SEC Info - World Fuel Services Corp. - ‘10-K’ for 12/31/20

SEC Info℠

Home

My Interests

Help

Please Sign In

World Fuel Services Corp. – ‘10-K’ for 12/31/20 – ‘EX-101.CAL’

On: Friday, 2/26/21, at 5:41pm ET · As of: 3/1/21 · For: 12/31/20 · Accession #: 1628280-21-3481 · File #: 1-09533

Previous ‘10-K’: ‘10-K’ on 3/2/20 for 12/31/19 · Next: ‘10-K’ on 2/25/22 for 12/31/21 · Latest: ‘10-K’ on 2/23/24 for 12/31/23 · 25 References:

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

 3/01/21  World Fuel Services Corp.         10-K       12/31/20  108:16M                                    Workiva Inc Wde… FA01/FA

Annual Report — Form 10-K
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K        Annual Report                                       HTML   1.69M 
 2: EX-10.24    EX-10.24 - Ssars Agreement                          HTML     74K 
 3: EX-21.1     Subsidiaries List                                   HTML     56K 
 4: EX-23.1     Consent of Expert or Counsel                        HTML     29K 
 5: EX-31.1     Certification -- §302 - SOA'02                      HTML     34K 
 6: EX-31.2     Certification -- §302 - SOA'02                      HTML     34K 
 7: EX-32.1     Certification -- §906 - SOA'02                      HTML     33K 
14: R1          Cover                                               HTML     91K 
15: R2          Consolidated Balance Sheets                         HTML    127K 
16: R3          Consolidated Balance Sheets (Parenthetical)         HTML     47K 
17: R4          Consolidated Statements of Income and               HTML    137K 
                Comprehensive Income                                             
18: R5          Consolidated Statements of Income and               HTML     31K 
                Comprehensive Income (Parenthetical)                             
19: R6          Consolidated Statements of Shareholders' Equity     HTML    111K 
20: R7          Consolidated Statements of Shareholders' Equity     HTML     31K 
                (Parenthetical)                                                  
21: R8          Consolidated Statements of Cash Flows               HTML    137K 
22: R9          Consolidated Statements of Cash Flows               HTML     40K 
                (Parenthetical)                                                  
23: R10         Basis of Presentation, New Accounting Standards     HTML     78K 
                and Significant Accounting Policies                              
24: R11         Accounts Receivable                                 HTML     48K 
25: R12         Acquisitions and Divestitures                       HTML     45K 
26: R13         Derivative Instruments                              HTML    184K 
27: R14         Restructuring                                       HTML     56K 
28: R15         Property and Equipment                              HTML     52K 
29: R16         Goodwill and Identifiable Intangible Assets         HTML     76K 
30: R17         Debt, Interest Income, Expense and Other Finance    HTML     58K 
                Costs                                                            
31: R18         Commitments and Contingencies                       HTML     48K 
32: R19         Shareholders' Equity                                HTML    129K 
33: R20         Income Taxes                                        HTML    156K 
34: R21         Fair Value Measurements                             HTML    142K 
35: R22         Business Segments, Geographic Information and       HTML    121K 
                Major Customers                                                  
36: R23         Revenue from Contracts with Customers               HTML     74K 
37: R24         Leases                                              HTML    129K 
38: R25         Earnings per Common Share                           HTML     47K 
39: R26         Summary Quarterly Information (Unaudited)           HTML     71K 
40: R27         Basis of Presentation, New Accounting Standards     HTML    131K 
                and Significant Accounting Policies (Policies)                   
41: R28         Accounts Receivable (Tables)                        HTML     43K 
42: R29         Acquisitions and Divestitures (Tables)              HTML     40K 
43: R30         Derivative Instruments (Tables)                     HTML    196K 
44: R31         Restructuring (Tables)                              HTML     57K 
45: R32         Property and Equipment (Tables)                     HTML     52K 
46: R33         Goodwill and Identifiable Intangible Assets         HTML    107K 
                (Tables)                                                         
47: R34         Debt, Interest Income, Expense and Other Finance    HTML     57K 
                Costs (Tables)                                                   
48: R35         Commitments and Contingencies (Tables)              HTML     32K 
49: R36         Shareholders' Equity (Tables)                       HTML    130K 
50: R37         Income Taxes (Tables)                               HTML    156K 
51: R38         Fair Value Measurements (Tables)                    HTML    202K 
52: R39         Business Segments, Geographic Information and       HTML    119K 
                Major Customers (Tables)                                         
53: R40         Revenue from Contract with Customer (Tables)        HTML     63K 
54: R41         Leases (Tables)                                     HTML     96K 
55: R42         Earnings per Common Share (Tables)                  HTML     47K 
56: R43         Summary Quarterly Information (Unaudited) (Tables)  HTML     71K 
57: R44         Basis of Presentation, New Accounting Standards     HTML     45K 
                and Significant Accounting Policies (Details)                    
58: R45         Accounts Receivable - Narrative (Details)           HTML     55K 
59: R46         Accounts Receivable - Allowance for Credit Losses   HTML     59K 
                for Accounts Receivable (Details)                                
60: R47         Acquisitions and Divestitures - Narrative           HTML     65K 
                (Details)                                                        
61: R48         Acquisitions and Divestitures - Purchase Price      HTML     57K 
                Allocation (Details)                                             
62: R49         Derivative Instruments - Narrative (Details)        HTML     63K 
63: R50         Derivative Instruments - Balance Sheet Location     HTML     77K 
                (Details)                                                        
64: R51         Derivative Instruments - Gross Notional Values      HTML     41K 
                (Details)                                                        
65: R52         Derivative Instruments - Effect on Income           HTML    141K 
