [Abstract] </link:label>
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<link:label id="lab_us-gaap_DerivativeTable_0A5158A3DB15782A34FED0AE1A36A578_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeTable_0A5158A3DB15782A34FED0AE1A36A578" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Derivative [Table] </link:label>
<link:label id="lab_us-gaap_DerivativeTable_0A5158A3DB15782A34FED0AE1A36A578_label_en-US" xlink:label="lab_us-gaap_DerivativeTable_0A5158A3DB15782A34FED0AE1A36A578" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Derivative [Table] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeTable" xlink:label="loc_us-gaap_DerivativeTable_0A5158A3DB15782A34FED0AE1A36A578" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DerivativeInstrumentRiskAxis_82D8829183A268B178F8D0AE1A3784B8_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentRiskAxis_82D8829183A268B178F8D0AE1A3784B8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Derivative Instrument [Axis] </link:label>
<link:label id="lab_us-gaap_DerivativeInstrumentRiskAxis_82D8829183A268B178F8D0AE1A3784B8_label_en-US" xlink:label="lab_us-gaap_DerivativeInstrumentRiskAxis_82D8829183A268B178F8D0AE1A3784B8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Derivative Instrument [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_82D8829183A268B178F8D0AE1A3784B8" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DerivativeContractTypeDomain_445B8CE96E8569B3E5B1D0AE1A370DA2_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeContractTypeDomain_445B8CE96E8569B3E5B1D0AE1A370DA2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Derivative Contract [Domain] </link:label>
<link:label id="lab_us-gaap_DerivativeContractTypeDomain_445B8CE96E8569B3E5B1D0AE1A370DA2_label_en-US" xlink:label="lab_us-gaap_DerivativeContractTypeDomain_445B8CE96E8569B3E5B1D0AE1A370DA2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Derivative Contract [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_445B8CE96E8569B3E5B1D0AE1A370DA2" xlink:type="locator"/>
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<link:label id="lab_us-gaap_InterestRateSwapMember_B1893E6FE7E803E122B7D0AE1A377B5C_terseLabel_en-US" xlink:label="lab_us-gaap_InterestRateSwapMember_B1893E6FE7E803E122B7D0AE1A377B5C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Interest rate swaps </link:label>
<link:label id="lab_us-gaap_InterestRateSwapMember_B1893E6FE7E803E122B7D0AE1A377B5C_label_en-US" xlink:label="lab_us-gaap_InterestRateSwapMember_B1893E6FE7E803E122B7D0AE1A377B5C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Interest Rate Swap [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestRateSwapMember" xlink:label="loc_us-gaap_InterestRateSwapMember_B1893E6FE7E803E122B7D0AE1A377B5C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DerivativeLineItems_90CEA99DA4E318D12B0FD0AE1A38AE5A_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeLineItems_90CEA99DA4E318D12B0FD0AE1A38AE5A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Derivative [Line Items] </link:label>
<link:label id="lab_us-gaap_DerivativeLineItems_90CEA99DA4E318D12B0FD0AE1A38AE5A_label_en-US" xlink:label="lab_us-gaap_DerivativeLineItems_90CEA99DA4E318D12B0FD0AE1A38AE5A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Derivative [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeLineItems" xlink:label="loc_us-gaap_DerivativeLineItems_90CEA99DA4E318D12B0FD0AE1A38AE5A" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DerivativeNumberOfInstrumentsHeld_78AE17E56C67DCA65F4CD0AE1A38F0AD_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeNumberOfInstrumentsHeld_78AE17E56C67DCA65F4CD0AE1A38F0AD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of contracts </link:label>
<link:label id="lab_us-gaap_DerivativeNumberOfInstrumentsHeld_78AE17E56C67DCA65F4CD0AE1A38F0AD_label_en-US" xlink:label="lab_us-gaap_DerivativeNumberOfInstrumentsHeld_78AE17E56C67DCA65F4CD0AE1A38F0AD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Derivative, Number of Instruments Held </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeNumberOfInstrumentsHeld" xlink:label="loc_us-gaap_DerivativeNumberOfInstrumentsHeld_78AE17E56C67DCA65F4CD0AE1A38F0AD" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DerivativeNotionalAmount_C56972D0C90794737D01D0AE1A383C4A_label_en-US" xlink:label="lab_us-gaap_DerivativeNotionalAmount_C56972D0C90794737D01D0AE1A383C4A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Derivative, Notional Amount </link:label>
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<link:label id="lab_us-gaap_DerivativeFixedInterestRate_057DD52A9235E00C1A15D0AE1A38CDB5_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeFixedInterestRate_057DD52A9235E00C1A15D0AE1A38CDB5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fixed interest rate </link:label>
<link:label id="lab_us-gaap_DerivativeFixedInterestRate_057DD52A9235E00C1A15D0AE1A38CDB5_label_en-US" xlink:label="lab_us-gaap_DerivativeFixedInterestRate_057DD52A9235E00C1A15D0AE1A38CDB5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Derivative, Fixed Interest Rate </link:label>
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<link:label id="lab_us-gaap_InterestRateFairValueHedgeDerivativeAtFairValueNet_9A83489D4BEE3474E653D0AE1A39A4CA_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_InterestRateFairValueHedgeDerivativeAtFairValueNet_9A83489D4BEE3474E653D0AE1A39A4CA" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Net negative fair value (liability) </link:label>
<link:label id="lab_us-gaap_InterestRateFairValueHedgeDerivativeAtFairValueNet_9A83489D4BEE3474E653D0AE1A39A4CA_label_en-US" xlink:label="lab_us-gaap_InterestRateFairValueHedgeDerivativeAtFairValueNet_9A83489D4BEE3474E653D0AE1A39A4CA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Interest Rate Fair Value Hedge Derivative at Fair Value, Net </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestRateFairValueHedgeDerivativeAtFairValueNet" xlink:label="loc_us-gaap_InterestRateFairValueHedgeDerivativeAtFairValueNet_9A83489D4BEE3474E653D0AE1A39A4CA" xlink:type="locator"/>
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<link:label id="lab_dei_CoverAbstract_66B0C544DFAFF249D871FECAFD972BC3_label_en-US" xlink:label="lab_dei_CoverAbstract_66B0C544DFAFF249D871FECAFD972BC3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cover page. </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_CoverAbstract" xlink:label="loc_dei_CoverAbstract_66B0C544DFAFF249D871FECAFD972BC3" xlink:type="locator"/>
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<link:label id="lab_dei_DocumentType_6170541D04868585CFEAFECAFD98A5D7_terseLabel_en-US" xlink:label="lab_dei_DocumentType_6170541D04868585CFEAFECAFD98A5D7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Document Type </link:label>
<link:label id="lab_dei_DocumentType_6170541D04868585CFEAFECAFD98A5D7_label_en-US" xlink:label="lab_dei_DocumentType_6170541D04868585CFEAFECAFD98A5D7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Document Type </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentType" xlink:label="loc_dei_DocumentType_6170541D04868585CFEAFECAFD98A5D7" xlink:type="locator"/>
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<link:label id="lab_dei_DocumentQuarterlyReport_D06EF274B8D4ADC8845CFECAFD985475_terseLabel_en-US" xlink:label="lab_dei_DocumentQuarterlyReport_D06EF274B8D4ADC8845CFECAFD985475" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Document Quarterly Report </link:label>
<link:label id="lab_dei_DocumentQuarterlyReport_D06EF274B8D4ADC8845CFECAFD985475_label_en-US" xlink:label="lab_dei_DocumentQuarterlyReport_D06EF274B8D4ADC8845CFECAFD985475" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Document Quarterly Report </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentQuarterlyReport" xlink:label="loc_dei_DocumentQuarterlyReport_D06EF274B8D4ADC8845CFECAFD985475" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentQuarterlyReport_D06EF274B8D4ADC8845CFECAFD985475" xlink:to="lab_dei_DocumentQuarterlyReport_D06EF274B8D4ADC8845CFECAFD985475" xlink:type="arc"/>
<link:label id="lab_dei_DocumentPeriodEndDate_1617E017DDBA7352EFD1FECAFD98FB2A_terseLabel_en-US" xlink:label="lab_dei_DocumentPeriodEndDate_1617E017DDBA7352EFD1FECAFD98FB2A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Document Period End Date </link:label>
<link:label id="lab_dei_DocumentPeriodEndDate_1617E017DDBA7352EFD1FECAFD98FB2A_label_en-US" xlink:label="lab_dei_DocumentPeriodEndDate_1617E017DDBA7352EFD1FECAFD98FB2A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Document Period End Date </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="loc_dei_DocumentPeriodEndDate_1617E017DDBA7352EFD1FECAFD98FB2A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentPeriodEndDate_1617E017DDBA7352EFD1FECAFD98FB2A" xlink:to="lab_dei_DocumentPeriodEndDate_1617E017DDBA7352EFD1FECAFD98FB2A" xlink:type="arc"/>
<link:label id="lab_dei_DocumentTransitionReport_DF69FF677FADE78D37C8FECAFD98085B_terseLabel_en-US" xlink:label="lab_dei_DocumentTransitionReport_DF69FF677FADE78D37C8FECAFD98085B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Document Transition Report </link:label>
<link:label id="lab_dei_DocumentTransitionReport_DF69FF677FADE78D37C8FECAFD98085B_label_en-US" xlink:label="lab_dei_DocumentTransitionReport_DF69FF677FADE78D37C8FECAFD98085B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Document Transition Report </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentTransitionReport" xlink:label="loc_dei_DocumentTransitionReport_DF69FF677FADE78D37C8FECAFD98085B" xlink:type="locator"/>
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<link:label id="lab_dei_EntityFileNumber_52565A7E4F19257F80E4FECAFD99FF9B_terseLabel_en-US" xlink:label="lab_dei_EntityFileNumber_52565A7E4F19257F80E4FECAFD99FF9B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity File Number </link:label>
<link:label id="lab_dei_EntityFileNumber_52565A7E4F19257F80E4FECAFD99FF9B_label_en-US" xlink:label="lab_dei_EntityFileNumber_52565A7E4F19257F80E4FECAFD99FF9B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity File Number </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityFileNumber" xlink:label="loc_dei_EntityFileNumber_52565A7E4F19257F80E4FECAFD99FF9B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityFileNumber_52565A7E4F19257F80E4FECAFD99FF9B" xlink:to="lab_dei_EntityFileNumber_52565A7E4F19257F80E4FECAFD99FF9B" xlink:type="arc"/>
<link:label id="lab_dei_EntityRegistrantName_C363546A5D28B7DD91B8FECAFD99B23F_terseLabel_en-US" xlink:label="lab_dei_EntityRegistrantName_C363546A5D28B7DD91B8FECAFD99B23F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Registrant Name </link:label>
<link:label id="lab_dei_EntityRegistrantName_C363546A5D28B7DD91B8FECAFD99B23F_label_en-US" xlink:label="lab_dei_EntityRegistrantName_C363546A5D28B7DD91B8FECAFD99B23F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Registrant Name </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityRegistrantName" xlink:label="loc_dei_EntityRegistrantName_C363546A5D28B7DD91B8FECAFD99B23F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityRegistrantName_C363546A5D28B7DD91B8FECAFD99B23F" xlink:to="lab_dei_EntityRegistrantName_C363546A5D28B7DD91B8FECAFD99B23F" xlink:type="arc"/>
<link:label id="lab_dei_EntityIncorporationStateCountryCode_B28F53E6D07354333585FECAFD99784D_terseLabel_en-US" xlink:label="lab_dei_EntityIncorporationStateCountryCode_B28F53E6D07354333585FECAFD99784D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Incorporation, State or Country Code </link:label>
<link:label id="lab_dei_EntityIncorporationStateCountryCode_B28F53E6D07354333585FECAFD99784D_label_en-US" xlink:label="lab_dei_EntityIncorporationStateCountryCode_B28F53E6D07354333585FECAFD99784D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Incorporation, State or Country Code </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityIncorporationStateCountryCode" xlink:label="loc_dei_EntityIncorporationStateCountryCode_B28F53E6D07354333585FECAFD99784D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityIncorporationStateCountryCode_B28F53E6D07354333585FECAFD99784D" xlink:to="lab_dei_EntityIncorporationStateCountryCode_B28F53E6D07354333585FECAFD99784D" xlink:type="arc"/>
<link:label id="lab_dei_EntityTaxIdentificationNumber_C7F687F6155E01CE7BDCFECAFD99AACB_terseLabel_en-US" xlink:label="lab_dei_EntityTaxIdentificationNumber_C7F687F6155E01CE7BDCFECAFD99AACB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Tax Identification Number </link:label>
<link:label id="lab_dei_EntityTaxIdentificationNumber_C7F687F6155E01CE7BDCFECAFD99AACB_label_en-US" xlink:label="lab_dei_EntityTaxIdentificationNumber_C7F687F6155E01CE7BDCFECAFD99AACB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Tax Identification Number </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityTaxIdentificationNumber" xlink:label="loc_dei_EntityTaxIdentificationNumber_C7F687F6155E01CE7BDCFECAFD99AACB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityTaxIdentificationNumber_C7F687F6155E01CE7BDCFECAFD99AACB" xlink:to="lab_dei_EntityTaxIdentificationNumber_C7F687F6155E01CE7BDCFECAFD99AACB" xlink:type="arc"/>
<link:label id="lab_dei_EntityAddressAddressLine1_9D34A5607D883201B025FECAFD9945B2_terseLabel_en-US" xlink:label="lab_dei_EntityAddressAddressLine1_9D34A5607D883201B025FECAFD9945B2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Address, Address Line One </link:label>
<link:label id="lab_dei_EntityAddressAddressLine1_9D34A5607D883201B025FECAFD9945B2_label_en-US" xlink:label="lab_dei_EntityAddressAddressLine1_9D34A5607D883201B025FECAFD9945B2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Address, Address Line One </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressAddressLine1" xlink:label="loc_dei_EntityAddressAddressLine1_9D34A5607D883201B025FECAFD9945B2" xlink:type="locator"/>
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<link:label id="lab_dei_EntityAddressAddressLine2_76B4A97B2DB75337AC80FECAFD9A6249_terseLabel_en-US" xlink:label="lab_dei_EntityAddressAddressLine2_76B4A97B2DB75337AC80FECAFD9A6249" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Address, Address Line Two </link:label>
<link:label id="lab_dei_EntityAddressAddressLine2_76B4A97B2DB75337AC80FECAFD9A6249_label_en-US" xlink:label="lab_dei_EntityAddressAddressLine2_76B4A97B2DB75337AC80FECAFD9A6249" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Address, Address Line Two </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressAddressLine2" xlink:label="loc_dei_EntityAddressAddressLine2_76B4A97B2DB75337AC80FECAFD9A6249" xlink:type="locator"/>
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<link:label id="lab_dei_EntityAddressPostalZipCode_4432178BA439BE7100F1FECAFD9A192C_terseLabel_en-US" xlink:label="lab_dei_EntityAddressPostalZipCode_4432178BA439BE7100F1FECAFD9A192C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Address, Postal Zip Code </link:label>
<link:label id="lab_dei_EntityAddressPostalZipCode_4432178BA439BE7100F1FECAFD9A192C_label_en-US" xlink:label="lab_dei_EntityAddressPostalZipCode_4432178BA439BE7100F1FECAFD9A192C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Address, Postal Zip Code </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressPostalZipCode" xlink:label="loc_dei_EntityAddressPostalZipCode_4432178BA439BE7100F1FECAFD9A192C" xlink:type="locator"/>
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<link:label id="lab_dei_EntityAddressCityOrTown_EAA527F862270E400A67FECAFD9A6017_terseLabel_en-US" xlink:label="lab_dei_EntityAddressCityOrTown_EAA527F862270E400A67FECAFD9A6017" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Address, City or Town </link:label>
<link:label id="lab_dei_EntityAddressCityOrTown_EAA527F862270E400A67FECAFD9A6017_label_en-US" xlink:label="lab_dei_EntityAddressCityOrTown_EAA527F862270E400A67FECAFD9A6017" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Address, City or Town </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressCityOrTown" xlink:label="loc_dei_EntityAddressCityOrTown_EAA527F862270E400A67FECAFD9A6017" xlink:type="locator"/>
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<link:label id="lab_dei_EntityAddressStateOrProvince_2CAF0404135893AF3832FECAFD9A440C_terseLabel_en-US" xlink:label="lab_dei_EntityAddressStateOrProvince_2CAF0404135893AF3832FECAFD9A440C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Address, State or Province </link:label>
<link:label id="lab_dei_EntityAddressStateOrProvince_2CAF0404135893AF3832FECAFD9A440C_label_en-US" xlink:label="lab_dei_EntityAddressStateOrProvince_2CAF0404135893AF3832FECAFD9A440C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Entity Address, State or Province </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressStateOrProvince" xlink:label="loc_dei_EntityAddressStateOrProvince_2CAF0404135893AF3832FECAFD9A440C" xlink:type="locator"/>
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<link:label id="lab_dei_CityAreaCode_07C876DE2A80D6B5906FFECAFD9A7B44_terseLabel_en-US" xlink:label="lab_dei_CityAreaCode_07C876DE2A80D6B5906FFECAFD9A7B44" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> City Area Code </link:label>
<link:label id="lab_dei_CityAreaCode_07C876DE2A80D6B5906FFECAFD9A7B44_label_en-US" xlink:label="lab_dei_CityAreaCode_07C876DE2A80D6B5906FFECAFD9A7B44" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> City Area Code </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_CityAreaCode" xlink:label="loc_dei_CityAreaCode_07C876DE2A80D6B5906FFECAFD9A7B44" xlink:type="locator"/>
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<link:label id="lab_dei_LocalPhoneNumber_56B3142F40ACD7B35B6CFECAFD9B28EE_terseLabel_en-US" xlink:label="lab_dei_LocalPhoneNumber_56B3142F40ACD7B35B6CFECAFD9B28EE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Local Phone Number </link:label>
<link:label id="lab_dei_LocalPhoneNumber_56B3142F40ACD7B35B6CFECAFD9B28EE_label_en-US" xlink:label="lab_dei_LocalPhoneNumber_56B3142F40ACD7B35B6CFECAFD9B28EE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Local Phone Number </link:label>
<link:loc xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_LocalPhoneNumber" xlink:label="loc_dei_LocalPhoneNumber_56B3142F40ACD7B35B6CFECAFD9B28EE" xlink:type="locator"/>
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<link:label id="lab_dei_Security12bTitle_8F658216B9F8DA70136BFECAFD9C0753_terseLabel_en-US" xlink:label="lab_dei_Security12bTitle_8F658216B9F8DA70136BFECAFD9C0753" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Title of 12(b) Security </link:label>
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<link:label id="lab_dei_EntityEmergingGrowthCompany_BCB1951BE82F2AF38466FECAFD9C9D8A_terseLabel_en-US" xlink:label="lab_dei_EntityEmergingGrowthCompany_BCB1951BE82F2AF38466FECAFD9C9D8A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Entity Emerging Growth Company </link:label>
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<link:label id="lab_us-gaap_StatementOfCashFlowsAbstract_ED9DE27D5239B4CE21BD04186BD2CDE0_label_en-US" xlink:label="lab_us-gaap_StatementOfCashFlowsAbstract_ED9DE27D5239B4CE21BD04186BD2CDE0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Statement of Cash Flows [Abstract] </link:label>
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<link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_44F279FCBA39CD6FE1EF04186BD3451C_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_44F279FCBA39CD6FE1EF04186BD3451C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Adjustments to reconcile net income to cash provided by operating activities: </link:label>
<link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_44F279FCBA39CD6FE1EF04186BD3451C_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_44F279FCBA39CD6FE1EF04186BD3451C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_44F279FCBA39CD6FE1EF04186BD3451C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_44F279FCBA39CD6FE1EF04186BD3451C" xlink:to="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_44F279FCBA39CD6FE1EF04186BD3451C" xlink:type="arc"/>
<link:label id="lab_us-gaap_DepreciationAndAmortization_F2D06CAC9E3DEDC17ED204186BD4AFEB_terseLabel_en-US" xlink:label="lab_us-gaap_DepreciationAndAmortization_F2D06CAC9E3DEDC17ED204186BD4AFEB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Depreciation and amortization </link:label>
<link:label id="lab_us-gaap_DepreciationAndAmortization_F2D06CAC9E3DEDC17ED204186BD4AFEB_label_en-US" xlink:label="lab_us-gaap_DepreciationAndAmortization_F2D06CAC9E3DEDC17ED204186BD4AFEB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Depreciation, Depletion and Amortization, Nonproduction </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="loc_us-gaap_DepreciationAndAmortization_F2D06CAC9E3DEDC17ED204186BD4AFEB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DepreciationAndAmortization_F2D06CAC9E3DEDC17ED204186BD4AFEB" xlink:to="lab_us-gaap_DepreciationAndAmortization_F2D06CAC9E3DEDC17ED204186BD4AFEB" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensation_DE982CD70758885F7AF604186BD4B75C_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_DE982CD70758885F7AF604186BD4B75C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock-based compensation expense </link:label>
<link:label id="lab_us-gaap_ShareBasedCompensation_DE982CD70758885F7AF604186BD4B75C_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_DE982CD70758885F7AF604186BD4B75C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement, Noncash Expense </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_DE982CD70758885F7AF604186BD4B75C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensation_DE982CD70758885F7AF604186BD4B75C" xlink:to="lab_us-gaap_ShareBasedCompensation_DE982CD70758885F7AF604186BD4B75C" xlink:type="arc"/>
<link:label id="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_690BCD766A3563E7301E04186BD44AFF_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_690BCD766A3563E7301E04186BD44AFF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred taxes </link:label>