                (Details)                                                        
66: R53         Restructuring - Narrative (Details)                 HTML     38K 
67: R54         Restructuring - Summary of Restructuring            HTML     55K 
                Activities (Details)                                             
68: R55         Restructuring - Summary of Impairment by            HTML     45K 
                Reportable Business Segment (Details)                            
69: R56         Property and Equipment (Details)                    HTML     79K 
70: R57         Goodwill and Identifiable Intangible Assets -       HTML     34K 
                Narrative (Details)                                              
71: R58         Goodwill and Identifiable Intangible Assets -       HTML     46K 
                Goodwill (Details)                                               
72: R59         Goodwill and Identifiable Intangible Assets -       HTML     59K 
                Identifiable Intangible Assets (Details)                         
73: R60         Goodwill and Identifiable Intangible Assets -       HTML     45K 
                Future Estimated Amortization of Identifiable                    
                Intangible Assets (Details)                                      
74: R61         Debt, Interest Income, Expense and Other Finance    HTML     67K 
                Costs - Narrative (Details)                                      
75: R62         Debt, Interest Income, Expense and Other Finance    HTML     52K 
                Costs - Summary of Debt (Details)                                
76: R63         Debt, Interest Income, Expense and Other Finance    HTML     42K 
                Costs - Aggregate Annual Maturities (Details)                    
77: R64         Debt, Interest Income, Expense and Other Finance    HTML     37K 
                Costs - Interest Income, Expense and Other                       
                Financing Costs (Details)                                        
78: R65         Commitments and Contingencies - Bonds, Leases, and  HTML     42K 
                Sales and Purchase Commitments (Details)                         
79: R66         Commitments and Contingencies - Agreements with     HTML     50K 
                Executive Officers and Key Employees (Details)                   
80: R67         Commitments and Contingencies - Deferred            HTML     44K 
                Compensation, Environmental and Other Liabilities                
                (Details)                                                        
81: R68         Commitments and Contingencies - Legal, Tax, and     HTML     42K 
                Other Matters (Details)                                          
82: R69         Shareholders' Equity - Dividends and Stock          HTML     46K 
                Repurchase Programs (Details)                                    
83: R70         Shareholders' Equity - Plan Summary and             HTML     63K 
                Description (Details)                                            
84: R71         Shareholders' Equity - Restricted Stock Awards      HTML     63K 
                (Details)                                                        
85: R72         Shareholders' Equity - RSU Awards and SSAR Awards   HTML    118K 
                (Details)                                                        
86: R73         Shareholders' Equity - Unrecognized Compensation    HTML     46K 
                Cost (Details)                                                   
87: R74         Shareholders' Equity - Other Comprehensive Loss     HTML     57K 
                and Accumulated Other Comprehensive Loss (Details)               
88: R75         Income Taxes - Tax Provision (Benefit),             HTML    116K 
                Reconciliation, and Tax Rates (Details)                          
89: R76         Income Taxes - Narrative (Details)                  HTML    121K 
90: R77         Income Taxes - Temporary Differences (Details)      HTML    100K 
91: R78         Income Taxes - Net Operating Losses and Income Tax  HTML     42K 
                Concessions (Details)                                            
92: R79         Income Taxes - Reconciliation of Unrecognized Tax   HTML     46K 
                Liabilities (Details)                                            
93: R80         Fair Value Measurements - Assets and Liabilities    HTML     89K 
                (Details)                                                        
94: R81         Fair Value Measurements - Commodity and Foreign     HTML     82K 
                Currency Contracts (Details)                                     
95: R82         Business Segments, Geographic Information and       HTML    101K 
                Major Customers - Income Statement Items (Details)               
96: R83         Business Segments, Geographic Information and       HTML     54K 
                Major Customers - Balance Sheet Items (Details)                  
97: R84         Business Segments, Geographic Information and       HTML     64K 
                Major Customers - Geographic Summary (Details)                   
98: R85         Revenue from Contracts with Customers (Details)     HTML     90K 
99: R86         Leases - Lease Cost (Details)                       HTML     48K 
100: R87         Leases - Remaining Lease Payments (Details)         HTML     70K  
101: R88         Leases - Supplemental Balance Sheet Information     HTML     57K  
                (Details)                                                        
102: R89         Leases - Other Information Related to Leases        HTML     56K  
                (Details)                                                        
103: R90         Earnings per Common Share (Details)                 HTML     61K  
104: R91         Summary Quarterly Information (Unaudited)           HTML     70K  
                (Details)                                                        
106: XML         IDEA XML File -- Filing Summary                      XML    200K  
13: XML         XBRL Instance -- int-20201231_htm                    XML   4.55M 
105: EXCEL       IDEA Workbook of Financial Reports                  XLSX    164K  
 9: EX-101.CAL  XBRL Calculations -- int-20201231_cal                XML    408K 
10: EX-101.DEF  XBRL Definitions -- int-20201231_def                 XML    993K 
11: EX-101.LAB  XBRL Labels -- int-20201231_lab                      XML   2.64M 
12: EX-101.PRE  XBRL Presentations -- int-20201231_pre               XML   1.60M 
 8: EX-101.SCH  XBRL Schema -- int-20201231                          XSD    248K 
107: JSON        XBRL Instance as JSON Data -- MetaLinks              582±   875K  
108: ZIP         XBRL Zipped Folder -- 0001628280-21-003481-xbrl      Zip    656K

‘EX-101.CAL’ — XBRL Calculations — int-20201231_cal

This Exhibit is an XBRL XML File.

<?xml version="1.0" encoding="windows-1252"?>

<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">

<link:roleRef roleURI="http://www.wfscorp.com/role/Cover" xlink:type="simple" xlink:href="int-20201231.xsd#Cover"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/Cover" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/ConsolidatedBalanceSheets" xlink:type="simple" xlink:href="int-20201231.xsd#ConsolidatedBalanceSheets"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/ConsolidatedBalanceSheets" xlink:type="extended">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_92b0b0bf-1ac1-4939-bbe6-18b4772a3bc0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_38c93a76-03e5-40ea-a3fc-3aea3a1ba664" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockValue"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_92b0b0bf-1ac1-4939-bbe6-18b4772a3bc0" xlink:to="loc_us-gaap_PreferredStockValue_38c93a76-03e5-40ea-a3fc-3aea3a1ba664" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_d461e89d-9659-439b-a16c-3d17dc2e67ee" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockValue"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_92b0b0bf-1ac1-4939-bbe6-18b4772a3bc0" xlink:to="loc_us-gaap_CommonStockValue_d461e89d-9659-439b-a16c-3d17dc2e67ee" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_5c476407-0198-4d9a-8ad7-6c046b41f220" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock"/>

<link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_92b0b0bf-1ac1-4939-bbe6-18b4772a3bc0" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_5c476407-0198-4d9a-8ad7-6c046b41f220" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_5f83db3a-20fb-4cbb-ad18-ef8dc5eacbce" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>

<link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_92b0b0bf-1ac1-4939-bbe6-18b4772a3bc0" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_5f83db3a-20fb-4cbb-ad18-ef8dc5eacbce" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_edc98cb7-48c4-4a90-9c2b-37041a34a028" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>

<link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_92b0b0bf-1ac1-4939-bbe6-18b4772a3bc0" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_edc98cb7-48c4-4a90-9c2b-37041a34a028" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_a467ab69-f5a1-430f-8edd-a63d82da3742" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Assets"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_5f812577-65b5-4444-a28d-1e1144c58012" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsCurrent"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_a467ab69-f5a1-430f-8edd-a63d82da3742" xlink:to="loc_us-gaap_AssetsCurrent_5f812577-65b5-4444-a28d-1e1144c58012" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_646a1188-c222-41f3-8341-29bcc3ab413f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_a467ab69-f5a1-430f-8edd-a63d82da3742" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_646a1188-c222-41f3-8341-29bcc3ab413f" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_125478a9-4541-4833-82ca-84350f4cd56e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill"/>

<link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_a467ab69-f5a1-430f-8edd-a63d82da3742" xlink:to="loc_us-gaap_Goodwill_125478a9-4541-4833-82ca-84350f4cd56e" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_IntangibleAssetsNetExcludingGoodwillAndOtherAssetsNoncurrent_4ea86985-1aee-44f0-9724-3846f69807c5" xlink:href="int-20201231.xsd#int_IntangibleAssetsNetExcludingGoodwillAndOtherAssetsNoncurrent"/>

<link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_a467ab69-f5a1-430f-8edd-a63d82da3742" xlink:to="loc_int_IntangibleAssetsNetExcludingGoodwillAndOtherAssetsNoncurrent_4ea86985-1aee-44f0-9724-3846f69807c5" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_06709faf-d7a0-42f3-8688-ac6b5853c569" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Liabilities"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_e8c86476-f8b4-4611-85fe-bb4ef0830969" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesCurrent"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_06709faf-d7a0-42f3-8688-ac6b5853c569" xlink:to="loc_us-gaap_LiabilitiesCurrent_e8c86476-f8b4-4611-85fe-bb4ef0830969" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_565403de-7c99-498a-a1c4-c498ff073121" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_06709faf-d7a0-42f3-8688-ac6b5853c569" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_565403de-7c99-498a-a1c4-c498ff073121" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedIncomeTaxesNoncurrent_eca2d282-622e-44e4-b03d-482daae94a7c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedIncomeTaxesNoncurrent"/>

<link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_06709faf-d7a0-42f3-8688-ac6b5853c569" xlink:to="loc_us-gaap_AccruedIncomeTaxesNoncurrent_eca2d282-622e-44e4-b03d-482daae94a7c" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_ec7d092e-adeb-42d6-b14b-d94e77f8a13c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>

<link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_06709faf-d7a0-42f3-8688-ac6b5853c569" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_ec7d092e-adeb-42d6-b14b-d94e77f8a13c" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_c6ce5330-f1aa-4b4f-8540-e0e0a8051e12" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_dc914dfe-6e59-4fed-89ba-5913dcf09710" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Liabilities"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_c6ce5330-f1aa-4b4f-8540-e0e0a8051e12" xlink:to="loc_us-gaap_Liabilities_dc914dfe-6e59-4fed-89ba-5913dcf09710" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_5cccffb7-15b4-4b51-8882-844e01084ee0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommitmentsAndContingencies"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_c6ce5330-f1aa-4b4f-8540-e0e0a8051e12" xlink:to="loc_us-gaap_CommitmentsAndContingencies_5cccffb7-15b4-4b51-8882-844e01084ee0" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_ad43f0f9-40e6-4c44-abe9-e4881d962c02" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>