<link:label id="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_690BCD766A3563E7301E04186BD44AFF_label_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_690BCD766A3563E7301E04186BD44AFF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Deferred Income Tax Expense (Benefit) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_690BCD766A3563E7301E04186BD44AFF" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_690BCD766A3563E7301E04186BD44AFF" xlink:to="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_690BCD766A3563E7301E04186BD44AFF" xlink:type="arc"/>
<link:label id="lab_us-gaap_GainLossOnSaleOfBusiness_E86059C6329BDB2A489A04186BD56A8A_negatedLabel_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfBusiness_E86059C6329BDB2A489A04186BD56A8A" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Loss (gain) from divested operations </link:label>
<link:label id="lab_us-gaap_GainLossOnSaleOfBusiness_E86059C6329BDB2A489A04186BD56A8A_label_en-US" xlink:label="lab_us-gaap_GainLossOnSaleOfBusiness_E86059C6329BDB2A489A04186BD56A8A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Gain (Loss) on Disposition of Business </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GainLossOnSaleOfBusiness" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_E86059C6329BDB2A489A04186BD56A8A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_GainLossOnSaleOfBusiness_E86059C6329BDB2A489A04186BD56A8A" xlink:to="lab_us-gaap_GainLossOnSaleOfBusiness_E86059C6329BDB2A489A04186BD56A8A" xlink:type="arc"/>
<link:label id="lab_us-gaap_EquitySecuritiesFvNiUnrealizedGain_2C2A53D1E9172318DC5204186BD5BA3E_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_EquitySecuritiesFvNiUnrealizedGain_2C2A53D1E9172318DC5204186BD5BA3E" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Fair value adjustment - equity security </link:label>
<link:label id="lab_us-gaap_EquitySecuritiesFvNiUnrealizedGain_2C2A53D1E9172318DC5204186BD5BA3E_label_en-US" xlink:label="lab_us-gaap_EquitySecuritiesFvNiUnrealizedGain_2C2A53D1E9172318DC5204186BD5BA3E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Equity Securities, FV-NI, Unrealized Gain </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquitySecuritiesFvNiUnrealizedGain" xlink:label="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGain_2C2A53D1E9172318DC5204186BD5BA3E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGain_2C2A53D1E9172318DC5204186BD5BA3E" xlink:to="lab_us-gaap_EquitySecuritiesFvNiUnrealizedGain_2C2A53D1E9172318DC5204186BD5BA3E" xlink:type="arc"/>
<link:label id="lab_it_OperatingLeaseRightOfUseAssetAmortization_40944D41275320C18C4304186BD5D291_verboseLabel_en-US" xlink:label="lab_it_OperatingLeaseRightOfUseAssetAmortization_40944D41275320C18C4304186BD5D291" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Amortization of lease right-of-use assets </link:label>
<link:label id="lab_it_OperatingLeaseRightOfUseAssetAmortization_40944D41275320C18C4304186BD5D291_label_en-US" xlink:label="lab_it_OperatingLeaseRightOfUseAssetAmortization_40944D41275320C18C4304186BD5D291" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Right-Of-Use Asset, Amortization </link:label>
<link:label id="lab_it_OperatingLeaseRightOfUseAssetAmortization_40944D41275320C18C4304186BD5D291_documentation_en-US" xlink:label="lab_it_OperatingLeaseRightOfUseAssetAmortization_40944D41275320C18C4304186BD5D291" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Operating Lease, Right-Of-Use Asset, Amortization </link:label>
<link:loc xlink:href="it-20190930.xsd#it_OperatingLeaseRightOfUseAssetAmortization" xlink:label="loc_it_OperatingLeaseRightOfUseAssetAmortization_40944D41275320C18C4304186BD5D291" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_OperatingLeaseRightOfUseAssetAmortization_40944D41275320C18C4304186BD5D291" xlink:to="lab_it_OperatingLeaseRightOfUseAssetAmortization_40944D41275320C18C4304186BD5D291" xlink:type="arc"/>
<link:label id="lab_us-gaap_AmortizationOfFinancingCosts_3266874EC98D7C3FFCE904186BD5F4FF_terseLabel_en-US" xlink:label="lab_us-gaap_AmortizationOfFinancingCosts_3266874EC98D7C3FFCE904186BD5F4FF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Amortization and write-off of deferred financing fees </link:label>
<link:label id="lab_us-gaap_AmortizationOfFinancingCosts_3266874EC98D7C3FFCE904186BD5F4FF_label_en-US" xlink:label="lab_us-gaap_AmortizationOfFinancingCosts_3266874EC98D7C3FFCE904186BD5F4FF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Amortization of Debt Issuance Costs </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AmortizationOfFinancingCosts" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_3266874EC98D7C3FFCE904186BD5F4FF" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AmortizationOfFinancingCosts_3266874EC98D7C3FFCE904186BD5F4FF" xlink:to="lab_us-gaap_AmortizationOfFinancingCosts_3266874EC98D7C3FFCE904186BD5F4FF" xlink:type="arc"/>
<link:label id="lab_it_IncreaseDecreaseInOperatingCapitalNetOfAcquisitionAbstract_C583F95901E059B7425104186BD5C38A_terseLabel_en-US" xlink:label="lab_it_IncreaseDecreaseInOperatingCapitalNetOfAcquisitionAbstract_C583F95901E059B7425104186BD5C38A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Changes in assets and liabilities, net of divestitures: </link:label>
<link:label id="lab_it_IncreaseDecreaseInOperatingCapitalNetOfAcquisitionAbstract_C583F95901E059B7425104186BD5C38A_label_en-US" xlink:label="lab_it_IncreaseDecreaseInOperatingCapitalNetOfAcquisitionAbstract_C583F95901E059B7425104186BD5C38A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Operating Capital, Net of Acquisition [Abstract] </link:label>
<link:label id="lab_it_IncreaseDecreaseInOperatingCapitalNetOfAcquisitionAbstract_C583F95901E059B7425104186BD5C38A_documentation_en-US" xlink:label="lab_it_IncreaseDecreaseInOperatingCapitalNetOfAcquisitionAbstract_C583F95901E059B7425104186BD5C38A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> -- None. No documentation exists for this element. -- </link:label>
<link:loc xlink:href="it-20190930.xsd#it_IncreaseDecreaseInOperatingCapitalNetOfAcquisitionAbstract" xlink:label="loc_it_IncreaseDecreaseInOperatingCapitalNetOfAcquisitionAbstract_C583F95901E059B7425104186BD5C38A" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_IncreaseDecreaseInOperatingCapitalNetOfAcquisitionAbstract_C583F95901E059B7425104186BD5C38A" xlink:to="lab_it_IncreaseDecreaseInOperatingCapitalNetOfAcquisitionAbstract_C583F95901E059B7425104186BD5C38A" xlink:type="arc"/>
<link:label id="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_09D7A808169D3BC3646B04186BD6681C_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_09D7A808169D3BC3646B04186BD6681C" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Fees receivable, net </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_09D7A808169D3BC3646B04186BD6681C_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_09D7A808169D3BC3646B04186BD6681C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Accounts Receivable </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_09D7A808169D3BC3646B04186BD6681C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_09D7A808169D3BC3646B04186BD6681C" xlink:to="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_09D7A808169D3BC3646B04186BD6681C" xlink:type="arc"/>
<link:label id="lab_us-gaap_IncreaseDecreaseInDeferredCharges_D6A41F3A1FB90F32D37704186BD65F50_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDeferredCharges_D6A41F3A1FB90F32D37704186BD65F50" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Deferred commissions </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInDeferredCharges_D6A41F3A1FB90F32D37704186BD65F50_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDeferredCharges_D6A41F3A1FB90F32D37704186BD65F50" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Deferred Charges </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredCharges" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredCharges_D6A41F3A1FB90F32D37704186BD65F50" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_418906F4630A6543BD3304186BD6398C_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_418906F4630A6543BD3304186BD6398C" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Prepaid expenses and other current assets </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_418906F4630A6543BD3304186BD6398C_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_418906F4630A6543BD3304186BD6398C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Prepaid Expense and Other Assets </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_418906F4630A6543BD3304186BD6398C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_7212F9E1E1DFFB65E69604186BD69CC6_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_7212F9E1E1DFFB65E69604186BD69CC6" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Other assets </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_7212F9E1E1DFFB65E69604186BD69CC6_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherOperatingAssets_7212F9E1E1DFFB65E69604186BD69CC6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Other Operating Assets </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_7212F9E1E1DFFB65E69604186BD69CC6" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncreaseDecreaseInDeferredRevenue_8FAC94B4511D7352ACEB04186BD70125_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDeferredRevenue_8FAC94B4511D7352ACEB04186BD70125" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred revenues </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInDeferredRevenue_8FAC94B4511D7352ACEB04186BD70125_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDeferredRevenue_8FAC94B4511D7352ACEB04186BD70125" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Deferred Revenue </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredRevenue" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredRevenue_8FAC94B4511D7352ACEB04186BD70125" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_D452777069E72AEA3FEE04186BD73FE9_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_D452777069E72AEA3FEE04186BD73FE9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accounts payable, accrued, and other liabilities </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_D452777069E72AEA3FEE04186BD73FE9_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_D452777069E72AEA3FEE04186BD73FE9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Accounts Payable and Accrued Liabilities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_D452777069E72AEA3FEE04186BD73FE9" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_D452777069E72AEA3FEE04186BD73FE9" xlink:to="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_D452777069E72AEA3FEE04186BD73FE9" xlink:type="arc"/>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_F18F7E30B20659F382B004186BD7E1AB_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_F18F7E30B20659F382B004186BD7E1AB" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Cash provided by operating activities </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_F18F7E30B20659F382B004186BD7E1AB_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_F18F7E30B20659F382B004186BD7E1AB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Operating Activities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_F18F7E30B20659F382B004186BD7E1AB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_F18F7E30B20659F382B004186BD7E1AB" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_F18F7E30B20659F382B004186BD7E1AB" xlink:type="arc"/>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_37C7C3FFBCEFA76C179C04186BD7E374_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_37C7C3FFBCEFA76C179C04186BD7E374" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Investing activities: </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_37C7C3FFBCEFA76C179C04186BD7E374_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_37C7C3FFBCEFA76C179C04186BD7E374" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Investing Activities [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_37C7C3FFBCEFA76C179C04186BD7E374" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_37C7C3FFBCEFA76C179C04186BD7E374" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_37C7C3FFBCEFA76C179C04186BD7E374" xlink:type="arc"/>
<link:label id="lab_us-gaap_PaymentsForCapitalImprovements_5CEAD4F74A61FEAEC70604186BD7BA3F_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsForCapitalImprovements_5CEAD4F74A61FEAEC70604186BD7BA3F" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Additions to property, equipment and leasehold improvements </link:label>
<link:label id="lab_us-gaap_PaymentsForCapitalImprovements_5CEAD4F74A61FEAEC70604186BD7BA3F_label_en-US" xlink:label="lab_us-gaap_PaymentsForCapitalImprovements_5CEAD4F74A61FEAEC70604186BD7BA3F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments for Capital Improvements </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsForCapitalImprovements" xlink:label="loc_us-gaap_PaymentsForCapitalImprovements_5CEAD4F74A61FEAEC70604186BD7BA3F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsForCapitalImprovements_5CEAD4F74A61FEAEC70604186BD7BA3F" xlink:to="lab_us-gaap_PaymentsForCapitalImprovements_5CEAD4F74A61FEAEC70604186BD7BA3F" xlink:type="arc"/>
<link:label id="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_72D330C85A7BA13A507104186BD87056_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_72D330C85A7BA13A507104186BD87056" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Acquisitions - cash paid </link:label>
<link:label id="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_72D330C85A7BA13A507104186BD87056_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_72D330C85A7BA13A507104186BD87056" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Payments to Acquire Businesses, Net of Cash Acquired </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_72D330C85A7BA13A507104186BD87056" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_72D330C85A7BA13A507104186BD87056" xlink:to="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_72D330C85A7BA13A507104186BD87056" xlink:type="arc"/>
<link:label id="lab_us-gaap_ProceedsFromDivestitureOfBusinesses_A9CEA650D16F32CCC05A04186BD8FD4D_verboseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromDivestitureOfBusinesses_A9CEA650D16F32CCC05A04186BD8FD4D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Divestitures - cash received (net of cash transferred) </link:label>
<link:label id="lab_us-gaap_ProceedsFromDivestitureOfBusinesses_A9CEA650D16F32CCC05A04186BD8FD4D_label_en-US" xlink:label="lab_us-gaap_ProceedsFromDivestitureOfBusinesses_A9CEA650D16F32CCC05A04186BD8FD4D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from Divestiture of Businesses </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_A9CEA650D16F32CCC05A04186BD8FD4D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_A9CEA650D16F32CCC05A04186BD8FD4D" xlink:to="lab_us-gaap_ProceedsFromDivestitureOfBusinesses_A9CEA650D16F32CCC05A04186BD8FD4D" xlink:type="arc"/>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_0C46D384E1CEDF29293C04186BD89C6B_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_0C46D384E1CEDF29293C04186BD89C6B" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Cash (used in) provided by investing activities </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_0C46D384E1CEDF29293C04186BD89C6B_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_0C46D384E1CEDF29293C04186BD89C6B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Investing Activities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_0C46D384E1CEDF29293C04186BD89C6B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_0C46D384E1CEDF29293C04186BD89C6B" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_0C46D384E1CEDF29293C04186BD89C6B" xlink:type="arc"/>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_CCE5836BCF6159F97D7F04186BD98F9F_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_CCE5836BCF6159F97D7F04186BD98F9F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Financing activities: </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_CCE5836BCF6159F97D7F04186BD98F9F_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_CCE5836BCF6159F97D7F04186BD98F9F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Financing Activities [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_CCE5836BCF6159F97D7F04186BD98F9F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_CCE5836BCF6159F97D7F04186BD98F9F" xlink:to="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_CCE5836BCF6159F97D7F04186BD98F9F" xlink:type="arc"/>
<link:label id="lab_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_32451ABE7FAB6580E2E904186BD98B76_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_32451ABE7FAB6580E2E904186BD98B76" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Proceeds from employee stock purchase plan </link:label>
<link:label id="lab_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_32451ABE7FAB6580E2E904186BD98B76_label_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_32451ABE7FAB6580E2E904186BD98B76" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds, Issuance of Shares, Share-based Payment Arrangement, Including Option Exercised </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_32451ABE7FAB6580E2E904186BD98B76" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_32451ABE7FAB6580E2E904186BD98B76" xlink:to="lab_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_32451ABE7FAB6580E2E904186BD98B76" xlink:type="arc"/>
<link:label id="lab_us-gaap_ProceedsFromIssuanceOfLongTermDebt_FBB6E1E59FEB5430D97F04186BD96BDE_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfLongTermDebt_FBB6E1E59FEB5430D97F04186BD96BDE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Proceeds from borrowings </link:label>
<link:label id="lab_us-gaap_ProceedsFromIssuanceOfLongTermDebt_FBB6E1E59FEB5430D97F04186BD96BDE_label_en-US" xlink:label="lab_us-gaap_ProceedsFromIssuanceOfLongTermDebt_FBB6E1E59FEB5430D97F04186BD96BDE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Proceeds from Issuance of Long-term Debt </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_FBB6E1E59FEB5430D97F04186BD96BDE" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_FBB6E1E59FEB5430D97F04186BD96BDE" xlink:to="lab_us-gaap_ProceedsFromIssuanceOfLongTermDebt_FBB6E1E59FEB5430D97F04186BD96BDE" xlink:type="arc"/>
<link:label id="lab_us-gaap_RepaymentsOfLongTermDebt_160B16913F218D0D9F2604186BD91406_negatedLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfLongTermDebt_160B16913F218D0D9F2604186BD91406" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Payments on borrowings </link:label>
<link:label id="lab_us-gaap_RepaymentsOfLongTermDebt_160B16913F218D0D9F2604186BD91406_label_en-US" xlink:label="lab_us-gaap_RepaymentsOfLongTermDebt_160B16913F218D0D9F2604186BD91406" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Repayments of Long-term Debt </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_160B16913F218D0D9F2604186BD91406" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_DC182337F824075E717A04186BD9B40D_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_DC182337F824075E717A04186BD9B40D" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Purchases of treasury stock </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_DC182337F824075E717A04186BD9B40D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_DC182337F824075E717A04186BD9B40D" xlink:to="lab_us-gaap_PaymentsForRepurchaseOfCommonStock_DC182337F824075E717A04186BD9B40D" xlink:type="arc"/>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_D9C4D55B93532123BB0E04186BDAC1C1_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_D9C4D55B93532123BB0E04186BDAC1C1" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Cash used in financing activities </link:label>
<link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_D9C4D55B93532123BB0E04186BDAC1C1_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_D9C4D55B93532123BB0E04186BDAC1C1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Net Cash Provided by (Used in) Financing Activities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_D9C4D55B93532123BB0E04186BDAC1C1" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_D9C4D55B93532123BB0E04186BDAC1C1" xlink:to="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_D9C4D55B93532123BB0E04186BDAC1C1" xlink:type="arc"/>
<link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_F7A27E395F168A8695A104186BDAE241_totalLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_F7A27E395F168A8695A104186BDAE241" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net increase (decrease) in cash and cash equivalents and restricted cash </link:label>
<link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_F7A27E395F168A8695A104186BDAE241_label_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_F7A27E395F168A8695A104186BDAE241" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_F7A27E395F168A8695A104186BDAE241" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_C77D88D334DD9382EF33E1AE00B03CC6_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock_CF5FCE5E687057DE8B23395D84D9EAA8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule for Contract with Customer, Asset and Liability </link:label>
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<link:label id="lab_us-gaap_LeaseCostTableTextBlock_5E9192198F21C7A4D41BE1AE00B0FBFA_terseLabel_en-US" xlink:label="lab_us-gaap_LeaseCostTableTextBlock_9E17C68E708F5E679248792534592E75" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Lease costs </link:label>
<link:label id="lab_us-gaap_LeaseCostTableTextBlock_5E9192198F21C7A4D41BE1AE00B0FBFA_label_en-US" xlink:label="lab_us-gaap_LeaseCostTableTextBlock_9E17C68E708F5E679248792534592E75" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lease, Cost [Table Text Block] </link:label>
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<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_9D061D8C4CB79D21DA6CE1AE00B0A344_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_1A441937A4B45BC990BB5A528E8A6628" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating lease maturity schedule </link:label>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_9D061D8C4CB79D21DA6CE1AE00B0A344_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_1A441937A4B45BC990BB5A528E8A6628" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Liability, Maturity [Table Text Block] </link:label>