<link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_c6ce5330-f1aa-4b4f-8540-e0e0a8051e12" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_ad43f0f9-40e6-4c44-abe9-e4881d962c02" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_9ba52ca5-4a72-4877-8aaf-b79fe20a28c6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_c3b2e022-e25b-4b7a-a27e-97dafdd1d2c1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_9ba52ca5-4a72-4877-8aaf-b79fe20a28c6" xlink:to="loc_us-gaap_StockholdersEquity_c3b2e022-e25b-4b7a-a27e-97dafdd1d2c1" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_ffc239b9-b065-412e-8992-4b75f0f312bd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MinorityInterest"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_9ba52ca5-4a72-4877-8aaf-b79fe20a28c6" xlink:to="loc_us-gaap_MinorityInterest_ffc239b9-b065-412e-8992-4b75f0f312bd" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_3df375cd-006f-4605-9ddd-7716e2ea4803" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsCurrent"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_e6c348db-8e63-4778-9106-1c4a3b90f1c1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_3df375cd-006f-4605-9ddd-7716e2ea4803" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_e6c348db-8e63-4778-9106-1c4a3b90f1c1" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_ffb0937c-8ec2-498a-90ff-2f888b518fd4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsReceivableNetCurrent"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_3df375cd-006f-4605-9ddd-7716e2ea4803" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_ffb0937c-8ec2-498a-90ff-2f888b518fd4" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_52da768f-d3b0-4937-86e9-3ab4b10332f4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InventoryNet"/>

<link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_3df375cd-006f-4605-9ddd-7716e2ea4803" xlink:to="loc_us-gaap_InventoryNet_52da768f-d3b0-4937-86e9-3ab4b10332f4" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseCurrent_8d4a6f95-853c-48fe-abce-511e4ab6ba07" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PrepaidExpenseCurrent"/>

<link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_3df375cd-006f-4605-9ddd-7716e2ea4803" xlink:to="loc_us-gaap_PrepaidExpenseCurrent_8d4a6f95-853c-48fe-abce-511e4ab6ba07" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsCurrent_376d9eb7-84a7-494f-a265-8bccf5e767e0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeAssetsCurrent"/>

<link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_3df375cd-006f-4605-9ddd-7716e2ea4803" xlink:to="loc_us-gaap_DerivativeAssetsCurrent_376d9eb7-84a7-494f-a265-8bccf5e767e0" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_c2e9e74e-7fcd-46c0-8416-91ec4cf5015e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsCurrent"/>

<link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_3df375cd-006f-4605-9ddd-7716e2ea4803" xlink:to="loc_us-gaap_OtherAssetsCurrent_c2e9e74e-7fcd-46c0-8416-91ec4cf5015e" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_078dadd4-1dcf-4af4-98ee-12964ada01f7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesCurrent"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_c86b3825-0708-418c-9851-81e7484196e9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_078dadd4-1dcf-4af4-98ee-12964ada01f7" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_c86b3825-0708-418c-9851-81e7484196e9" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_4dee1787-438a-45ae-b7d5-a6a9b50ec69d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsPayableCurrent"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_078dadd4-1dcf-4af4-98ee-12964ada01f7" xlink:to="loc_us-gaap_AccountsPayableCurrent_4dee1787-438a-45ae-b7d5-a6a9b50ec69d" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerRefundLiabilityCurrent_b43163cc-7a5e-408f-b55e-e556cd4e157b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerRefundLiabilityCurrent"/>

<link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_078dadd4-1dcf-4af4-98ee-12964ada01f7" xlink:to="loc_us-gaap_ContractWithCustomerRefundLiabilityCurrent_b43163cc-7a5e-408f-b55e-e556cd4e157b" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_ca279e06-26e0-4de5-8aa4-503842054df6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent"/>

<link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_078dadd4-1dcf-4af4-98ee-12964ada01f7" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_ca279e06-26e0-4de5-8aa4-503842054df6" xlink:type="arc"/>

</link:calculationLink>

<link:roleRef roleURI="http://www.wfscorp.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="simple" xlink:href="int-20201231.xsd#ConsolidatedBalanceSheetsParenthetical"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/ConsolidatedStatementsofIncomeandComprehensiveIncome" xlink:type="simple" xlink:href="int-20201231.xsd#ConsolidatedStatementsofIncomeandComprehensiveIncome"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/ConsolidatedStatementsofIncomeandComprehensiveIncome" xlink:type="extended">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_ee0440b9-085d-40ab-aa6b-ca242d792b35" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_44dbad59-bb34-4102-b1c2-c631424b19bb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_ee0440b9-085d-40ab-aa6b-ca242d792b35" xlink:to="loc_us-gaap_ProfitLoss_44dbad59-bb34-4102-b1c2-c631424b19bb" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_09844b7d-8329-4a0d-8730-852b24a1cd91" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>

<link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_ee0440b9-085d-40ab-aa6b-ca242d792b35" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_09844b7d-8329-4a0d-8730-852b24a1cd91" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_3bd97ff2-5c60-42d7-81b2-f5313f11e235" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NonoperatingIncomeExpense"/>

<link:loc xlink:type="locator" xlink:label="loc_int_InterestIncomeExpenseAndOtherFinancialCostsNet_917c2800-967d-4612-b990-3e768f414b17" xlink:href="int-20201231.xsd#int_InterestIncomeExpenseAndOtherFinancialCostsNet"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_3bd97ff2-5c60-42d7-81b2-f5313f11e235" xlink:to="loc_int_InterestIncomeExpenseAndOtherFinancialCostsNet_917c2800-967d-4612-b990-3e768f414b17" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_3c3484cc-41a7-4a78-8e39-8f5d128dbd85" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_3bd97ff2-5c60-42d7-81b2-f5313f11e235" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_3c3484cc-41a7-4a78-8e39-8f5d128dbd85" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_4c2d9a85-9ad1-4d99-9b13-8b194aae549f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_86113f5f-c4f1-4b35-99de-51b361ac023b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingIncomeLoss"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_4c2d9a85-9ad1-4d99-9b13-8b194aae549f" xlink:to="loc_us-gaap_OperatingIncomeLoss_86113f5f-c4f1-4b35-99de-51b361ac023b" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_ff451b19-8e4f-4834-9945-200e3c0d00c4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NonoperatingIncomeExpense"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_4c2d9a85-9ad1-4d99-9b13-8b194aae549f" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_ff451b19-8e4f-4834-9945-200e3c0d00c4" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_b5f67337-df5b-42d7-ac58-8438744e1e13" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_0a6a7f71-6764-4a97-a788-5523c986ce3a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_b5f67337-df5b-42d7-ac58-8438744e1e13" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_0a6a7f71-6764-4a97-a788-5523c986ce3a" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_00ac3114-d8d9-46a7-8116-9dfb849bb898" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_b5f67337-df5b-42d7-ac58-8438744e1e13" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax_00ac3114-d8d9-46a7-8116-9dfb849bb898" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_fb85ffbd-f371-47ea-8132-73fded511d53" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_a3ade554-f6cf-4085-a2c8-8c0f15c7ba09" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_fb85ffbd-f371-47ea-8132-73fded511d53" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_a3ade554-f6cf-4085-a2c8-8c0f15c7ba09" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_d7edb2cf-509f-4be3-8ee6-6a0b8632d567" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest"/>