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<link:label id="lab_it_AssetsAndLiabilitiesLeasesTableTextBlock_0B8D081633ADBA3D2F78E1AE00B17D58_terseLabel_en-US" xlink:label="lab_it_AssetsAndLiabilitiesLeasesTableTextBlock_D51D9704AEC35716A6812956E7D504FD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Supplemental balance sheet information </link:label>
<link:label id="lab_it_AssetsAndLiabilitiesLeasesTableTextBlock_0B8D081633ADBA3D2F78E1AE00B17D58_label_en-US" xlink:label="lab_it_AssetsAndLiabilitiesLeasesTableTextBlock_D51D9704AEC35716A6812956E7D504FD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets And Liabilities, Leases [Table Text Block] </link:label>
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<link:loc xlink:href="it-20190930.xsd#it_AssetsAndLiabilitiesLeasesTableTextBlock" xlink:label="loc_it_AssetsAndLiabilitiesLeasesTableTextBlock_D51D9704AEC35716A6812956E7D504FD" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ScheduleOfFutureMinimumLeasePaymentsForCapitalLeasesTableTextBlock_82BFF6DAC8385EE5F254E1AE00B1008C_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfFutureMinimumLeasePaymentsForCapitalLeasesTableTextBlock_2443B28C2D755B588B439CC7C2A4DD5F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of Future Minimum Lease Payments for Capital Leases </link:label>
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<link:label id="lab_us-gaap_FairValueDisclosuresAbstract_EFC9C2789A2E82506DEEB8A6BB540AEA_label_en-US" xlink:label="lab_us-gaap_FairValueDisclosuresAbstract_0C9048E17B8B564CBD9F03145A70F02E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value Disclosures [Abstract] </link:label>
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<link:label id="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_815B763430FB1505A5AAB8A6BB56CD67_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_8302F86FF70F5142BD68F8E843229006" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value Hierarchy and NAV [Axis] </link:label>
<link:label id="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_815B763430FB1505A5AAB8A6BB56CD67_label_en-US" xlink:label="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_8302F86FF70F5142BD68F8E843229006" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value Hierarchy and NAV [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_8302F86FF70F5142BD68F8E843229006" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_8302F86FF70F5142BD68F8E843229006" xlink:to="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_8302F86FF70F5142BD68F8E843229006" xlink:type="arc"/>
<link:label id="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_85E6742CA5F56FE63636B8A6BB5626F5_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_69B00A9D6C455F88B579F68B175B6E5F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value Hierarchy and NAV [Domain] </link:label>
<link:label id="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_85E6742CA5F56FE63636B8A6BB5626F5_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_69B00A9D6C455F88B579F68B175B6E5F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value Hierarchy and NAV [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_69B00A9D6C455F88B579F68B175B6E5F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_69B00A9D6C455F88B579F68B175B6E5F" xlink:to="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_69B00A9D6C455F88B579F68B175B6E5F" xlink:type="arc"/>
<link:label id="lab_us-gaap_FairValueInputsLevel1Member_8F8008163298AC358A21B8A6BB575EA3_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel1Member_31DA4ED609685E0C89AF2A676FE41F57" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value, Inputs, Level 1 </link:label>
<link:label id="lab_us-gaap_FairValueInputsLevel1Member_8F8008163298AC358A21B8A6BB575EA3_label_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel1Member_31DA4ED609685E0C89AF2A676FE41F57" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value, Inputs, Level 1 [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_31DA4ED609685E0C89AF2A676FE41F57" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueInputsLevel1Member_31DA4ED609685E0C89AF2A676FE41F57" xlink:to="lab_us-gaap_FairValueInputsLevel1Member_31DA4ED609685E0C89AF2A676FE41F57" xlink:type="arc"/>
<link:label id="lab_us-gaap_FairValueInputsLevel2Member_1D2CD75BC6760EEB7014B8A6BB578E83_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel2Member_B57FC900F28058449FA71848BD733FEA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value, Inputs, Level 2 </link:label>
<link:label id="lab_us-gaap_FairValueInputsLevel2Member_1D2CD75BC6760EEB7014B8A6BB578E83_label_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel2Member_B57FC900F28058449FA71848BD733FEA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value, Inputs, Level 2 [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_B57FC900F28058449FA71848BD733FEA" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueInputsLevel2Member_B57FC900F28058449FA71848BD733FEA" xlink:to="lab_us-gaap_FairValueInputsLevel2Member_B57FC900F28058449FA71848BD733FEA" xlink:type="arc"/>
<link:label id="lab_us-gaap_FinancialInstrumentAxis_1B89DB5B526A0ED9AFBBB8A6BB570F81_terseLabel_en-US" xlink:label="lab_us-gaap_FinancialInstrumentAxis_CEEC313BF83C5B208DFB0E75567BA75D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Financial Instrument [Axis] </link:label>
<link:label id="lab_us-gaap_FinancialInstrumentAxis_1B89DB5B526A0ED9AFBBB8A6BB570F81_label_en-US" xlink:label="lab_us-gaap_FinancialInstrumentAxis_CEEC313BF83C5B208DFB0E75567BA75D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Financial Instrument [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="loc_us-gaap_FinancialInstrumentAxis_CEEC313BF83C5B208DFB0E75567BA75D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FinancialInstrumentAxis_CEEC313BF83C5B208DFB0E75567BA75D" xlink:to="lab_us-gaap_FinancialInstrumentAxis_CEEC313BF83C5B208DFB0E75567BA75D" xlink:type="arc"/>
<link:label id="lab_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_34CA2A7808505467B523B8A6BB584967_terseLabel_en-US" xlink:label="lab_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_393AF4232F7B5697B63E7DA441C24BD5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Types of Financial Instruments [Domain] </link:label>
<link:label id="lab_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_34CA2A7808505467B523B8A6BB584967_label_en-US" xlink:label="lab_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_393AF4232F7B5697B63E7DA441C24BD5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Financial Instruments [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_393AF4232F7B5697B63E7DA441C24BD5" xlink:type="locator"/>
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<link:label id="lab_it_PlanAssetsMember_E6EF987FC6C600E5510EB8A6BB58520F_terseLabel_en-US" xlink:label="lab_it_PlanAssetsMember_597D2FBA8CCA597C8E4CB1B53BB77485" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred compensation plan assets </link:label>
<link:label id="lab_it_PlanAssetsMember_E6EF987FC6C600E5510EB8A6BB58520F_label_en-US" xlink:label="lab_it_PlanAssetsMember_597D2FBA8CCA597C8E4CB1B53BB77485" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Plan Assets [Member] </link:label>
<link:label id="lab_it_PlanAssetsMember_E6EF987FC6C600E5510EB8A6BB58520F_documentation_en-US" xlink:label="lab_it_PlanAssetsMember_597D2FBA8CCA597C8E4CB1B53BB77485" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> -- None. No documentation exists for this element. -- </link:label>
<link:loc xlink:href="it-20190930.xsd#it_PlanAssetsMember" xlink:label="loc_it_PlanAssetsMember_597D2FBA8CCA597C8E4CB1B53BB77485" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_PlanAssetsMember_597D2FBA8CCA597C8E4CB1B53BB77485" xlink:to="lab_it_PlanAssetsMember_597D2FBA8CCA597C8E4CB1B53BB77485" xlink:type="arc"/>
<link:label id="lab_it_PlanLiabilitiesMember_0D874F9924AB0E4472F9B8A6BB584FF0_terseLabel_en-US" xlink:label="lab_it_PlanLiabilitiesMember_565D187B9A58538D9A61A205FCA3D777" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred compensation plan liabilities </link:label>
<link:label id="lab_it_PlanLiabilitiesMember_0D874F9924AB0E4472F9B8A6BB584FF0_label_en-US" xlink:label="lab_it_PlanLiabilitiesMember_565D187B9A58538D9A61A205FCA3D777" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Plan Liabilities [Member] </link:label>
<link:label id="lab_it_PlanLiabilitiesMember_0D874F9924AB0E4472F9B8A6BB584FF0_documentation_en-US" xlink:label="lab_it_PlanLiabilitiesMember_565D187B9A58538D9A61A205FCA3D777" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> -- None. No documentation exists for this element. -- </link:label>
<link:loc xlink:href="it-20190930.xsd#it_PlanLiabilitiesMember" xlink:label="loc_it_PlanLiabilitiesMember_565D187B9A58538D9A61A205FCA3D777" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_PlanLiabilitiesMember_565D187B9A58538D9A61A205FCA3D777" xlink:to="lab_it_PlanLiabilitiesMember_565D187B9A58538D9A61A205FCA3D777" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtMember_3E19DD8D93F970E52018B8A6BB59F755_terseLabel_en-US" xlink:label="lab_us-gaap_DebtMember_9CCA14793C1251F3B6EEAE1561A71AAA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Senior notes </link:label>
<link:label id="lab_us-gaap_DebtMember_3E19DD8D93F970E52018B8A6BB59F755_label_en-US" xlink:label="lab_us-gaap_DebtMember_9CCA14793C1251F3B6EEAE1561A71AAA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtMember" xlink:label="loc_us-gaap_DebtMember_9CCA14793C1251F3B6EEAE1561A71AAA" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtMember_9CCA14793C1251F3B6EEAE1561A71AAA" xlink:to="lab_us-gaap_DebtMember_9CCA14793C1251F3B6EEAE1561A71AAA" xlink:type="arc"/>
<link:label id="lab_us-gaap_ForeignExchangeForwardMember_7169C10C541C105563D7B8A6BB5956BD_verboseLabel_en-US" xlink:label="lab_us-gaap_ForeignExchangeForwardMember_B74B67F77D53527EA9E3B3BE4DC7C1F0" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Foreign currency forward contracts </link:label>
<link:label id="lab_us-gaap_ForeignExchangeForwardMember_7169C10C541C105563D7B8A6BB5956BD_label_en-US" xlink:label="lab_us-gaap_ForeignExchangeForwardMember_B74B67F77D53527EA9E3B3BE4DC7C1F0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Foreign Exchange Forward [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignExchangeForwardMember" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_B74B67F77D53527EA9E3B3BE4DC7C1F0" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ForeignExchangeForwardMember_B74B67F77D53527EA9E3B3BE4DC7C1F0" xlink:to="lab_us-gaap_ForeignExchangeForwardMember_B74B67F77D53527EA9E3B3BE4DC7C1F0" xlink:type="arc"/>
<link:label id="lab_us-gaap_InterestRateSwapMember_263CB712BB18A894286BB8A6BB5A4FAD_verboseLabel_en-US" xlink:label="lab_us-gaap_InterestRateSwapMember_6265DECA47ED5D1CBB0A55BAD0EC2F2D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Interest rate swap contracts </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestRateSwapMember" xlink:label="loc_us-gaap_InterestRateSwapMember_6265DECA47ED5D1CBB0A55BAD0EC2F2D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestRateSwapMember_6265DECA47ED5D1CBB0A55BAD0EC2F2D" xlink:to="lab_us-gaap_InterestRateSwapMember_6265DECA47ED5D1CBB0A55BAD0EC2F2D" xlink:type="arc"/>
<link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2DAFB5CDA9475CDFD687B8A6BB5A8A1D_label_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2D86F063C08852E897E8A3DE6AB6CF08" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2D86F063C08852E897E8A3DE6AB6CF08" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AssetsFairValueDisclosureAbstract_D7431F452BD09C3660C9B8A6BB5A973A_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsFairValueDisclosureAbstract_81633E11472654C999B425C0FC905311" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Assets: </link:label>
<link:label id="lab_us-gaap_AssetsFairValueDisclosureAbstract_D7431F452BD09C3660C9B8A6BB5A973A_label_en-US" xlink:label="lab_us-gaap_AssetsFairValueDisclosureAbstract_81633E11472654C999B425C0FC905311" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets, Fair Value Disclosure [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsFairValueDisclosureAbstract" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_81633E11472654C999B425C0FC905311" xlink:type="locator"/>
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<link:label id="lab_us-gaap_AssetsFairValueDisclosure_0BD0C41C9F58BEF95888B8A6BB5BB32A_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsFairValueDisclosure_A0C31ECE59BC5365934B444625C1F2CE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Assets measured at fair value on a recurring basis </link:label>
<link:label id="lab_us-gaap_AssetsFairValueDisclosure_0BD0C41C9F58BEF95888B8A6BB5BB32A_label_en-US" xlink:label="lab_us-gaap_AssetsFairValueDisclosure_A0C31ECE59BC5365934B444625C1F2CE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Assets, Fair Value Disclosure </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsFairValueDisclosure" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_A0C31ECE59BC5365934B444625C1F2CE" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LiabilitiesFairValueDisclosureAbstract_BA129874A2EC5099E066B8A6BB5B99AA_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesFairValueDisclosureAbstract_F7645857729451FFAEFBBDA15F8AD1FA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Liabilities: </link:label>
<link:label id="lab_us-gaap_LiabilitiesFairValueDisclosureAbstract_BA129874A2EC5099E066B8A6BB5B99AA_label_en-US" xlink:label="lab_us-gaap_LiabilitiesFairValueDisclosureAbstract_F7645857729451FFAEFBBDA15F8AD1FA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Liabilities, Fair Value Disclosure [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_F7645857729451FFAEFBBDA15F8AD1FA" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PreferredStockSharesIssued_B670F3FCCDB294AE60F004186C038414_terseLabel_en-US" xlink:label="lab_us-gaap_PreferredStockSharesIssued_B670F3FCCDB294AE60F004186C038414" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Preferred stock, shares issued (in shares) </link:label>
<link:label id="lab_us-gaap_PreferredStockSharesIssued_B670F3FCCDB294AE60F004186C038414_label_en-US" xlink:label="lab_us-gaap_PreferredStockSharesIssued_B670F3FCCDB294AE60F004186C038414" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Preferred Stock, Shares Issued </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="loc_us-gaap_PreferredStockSharesIssued_B670F3FCCDB294AE60F004186C038414" xlink:type="locator"/>
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<link:label id="lab_us-gaap_PreferredStockSharesOutstanding_E5CDF3B2061661822AA004186C03DDC0_terseLabel_en-US" xlink:label="lab_us-gaap_PreferredStockSharesOutstanding_E5CDF3B2061661822AA004186C03DDC0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Preferred stock, shares outstanding (in shares) </link:label>
<link:label id="lab_us-gaap_PreferredStockSharesOutstanding_E5CDF3B2061661822AA004186C03DDC0_label_en-US" xlink:label="lab_us-gaap_PreferredStockSharesOutstanding_E5CDF3B2061661822AA004186C03DDC0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Preferred Stock, Shares Outstanding </link:label>
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<link:label id="lab_us-gaap_CommonStockParOrStatedValuePerShare_FA113CF19119BAD67C0904186C03FC25_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockParOrStatedValuePerShare_FA113CF19119BAD67C0904186C03FC25" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Common stock, par value (in dollars per share) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_FA113CF19119BAD67C0904186C03FC25" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CommonStockSharesAuthorized_147DC3717284863AB21304186C04D1CF_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesAuthorized_147DC3717284863AB21304186C04D1CF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Common stock, shares authorized (in shares) </link:label>
<link:label id="lab_us-gaap_CommonStockSharesAuthorized_147DC3717284863AB21304186C04D1CF_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesAuthorized_147DC3717284863AB21304186C04D1CF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock, Shares Authorized </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_147DC3717284863AB21304186C04D1CF" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CommonStockSharesIssued_493580F79A001EA9C0F204186C046CF7_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesIssued_493580F79A001EA9C0F204186C046CF7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Common stock, shares issued (in shares) </link:label>
<link:label id="lab_us-gaap_CommonStockSharesIssued_493580F79A001EA9C0F204186C046CF7_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesIssued_493580F79A001EA9C0F204186C046CF7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Common Stock, Shares, Issued </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaap_CommonStockSharesIssued_493580F79A001EA9C0F204186C046CF7" xlink:type="locator"/>
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<link:label id="lab_us-gaap_TreasuryStockShares_D3DA06339DE787B1C5A604186C045C4F_terseLabel_en-US" xlink:label="lab_us-gaap_TreasuryStockShares_D3DA06339DE787B1C5A604186C045C4F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Treasury stock, common shares (in shares) </link:label>
<link:label id="lab_us-gaap_TreasuryStockShares_D3DA06339DE787B1C5A604186C045C4F_label_en-US" xlink:label="lab_us-gaap_TreasuryStockShares_D3DA06339DE787B1C5A604186C045C4F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Treasury Stock, Shares </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TreasuryStockShares" xlink:label="loc_us-gaap_TreasuryStockShares_D3DA06339DE787B1C5A604186C045C4F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CompensationAndRetirementDisclosureAbstract_D32DEE0198CDDD076909D5CF3637ACC6_label_en-US" xlink:label="lab_us-gaap_CompensationAndRetirementDisclosureAbstract_D32DEE0198CDDD076909D5CF3637ACC6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Retirement Benefits [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_D32DEE0198CDDD076909D5CF3637ACC6" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_125B1B572D6B093388DED5CF3637E960_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_125B1B572D6B093388DED5CF3637E960" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Net periodic pension expense </link:label>
<link:label id="lab_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_125B1B572D6B093388DED5CF3637E960_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_125B1B572D6B093388DED5CF3637E960" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Defined Benefit Plan, Net Periodic Benefit Cost (Credit) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_125B1B572D6B093388DED5CF3637E960" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_023A85C6CC8B0FF0832DB8A6BA23C12D_terseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_4B6AEA65682558759B9C937E75E1C4FE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Equity </link:label>
<link:label id="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_023A85C6CC8B0FF0832DB8A6BA23C12D_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_4B6AEA65682558759B9C937E75E1C4FE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stockholders' Equity Note Disclosure [Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:label="loc_us-gaap_StockholdersEquityNoteDisclosureTextBlock_4B6AEA65682558759B9C937E75E1C4FE" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_24842DE75A7F95753595B8A6BB6BEECF_terseLabel_en-US" xlink:label="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_9B8F8A9A89B45C8D83BED97FF08909DC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Business and Basis of Presentation </link:label>
<link:label id="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_24842DE75A7F95753595B8A6BB6BEECF_label_en-US" xlink:label="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_9B8F8A9A89B45C8D83BED97FF08909DC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_9B8F8A9A89B45C8D83BED97FF08909DC" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLeaseLiabilityCurrent_8145AB8E9402071D4668B8A6BBFD4D7F_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityCurrent_383409B2CF565FCCB32A527CB919C740" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accounts payable and accrued liabilities </link:label>
<link:label id="lab_us-gaap_OperatingLeaseLiabilityCurrent_8145AB8E9402071D4668B8A6BBFD4D7F_label_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityCurrent_383409B2CF565FCCB32A527CB919C740" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Lease, Liability, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_383409B2CF565FCCB32A527CB919C740" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_6374A1F7C01B15FE431EB8A6BBFD1BF8_verboseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiabilityNoncurrent_B1A45FC471AA530D8C4C4751C80400AB" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Operating leases - liabilities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_B1A45FC471AA530D8C4C4751C80400AB" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLeaseLiability_067CCF8C8D83680B34F8B8A6BBFEF8A3_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiability_AA07E37E4AA1515585CAF743E1072CFE" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total operating lease liabilities per the Condensed Consolidated Balance Sheet </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_AA07E37E4AA1515585CAF743E1072CFE" xlink:type="locator"/>
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<link:label id="lab_it_LesseeOperatingLeaseLeaseNotYetCommencedPaymentsDue_5D85CD2E248DD311B204B8A6BBFEE0FE_terseLabel_en-US" xlink:label="lab_it_LesseeOperatingLeaseLeaseNotYetCommencedPaymentsDue_FAAE8BF874FD5A2983814A97E0BD98E1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Leases not yet commenced </link:label>
<link:label id="lab_it_LesseeOperatingLeaseLeaseNotYetCommencedPaymentsDue_5D85CD2E248DD311B204B8A6BBFEE0FE_label_en-US" xlink:label="lab_it_LesseeOperatingLeaseLeaseNotYetCommencedPaymentsDue_FAAE8BF874FD5A2983814A97E0BD98E1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Lease Not Yet Commenced, Payments Due </link:label>
<link:label id="lab_it_LesseeOperatingLeaseLeaseNotYetCommencedPaymentsDue_5D85CD2E248DD311B204B8A6BBFEE0FE_documentation_en-US" xlink:label="lab_it_LesseeOperatingLeaseLeaseNotYetCommencedPaymentsDue_FAAE8BF874FD5A2983814A97E0BD98E1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Lease Not Yet Commenced, Payments Due </link:label>
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<link:label id="lab_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_CF7A21212813FC00BE4CB8A6BBFE9799_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_49D61C9B8FA254CD90D0EF02BE1379CA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Leases not yet commenced, term </link:label>
<link:label id="lab_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_CF7A21212813FC00BE4CB8A6BBFE9799_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_49D61C9B8FA254CD90D0EF02BE1379CA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1" xlink:label="loc_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_49D61C9B8FA254CD90D0EF02BE1379CA" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ScheduleOfDebtTableTextBlock_59E65A6601138C1D3428B8A6BBD8BA04_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfDebtTableTextBlock_3AEAB776385E5CF58560DB88FDE46BD5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of debt </link:label>
<link:label id="lab_us-gaap_ScheduleOfDebtTableTextBlock_59E65A6601138C1D3428B8A6BBD8BA04_label_en-US" xlink:label="lab_us-gaap_ScheduleOfDebtTableTextBlock_3AEAB776385E5CF58560DB88FDE46BD5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Debt [Table Text Block] </link:label>
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<link:label id="lab_it_UnvestedMember_4EDB4278B243CEE2384592C01FA1C94F_terseLabel_en-US" xlink:label="lab_it_UnvestedMember_4EDB4278B243CEE2384592C01FA1C94F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Unvested </link:label>
<link:label id="lab_it_UnvestedMember_4EDB4278B243CEE2384592C01FA1C94F_label_en-US" xlink:label="lab_it_UnvestedMember_4EDB4278B243CEE2384592C01FA1C94F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Unvested [Member] </link:label>
<link:label id="lab_it_UnvestedMember_4EDB4278B243CEE2384592C01FA1C94F_documentation_en-US" xlink:label="lab_it_UnvestedMember_4EDB4278B243CEE2384592C01FA1C94F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> -- None. No documentation exists for this element. -- </link:label>
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<link:label id="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpiryPeriodFromDateOfGrant_151A779B51018EEFB46D92C01FA35B1D_terseLabel_en-US" xlink:label="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpiryPeriodFromDateOfGrant_151A779B51018EEFB46D92C01FA35B1D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Award expiration period from date of grant </link:label>
<link:label id="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpiryPeriodFromDateOfGrant_151A779B51018EEFB46D92C01FA35B1D_label_en-US" xlink:label="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpiryPeriodFromDateOfGrant_151A779B51018EEFB46D92C01FA35B1D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share Based Compensation Arrangement By Share Based Payment Award Expiry Period From Date Of Grant </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7ED0D55B20A577ACFD4192C01FA34513" xlink:type="locator"/>
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<link:label id="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriod_CF0CF8F54AF8F2EB30D892C01FA486A8_negatedLabel_en-US" xlink:label="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriod_CF0CF8F54AF8F2EB30D892C01FA486A8" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US"> Exercised (in shares) </link:label>
<link:label id="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriod_CF0CF8F54AF8F2EB30D892C01FA486A8_label_en-US" xlink:label="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriod_CF0CF8F54AF8F2EB30D892C01FA486A8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Exercised (in Shares) </link:label>
<link:label id="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriod_CF0CF8F54AF8F2EB30D892C01FA486A8_documentation_en-US" xlink:label="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriod_CF0CF8F54AF8F2EB30D892C01FA486A8" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercises in Period. </link:label>
<link:loc xlink:href="it-20190930.xsd#it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriod" xlink:label="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriod_CF0CF8F54AF8F2EB30D892C01FA486A8" xlink:type="locator"/>
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<link:label id="lab_it_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsVestedandExpectedtoVestExercisableNumber_6E204FBC7FB5DB8BAECB92C01FA4CD53_terseLabel_en-US" xlink:label="lab_it_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsVestedandExpectedtoVestExercisableNumber_6E204FBC7FB5DB8BAECB92C01FA4CD53" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Vested and exercisable at ending balance (in shares) </link:label>
<link:label id="lab_it_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsVestedandExpectedtoVestExercisableNumber_6E204FBC7FB5DB8BAECB92C01FA4CD53_label_en-US" xlink:label="lab_it_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsVestedandExpectedtoVestExercisableNumber_6E204FBC7FB5DB8BAECB92C01FA4CD53" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Vested and Expected to Vest, Exercisable, Number </link:label>
<link:label id="lab_it_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsVestedandExpectedtoVestExercisableNumber_6E204FBC7FB5DB8BAECB92C01FA4CD53_documentation_en-US" xlink:label="lab_it_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsVestedandExpectedtoVestExercisableNumber_6E204FBC7FB5DB8BAECB92C01FA4CD53" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Vested and Expected to Vest, Exercisable, Number </link:label>
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<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsVestedandExpectedtoVestExercisableNumber_6E204FBC7FB5DB8BAECB92C01FA4CD53" xlink:to="lab_it_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsVestedandExpectedtoVestExercisableNumber_6E204FBC7FB5DB8BAECB92C01FA4CD53" xlink:type="arc"/>
<link:label id="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExercisePriceRollForward_70BA7F723EE41D1A97B992C01FA485ED_terseLabel_en-US" xlink:label="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExercisePriceRollForward_70BA7F723EE41D1A97B992C01FA485ED" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Per Share Weighted Average Exercise Price [Roll Forward] </link:label>
<link:label id="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExercisePriceRollForward_70BA7F723EE41D1A97B992C01FA485ED_label_en-US" xlink:label="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExercisePriceRollForward_70BA7F723EE41D1A97B992C01FA485ED" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Exercise Price [Roll Forward] </link:label>
<link:label id="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExercisePriceRollForward_70BA7F723EE41D1A97B992C01FA485ED_documentation_en-US" xlink:label="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExercisePriceRollForward_70BA7F723EE41D1A97B992C01FA485ED" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Exercise Price [Roll Forward] </link:label>
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<link:label id="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_402C543813E650C2F94692C01FA40764_periodStartLabel_en-US" xlink:label="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_402C543813E650C2F94692C01FA40764" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US"> Outstanding at beginning balance (in dollars per share) </link:label>
<link:label id="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_402C543813E650C2F94692C01FA40764_label_en-US" xlink:label="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_402C543813E650C2F94692C01FA40764" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Per Share Weighted- Average Exercise Price </link:label>
<link:label id="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_402C543813E650C2F94692C01FA40764_documentation_en-US" xlink:label="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice_402C543813E650C2F94692C01FA40764" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Exercise Price. </link:label>
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<link:label id="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice_FECB55E5E290C9334BEA92C01FA525CB_terseLabel_en-US" xlink:label="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice_FECB55E5E290C9334BEA92C01FA525CB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Granted (in dollars per share) </link:label>
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<link:label id="lab_it_SharebasedCompensationArrangementsbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsForfeituresinPeriodWeightedAverageExercisePrice_275E933A9266DE909BF992C01FA56C14_terseLabel_en-US" xlink:label="lab_it_SharebasedCompensationArrangementsbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsForfeituresinPeriodWeightedAverageExercisePrice_275E933A9266DE909BF992C01FA56C14" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Forfeited (in dollars per share) </link:label>
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<link:label id="lab_it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedandExpectedtoVestExercisableAggregateIntrinsicValue._4C95D6C707F69420018C92C01FA744DC_terseLabel_en-US" xlink:label="lab_it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedandExpectedtoVestExercisableAggregateIntrinsicValue._4C95D6C707F69420018C92C01FA744DC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Aggregate intrinsic value of shares vested and exercisable </link:label>
<link:label id="lab_it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedandExpectedtoVestExercisableAggregateIntrinsicValue._4C95D6C707F69420018C92C01FA744DC_label_en-US" xlink:label="lab_it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedandExpectedtoVestExercisableAggregateIntrinsicValue._4C95D6C707F69420018C92C01FA744DC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share based Compensation Arrangement by Share based Payment Award, Equity Instruments Other Than Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value. </link:label>
<link:label id="lab_it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedandExpectedtoVestExercisableAggregateIntrinsicValue._4C95D6C707F69420018C92C01FA744DC_documentation_en-US" xlink:label="lab_it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedandExpectedtoVestExercisableAggregateIntrinsicValue._4C95D6C707F69420018C92C01FA744DC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Share based Compensation Arrangement by Share based Payment Award, Equity Instruments Other Than Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value. </link:label>
<link:loc xlink:href="it-20190930.xsd#it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedandExpectedtoVestExercisableAggregateIntrinsicValue." xlink:label="loc_it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedandExpectedtoVestExercisableAggregateIntrinsicValue._4C95D6C707F69420018C92C01FA744DC" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedandExpectedtoVestExercisableAggregateIntrinsicValue._4C95D6C707F69420018C92C01FA744DC" xlink:to="lab_it_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedandExpectedtoVestExercisableAggregateIntrinsicValue._4C95D6C707F69420018C92C01FA744DC" xlink:type="arc"/>
<link:label id="lab_us-gaap_ContractWithCustomerAssetNetAbstract_4E268711984D60AE543720DE864DC4EB_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerAssetNetAbstract_4E268711984D60AE543720DE864DC4EB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Assets: </link:label>
<link:label id="lab_us-gaap_ContractWithCustomerAssetNetAbstract_4E268711984D60AE543720DE864DC4EB_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerAssetNetAbstract_4E268711984D60AE543720DE864DC4EB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Contract with Customer, Asset, after Allowance for Credit Loss [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerAssetNetAbstract" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetAbstract_4E268711984D60AE543720DE864DC4EB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerAssetNetAbstract_4E268711984D60AE543720DE864DC4EB" xlink:to="lab_us-gaap_ContractWithCustomerAssetNetAbstract_4E268711984D60AE543720DE864DC4EB" xlink:type="arc"/>
<link:label id="lab_us-gaap_AccountsReceivableGrossCurrent_DF5D132B4D213F60F85120EC89F5F885_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsReceivableGrossCurrent_DF5D132B4D213F60F85120EC89F5F885" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fees receivable, gross </link:label>
<link:label id="lab_us-gaap_AccountsReceivableGrossCurrent_DF5D132B4D213F60F85120EC89F5F885_label_en-US" xlink:label="lab_us-gaap_AccountsReceivableGrossCurrent_DF5D132B4D213F60F85120EC89F5F885" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Accounts Receivable, before Allowance for Credit Loss, Current </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsReceivableGrossCurrent" xlink:label="loc_us-gaap_AccountsReceivableGrossCurrent_DF5D132B4D213F60F85120EC89F5F885" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountsReceivableGrossCurrent_DF5D132B4D213F60F85120EC89F5F885" xlink:to="lab_us-gaap_AccountsReceivableGrossCurrent_DF5D132B4D213F60F85120EC89F5F885" xlink:type="arc"/>
<link:label id="lab_us-gaap_ContractWithCustomerAssetGross_D03AECEA20DABB9296C320DE864D21FF_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerAssetGross_D03AECEA20DABB9296C320DE864D21FF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Contract assets recorded in Prepaid expenses and other current assets </link:label>
<link:label id="lab_us-gaap_ContractWithCustomerAssetGross_D03AECEA20DABB9296C320DE864D21FF_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerAssetGross_D03AECEA20DABB9296C320DE864D21FF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Contract with Customer, Asset, before Allowance for Credit Loss </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerAssetGross" xlink:label="loc_us-gaap_ContractWithCustomerAssetGross_D03AECEA20DABB9296C320DE864D21FF" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerAssetGross_D03AECEA20DABB9296C320DE864D21FF" xlink:to="lab_us-gaap_ContractWithCustomerAssetGross_D03AECEA20DABB9296C320DE864D21FF" xlink:type="arc"/>
<link:label id="lab_us-gaap_ContractWithCustomerLiabilityAbstract_90B668F0E1CC5B429CDC20DE864E3DF5_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiabilityAbstract_90B668F0E1CC5B429CDC20DE864E3DF5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Contract liabilities: </link:label>
<link:label id="lab_us-gaap_ContractWithCustomerLiabilityAbstract_90B668F0E1CC5B429CDC20DE864E3DF5_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiabilityAbstract_90B668F0E1CC5B429CDC20DE864E3DF5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Contract with Customer, Liability [Abstract] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiabilityAbstract" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityAbstract_90B668F0E1CC5B429CDC20DE864E3DF5" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerLiabilityAbstract_90B668F0E1CC5B429CDC20DE864E3DF5" xlink:to="lab_us-gaap_ContractWithCustomerLiabilityAbstract_90B668F0E1CC5B429CDC20DE864E3DF5" xlink:type="arc"/>
<link:label id="lab_us-gaap_ContractWithCustomerLiabilityCurrent_785A073575B9ABBEF6C820DE864E4903_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiabilityCurrent_785A073575B9ABBEF6C820DE864E4903" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Deferred revenues (current liability) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_785A073575B9ABBEF6C820DE864E4903" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerLiabilityCurrent_785A073575B9ABBEF6C820DE864E4903" xlink:to="lab_us-gaap_ContractWithCustomerLiabilityCurrent_785A073575B9ABBEF6C820DE864E4903" xlink:type="arc"/>
<link:label id="lab_us-gaap_ContractWithCustomerLiabilityNoncurrent_E8AC14442593ADDB4D0320DE864E15DC_terseLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiabilityNoncurrent_E8AC14442593ADDB4D0320DE864E15DC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Non-current deferred revenues recorded in Other liabilities </link:label>
<link:label id="lab_us-gaap_ContractWithCustomerLiabilityNoncurrent_E8AC14442593ADDB4D0320DE864E15DC_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiabilityNoncurrent_E8AC14442593ADDB4D0320DE864E15DC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Contract with Customer, Liability, Noncurrent </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_E8AC14442593ADDB4D0320DE864E15DC" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_E8AC14442593ADDB4D0320DE864E15DC" xlink:to="lab_us-gaap_ContractWithCustomerLiabilityNoncurrent_E8AC14442593ADDB4D0320DE864E15DC" xlink:type="arc"/>
<link:label id="lab_us-gaap_ContractWithCustomerLiability_1A59303277E4DD3AE5B920DE864E51BC_totalLabel_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiability_1A59303277E4DD3AE5B920DE864E51BC" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total contract liabilities </link:label>
<link:label id="lab_us-gaap_ContractWithCustomerLiability_1A59303277E4DD3AE5B920DE864E51BC_label_en-US" xlink:label="lab_us-gaap_ContractWithCustomerLiability_1A59303277E4DD3AE5B920DE864E51BC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Contract with Customer, Liability </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiability" xlink:label="loc_us-gaap_ContractWithCustomerLiability_1A59303277E4DD3AE5B920DE864E51BC" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ContractWithCustomerLiability_1A59303277E4DD3AE5B920DE864E51BC" xlink:to="lab_us-gaap_ContractWithCustomerLiability_1A59303277E4DD3AE5B920DE864E51BC" xlink:type="arc"/>
<link:label id="lab_it_BaseFeePercentage_47BCDB994B0764DD3EC7D0AE1B5FF20F_terseLabel_en-US" xlink:label="lab_it_BaseFeePercentage_47BCDB994B0764DD3EC7D0AE1B5FF20F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Base fee percentage (up to) </link:label>
<link:label id="lab_it_BaseFeePercentage_47BCDB994B0764DD3EC7D0AE1B5FF20F_label_en-US" xlink:label="lab_it_BaseFeePercentage_47BCDB994B0764DD3EC7D0AE1B5FF20F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Base Fee Percentage </link:label>
<link:label id="lab_it_BaseFeePercentage_47BCDB994B0764DD3EC7D0AE1B5FF20F_documentation_en-US" xlink:label="lab_it_BaseFeePercentage_47BCDB994B0764DD3EC7D0AE1B5FF20F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Base fee percentage. </link:label>
<link:loc xlink:href="it-20190930.xsd#it_BaseFeePercentage" xlink:label="loc_it_BaseFeePercentage_47BCDB994B0764DD3EC7D0AE1B5FF20F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_BaseFeePercentage_47BCDB994B0764DD3EC7D0AE1B5FF20F" xlink:to="lab_it_BaseFeePercentage_47BCDB994B0764DD3EC7D0AE1B5FF20F" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4072EEFA84BEEED98D30D0AE1B5FBF51_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4072EEFA84BEEED98D30D0AE1B5FBF51" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Common Stock Equivalents (CSEs) [Roll Forward] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4072EEFA84BEEED98D30D0AE1B5FBF51" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4072EEFA84BEEED98D30D0AE1B5FBF51" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4072EEFA84BEEED98D30D0AE1B5FBF51" xlink:type="arc"/>
<link:label id="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriod_A5996F9D4A3B645D51A1D0AE1B608F23_negatedTerseLabel_en-US" xlink:label="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriod_A5996F9D4A3B645D51A1D0AE1B608F23" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Converted to shares of Common Stock upon grant (in shares) </link:label>
<link:label id="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriod_A5996F9D4A3B645D51A1D0AE1B608F23_label_en-US" xlink:label="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriod_A5996F9D4A3B645D51A1D0AE1B608F23" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Converted to common shares </link:label>
<link:label id="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriod_A5996F9D4A3B645D51A1D0AE1B608F23_documentation_en-US" xlink:label="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriod_A5996F9D4A3B645D51A1D0AE1B608F23" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Unvested, Conversions in Period. </link:label>
<link:loc xlink:href="it-20190930.xsd#it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriod" xlink:label="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriod_A5996F9D4A3B645D51A1D0AE1B608F23" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriod_A5996F9D4A3B645D51A1D0AE1B608F23" xlink:to="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriod_A5996F9D4A3B645D51A1D0AE1B608F23" xlink:type="arc"/>
<link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_2FEACB43D529CC655FF0D0AE1B61C3C2_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_2FEACB43D529CC655FF0D0AE1B61C3C2" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Granted (in dollars per share) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_2FEACB43D529CC655FF0D0AE1B61C3C2" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_2FEACB43D529CC655FF0D0AE1B61C3C2" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_2FEACB43D529CC655FF0D0AE1B61C3C2" xlink:type="arc"/>
<link:label id="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriodWeightedAverageGrantDateFairValue_551AC81FAB65125827F0D0AE1B61A27E_terseLabel_en-US" xlink:label="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriodWeightedAverageGrantDateFairValue_551AC81FAB65125827F0D0AE1B61A27E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Converted to shares of Common Stock upon grant (in dollars per share) </link:label>
<link:label id="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriodWeightedAverageGrantDateFairValue_551AC81FAB65125827F0D0AE1B61A27E_label_en-US" xlink:label="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriodWeightedAverageGrantDateFairValue_551AC81FAB65125827F0D0AE1B61A27E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested And Unvested Conversions In Period Weighted Average Grant Date Fair Value </link:label>