<link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_fb85ffbd-f371-47ea-8132-73fded511d53" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_d7edb2cf-509f-4be3-8ee6-6a0b8632d567" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_f6bcc857-1fb5-45cf-b2ba-7ab3781d946d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_dd84ba8c-b9c3-4e98-b23c-09123d94da7d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_f6bcc857-1fb5-45cf-b2ba-7ab3781d946d" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_dd84ba8c-b9c3-4e98-b23c-09123d94da7d" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_7ee3906e-3b0a-4d89-9340-d7fb2f8b9a41" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>

<link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_f6bcc857-1fb5-45cf-b2ba-7ab3781d946d" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_7ee3906e-3b0a-4d89-9340-d7fb2f8b9a41" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_f735ef53-d42f-447a-9cd3-0f0ea373e428" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GrossProfit"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_1b1c0f1c-b438-4518-b619-0ea09d966cec" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Revenues"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_f735ef53-d42f-447a-9cd3-0f0ea373e428" xlink:to="loc_us-gaap_Revenues_1b1c0f1c-b438-4518-b619-0ea09d966cec" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenue_976d7e1b-379e-4b21-bdfa-dc5532027e84" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CostOfRevenue"/>

<link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_f735ef53-d42f-447a-9cd3-0f0ea373e428" xlink:to="loc_us-gaap_CostOfRevenue_976d7e1b-379e-4b21-bdfa-dc5532027e84" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_d80bfac2-39e5-40e7-b876-99981a9859df" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_40599062-d66f-4e94-b7c1-ebadfad27fe2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_d80bfac2-39e5-40e7-b876-99981a9859df" xlink:to="loc_us-gaap_ProfitLoss_40599062-d66f-4e94-b7c1-ebadfad27fe2" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_40a74389-cacf-4bcc-8139-ebd8e1793e37" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_d80bfac2-39e5-40e7-b876-99981a9859df" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_40a74389-cacf-4bcc-8139-ebd8e1793e37" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_df39091b-d6b5-45ae-b315-ca30f48f4067" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingExpenses"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_b690eed0-1b69-4eb7-a297-f26acf43258e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringCharges"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_df39091b-d6b5-45ae-b315-ca30f48f4067" xlink:to="loc_us-gaap_RestructuringCharges_b690eed0-1b69-4eb7-a297-f26acf43258e" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetImpairmentCharges_431aa006-ed56-44f2-a3e9-36a1dcbc5c24" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetImpairmentCharges"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_df39091b-d6b5-45ae-b315-ca30f48f4067" xlink:to="loc_us-gaap_AssetImpairmentCharges_431aa006-ed56-44f2-a3e9-36a1dcbc5c24" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_fac1ca2e-08d1-4f7c-9f0d-ab491bf35863" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense"/>

<link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_df39091b-d6b5-45ae-b315-ca30f48f4067" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_fac1ca2e-08d1-4f7c-9f0d-ab491bf35863" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_dc4cc218-d21b-4bf2-baab-f80e38fab444" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LaborAndRelatedExpense"/>

<link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_df39091b-d6b5-45ae-b315-ca30f48f4067" xlink:to="loc_us-gaap_LaborAndRelatedExpense_dc4cc218-d21b-4bf2-baab-f80e38fab444" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_22ce2c31-cd31-48d7-bb8a-1ccc5cb017aa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingIncomeLoss"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_d971d2b9-a252-426f-b1f6-758a8d84cd0c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GrossProfit"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_22ce2c31-cd31-48d7-bb8a-1ccc5cb017aa" xlink:to="loc_us-gaap_GrossProfit_d971d2b9-a252-426f-b1f6-758a8d84cd0c" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_d38c4c11-cea1-40c3-8c83-f2713f6074e3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingExpenses"/>

<link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_22ce2c31-cd31-48d7-bb8a-1ccc5cb017aa" xlink:to="loc_us-gaap_OperatingExpenses_d38c4c11-cea1-40c3-8c83-f2713f6074e3" xlink:type="arc"/>