<link:label id="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriodWeightedAverageGrantDateFairValue_551AC81FAB65125827F0D0AE1B61A27E_documentation_en-US" xlink:label="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriodWeightedAverageGrantDateFairValue_551AC81FAB65125827F0D0AE1B61A27E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Unvested, Conversions in Period, Weighted Average Grant Date Fair Value. </link:label>
<link:loc xlink:href="it-20190930.xsd#it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriodWeightedAverageGrantDateFairValue_551AC81FAB65125827F0D0AE1B61A27E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriodWeightedAverageGrantDateFairValue_551AC81FAB65125827F0D0AE1B61A27E" xlink:to="lab_it_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndUnvestedConversionsInPeriodWeightedAverageGrantDateFairValue_551AC81FAB65125827F0D0AE1B61A27E" xlink:type="arc"/>
<link:label id="lab_us-gaap_ScheduleOfGoodwillTable_1186F77CA56B9F9C264AB8A6BBEE8A20_label_en-US" xlink:label="lab_us-gaap_ScheduleOfGoodwillTable_C9412CC63A0C567FAA4DDF044E8A320F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Goodwill [Table] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfGoodwillTable" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_C9412CC63A0C567FAA4DDF044E8A320F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_GoodwillLineItems_A6F2B2711ED7BF04964BB8A6BBF0DFFD_label_en-US" xlink:label="lab_us-gaap_GoodwillLineItems_DAED8A209DD55891BC824A93C34BA298" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Goodwill [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillLineItems" xlink:label="loc_us-gaap_GoodwillLineItems_DAED8A209DD55891BC824A93C34BA298" xlink:type="locator"/>
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<link:label id="lab_us-gaap_GoodwillImpairmentLoss_11879464220221E12212B8A6BBF0BE3D_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillImpairmentLoss_8AFE225B38965B48A3F9069359295233" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Goodwill impairment </link:label>
<link:label id="lab_us-gaap_GoodwillImpairmentLoss_11879464220221E12212B8A6BBF0BE3D_label_en-US" xlink:label="lab_us-gaap_GoodwillImpairmentLoss_8AFE225B38965B48A3F9069359295233" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Goodwill, Impairment Loss </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillImpairmentLoss" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_8AFE225B38965B48A3F9069359295233" xlink:type="locator"/>
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<link:label id="lab_us-gaap_GoodwillRollForward_85B172DD568CA4C243BAB8A6BBF07A75_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillRollForward_0AF93F72C203580EBE12609487C0516F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Goodwill [Roll Forward] </link:label>
<link:label id="lab_us-gaap_GoodwillRollForward_85B172DD568CA4C243BAB8A6BBF07A75_label_en-US" xlink:label="lab_us-gaap_GoodwillRollForward_0AF93F72C203580EBE12609487C0516F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Goodwill [Roll Forward] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillRollForward" xlink:label="loc_us-gaap_GoodwillRollForward_0AF93F72C203580EBE12609487C0516F" xlink:type="locator"/>
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<link:label id="lab_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_BD39F7A038A680811393B8A6BBF16570_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_E16345D3360E5602AC20F02993C21A9B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Foreign currency translation impact </link:label>
<link:label id="lab_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_BD39F7A038A680811393B8A6BBF16570_label_en-US" xlink:label="lab_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_E16345D3360E5602AC20F02993C21A9B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Goodwill, Foreign Currency Translation Gain (Loss) </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_0F015DBCD04159BB8D39BB9068A3411C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_E464A7881F51BDCF89BDB8A6BBF2AD65_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_342DC818A7835DF5AC6232CBDD08FD0B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Goodwill, accumulated impairment losses </link:label>
<link:label id="lab_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_E464A7881F51BDCF89BDB8A6BBF2AD65_label_en-US" xlink:label="lab_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_342DC818A7835DF5AC6232CBDD08FD0B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Goodwill, Impaired, Accumulated Impairment Loss </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillImpairedAccumulatedImpairmentLoss" xlink:label="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_342DC818A7835DF5AC6232CBDD08FD0B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_5BF379A0D371B8593DC305EFAD98EF3A_label_en-US" xlink:label="lab_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_D18C1930272F5952986C70F00B470A21" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Finite-Lived Intangible Assets [Table] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_D18C1930272F5952986C70F00B470A21" xlink:type="locator"/>
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<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_364FE13CA474B608DBB305EFAD9899EA_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_E73A08776804521DBC172DA39082DDAA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Finite-Lived Intangible Assets by Major Class [Axis] </link:label>
<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_364FE13CA474B608DBB305EFAD9899EA_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_E73A08776804521DBC172DA39082DDAA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finite-Lived Intangible Assets by Major Class [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_E73A08776804521DBC172DA39082DDAA" xlink:type="locator"/>
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<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_56166F6B931F09F512B105EFAD994906_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_E93E78093BE85D0B86F6E91C865D8F99" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Finite-Lived Intangible Assets, Major Class Name [Domain] </link:label>
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<link:label id="lab_us-gaap_CustomerRelationshipsMember_E73A950DF7A394B74BB105EFAD996E31_terseLabel_en-US" xlink:label="lab_us-gaap_CustomerRelationshipsMember_2F9386F7A1635DBFB5F7EB4D4AD3EF6D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Customer Relationships </link:label>
<link:label id="lab_us-gaap_CustomerRelationshipsMember_E73A950DF7A394B74BB105EFAD996E31_label_en-US" xlink:label="lab_us-gaap_CustomerRelationshipsMember_2F9386F7A1635DBFB5F7EB4D4AD3EF6D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Customer Relationships [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="loc_us-gaap_CustomerRelationshipsMember_2F9386F7A1635DBFB5F7EB4D4AD3EF6D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ComputerSoftwareIntangibleAssetMember_9A738E6E44187D5CE3FC05EFADA4E48D_terseLabel_en-US" xlink:label="lab_us-gaap_ComputerSoftwareIntangibleAssetMember_F46A46C2ED365665963EA37A7650BA6F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Software </link:label>
<link:label id="lab_us-gaap_ComputerSoftwareIntangibleAssetMember_9A738E6E44187D5CE3FC05EFADA4E48D_label_en-US" xlink:label="lab_us-gaap_ComputerSoftwareIntangibleAssetMember_F46A46C2ED365665963EA37A7650BA6F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Computer Software, Intangible Asset [Member] </link:label>
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<link:label id="lab_us-gaap_MediaContentMember_49B1C62153529BCB7E6605EFADA4E546_terseLabel_en-US" xlink:label="lab_us-gaap_MediaContentMember_A14D5CCB4D185E978550C0580F581363" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Content </link:label>
<link:label id="lab_us-gaap_MediaContentMember_49B1C62153529BCB7E6605EFADA4E546_label_en-US" xlink:label="lab_us-gaap_MediaContentMember_A14D5CCB4D185E978550C0580F581363" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Media Content [Member] </link:label>
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<link:label id="lab_us-gaap_OtherIntangibleAssetsMember_6B8C393CDFE1DC53EB0705EFADA4BB22_terseLabel_en-US" xlink:label="lab_us-gaap_OtherIntangibleAssetsMember_2778BF3AE19659B482C96C0E9CD12CCB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other </link:label>
<link:label id="lab_us-gaap_OtherIntangibleAssetsMember_6B8C393CDFE1DC53EB0705EFADA4BB22_label_en-US" xlink:label="lab_us-gaap_OtherIntangibleAssetsMember_2778BF3AE19659B482C96C0E9CD12CCB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Intangible Assets [Member] </link:label>
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<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsLineItems_75976190F17F42117B6C05EFADA569E5_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsLineItems_43B278983BD8586795A591835CCCBC7C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Finite-Lived Intangible Assets [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_43B278983BD8586795A591835CCCBC7C" xlink:type="locator"/>
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<link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsRollForward_8A2B2D7A8DFBCAC515E905EFADA569A5_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsRollForward_CD993F2A9B89584790C7A9E1DD3415E6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Finite-lived Intangible Assets [Roll Forward] </link:label>
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<link:label id="lab_us-gaap_CreditFacilityAxis_BFAB867B802C9954DB82D59FCB1E52DF_terseLabel_en-US" xlink:label="lab_us-gaap_CreditFacilityAxis_BFAB867B802C9954DB82D59FCB1E52DF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Credit Facility [Axis] </link:label>
<link:label id="lab_us-gaap_CreditFacilityAxis_BFAB867B802C9954DB82D59FCB1E52DF_label_en-US" xlink:label="lab_us-gaap_CreditFacilityAxis_BFAB867B802C9954DB82D59FCB1E52DF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Credit Facility [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_BFAB867B802C9954DB82D59FCB1E52DF" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CreditFacilityAxis_BFAB867B802C9954DB82D59FCB1E52DF" xlink:to="lab_us-gaap_CreditFacilityAxis_BFAB867B802C9954DB82D59FCB1E52DF" xlink:type="arc"/>
<link:label id="lab_us-gaap_CreditFacilityDomain_022C6ECE5B148F8F5CE4D59FCB1E2898_terseLabel_en-US" xlink:label="lab_us-gaap_CreditFacilityDomain_022C6ECE5B148F8F5CE4D59FCB1E2898" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Credit Facility [Domain] </link:label>
<link:label id="lab_us-gaap_CreditFacilityDomain_022C6ECE5B148F8F5CE4D59FCB1E2898_label_en-US" xlink:label="lab_us-gaap_CreditFacilityDomain_022C6ECE5B148F8F5CE4D59FCB1E2898" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Credit Facility [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_022C6ECE5B148F8F5CE4D59FCB1E2898" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CreditFacilityDomain_022C6ECE5B148F8F5CE4D59FCB1E2898" xlink:to="lab_us-gaap_CreditFacilityDomain_022C6ECE5B148F8F5CE4D59FCB1E2898" xlink:type="arc"/>
<link:label id="lab_us-gaap_RevolvingCreditFacilityMember_A14B867FB7F80671CCF0D59FCB1E2E00_terseLabel_en-US" xlink:label="lab_us-gaap_RevolvingCreditFacilityMember_A14B867FB7F80671CCF0D59FCB1E2E00" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Revolving credit facility </link:label>
<link:label id="lab_us-gaap_RevolvingCreditFacilityMember_A14B867FB7F80671CCF0D59FCB1E2E00_label_en-US" xlink:label="lab_us-gaap_RevolvingCreditFacilityMember_A14B867FB7F80671CCF0D59FCB1E2E00" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Revolving Credit Facility [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_A14B867FB7F80671CCF0D59FCB1E2E00" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevolvingCreditFacilityMember_A14B867FB7F80671CCF0D59FCB1E2E00" xlink:to="lab_us-gaap_RevolvingCreditFacilityMember_A14B867FB7F80671CCF0D59FCB1E2E00" xlink:type="arc"/>
<link:label id="lab_it_BankTermLoanMember_A89F38C61B6C0DEA8163D59FCB1F0655_terseLabel_en-US" xlink:label="lab_it_BankTermLoanMember_A89F38C61B6C0DEA8163D59FCB1F0655" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Bank Term Loan - A Facility </link:label>
<link:label id="lab_it_BankTermLoanMember_A89F38C61B6C0DEA8163D59FCB1F0655_label_en-US" xlink:label="lab_it_BankTermLoanMember_A89F38C61B6C0DEA8163D59FCB1F0655" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Bank Term Loan [Member] </link:label>
<link:label id="lab_it_BankTermLoanMember_A89F38C61B6C0DEA8163D59FCB1F0655_documentation_en-US" xlink:label="lab_it_BankTermLoanMember_A89F38C61B6C0DEA8163D59FCB1F0655" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> -- None. No documentation exists for this element. -- </link:label>
<link:loc xlink:href="it-20190930.xsd#it_BankTermLoanMember" xlink:label="loc_it_BankTermLoanMember_A89F38C61B6C0DEA8163D59FCB1F0655" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_BankTermLoanMember_A89F38C61B6C0DEA8163D59FCB1F0655" xlink:to="lab_it_BankTermLoanMember_A89F38C61B6C0DEA8163D59FCB1F0655" xlink:type="arc"/>
<link:label id="lab_it_ConnecticutEconomicDevelopmentProgramMember_B38D6B80B2460790C056D59FCB1F0D46_terseLabel_en-US" xlink:label="lab_it_ConnecticutEconomicDevelopmentProgramMember_B38D6B80B2460790C056D59FCB1F0D46" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Connecticut Economic Development Program </link:label>
<link:label id="lab_it_ConnecticutEconomicDevelopmentProgramMember_B38D6B80B2460790C056D59FCB1F0D46_label_en-US" xlink:label="lab_it_ConnecticutEconomicDevelopmentProgramMember_B38D6B80B2460790C056D59FCB1F0D46" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Connecticut Economic Development Program [Member] </link:label>
<link:label id="lab_it_ConnecticutEconomicDevelopmentProgramMember_B38D6B80B2460790C056D59FCB1F0D46_documentation_en-US" xlink:label="lab_it_ConnecticutEconomicDevelopmentProgramMember_B38D6B80B2460790C056D59FCB1F0D46" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> -- None. No documentation exists for this element. -- </link:label>
<link:loc xlink:href="it-20190930.xsd#it_ConnecticutEconomicDevelopmentProgramMember" xlink:label="loc_it_ConnecticutEconomicDevelopmentProgramMember_B38D6B80B2460790C056D59FCB1F0D46" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_ConnecticutEconomicDevelopmentProgramMember_B38D6B80B2460790C056D59FCB1F0D46" xlink:to="lab_it_ConnecticutEconomicDevelopmentProgramMember_B38D6B80B2460790C056D59FCB1F0D46" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtInstrumentLineItems_A9A7797C9A79460D5B2DD59FCB1F186D_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_A9A7797C9A79460D5B2DD59FCB1F186D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt Instrument [Line Items] </link:label>
<link:label id="lab_us-gaap_DebtInstrumentLineItems_A9A7797C9A79460D5B2DD59FCB1F186D_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_A9A7797C9A79460D5B2DD59FCB1F186D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_A9A7797C9A79460D5B2DD59FCB1F186D" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentLineItems_A9A7797C9A79460D5B2DD59FCB1F186D" xlink:to="lab_us-gaap_DebtInstrumentLineItems_A9A7797C9A79460D5B2DD59FCB1F186D" xlink:type="arc"/>
<link:label id="lab_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_1EAA23A828306E991324D59FCB207C2E_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_1EAA23A828306E991324D59FCB207C2E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Contractual annualized interest rate </link:label>
<link:label id="lab_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_1EAA23A828306E991324D59FCB207C2E_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_1EAA23A828306E991324D59FCB207C2E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Interest Rate at Period End </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd" xlink:label="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_1EAA23A828306E991324D59FCB207C2E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_1EAA23A828306E991324D59FCB207C2E" xlink:to="lab_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_1EAA23A828306E991324D59FCB207C2E" xlink:type="arc"/>
<link:label id="lab_it_FloatingEurodollarBaseRate_82387E30D3C5BEF18893D59FCB20EE04_terseLabel_en-US" xlink:label="lab_it_FloatingEurodollarBaseRate_82387E30D3C5BEF18893D59FCB20EE04" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Floating eurodollar base rate </link:label>
<link:label id="lab_it_FloatingEurodollarBaseRate_82387E30D3C5BEF18893D59FCB20EE04_label_en-US" xlink:label="lab_it_FloatingEurodollarBaseRate_82387E30D3C5BEF18893D59FCB20EE04" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Floating Eurodollar Base Rate </link:label>
<link:label id="lab_it_FloatingEurodollarBaseRate_82387E30D3C5BEF18893D59FCB20EE04_documentation_en-US" xlink:label="lab_it_FloatingEurodollarBaseRate_82387E30D3C5BEF18893D59FCB20EE04" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Floating Euro Dollar Base Rate </link:label>
<link:loc xlink:href="it-20190930.xsd#it_FloatingEurodollarBaseRate" xlink:label="loc_it_FloatingEurodollarBaseRate_82387E30D3C5BEF18893D59FCB20EE04" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_FloatingEurodollarBaseRate_82387E30D3C5BEF18893D59FCB20EE04" xlink:to="lab_it_FloatingEurodollarBaseRate_82387E30D3C5BEF18893D59FCB20EE04" xlink:type="arc"/>
<link:label id="lab_it_DebtInstrumentAdditionalInterestaboveBaseRate_E01206B661E2D0DE3567D59FCB205F9B_terseLabel_en-US" xlink:label="lab_it_DebtInstrumentAdditionalInterestaboveBaseRate_E01206B661E2D0DE3567D59FCB205F9B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Additional interest above base rate </link:label>
<link:label id="lab_it_DebtInstrumentAdditionalInterestaboveBaseRate_E01206B661E2D0DE3567D59FCB205F9B_label_en-US" xlink:label="lab_it_DebtInstrumentAdditionalInterestaboveBaseRate_E01206B661E2D0DE3567D59FCB205F9B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Additional Interest above Base Rate </link:label>
<link:label id="lab_it_DebtInstrumentAdditionalInterestaboveBaseRate_E01206B661E2D0DE3567D59FCB205F9B_documentation_en-US" xlink:label="lab_it_DebtInstrumentAdditionalInterestaboveBaseRate_E01206B661E2D0DE3567D59FCB205F9B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Additional Interest above Base Rate </link:label>
<link:loc xlink:href="it-20190930.xsd#it_DebtInstrumentAdditionalInterestaboveBaseRate" xlink:label="loc_it_DebtInstrumentAdditionalInterestaboveBaseRate_E01206B661E2D0DE3567D59FCB205F9B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_DebtInstrumentAdditionalInterestaboveBaseRate_E01206B661E2D0DE3567D59FCB205F9B" xlink:to="lab_it_DebtInstrumentAdditionalInterestaboveBaseRate_E01206B661E2D0DE3567D59FCB205F9B" xlink:type="arc"/>
<link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_6E0FA211760E8D45CC39D59FCB207D8C_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_6E0FA211760E8D45CC39D59FCB207D8C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Remaining borrowing capacity </link:label>
<link:label id="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_6E0FA211760E8D45CC39D59FCB207D8C_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_6E0FA211760E8D45CC39D59FCB207D8C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Remaining Borrowing Capacity </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_6E0FA211760E8D45CC39D59FCB207D8C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_6E0FA211760E8D45CC39D59FCB207D8C" xlink:to="lab_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_6E0FA211760E8D45CC39D59FCB207D8C" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_D9E483D09986504F4AA4D59FCB20300B_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_D9E483D09986504F4AA4D59FCB20300B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt instrument, fixed interest rate </link:label>
<link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_D9E483D09986504F4AA4D59FCB20300B_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_D9E483D09986504F4AA4D59FCB20300B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Interest Rate, Stated Percentage </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_D9E483D09986504F4AA4D59FCB20300B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_D9E483D09986504F4AA4D59FCB20300B" xlink:to="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_D9E483D09986504F4AA4D59FCB20300B" xlink:type="arc"/>
<link:label id="lab_it_NumberOfDebtInstruments_6BC1D74FC600913821D1D59FCB21EF37_terseLabel_en-US" xlink:label="lab_it_NumberOfDebtInstruments_6BC1D74FC600913821D1D59FCB21EF37" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of loans </link:label>
<link:label id="lab_it_NumberOfDebtInstruments_6BC1D74FC600913821D1D59FCB21EF37_label_en-US" xlink:label="lab_it_NumberOfDebtInstruments_6BC1D74FC600913821D1D59FCB21EF37" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Number Of Debt Instruments </link:label>
<link:label id="lab_it_NumberOfDebtInstruments_6BC1D74FC600913821D1D59FCB21EF37_documentation_en-US" xlink:label="lab_it_NumberOfDebtInstruments_6BC1D74FC600913821D1D59FCB21EF37" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Number Of Debt Instruments </link:label>
<link:loc xlink:href="it-20190930.xsd#it_NumberOfDebtInstruments" xlink:label="loc_it_NumberOfDebtInstruments_6BC1D74FC600913821D1D59FCB21EF37" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_NumberOfDebtInstruments_6BC1D74FC600913821D1D59FCB21EF37" xlink:to="lab_it_NumberOfDebtInstruments_6BC1D74FC600913821D1D59FCB21EF37" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtInstrumentTerm_ADB8B92C982523E51503D59FCB21D5AB_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentTerm_ADB8B92C982523E51503D59FCB21D5AB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt term </link:label>
<link:label id="lab_us-gaap_DebtInstrumentTerm_ADB8B92C982523E51503D59FCB21D5AB_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentTerm_ADB8B92C982523E51503D59FCB21D5AB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Term </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentTerm" xlink:label="loc_us-gaap_DebtInstrumentTerm_ADB8B92C982523E51503D59FCB21D5AB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentTerm_ADB8B92C982523E51503D59FCB21D5AB" xlink:to="lab_us-gaap_DebtInstrumentTerm_ADB8B92C982523E51503D59FCB21D5AB" xlink:type="arc"/>
<link:label id="lab_it_DebtInstrumentPaymentTermsPeriodPrincipalPaymentsAreDeferred_DC54D8022FC93994F71DD59FCB21E60B_terseLabel_en-US" xlink:label="lab_it_DebtInstrumentPaymentTermsPeriodPrincipalPaymentsAreDeferred_DC54D8022FC93994F71DD59FCB21E60B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Period payments are deferred </link:label>
<link:label id="lab_it_DebtInstrumentPaymentTermsPeriodPrincipalPaymentsAreDeferred_DC54D8022FC93994F71DD59FCB21E60B_label_en-US" xlink:label="lab_it_DebtInstrumentPaymentTermsPeriodPrincipalPaymentsAreDeferred_DC54D8022FC93994F71DD59FCB21E60B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Payment Terms, Period Principal Payments are Deferred </link:label>
<link:label id="lab_it_DebtInstrumentPaymentTermsPeriodPrincipalPaymentsAreDeferred_DC54D8022FC93994F71DD59FCB21E60B_documentation_en-US" xlink:label="lab_it_DebtInstrumentPaymentTermsPeriodPrincipalPaymentsAreDeferred_DC54D8022FC93994F71DD59FCB21E60B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Payment Terms, Period Principal Payments are Deferred </link:label>
<link:loc xlink:href="it-20190930.xsd#it_DebtInstrumentPaymentTermsPeriodPrincipalPaymentsAreDeferred" xlink:label="loc_it_DebtInstrumentPaymentTermsPeriodPrincipalPaymentsAreDeferred_DC54D8022FC93994F71DD59FCB21E60B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_DebtInstrumentPaymentTermsPeriodPrincipalPaymentsAreDeferred_DC54D8022FC93994F71DD59FCB21E60B" xlink:to="lab_it_DebtInstrumentPaymentTermsPeriodPrincipalPaymentsAreDeferred_DC54D8022FC93994F71DD59FCB21E60B" xlink:type="arc"/>
<link:label id="lab_it_DebtInstrumentPossibleForgiveness_03753485860E57E24583D59FCB218AAB_terseLabel_en-US" xlink:label="lab_it_DebtInstrumentPossibleForgiveness_03753485860E57E24583D59FCB218AAB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Possible forgiveness of debt </link:label>
<link:label id="lab_it_DebtInstrumentPossibleForgiveness_03753485860E57E24583D59FCB218AAB_label_en-US" xlink:label="lab_it_DebtInstrumentPossibleForgiveness_03753485860E57E24583D59FCB218AAB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Possible Forgiveness </link:label>
<link:label id="lab_it_DebtInstrumentPossibleForgiveness_03753485860E57E24583D59FCB218AAB_documentation_en-US" xlink:label="lab_it_DebtInstrumentPossibleForgiveness_03753485860E57E24583D59FCB218AAB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Possible Forgiveness </link:label>
<link:loc xlink:href="it-20190930.xsd#it_DebtInstrumentPossibleForgiveness" xlink:label="loc_it_DebtInstrumentPossibleForgiveness_03753485860E57E24583D59FCB218AAB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_DebtInstrumentPossibleForgiveness_03753485860E57E24583D59FCB218AAB" xlink:to="lab_it_DebtInstrumentPossibleForgiveness_03753485860E57E24583D59FCB218AAB" xlink:type="arc"/>
<link:label id="lab_it_DebtInstrumentPossibleForgivenessPeriod_E080367FFC84E03DEBDDD59FCB21830E_terseLabel_en-US" xlink:label="lab_it_DebtInstrumentPossibleForgivenessPeriod_E080367FFC84E03DEBDDD59FCB21830E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Period of possible forgiveness </link:label>
<link:label id="lab_it_DebtInstrumentPossibleForgivenessPeriod_E080367FFC84E03DEBDDD59FCB21830E_label_en-US" xlink:label="lab_it_DebtInstrumentPossibleForgivenessPeriod_E080367FFC84E03DEBDDD59FCB21830E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Possible Forgiveness, Period </link:label>
<link:label id="lab_it_DebtInstrumentPossibleForgivenessPeriod_E080367FFC84E03DEBDDD59FCB21830E_documentation_en-US" xlink:label="lab_it_DebtInstrumentPossibleForgivenessPeriod_E080367FFC84E03DEBDDD59FCB21830E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Possible Forgiveness, Period </link:label>
<link:loc xlink:href="it-20190930.xsd#it_DebtInstrumentPossibleForgivenessPeriod" xlink:label="loc_it_DebtInstrumentPossibleForgivenessPeriod_E080367FFC84E03DEBDDD59FCB21830E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_DebtInstrumentPossibleForgivenessPeriod_E080367FFC84E03DEBDDD59FCB21830E" xlink:to="lab_it_DebtInstrumentPossibleForgivenessPeriod_E080367FFC84E03DEBDDD59FCB21830E" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtInstrumentInterestRateDuringPeriod_30974F12D40478FBD6BBD59FCB21CAE9_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateDuringPeriod_30974F12D40478FBD6BBD59FCB21CAE9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Weighted average annual effect rate </link:label>
<link:label id="lab_us-gaap_DebtInstrumentInterestRateDuringPeriod_30974F12D40478FBD6BBD59FCB21CAE9_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateDuringPeriod_30974F12D40478FBD6BBD59FCB21CAE9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Interest Rate During Period </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentInterestRateDuringPeriod" xlink:label="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_30974F12D40478FBD6BBD59FCB21CAE9" xlink:type="locator"/>
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<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_310430E18EB0D959D540B8A6BB66F15F_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_8DF50620A04950B7987146611F433C05" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2019 </link:label>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_310430E18EB0D959D540B8A6BB66F15F_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_8DF50620A04950B7987146611F433C05" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments Due, Next Twelve Months </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_8DF50620A04950B7987146611F433C05" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_8DF50620A04950B7987146611F433C05" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_8DF50620A04950B7987146611F433C05" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_2514E0036A9A3E5FD5CFB8A6BB66A064_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_5F90A182BC215D0F827B4C1D299B0E16" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2020 </link:label>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_2514E0036A9A3E5FD5CFB8A6BB66A064_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_5F90A182BC215D0F827B4C1D299B0E16" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments, Due in Two Years </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_5F90A182BC215D0F827B4C1D299B0E16" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_5F90A182BC215D0F827B4C1D299B0E16" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_5F90A182BC215D0F827B4C1D299B0E16" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_6D130ABEB2AFAFBDA998B8A6BB66D8FC_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_501D6A17ED66541F97AEA6167B1386A2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2021 </link:label>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_6D130ABEB2AFAFBDA998B8A6BB66D8FC_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_501D6A17ED66541F97AEA6167B1386A2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments, Due in Three Years </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_501D6A17ED66541F97AEA6167B1386A2" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_501D6A17ED66541F97AEA6167B1386A2" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_501D6A17ED66541F97AEA6167B1386A2" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_484E9F78E29E65BFFF10B8A6BB67D7A1_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_46CF8732D79159E98F4BC70EF1425792" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2022 </link:label>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_484E9F78E29E65BFFF10B8A6BB67D7A1_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_46CF8732D79159E98F4BC70EF1425792" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments, Due in Four Years </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_46CF8732D79159E98F4BC70EF1425792" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_46CF8732D79159E98F4BC70EF1425792" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_46CF8732D79159E98F4BC70EF1425792" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_19C1973311F0008A1E6DB8A6BB67025D_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_F8B598B2EE7158C1B017B533FD996955" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2023 </link:label>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_19C1973311F0008A1E6DB8A6BB67025D_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_F8B598B2EE7158C1B017B533FD996955" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments, Due in Five Years </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_F8B598B2EE7158C1B017B533FD996955" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_F8B598B2EE7158C1B017B533FD996955" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_F8B598B2EE7158C1B017B533FD996955" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_C1D5B44E4F84922DB44BB8A6BB67D2F5_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_745ECA0632265A93A083953F8C5A1C4E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Thereafter </link:label>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_C1D5B44E4F84922DB44BB8A6BB67D2F5_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_745ECA0632265A93A083953F8C5A1C4E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments, Due Thereafter </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_745ECA0632265A93A083953F8C5A1C4E" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_745ECA0632265A93A083953F8C5A1C4E" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_745ECA0632265A93A083953F8C5A1C4E" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_7846F1446963E5F463A4B8A6BB67D525_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_1547A44E1754541CBC0D582DF378EBDE" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Total minimum lease payments </link:label>
<link:label id="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_7846F1446963E5F463A4B8A6BB67D525_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_1547A44E1754541CBC0D582DF378EBDE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Future Minimum Payments Due </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_1547A44E1754541CBC0D582DF378EBDE" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_1547A44E1754541CBC0D582DF378EBDE" xlink:to="lab_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_1547A44E1754541CBC0D582DF378EBDE" xlink:type="arc"/>
<link:label id="lab_us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue_FA091394FE16C1299353B8A6BB684C30_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue_7D66BFE6951E5D8CBD95CA4B5A87A5F9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Sublease income </link:label>
<link:label id="lab_us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue_FA091394FE16C1299353B8A6BB684C30_label_en-US" xlink:label="lab_us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue_7D66BFE6951E5D8CBD95CA4B5A87A5F9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Operating Leases, Income Statement, Sublease Revenue </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue" xlink:label="loc_us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue_7D66BFE6951E5D8CBD95CA4B5A87A5F9" xlink:type="locator"/>
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<link:label id="lab_it_NumberofEnterprisesServed_4ECDC5C2E1A13B1BD42920DE8662A416_verboseLabel_en-US" xlink:label="lab_it_NumberofEnterprisesServed_4ECDC5C2E1A13B1BD42920DE8662A416" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Number of organizations Company serves </link:label>
<link:label id="lab_it_NumberofEnterprisesServed_4ECDC5C2E1A13B1BD42920DE8662A416_label_en-US" xlink:label="lab_it_NumberofEnterprisesServed_4ECDC5C2E1A13B1BD42920DE8662A416" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Number of Enterprises Served </link:label>
<link:label id="lab_it_NumberofEnterprisesServed_4ECDC5C2E1A13B1BD42920DE8662A416_documentation_en-US" xlink:label="lab_it_NumberofEnterprisesServed_4ECDC5C2E1A13B1BD42920DE8662A416" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Number of Enterprises Served </link:label>
<link:loc xlink:href="it-20190930.xsd#it_NumberofEnterprisesServed" xlink:label="loc_it_NumberofEnterprisesServed_4ECDC5C2E1A13B1BD42920DE8662A416" xlink:type="locator"/>
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<link:label id="lab_us-gaap_NumberOfCountriesInWhichEntityOperates_94ECD171AF0067893E8620DE86622A00_terseLabel_en-US" xlink:label="lab_us-gaap_NumberOfCountriesInWhichEntityOperates_94ECD171AF0067893E8620DE86622A00" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of countries in which entity operates </link:label>
<link:label id="lab_us-gaap_NumberOfCountriesInWhichEntityOperates_94ECD171AF0067893E8620DE86622A00_label_en-US" xlink:label="lab_us-gaap_NumberOfCountriesInWhichEntityOperates_94ECD171AF0067893E8620DE86622A00" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Number of Countries in which Entity Operates </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NumberOfCountriesInWhichEntityOperates" xlink:label="loc_us-gaap_NumberOfCountriesInWhichEntityOperates_94ECD171AF0067893E8620DE86622A00" xlink:type="locator"/>
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<link:label id="lab_us-gaap_NumberOfReportableSegments_B47253B3BEBBB5266C0520DE8663FE39_terseLabel_en-US" xlink:label="lab_us-gaap_NumberOfReportableSegments_B47253B3BEBBB5266C0520DE8663FE39" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Number of reportable segments </link:label>
<link:label id="lab_us-gaap_NumberOfReportableSegments_B47253B3BEBBB5266C0520DE8663FE39_label_en-US" xlink:label="lab_us-gaap_NumberOfReportableSegments_B47253B3BEBBB5266C0520DE8663FE39" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Number of Reportable Segments </link:label>
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<link:label id="lab_us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock_C55D8B9DD8168CEFA4838E6204ED5ADB_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock_C55D8B9DD8168CEFA4838E6204ED5ADB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of stock-based compensation expense by award type </link:label>
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<link:label id="lab_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_B03B8812944E7309E1BB8E6204EED1F3_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_B03B8812944E7309E1BB8E6204EED1F3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of stock-based compensation expense by expense category </link:label>
<link:label id="lab_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_B03B8812944E7309E1BB8E6204EED1F3_label_en-US" xlink:label="lab_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_B03B8812944E7309E1BB8E6204EED1F3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] </link:label>
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<link:label id="lab_us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock_EED72A5949A213A1D88C8E6204EE566B_terseLabel_en-US" xlink:label="lab_us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock_EED72A5949A213A1D88C8E6204EE566B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of summary of the changes in SARS, RSUs, and CSEs outstanding </link:label>
<link:label id="lab_us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock_EED72A5949A213A1D88C8E6204EE566B_label_en-US" xlink:label="lab_us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock_EED72A5949A213A1D88C8E6204EE566B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] </link:label>
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<link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationStockAppreciationRightsAwardActivityTableTextBlock_C0B6A4D3284C8CA5BC5F8E6204EEC4C9_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationStockAppreciationRightsAwardActivityTableTextBlock_C0B6A4D3284C8CA5BC5F8E6204EEC4C9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of fair value assumptions of SARs </link:label>
<link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationStockAppreciationRightsAwardActivityTableTextBlock_C0B6A4D3284C8CA5BC5F8E6204EEC4C9_label_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationStockAppreciationRightsAwardActivityTableTextBlock_C0B6A4D3284C8CA5BC5F8E6204EEC4C9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Share-based Payment Arrangement, Stock Appreciation Right, Activity [Table Text Block] </link:label>
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<link:label id="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_C32E311E3477E9A411DFB8A6B8E57584_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_A0658D4880EC5EE2ADE03EE7DEC83C50" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of assets and liabilities that are remeasured to fair value </link:label>
<link:label id="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_C32E311E3477E9A411DFB8A6B8E57584_label_en-US" xlink:label="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_A0658D4880EC5EE2ADE03EE7DEC83C50" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] </link:label>
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<link:label id="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_DADE9563D43F13A01F911D72FC013C0C_label_en-US" xlink:label="lab_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_DADE9563D43F13A01F911D72FC013C0C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Schedule of Segment Reporting Information, by Segment [Table] </link:label>
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<link:label id="lab_srt_ConsolidationItemsAxis_DB4CFE6A72AE9C3FE0611D72FC031A52_terseLabel_en-US" xlink:label="lab_srt_ConsolidationItemsAxis_DB4CFE6A72AE9C3FE0611D72FC031A52" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Consolidation Items [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ConsolidationItemsAxis" xlink:label="loc_srt_ConsolidationItemsAxis_DB4CFE6A72AE9C3FE0611D72FC031A52" xlink:type="locator"/>
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<link:label id="lab_us-gaap_IntersegmentEliminationMember_6ED495825D8B74234C351D72FC0313DF_terseLabel_en-US" xlink:label="lab_us-gaap_IntersegmentEliminationMember_6ED495825D8B74234C351D72FC0313DF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Intersegment revenues </link:label>
<link:label id="lab_us-gaap_IntersegmentEliminationMember_6ED495825D8B74234C351D72FC0313DF_label_en-US" xlink:label="lab_us-gaap_IntersegmentEliminationMember_6ED495825D8B74234C351D72FC0313DF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Intersegment Eliminations [Member] </link:label>
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<link:label id="lab_us-gaap_SegmentReportingInformationLineItems_8566A2AE4EF3E17D597C1D72FC048F1B_label_en-US" xlink:label="lab_us-gaap_SegmentReportingInformationLineItems_8566A2AE4EF3E17D597C1D72FC048F1B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Segment Reporting Information [Line Items] </link:label>
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<link:label id="lab_us-gaap_OperatingIncomeLoss_85378AD85330C7D847941D72FC040C0F_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_85378AD85330C7D847941D72FC040C0F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Operating income </link:label>
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<link:label id="lab_us-gaap_TimingOfTransferOfGoodOrServiceAxis_AA3A85B6B7578521CD54B8A6BBE27886_terseLabel_en-US" xlink:label="lab_us-gaap_TimingOfTransferOfGoodOrServiceAxis_4430AA699E90566B960C29A8E4CCA49C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Timing of Transfer of Good or Service [Axis] </link:label>
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<link:label id="lab_it_NumberOfBusinessesSold_CAF774B175727FC57E7C1D6B644B6E9B_documentation_en-US" xlink:label="lab_it_NumberOfBusinessesSold_CAF774B175727FC57E7C1D6B644B6E9B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Number Of Businesses Sold </link:label>
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<link:label id="lab_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_CDA9F92D41A0745BFA6C1D6B644B112B_terseLabel_en-US" xlink:label="lab_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_CDA9F92D41A0745BFA6C1D6B644B112B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Disposal group, revenue </link:label>
<link:label id="lab_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_CDA9F92D41A0745BFA6C1D6B644B112B_label_en-US" xlink:label="lab_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_CDA9F92D41A0745BFA6C1D6B644B112B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Disposal Group, Including Discontinued Operation, Revenue </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_CDA9F92D41A0745BFA6C1D6B644B112B" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss_9B95DB54F4ADAFD00F721D6B644B5A9D_terseLabel_en-US" xlink:label="lab_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss_9B95DB54F4ADAFD00F721D6B644B5A9D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Disposal group, pre-tax income </link:label>
<link:label id="lab_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss_9B95DB54F4ADAFD00F721D6B644B5A9D_label_en-US" xlink:label="lab_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss_9B95DB54F4ADAFD00F721D6B644B5A9D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Disposal Group, Including Discontinued Operation, Operating Income (Loss) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss_9B95DB54F4ADAFD00F721D6B644B5A9D" xlink:type="locator"/>
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<link:label id="lab_us-gaap_ProceedsFromDivestitureOfBusinesses_A8E27ED2F7CE5D8721721D6B644B8113_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromDivestitureOfBusinesses_A8E27ED2F7CE5D8721721D6B644B8113" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Cash received from divestitures </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_A8E27ED2F7CE5D8721721D6B644B8113" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_9219A315084B52A92D851D6B644B4456_verboseLabel_en-US" xlink:label="lab_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_9219A315084B52A92D851D6B644B4456" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Gain (loss) from divested operations </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax" xlink:label="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_9219A315084B52A92D851D6B644B4456" xlink:type="locator"/>