</link:calculationLink>

<link:roleRef roleURI="http://www.wfscorp.com/role/ConsolidatedStatementsofIncomeandComprehensiveIncomeParenthetical" xlink:type="simple" xlink:href="int-20201231.xsd#ConsolidatedStatementsofIncomeandComprehensiveIncomeParenthetical"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/ConsolidatedStatementsofIncomeandComprehensiveIncomeParenthetical" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/ConsolidatedStatementsofShareholdersEquity" xlink:type="simple" xlink:href="int-20201231.xsd#ConsolidatedStatementsofShareholdersEquity"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/ConsolidatedStatementsofShareholdersEquity" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/ConsolidatedStatementsofShareholdersEquityParenthetical" xlink:type="simple" xlink:href="int-20201231.xsd#ConsolidatedStatementsofShareholdersEquityParenthetical"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/ConsolidatedStatementsofShareholdersEquityParenthetical" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/ConsolidatedStatementsofCashFlows" xlink:type="simple" xlink:href="int-20201231.xsd#ConsolidatedStatementsofCashFlows"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/ConsolidatedStatementsofCashFlows" xlink:type="extended">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_86327532-1673-4c61-b95a-8e1ae7e692f9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_94bb2002-4673-4634-ae75-9f6083f77068" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DepreciationAndAmortization"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_86327532-1673-4c61-b95a-8e1ae7e692f9" xlink:to="loc_us-gaap_DepreciationAndAmortization_94bb2002-4673-4634-ae75-9f6083f77068" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_657a044b-9365-40f7-93f0-576b44783fa7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_86327532-1673-4c61-b95a-8e1ae7e692f9" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_657a044b-9365-40f7-93f0-576b44783fa7" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_6f100f26-83e8-4e12-a9a5-5362507e1042" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensation"/>

<link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_86327532-1673-4c61-b95a-8e1ae7e692f9" xlink:to="loc_us-gaap_ShareBasedCompensation_6f100f26-83e8-4e12-a9a5-5362507e1042" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_DeferredIncomeTaxExpenseBenefitExcludingValuationAllowanceDeferredTaxAssetChangeInAmount_04805491-9d51-47a3-84ff-3cfb1e1d2c70" xlink:href="int-20201231.xsd#int_DeferredIncomeTaxExpenseBenefitExcludingValuationAllowanceDeferredTaxAssetChangeInAmount"/>

<link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_86327532-1673-4c61-b95a-8e1ae7e692f9" xlink:to="loc_int_DeferredIncomeTaxExpenseBenefitExcludingValuationAllowanceDeferredTaxAssetChangeInAmount_04805491-9d51-47a3-84ff-3cfb1e1d2c70" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_RestructuringChargesWriteDownOfReceivables_86fe9539-e42c-44b5-9086-a4c9b45e5b98" xlink:href="int-20201231.xsd#int_RestructuringChargesWriteDownOfReceivables"/>

<link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_86327532-1673-4c61-b95a-8e1ae7e692f9" xlink:to="loc_int_RestructuringChargesWriteDownOfReceivables_86fe9539-e42c-44b5-9086-a4c9b45e5b98" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossUnrealized_04ade29f-4952-4cd0-aec3-62a19c03906f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignCurrencyTransactionGainLossUnrealized"/>

<link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_86327532-1673-4c61-b95a-8e1ae7e692f9" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossUnrealized_04ade29f-4952-4cd0-aec3-62a19c03906f" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_9179a239-489b-4119-86d0-cf50dddd1f4a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNoncashIncomeExpense"/>

<link:calculationArc order="7" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_86327532-1673-4c61-b95a-8e1ae7e692f9" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_9179a239-489b-4119-86d0-cf50dddd1f4a" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_250105d4-13b1-48ff-b0d4-4d30dfdfccc1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>

<link:calculationArc order="8" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_86327532-1673-4c61-b95a-8e1ae7e692f9" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_250105d4-13b1-48ff-b0d4-4d30dfdfccc1" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_a8c22d83-7b96-4963-9120-ccab7dd82e2b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInInventories"/>

<link:calculationArc order="9" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_86327532-1673-4c61-b95a-8e1ae7e692f9" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_a8c22d83-7b96-4963-9120-ccab7dd82e2b" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidExpense_d1e59e38-9eb7-4801-bab5-00ebca675fbb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidExpense"/>

<link:calculationArc order="10" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_86327532-1673-4c61-b95a-8e1ae7e692f9" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidExpense_d1e59e38-9eb7-4801-bab5-00ebca675fbb" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInDerivativeAssets_c5d9cab5-5b3e-447e-a529-8de3fe651fc0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInDerivativeAssets"/>

<link:calculationArc order="11" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_86327532-1673-4c61-b95a-8e1ae7e692f9" xlink:to="loc_us-gaap_IncreaseDecreaseInDerivativeAssets_c5d9cab5-5b3e-447e-a529-8de3fe651fc0" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherCurrentAssets_5ac7a701-9e53-4339-a4c3-ef8e58faf277" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInOtherCurrentAssets"/>

<link:calculationArc order="12" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_86327532-1673-4c61-b95a-8e1ae7e692f9" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherCurrentAssets_5ac7a701-9e53-4339-a4c3-ef8e58faf277" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseCashCollateralFromCounterparties_0739c4d0-6f23-4632-a3cb-b6c1186d6e54" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseCashCollateralFromCounterparties"/>

<link:calculationArc order="13" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_86327532-1673-4c61-b95a-8e1ae7e692f9" xlink:to="loc_us-gaap_IncreaseDecreaseCashCollateralFromCounterparties_0739c4d0-6f23-4632-a3cb-b6c1186d6e54" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentAssets_ff393971-6ba5-4abe-b88d-4f8b04ead9d9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentAssets"/>

<link:calculationArc order="14" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_86327532-1673-4c61-b95a-8e1ae7e692f9" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentAssets_ff393971-6ba5-4abe-b88d-4f8b04ead9d9" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_57231335-98a7-4aa7-b1bd-e443536686f0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>

<link:calculationArc order="15" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_86327532-1673-4c61-b95a-8e1ae7e692f9" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_57231335-98a7-4aa7-b1bd-e443536686f0" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_IncreaseDecreaseInContractWithCustomerRefundLiability_5ae0e50c-57ee-4841-8b42-0f5d73d3a85f" xlink:href="int-20201231.xsd#int_IncreaseDecreaseInContractWithCustomerRefundLiability"/>