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<link:label id="lab_us-gaap_EquitySecuritiesFvNiUnrealizedGain_6CCF3F82FB017E37044D1D6B644C19B4_terseLabel_en-US" xlink:label="lab_us-gaap_EquitySecuritiesFvNiUnrealizedGain_6CCF3F82FB017E37044D1D6B644C19B4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Unrealized appreciation </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquitySecuritiesFvNiUnrealizedGain" xlink:label="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGain_6CCF3F82FB017E37044D1D6B644C19B4" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EquitySecuritiesFvNiUnrealizedGain_6CCF3F82FB017E37044D1D6B644C19B4" xlink:to="lab_us-gaap_EquitySecuritiesFvNiUnrealizedGain_6CCF3F82FB017E37044D1D6B644C19B4" xlink:type="arc"/>
<link:label id="lab_us-gaap_EquitySecuritiesFvNi_00ACDF7DA33D27DA98261D6B644C79B9_terseLabel_en-US" xlink:label="lab_us-gaap_EquitySecuritiesFvNi_00ACDF7DA33D27DA98261D6B644C79B9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Minority equity investment fair value </link:label>
<link:label id="lab_us-gaap_EquitySecuritiesFvNi_00ACDF7DA33D27DA98261D6B644C79B9_label_en-US" xlink:label="lab_us-gaap_EquitySecuritiesFvNi_00ACDF7DA33D27DA98261D6B644C79B9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Equity Securities, FV-NI </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquitySecuritiesFvNi" xlink:label="loc_us-gaap_EquitySecuritiesFvNi_00ACDF7DA33D27DA98261D6B644C79B9" xlink:type="locator"/>
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<link:label id="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_E0931425F9502FE053451D6B644CC919_verboseLabel_en-US" xlink:label="lab_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_E0931425F9502FE053451D6B644CC919" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Cash and cash equivalents and restricted cash, beginning of period </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_E0931425F9502FE053451D6B644CC919" xlink:type="locator"/>
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<link:label id="lab_us-gaap_RestrictedCash_6935890ACE93CDB453491D6B644CB9C2_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedCash_6935890ACE93CDB453491D6B644CB9C2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Restricted cash </link:label>
<link:label id="lab_us-gaap_RestrictedCash_6935890ACE93CDB453491D6B644CB9C2_label_en-US" xlink:label="lab_us-gaap_RestrictedCash_6935890ACE93CDB453491D6B644CB9C2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Restricted Cash </link:label>
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<link:label id="lab_us-gaap_OperatingLeaseLiability_245CC6D8523AF5B06DFC1D6B644D9D90_netLabel_en-US" xlink:label="lab_us-gaap_OperatingLeaseLiability_245CC6D8523AF5B06DFC1D6B644D9D90" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:type="resource" xml:lang="en-US"> Lease liabilities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_245CC6D8523AF5B06DFC1D6B644D9D90" xlink:type="locator"/>
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<link:label id="lab_us-gaap_Assets_4AA669F39A683979BB111D6B644D4070_terseLabel_en-US" xlink:label="lab_us-gaap_Assets_4AA669F39A683979BB111D6B644D4070" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Total Assets </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_4AA669F39A683979BB111D6B644D4070" xlink:type="locator"/>
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<link:label id="lab_us-gaap_Liabilities_B790D76AA90C4B823B7E1D6B644DAB37_terseLabel_en-US" xlink:label="lab_us-gaap_Liabilities_B790D76AA90C4B823B7E1D6B644DAB37" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Total Liabilities </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_B790D76AA90C4B823B7E1D6B644DAB37" xlink:type="locator"/>
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<link:label id="lab_us-gaap_LesseeOperatingLeaseRenewalTerm_49C7ED14295AA60984721D6CF49F51A3_terseLabel_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseRenewalTerm_49C7ED14295AA60984721D6CF49F51A3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Renewal term </link:label>
<link:label id="lab_us-gaap_LesseeOperatingLeaseRenewalTerm_49C7ED14295AA60984721D6CF49F51A3_label_en-US" xlink:label="lab_us-gaap_LesseeOperatingLeaseRenewalTerm_49C7ED14295AA60984721D6CF49F51A3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Renewal Term </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseRenewalTerm" xlink:label="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_49C7ED14295AA60984721D6CF49F51A3" xlink:type="locator"/>
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<link:label id="lab_it_LesseeOperatingLeaseOptiontoTerminateTerm_D025BA8D870CDBC0EB781D71781F707C_terseLabel_en-US" xlink:label="lab_it_LesseeOperatingLeaseOptiontoTerminateTerm_D025BA8D870CDBC0EB781D71781F707C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Option to terminate, term </link:label>
<link:label id="lab_it_LesseeOperatingLeaseOptiontoTerminateTerm_D025BA8D870CDBC0EB781D71781F707C_label_en-US" xlink:label="lab_it_LesseeOperatingLeaseOptiontoTerminateTerm_D025BA8D870CDBC0EB781D71781F707C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Option to Terminate, Term </link:label>
<link:label id="lab_it_LesseeOperatingLeaseOptiontoTerminateTerm_D025BA8D870CDBC0EB781D71781F707C_documentation_en-US" xlink:label="lab_it_LesseeOperatingLeaseOptiontoTerminateTerm_D025BA8D870CDBC0EB781D71781F707C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Lessee, Operating Lease, Option to Terminate, Term </link:label>
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<link:label id="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_931ED631BD79171911BDE65906B95272_terseLabel_en-US" xlink:label="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_0FE081B6BB6F5A8A9F3D49070FB091CE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Antidilutive securities excluded from computation of (loss) income per share (in shares) </link:label>
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<link:label id="lab_it_NumeratorAbstract_75FCBC04FE2267C2C2D229D61A05B6E1_terseLabel_en-US" xlink:label="lab_it_NumeratorAbstract_37ED8F9AAF1A5330B83EB6595CED49B3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Numerator: </link:label>
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<link:label id="lab_us-gaap_NetIncomeLoss_493D02F490DE678BA15929D61A052D27_verboseLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_DC758A5E8F415C9E9D7A90E054D51E2D" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US"> Net income used for calculating basic and diluted income per common share </link:label>
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<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_19C920140812860B59750332121CA3C1_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_19C920140812860B59750332121CA3C1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Comprehensive Income (Loss), before Reclassifications, Net of Tax </link:label>
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<link:label id="lab_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_C06A3955C8A06AA792190332121C2AE1_label_en-US" xlink:label="lab_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_C06A3955C8A06AA792190332121C2AE1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_C06A3955C8A06AA792190332121C2AE1" xlink:type="locator"/>
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<link:label id="lab_us-gaap_StockholdersEquity_FAE836BC6ADFFD7881380332121C4A5D_periodEndLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquity_FAE836BC6ADFFD7881380332121C4A5D" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US"> Ending balance </link:label>
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<link:label id="lab_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_992F9502359BBC5CC95303950EC1CA02_label_en-US" xlink:label="lab_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_992F9502359BBC5CC95303950EC1CA02" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Cumulative Effect of New Accounting Principle in Period of Adoption </link:label>
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<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_FFFF5AEF5B885A2A62D116F522394818" xlink:type="locator"/>
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<link:label id="lab_us-gaap_HedgingDesignationAxis_2418A6ADBC6756B5B49B16F522397FB3_label_en-US" xlink:label="lab_us-gaap_HedgingDesignationAxis_2418A6ADBC6756B5B49B16F522397FB3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Hedging Designation [Axis] </link:label>
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<link:label id="lab_us-gaap_HedgingDesignationDomain_1DE71895BFE272E9088516F52239BBBB_terseLabel_en-US" xlink:label="lab_us-gaap_HedgingDesignationDomain_1DE71895BFE272E9088516F52239BBBB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Hedging Designation [Domain] </link:label>
<link:label id="lab_us-gaap_HedgingDesignationDomain_1DE71895BFE272E9088516F52239BBBB_label_en-US" xlink:label="lab_us-gaap_HedgingDesignationDomain_1DE71895BFE272E9088516F52239BBBB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Hedging Designation [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_1DE71895BFE272E9088516F52239BBBB" xlink:type="locator"/>
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<link:label id="lab_us-gaap_DesignatedAsHedgingInstrumentMember_9FC2171A0F07E6D25F4316F52239B06F_terseLabel_en-US" xlink:label="lab_us-gaap_DesignatedAsHedgingInstrumentMember_9FC2171A0F07E6D25F4316F52239B06F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Designated as hedging instrument </link:label>
<link:label id="lab_us-gaap_DesignatedAsHedgingInstrumentMember_9FC2171A0F07E6D25F4316F52239B06F_label_en-US" xlink:label="lab_us-gaap_DesignatedAsHedgingInstrumentMember_9FC2171A0F07E6D25F4316F52239B06F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Designated as Hedging Instrument [Member] </link:label>
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<link:label id="lab_us-gaap_NondesignatedMember_8D6561610A5A763E249416F5223ADB6A_terseLabel_en-US" xlink:label="lab_us-gaap_NondesignatedMember_8D6561610A5A763E249416F5223ADB6A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Not Designated as Hedging Instrument </link:label>
<link:label id="lab_us-gaap_NondesignatedMember_8D6561610A5A763E249416F5223ADB6A_label_en-US" xlink:label="lab_us-gaap_NondesignatedMember_8D6561610A5A763E249416F5223ADB6A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Not Designated as Hedging Instrument [Member] </link:label>
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<link:label id="lab_us-gaap_OtherLiabilitiesMember_AE9235446DD304F0394216F5223A1DE0_terseLabel_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesMember_AE9235446DD304F0394216F5223A1DE0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other liabilities </link:label>
<link:label id="lab_us-gaap_OtherLiabilitiesMember_AE9235446DD304F0394216F5223A1DE0_label_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesMember_AE9235446DD304F0394216F5223A1DE0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Other Liabilities [Member] </link:label>
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<link:label id="lab_it_AccruedLiabilitiesCurrentMember_7B9E17C08D1BD66EEA7A16F522409443_terseLabel_en-US" xlink:label="lab_it_AccruedLiabilitiesCurrentMember_7B9E17C08D1BD66EEA7A16F522409443" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Accrued liabilities </link:label>
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<link:label id="lab_us-gaap_ForeignExchangeForwardMember_963D3A82BA0443AF608A16F5224163F4_terseLabel_en-US" xlink:label="lab_us-gaap_ForeignExchangeForwardMember_963D3A82BA0443AF608A16F5224163F4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Foreign currency forwards </link:label>
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<link:label id="lab_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_9301F2CB507255A4C0EA16F522422B84_terseLabel_en-US" xlink:label="lab_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_9301F2CB507255A4C0EA16F522422B84" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Fair Value Asset (Liability), Net </link:label>
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<link:label id="lab_it_OtherLongTermDebtMember_23CF7E813F5ABA3F8D78B8A6BB9054FD_terseLabel_en-US" xlink:label="lab_it_OtherLongTermDebtMember_E8401843031E5167B6F43C0394D7FDA2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other </link:label>
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<link:label id="lab_us-gaap_DebtInstrumentCarryingAmount_682603F23858CE3AC76CB8A6BB9159B3_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentCarryingAmount_ED484D13D5B75F4F865AF2E0BBCB968D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Long-term debt, gross </link:label>
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<link:label id="lab_it_DebtLongtermandShorttermCombinedAmountGross_94A31EE4724FE34EA521B8A6BB929D7A_documentation_en-US" xlink:label="lab_it_DebtLongtermandShorttermCombinedAmountGross_E53732C07F635D75965C9C49C0B948FA" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Debt, Long-term and Short-term, Combined Amount, Gross </link:label>
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<link:label id="lab_us-gaap_DebtLongtermAndShorttermCombinedAmount_9FBCD3D78A76DF9238E7B8A6BB922FE2_totalLabel_en-US" xlink:label="lab_us-gaap_DebtLongtermAndShorttermCombinedAmount_4B3A8764A4F8577FAB676F6D2F3D1051" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US"> Net balance sheet carrying amount </link:label>
<link:label id="lab_us-gaap_DebtLongtermAndShorttermCombinedAmount_9FBCD3D78A76DF9238E7B8A6BB922FE2_label_en-US" xlink:label="lab_us-gaap_DebtLongtermAndShorttermCombinedAmount_4B3A8764A4F8577FAB676F6D2F3D1051" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt, Long-term and Short-term, Combined Amount </link:label>
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<link:label id="lab_us-gaap_ScheduleOfNotionalAmountsOfOutstandingDerivativePositionsTableTextBlock_C57B2E00333B9FECA3D5B8A6BB5FA6A0_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfNotionalAmountsOfOutstandingDerivativePositionsTableTextBlock_FCD231B236935C7EB9F55E599358BB6B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Schedule of information regarding outstanding derivative contracts </link:label>
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<link:label id="lab_us-gaap_EquityAbstract_C94AC6719634BB020D2C033212229F19_label_en-US" xlink:label="lab_us-gaap_EquityAbstract_C94AC6719634BB020D2C033212229F19" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Equity [Abstract] </link:label>
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<link:label id="lab_us-gaap_AdditionalPaidInCapitalMember_0A82FA88E930B0C7BA15033212243722_terseLabel_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalMember_0A82FA88E930B0C7BA15033212243722" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Additional Paid-In Capital </link:label>
<link:label id="lab_us-gaap_AdditionalPaidInCapitalMember_0A82FA88E930B0C7BA15033212243722_label_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapitalMember_0A82FA88E930B0C7BA15033212243722" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Additional Paid-in Capital [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_0A82FA88E930B0C7BA15033212243722" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdditionalPaidInCapitalMember_0A82FA88E930B0C7BA15033212243722" xlink:to="lab_us-gaap_AdditionalPaidInCapitalMember_0A82FA88E930B0C7BA15033212243722" xlink:type="arc"/>
<link:label id="lab_us-gaap_TreasuryStockMember_96B2E857E7BF9FBE622C033212249CFD_terseLabel_en-US" xlink:label="lab_us-gaap_TreasuryStockMember_96B2E857E7BF9FBE622C033212249CFD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Treasury Stock </link:label>
<link:label id="lab_us-gaap_TreasuryStockMember_96B2E857E7BF9FBE622C033212249CFD_label_en-US" xlink:label="lab_us-gaap_TreasuryStockMember_96B2E857E7BF9FBE622C033212249CFD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Treasury Stock [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TreasuryStockMember" xlink:label="loc_us-gaap_TreasuryStockMember_96B2E857E7BF9FBE622C033212249CFD" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TreasuryStockMember_96B2E857E7BF9FBE622C033212249CFD" xlink:to="lab_us-gaap_TreasuryStockMember_96B2E857E7BF9FBE622C033212249CFD" xlink:type="arc"/>
<link:label id="lab_us-gaap_ClassOfStockLineItems_942567CE713D00805CA3033212249124_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfStockLineItems_942567CE713D00805CA3033212249124" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Class of Stock [Line Items] </link:label>
<link:label id="lab_us-gaap_ClassOfStockLineItems_942567CE713D00805CA3033212249124_label_en-US" xlink:label="lab_us-gaap_ClassOfStockLineItems_942567CE713D00805CA3033212249124" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Class of Stock [Line Items] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockLineItems" xlink:label="loc_us-gaap_ClassOfStockLineItems_942567CE713D00805CA3033212249124" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfStockLineItems_942567CE713D00805CA3033212249124" xlink:to="lab_us-gaap_ClassOfStockLineItems_942567CE713D00805CA3033212249124" xlink:type="arc"/>
<link:label id="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_BD6A03CFC2B52C2F699803321224DBAB_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_BD6A03CFC2B52C2F699803321224DBAB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Stockholders' Equity [Roll Forward] </link:label>
<link:label id="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_BD6A03CFC2B52C2F699803321224DBAB_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_BD6A03CFC2B52C2F699803321224DBAB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Increase (Decrease) in Stockholders' Equity [Roll Forward] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_BD6A03CFC2B52C2F699803321224DBAB" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_BD6A03CFC2B52C2F699803321224DBAB" xlink:to="lab_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_BD6A03CFC2B52C2F699803321224DBAB" xlink:type="arc"/>
<link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax_A3CE97D1792E6676AE4D033212258B03_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax_A3CE97D1792E6676AE4D033212258B03" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Other comprehensive income (loss) </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_A3CE97D1792E6676AE4D033212258B03" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_A3CE97D1792E6676AE4D033212258B03" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax_A3CE97D1792E6676AE4D033212258B03" xlink:type="arc"/>
<link:label id="lab_us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_0D2B6416EAD5EF88AFD903321225A75F_terseLabel_en-US" xlink:label="lab_us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_0D2B6416EAD5EF88AFD903321225A75F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Issuances under stock plans </link:label>
<link:label id="lab_us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_0D2B6416EAD5EF88AFD903321225A75F_label_en-US" xlink:label="lab_us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_0D2B6416EAD5EF88AFD903321225A75F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Shares Granted, Value, Share-based Payment Arrangement, after Forfeiture </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation" xlink:label="loc_us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_0D2B6416EAD5EF88AFD903321225A75F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_0D2B6416EAD5EF88AFD903321225A75F" xlink:to="lab_us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_0D2B6416EAD5EF88AFD903321225A75F" xlink:type="arc"/>
<link:label id="lab_us-gaap_StockRepurchasedDuringPeriodValue_9D8B1CC3B682C825BA9D03321226A1F7_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_StockRepurchasedDuringPeriodValue_9D8B1CC3B682C825BA9D03321226A1F7" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US"> Common share repurchases </link:label>
<link:label id="lab_us-gaap_StockRepurchasedDuringPeriodValue_9D8B1CC3B682C825BA9D03321226A1F7_label_en-US" xlink:label="lab_us-gaap_StockRepurchasedDuringPeriodValue_9D8B1CC3B682C825BA9D03321226A1F7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Stock Repurchased During Period, Value </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodValue" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_9D8B1CC3B682C825BA9D03321226A1F7" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockRepurchasedDuringPeriodValue_9D8B1CC3B682C825BA9D03321226A1F7" xlink:to="lab_us-gaap_StockRepurchasedDuringPeriodValue_9D8B1CC3B682C825BA9D03321226A1F7" xlink:type="arc"/>
<link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_B3C0FA678E12A47AD87403321226114C_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_B3C0FA678E12A47AD87403321226114C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Stock-based compensation expense </link:label>
<link:label id="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_B3C0FA678E12A47AD87403321226114C_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_B3C0FA678E12A47AD87403321226114C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> APIC, Share-based Payment Arrangement, Increase for Cost Recognition </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_B3C0FA678E12A47AD87403321226114C" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_B3C0FA678E12A47AD87403321226114C" xlink:to="lab_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_B3C0FA678E12A47AD87403321226114C" xlink:type="arc"/>
<link:label id="lab_it_A2016CreditFacilityAgreementMember_12C1F5A446025C8ED0F816F522FB5B55_terseLabel_en-US" xlink:label="lab_it_A2016CreditFacilityAgreementMember_12C1F5A446025C8ED0F816F522FB5B55" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> 2016 Agreement </link:label>
<link:label id="lab_it_A2016CreditFacilityAgreementMember_12C1F5A446025C8ED0F816F522FB5B55_label_en-US" xlink:label="lab_it_A2016CreditFacilityAgreementMember_12C1F5A446025C8ED0F816F522FB5B55" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> 2016 Credit Facility Agreement [Member] </link:label>
<link:label id="lab_it_A2016CreditFacilityAgreementMember_12C1F5A446025C8ED0F816F522FB5B55_documentation_en-US" xlink:label="lab_it_A2016CreditFacilityAgreementMember_12C1F5A446025C8ED0F816F522FB5B55" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> 2016 Credit Facility Agreement [Member] </link:label>