<link:calculationArc order="16" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_86327532-1673-4c61-b95a-8e1ae7e692f9" xlink:to="loc_int_IncreaseDecreaseInContractWithCustomerRefundLiability_5ae0e50c-57ee-4841-8b42-0f5d73d3a85f" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_IncreaseDecreaseInAccruedExpensesAndOtherLiabilities_0d2395e8-aefa-4b51-9f1f-12b803d1ebd3" xlink:href="int-20201231.xsd#int_IncreaseDecreaseInAccruedExpensesAndOtherLiabilities"/>

<link:calculationArc order="17" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_86327532-1673-4c61-b95a-8e1ae7e692f9" xlink:to="loc_int_IncreaseDecreaseInAccruedExpensesAndOtherLiabilities_0d2395e8-aefa-4b51-9f1f-12b803d1ebd3" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_IncreaseDecreaseInIncomeTaxAndOtherLiabilitiesNoncurrent_5342b9af-7be1-42bf-b071-95c847094f83" xlink:href="int-20201231.xsd#int_IncreaseDecreaseInIncomeTaxAndOtherLiabilitiesNoncurrent"/>

<link:calculationArc order="18" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_86327532-1673-4c61-b95a-8e1ae7e692f9" xlink:to="loc_int_IncreaseDecreaseInIncomeTaxAndOtherLiabilitiesNoncurrent_5342b9af-7be1-42bf-b071-95c847094f83" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_95351c0a-2576-4717-bba1-7d38eae38150" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainLossOnSaleOfBusiness"/>

<link:calculationArc order="19" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_86327532-1673-4c61-b95a-8e1ae7e692f9" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_95351c0a-2576-4717-bba1-7d38eae38150" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4c8bba89-9907-4db2-8ad7-1dcec0b6bd01" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfDebt_b45e49fc-cbcd-468c-9836-61f98d908971" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromIssuanceOfDebt"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4c8bba89-9907-4db2-8ad7-1dcec0b6bd01" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfDebt_b45e49fc-cbcd-468c-9836-61f98d908971" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfDebt_4167591f-0162-49bc-9d13-885c1b797022" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RepaymentsOfDebt"/>

<link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4c8bba89-9907-4db2-8ad7-1dcec0b6bd01" xlink:to="loc_us-gaap_RepaymentsOfDebt_4167591f-0162-49bc-9d13-885c1b797022" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_0f03bd2e-5d85-4b74-a7da-868066187c27" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock"/>

<link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4c8bba89-9907-4db2-8ad7-1dcec0b6bd01" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_0f03bd2e-5d85-4b74-a7da-868066187c27" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_788cd8e1-4bc5-40bc-b169-b94842d8012c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>

<link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4c8bba89-9907-4db2-8ad7-1dcec0b6bd01" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_788cd8e1-4bc5-40bc-b169-b94842d8012c" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_086f2671-ea58-4620-8efa-ffb1a52618c5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities"/>

<link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_4c8bba89-9907-4db2-8ad7-1dcec0b6bd01" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_086f2671-ea58-4620-8efa-ffb1a52618c5" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_5e684492-adb1-4c42-90fc-030291ac71df" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_6ae3145c-b407-475c-9a86-5e7bad10ac5c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_5e684492-adb1-4c42-90fc-030291ac71df" xlink:to="loc_us-gaap_ProfitLoss_6ae3145c-b407-475c-9a86-5e7bad10ac5c" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_f36cf1ea-31f0-4af9-afb4-5a3cf79e1b5a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_5e684492-adb1-4c42-90fc-030291ac71df" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities_f36cf1ea-31f0-4af9-afb4-5a3cf79e1b5a" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_cfa2d600-bf35-4531-97fa-0978f2957555" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromCollectionOfRetainedInterestInSecuritizedReceivables_b07d21e7-61b5-4ccc-a663-ade24a1a15bb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromCollectionOfRetainedInterestInSecuritizedReceivables"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_cfa2d600-bf35-4531-97fa-0978f2957555" xlink:to="loc_us-gaap_ProceedsFromCollectionOfRetainedInterestInSecuritizedReceivables_b07d21e7-61b5-4ccc-a663-ade24a1a15bb" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_a06c9428-3e4d-4c0b-86c7-fae442f173df" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>

<link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_cfa2d600-bf35-4531-97fa-0978f2957555" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_a06c9428-3e4d-4c0b-86c7-fae442f173df" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_32c18f99-b120-4aef-b814-4b946f89e427" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>

<link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_cfa2d600-bf35-4531-97fa-0978f2957555" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_32c18f99-b120-4aef-b814-4b946f89e427" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_c00c4d40-9aaa-4f0f-a3c0-ca2a1864cd0e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>

<link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_cfa2d600-bf35-4531-97fa-0978f2957555" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_c00c4d40-9aaa-4f0f-a3c0-ca2a1864cd0e" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_256d5437-dd79-49b3-9ad6-c53ed079870b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses"/>

<link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_cfa2d600-bf35-4531-97fa-0978f2957555" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_256d5437-dd79-49b3-9ad6-c53ed079870b" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_3e1bde25-19f4-4a56-b637-aa4fc94a32e2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_00cdb55a-9acf-4b21-8619-1eafe0aefaec" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_3e1bde25-19f4-4a56-b637-aa4fc94a32e2" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_00cdb55a-9acf-4b21-8619-1eafe0aefaec" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_fbd5c5f4-491e-42ba-981b-1a739860509b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_3e1bde25-19f4-4a56-b637-aa4fc94a32e2" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_fbd5c5f4-491e-42ba-981b-1a739860509b" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_040dd263-756d-4a49-b3f6-33b51a9fbc65" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>