<link:loc xlink:href="it-20190930.xsd#it_A2016CreditFacilityAgreementMember" xlink:label="loc_it_A2016CreditFacilityAgreementMember_12C1F5A446025C8ED0F816F522FB5B55" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_A2016CreditFacilityAgreementMember_12C1F5A446025C8ED0F816F522FB5B55" xlink:to="lab_it_A2016CreditFacilityAgreementMember_12C1F5A446025C8ED0F816F522FB5B55" xlink:type="arc"/>
<link:label id="lab_us-gaap_SecuredDebtMember_6DCAA64E01F89491917D16F523013FE8_terseLabel_en-US" xlink:label="lab_us-gaap_SecuredDebtMember_6DCAA64E01F89491917D16F523013FE8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Term loans </link:label>
<link:label id="lab_us-gaap_SecuredDebtMember_6DCAA64E01F89491917D16F523013FE8_label_en-US" xlink:label="lab_us-gaap_SecuredDebtMember_6DCAA64E01F89491917D16F523013FE8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Secured Debt [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SecuredDebtMember" xlink:label="loc_us-gaap_SecuredDebtMember_6DCAA64E01F89491917D16F523013FE8" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SecuredDebtMember_6DCAA64E01F89491917D16F523013FE8" xlink:to="lab_us-gaap_SecuredDebtMember_6DCAA64E01F89491917D16F523013FE8" xlink:type="arc"/>
<link:label id="lab_us-gaap_VariableRateAxis_10462FB7AFBC7465CF8A16F52302DD30_terseLabel_en-US" xlink:label="lab_us-gaap_VariableRateAxis_10462FB7AFBC7465CF8A16F52302DD30" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Variable Rate [Axis] </link:label>
<link:label id="lab_us-gaap_VariableRateAxis_10462FB7AFBC7465CF8A16F52302DD30_label_en-US" xlink:label="lab_us-gaap_VariableRateAxis_10462FB7AFBC7465CF8A16F52302DD30" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Variable Rate [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VariableRateAxis" xlink:label="loc_us-gaap_VariableRateAxis_10462FB7AFBC7465CF8A16F52302DD30" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableRateAxis_10462FB7AFBC7465CF8A16F52302DD30" xlink:to="lab_us-gaap_VariableRateAxis_10462FB7AFBC7465CF8A16F52302DD30" xlink:type="arc"/>
<link:label id="lab_us-gaap_VariableRateDomain_315836318D699CC24F8316F5230264F2_terseLabel_en-US" xlink:label="lab_us-gaap_VariableRateDomain_315836318D699CC24F8316F5230264F2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Variable Rate [Domain] </link:label>
<link:label id="lab_us-gaap_VariableRateDomain_315836318D699CC24F8316F5230264F2_label_en-US" xlink:label="lab_us-gaap_VariableRateDomain_315836318D699CC24F8316F5230264F2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Variable Rate [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_315836318D699CC24F8316F5230264F2" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_VariableRateDomain_315836318D699CC24F8316F5230264F2" xlink:to="lab_us-gaap_VariableRateDomain_315836318D699CC24F8316F5230264F2" xlink:type="arc"/>
<link:label id="lab_it_FederalFundsRateMember_BE964AD3CA4EE7D26AB216F523033F41_terseLabel_en-US" xlink:label="lab_it_FederalFundsRateMember_BE964AD3CA4EE7D26AB216F523033F41" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Federal Funds Rate </link:label>
<link:label id="lab_it_FederalFundsRateMember_BE964AD3CA4EE7D26AB216F523033F41_label_en-US" xlink:label="lab_it_FederalFundsRateMember_BE964AD3CA4EE7D26AB216F523033F41" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Federal Funds Rate [Member] </link:label>
<link:label id="lab_it_FederalFundsRateMember_BE964AD3CA4EE7D26AB216F523033F41_documentation_en-US" xlink:label="lab_it_FederalFundsRateMember_BE964AD3CA4EE7D26AB216F523033F41" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> -- None. No documentation exists for this element. -- </link:label>
<link:loc xlink:href="it-20190930.xsd#it_FederalFundsRateMember" xlink:label="loc_it_FederalFundsRateMember_BE964AD3CA4EE7D26AB216F523033F41" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_FederalFundsRateMember_BE964AD3CA4EE7D26AB216F523033F41" xlink:to="lab_it_FederalFundsRateMember_BE964AD3CA4EE7D26AB216F523033F41" xlink:type="arc"/>
<link:label id="lab_it_EuroDollarRateMember_83F8253E334BD4C4DD4E16F52303885B_terseLabel_en-US" xlink:label="lab_it_EuroDollarRateMember_83F8253E334BD4C4DD4E16F52303885B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Euro Dollar rate </link:label>
<link:label id="lab_it_EuroDollarRateMember_83F8253E334BD4C4DD4E16F52303885B_label_en-US" xlink:label="lab_it_EuroDollarRateMember_83F8253E334BD4C4DD4E16F52303885B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Euro Dollar Rate [Member] </link:label>
<link:label id="lab_it_EuroDollarRateMember_83F8253E334BD4C4DD4E16F52303885B_documentation_en-US" xlink:label="lab_it_EuroDollarRateMember_83F8253E334BD4C4DD4E16F52303885B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> -- None. No documentation exists for this element. -- </link:label>
<link:loc xlink:href="it-20190930.xsd#it_EuroDollarRateMember" xlink:label="loc_it_EuroDollarRateMember_83F8253E334BD4C4DD4E16F52303885B" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_EuroDollarRateMember_83F8253E334BD4C4DD4E16F52303885B" xlink:to="lab_it_EuroDollarRateMember_83F8253E334BD4C4DD4E16F52303885B" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodAxis_5F1A8D0786DD1A2FA84816F52303C250_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodAxis_5F1A8D0786DD1A2FA84816F52303C250" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Redemption, Period [Axis] </link:label>
<link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodAxis_5F1A8D0786DD1A2FA84816F52303C250_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodAxis_5F1A8D0786DD1A2FA84816F52303C250" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Redemption, Period [Axis] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodAxis" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_5F1A8D0786DD1A2FA84816F52303C250" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_5F1A8D0786DD1A2FA84816F52303C250" xlink:to="lab_us-gaap_DebtInstrumentRedemptionPeriodAxis_5F1A8D0786DD1A2FA84816F52303C250" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodDomain_C985D304FB5021F00FC216F523037C8F_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodDomain_C985D304FB5021F00FC216F523037C8F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Redemption, Period [Domain] </link:label>
<link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodDomain_C985D304FB5021F00FC216F523037C8F_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodDomain_C985D304FB5021F00FC216F523037C8F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Redemption, Period [Domain] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_C985D304FB5021F00FC216F523037C8F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_C985D304FB5021F00FC216F523037C8F" xlink:to="lab_us-gaap_DebtInstrumentRedemptionPeriodDomain_C985D304FB5021F00FC216F523037C8F" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodOneMember_85696B935CC41C62F75516F523037AA3_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodOneMember_85696B935CC41C62F75516F523037AA3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt instrument, redemption with the proceeds of certain equity offerings </link:label>
<link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodOneMember_85696B935CC41C62F75516F523037AA3_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodOneMember_85696B935CC41C62F75516F523037AA3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Redemption, Period One [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodOneMember" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_85696B935CC41C62F75516F523037AA3" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_85696B935CC41C62F75516F523037AA3" xlink:to="lab_us-gaap_DebtInstrumentRedemptionPeriodOneMember_85696B935CC41C62F75516F523037AA3" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_4635F72F02E0C22C847116F52304F5DF_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_4635F72F02E0C22C847116F52304F5DF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt instrument, redemption excluding make whole premium </link:label>
<link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_4635F72F02E0C22C847116F52304F5DF_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_4635F72F02E0C22C847116F52304F5DF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Redemption, Period Two [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodTwoMember" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_4635F72F02E0C22C847116F52304F5DF" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_4635F72F02E0C22C847116F52304F5DF" xlink:to="lab_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_4635F72F02E0C22C847116F52304F5DF" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_CFE049D450BEB15300A716F52304BE7F_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_CFE049D450BEB15300A716F52304BE7F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt instrument, redemption due to specific kinds of change of control </link:label>
<link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_CFE049D450BEB15300A716F52304BE7F_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_CFE049D450BEB15300A716F52304BE7F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Redemption, Period Three [Member] </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodThreeMember" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_CFE049D450BEB15300A716F52304BE7F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_CFE049D450BEB15300A716F52304BE7F" xlink:to="lab_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_CFE049D450BEB15300A716F52304BE7F" xlink:type="arc"/>
<link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_6CC84978F87343F4010216F523049DEF_terseLabel_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_6CC84978F87343F4010216F523049DEF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Line of credit facility, maximum borrowing capacity </link:label>
<link:label id="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_6CC84978F87343F4010216F523049DEF_label_en-US" xlink:label="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_6CC84978F87343F4010216F523049DEF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Maximum Borrowing Capacity </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_6CC84978F87343F4010216F523049DEF" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_6CC84978F87343F4010216F523049DEF" xlink:to="lab_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_6CC84978F87343F4010216F523049DEF" xlink:type="arc"/>
<link:label id="lab_it_LineofCreditFacilityFrequencyofPaymentsNumberofQuarterlyInstallments_02F23D6B7542E698F05F16F523051E55_terseLabel_en-US" xlink:label="lab_it_LineofCreditFacilityFrequencyofPaymentsNumberofQuarterlyInstallments_02F23D6B7542E698F05F16F523051E55" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Line of credit facility, frequency of payments, number of quarterly installments </link:label>
<link:label id="lab_it_LineofCreditFacilityFrequencyofPaymentsNumberofQuarterlyInstallments_02F23D6B7542E698F05F16F523051E55_label_en-US" xlink:label="lab_it_LineofCreditFacilityFrequencyofPaymentsNumberofQuarterlyInstallments_02F23D6B7542E698F05F16F523051E55" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Frequency of Payments, Number of Quarterly Installments </link:label>
<link:label id="lab_it_LineofCreditFacilityFrequencyofPaymentsNumberofQuarterlyInstallments_02F23D6B7542E698F05F16F523051E55_documentation_en-US" xlink:label="lab_it_LineofCreditFacilityFrequencyofPaymentsNumberofQuarterlyInstallments_02F23D6B7542E698F05F16F523051E55" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Line of Credit Facility, Frequency of Payments, Number of Quarterly Installments </link:label>
<link:loc xlink:href="it-20190930.xsd#it_LineofCreditFacilityFrequencyofPaymentsNumberofQuarterlyInstallments" xlink:label="loc_it_LineofCreditFacilityFrequencyofPaymentsNumberofQuarterlyInstallments_02F23D6B7542E698F05F16F523051E55" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_LineofCreditFacilityFrequencyofPaymentsNumberofQuarterlyInstallments_02F23D6B7542E698F05F16F523051E55" xlink:to="lab_it_LineofCreditFacilityFrequencyofPaymentsNumberofQuarterlyInstallments_02F23D6B7542E698F05F16F523051E55" xlink:type="arc"/>
<link:label id="lab_it_DebtInstrumentInterestAdditionalInterestAboveFederalFundRate_5CE18C0A104D7DB71BDC16F52305FD91_terseLabel_en-US" xlink:label="lab_it_DebtInstrumentInterestAdditionalInterestAboveFederalFundRate_5CE18C0A104D7DB71BDC16F52305FD91" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt instrument, interest, additional interest above Federal Fund rate </link:label>
<link:label id="lab_it_DebtInstrumentInterestAdditionalInterestAboveFederalFundRate_5CE18C0A104D7DB71BDC16F52305FD91_label_en-US" xlink:label="lab_it_DebtInstrumentInterestAdditionalInterestAboveFederalFundRate_5CE18C0A104D7DB71BDC16F52305FD91" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument Interest Additional Interest Above Federal Fund Rate </link:label>
<link:label id="lab_it_DebtInstrumentInterestAdditionalInterestAboveFederalFundRate_5CE18C0A104D7DB71BDC16F52305FD91_documentation_en-US" xlink:label="lab_it_DebtInstrumentInterestAdditionalInterestAboveFederalFundRate_5CE18C0A104D7DB71BDC16F52305FD91" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Debt instrument interest additional interest above federal fund rate. </link:label>
<link:loc xlink:href="it-20190930.xsd#it_DebtInstrumentInterestAdditionalInterestAboveFederalFundRate" xlink:label="loc_it_DebtInstrumentInterestAdditionalInterestAboveFederalFundRate_5CE18C0A104D7DB71BDC16F52305FD91" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_DebtInstrumentInterestAdditionalInterestAboveFederalFundRate_5CE18C0A104D7DB71BDC16F52305FD91" xlink:to="lab_it_DebtInstrumentInterestAdditionalInterestAboveFederalFundRate_5CE18C0A104D7DB71BDC16F52305FD91" xlink:type="arc"/>
<link:label id="lab_it_DebtInstrumentInterestAdditionalInterestAboveEurodollarRate_422FB819D206789C7E9916F523054F3F_terseLabel_en-US" xlink:label="lab_it_DebtInstrumentInterestAdditionalInterestAboveEurodollarRate_422FB819D206789C7E9916F523054F3F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt instrument, interest, additional interest above eurodollar rate </link:label>
<link:label id="lab_it_DebtInstrumentInterestAdditionalInterestAboveEurodollarRate_422FB819D206789C7E9916F523054F3F_label_en-US" xlink:label="lab_it_DebtInstrumentInterestAdditionalInterestAboveEurodollarRate_422FB819D206789C7E9916F523054F3F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument Interest Additional Interest Above Euro dollar Rate </link:label>
<link:label id="lab_it_DebtInstrumentInterestAdditionalInterestAboveEurodollarRate_422FB819D206789C7E9916F523054F3F_documentation_en-US" xlink:label="lab_it_DebtInstrumentInterestAdditionalInterestAboveEurodollarRate_422FB819D206789C7E9916F523054F3F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Debt instrument interest additional interest above eurodollar rate. </link:label>
<link:loc xlink:href="it-20190930.xsd#it_DebtInstrumentInterestAdditionalInterestAboveEurodollarRate" xlink:label="loc_it_DebtInstrumentInterestAdditionalInterestAboveEurodollarRate_422FB819D206789C7E9916F523054F3F" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_DebtInstrumentInterestAdditionalInterestAboveEurodollarRate_422FB819D206789C7E9916F523054F3F" xlink:to="lab_it_DebtInstrumentInterestAdditionalInterestAboveEurodollarRate_422FB819D206789C7E9916F523054F3F" xlink:type="arc"/>
<link:label id="lab_it_MinimumApplicableMarginRate_79B00483843AE6C2D73816F523054258_terseLabel_en-US" xlink:label="lab_it_MinimumApplicableMarginRate_79B00483843AE6C2D73816F523054258" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Minimum applicable margin rate </link:label>
<link:label id="lab_it_MinimumApplicableMarginRate_79B00483843AE6C2D73816F523054258_label_en-US" xlink:label="lab_it_MinimumApplicableMarginRate_79B00483843AE6C2D73816F523054258" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Minimum Applicable Margin Rate </link:label>
<link:label id="lab_it_MinimumApplicableMarginRate_79B00483843AE6C2D73816F523054258_documentation_en-US" xlink:label="lab_it_MinimumApplicableMarginRate_79B00483843AE6C2D73816F523054258" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Minimum applicable margin rate. </link:label>
<link:loc xlink:href="it-20190930.xsd#it_MinimumApplicableMarginRate" xlink:label="loc_it_MinimumApplicableMarginRate_79B00483843AE6C2D73816F523054258" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_MinimumApplicableMarginRate_79B00483843AE6C2D73816F523054258" xlink:to="lab_it_MinimumApplicableMarginRate_79B00483843AE6C2D73816F523054258" xlink:type="arc"/>
<link:label id="lab_it_MaximumApplicableMarginRate_66CE49C4EA8D6FFEBB8116F523059A67_terseLabel_en-US" xlink:label="lab_it_MaximumApplicableMarginRate_66CE49C4EA8D6FFEBB8116F523059A67" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Maximum applicable margin rate </link:label>
<link:label id="lab_it_MaximumApplicableMarginRate_66CE49C4EA8D6FFEBB8116F523059A67_label_en-US" xlink:label="lab_it_MaximumApplicableMarginRate_66CE49C4EA8D6FFEBB8116F523059A67" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Maximum Applicable Margin Rate </link:label>
<link:label id="lab_it_MaximumApplicableMarginRate_66CE49C4EA8D6FFEBB8116F523059A67_documentation_en-US" xlink:label="lab_it_MaximumApplicableMarginRate_66CE49C4EA8D6FFEBB8116F523059A67" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Maximum applicable margin rate. </link:label>
<link:loc xlink:href="it-20190930.xsd#it_MaximumApplicableMarginRate" xlink:label="loc_it_MaximumApplicableMarginRate_66CE49C4EA8D6FFEBB8116F523059A67" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_MaximumApplicableMarginRate_66CE49C4EA8D6FFEBB8116F523059A67" xlink:to="lab_it_MaximumApplicableMarginRate_66CE49C4EA8D6FFEBB8116F523059A67" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtInstrumentFaceAmount_B7586FBE6DB6A3C6141116F523052528_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_B7586FBE6DB6A3C6141116F523052528" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Aggregate principal amount </link:label>
<link:label id="lab_us-gaap_DebtInstrumentFaceAmount_B7586FBE6DB6A3C6141116F523052528_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_B7586FBE6DB6A3C6141116F523052528" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Face Amount </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_B7586FBE6DB6A3C6141116F523052528" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentFaceAmount_B7586FBE6DB6A3C6141116F523052528" xlink:to="lab_us-gaap_DebtInstrumentFaceAmount_B7586FBE6DB6A3C6141116F523052528" xlink:type="arc"/>
<link:label id="lab_it_DebtInstrumentIssuePricePercent_72240BCAECFB67411AD516F52306ADB1_terseLabel_en-US" xlink:label="lab_it_DebtInstrumentIssuePricePercent_72240BCAECFB67411AD516F52306ADB1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt instrument, issue price, percent </link:label>
<link:label id="lab_it_DebtInstrumentIssuePricePercent_72240BCAECFB67411AD516F52306ADB1_label_en-US" xlink:label="lab_it_DebtInstrumentIssuePricePercent_72240BCAECFB67411AD516F52306ADB1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Issue Price, Percent </link:label>
<link:label id="lab_it_DebtInstrumentIssuePricePercent_72240BCAECFB67411AD516F52306ADB1_documentation_en-US" xlink:label="lab_it_DebtInstrumentIssuePricePercent_72240BCAECFB67411AD516F52306ADB1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Issue Price, Percent </link:label>
<link:loc xlink:href="it-20190930.xsd#it_DebtInstrumentIssuePricePercent" xlink:label="loc_it_DebtInstrumentIssuePricePercent_72240BCAECFB67411AD516F52306ADB1" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_DebtInstrumentIssuePricePercent_72240BCAECFB67411AD516F52306ADB1" xlink:to="lab_it_DebtInstrumentIssuePricePercent_72240BCAECFB67411AD516F52306ADB1" xlink:type="arc"/>
<link:label id="lab_it_DebtInstrumentRedemptionPricePercentageofPrincipalAmountThatMayBeRedeemed_B62E6F4EC9183694801B16F523060545_terseLabel_en-US" xlink:label="lab_it_DebtInstrumentRedemptionPricePercentageofPrincipalAmountThatMayBeRedeemed_B62E6F4EC9183694801B16F523060545" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt instrument, redemption, prince, percentage of principal amount that may be redeemed </link:label>
<link:label id="lab_it_DebtInstrumentRedemptionPricePercentageofPrincipalAmountThatMayBeRedeemed_B62E6F4EC9183694801B16F523060545_label_en-US" xlink:label="lab_it_DebtInstrumentRedemptionPricePercentageofPrincipalAmountThatMayBeRedeemed_B62E6F4EC9183694801B16F523060545" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Redemption Price, Percentage of Principal Amount That May Be Redeemed </link:label>
<link:label id="lab_it_DebtInstrumentRedemptionPricePercentageofPrincipalAmountThatMayBeRedeemed_B62E6F4EC9183694801B16F523060545_documentation_en-US" xlink:label="lab_it_DebtInstrumentRedemptionPricePercentageofPrincipalAmountThatMayBeRedeemed_B62E6F4EC9183694801B16F523060545" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Redemption Price, Percentage of Principal Amount That May Be Redeemed </link:label>
<link:loc xlink:href="it-20190930.xsd#it_DebtInstrumentRedemptionPricePercentageofPrincipalAmountThatMayBeRedeemed" xlink:label="loc_it_DebtInstrumentRedemptionPricePercentageofPrincipalAmountThatMayBeRedeemed_B62E6F4EC9183694801B16F523060545" xlink:type="locator"/>
<link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_it_DebtInstrumentRedemptionPricePercentageofPrincipalAmountThatMayBeRedeemed_B62E6F4EC9183694801B16F523060545" xlink:to="lab_it_DebtInstrumentRedemptionPricePercentageofPrincipalAmountThatMayBeRedeemed_B62E6F4EC9183694801B16F523060545" xlink:type="arc"/>
<link:label id="lab_us-gaap_DebtInstrumentRedemptionPricePercentage_D3CEEC95BED239C293D016F5230619FD_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPricePercentage_D3CEEC95BED239C293D016F5230619FD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US"> Debt instrument, redemption price, percentage </link:label>
<link:label id="lab_us-gaap_DebtInstrumentRedemptionPricePercentage_D3CEEC95BED239C293D016F5230619FD_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPricePercentage_D3CEEC95BED239C293D016F5230619FD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US"> Debt Instrument, Redemption Price, Percentage </link:label>
<link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_D3CEEC95BED239C293D016F5230619FD" xlink:type="locator"/>
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