<link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_3e1bde25-19f4-4a56-b637-aa4fc94a32e2" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_040dd263-756d-4a49-b3f6-33b51a9fbc65" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_2639398f-a481-4271-aa03-71dee0893174" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>

<link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_3e1bde25-19f4-4a56-b637-aa4fc94a32e2" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_2639398f-a481-4271-aa03-71dee0893174" xlink:type="arc"/>

</link:calculationLink>

<link:roleRef roleURI="http://www.wfscorp.com/role/ConsolidatedStatementsofCashFlowsParenthetical" xlink:type="simple" xlink:href="int-20201231.xsd#ConsolidatedStatementsofCashFlowsParenthetical"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/ConsolidatedStatementsofCashFlowsParenthetical" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/BasisofPresentationNewAccountingStandardsandSignificantAccountingPolicies" xlink:type="simple" xlink:href="int-20201231.xsd#BasisofPresentationNewAccountingStandardsandSignificantAccountingPolicies"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/BasisofPresentationNewAccountingStandardsandSignificantAccountingPolicies" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/BasisofPresentationNewAccountingStandardsandSignificantAccountingPoliciesPolicies" xlink:type="simple" xlink:href="int-20201231.xsd#BasisofPresentationNewAccountingStandardsandSignificantAccountingPoliciesPolicies"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/BasisofPresentationNewAccountingStandardsandSignificantAccountingPoliciesPolicies" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/BasisofPresentationNewAccountingStandardsandSignificantAccountingPoliciesDetails" xlink:type="simple" xlink:href="int-20201231.xsd#BasisofPresentationNewAccountingStandardsandSignificantAccountingPoliciesDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/BasisofPresentationNewAccountingStandardsandSignificantAccountingPoliciesDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/AccountsReceivable" xlink:type="simple" xlink:href="int-20201231.xsd#AccountsReceivable"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/AccountsReceivable" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/AccountsReceivableTables" xlink:type="simple" xlink:href="int-20201231.xsd#AccountsReceivableTables"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/AccountsReceivableTables" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/AccountsReceivableNarrativeDetails" xlink:type="simple" xlink:href="int-20201231.xsd#AccountsReceivableNarrativeDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/AccountsReceivableNarrativeDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/AccountsReceivableAllowanceforCreditLossesforAccountsReceivableDetails" xlink:type="simple" xlink:href="int-20201231.xsd#AccountsReceivableAllowanceforCreditLossesforAccountsReceivableDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/AccountsReceivableAllowanceforCreditLossesforAccountsReceivableDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/AcquisitionsandDivestitures" xlink:type="simple" xlink:href="int-20201231.xsd#AcquisitionsandDivestitures"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/AcquisitionsandDivestitures" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/AcquisitionsandDivestituresTables" xlink:type="simple" xlink:href="int-20201231.xsd#AcquisitionsandDivestituresTables"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/AcquisitionsandDivestituresTables" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/AcquisitionsandDivestituresNarrativeDetails" xlink:type="simple" xlink:href="int-20201231.xsd#AcquisitionsandDivestituresNarrativeDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/AcquisitionsandDivestituresNarrativeDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/AcquisitionsandDivestituresPurchasePriceAllocationDetails" xlink:type="simple" xlink:href="int-20201231.xsd#AcquisitionsandDivestituresPurchasePriceAllocationDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/AcquisitionsandDivestituresPurchasePriceAllocationDetails" xlink:type="extended">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_b6eff14b-245f-417c-8464-e3fd7beda7e8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_8a3172ee-4bd9-4918-875e-69cf7497c511" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferred1_b6eff14b-245f-417c-8464-e3fd7beda7e8" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_8a3172ee-4bd9-4918-875e-69cf7497c511" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_61027ee6-c0a3-4a56-8441-ce40bd8011db" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferred1_b6eff14b-245f-417c-8464-e3fd7beda7e8" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_61027ee6-c0a3-4a56-8441-ce40bd8011db" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_51caa2da-a84b-4a75-ae8f-91e67ae141cd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_155fd37e-fbe2-49c4-8dbb-c0e561a221d1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable"/>

<link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_51caa2da-a84b-4a75-ae8f-91e67ae141cd" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_155fd37e-fbe2-49c4-8dbb-c0e561a221d1" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesOtherCurrentAndLongTermLiabilities_f04c4483-e721-4cfd-bc1f-073e0a779f94" xlink:href="int-20201231.xsd#int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesOtherCurrentAndLongTermLiabilities"/>

<link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_51caa2da-a84b-4a75-ae8f-91e67ae141cd" xlink:to="loc_int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesOtherCurrentAndLongTermLiabilities_f04c4483-e721-4cfd-bc1f-073e0a779f94" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_0524dad8-1233-4fb6-a9f9-c16393439de4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/>

<link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_51caa2da-a84b-4a75-ae8f-91e67ae141cd" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_0524dad8-1233-4fb6-a9f9-c16393439de4" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsAndGoodwill_a2465447-5d41-4ee3-99c7-e1c4944c0c9f" xlink:href="int-20201231.xsd#int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsAndGoodwill"/>

<link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_51caa2da-a84b-4a75-ae8f-91e67ae141cd" xlink:to="loc_int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsAndGoodwill_a2465447-5d41-4ee3-99c7-e1c4944c0c9f" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherCurrentAndLongTermAssets_b3d40af5-1b27-4e87-9171-361521f0d3db" xlink:href="int-20201231.xsd#int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherCurrentAndLongTermAssets"/>

<link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_51caa2da-a84b-4a75-ae8f-91e67ae141cd" xlink:to="loc_int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherCurrentAndLongTermAssets_b3d40af5-1b27-4e87-9171-361521f0d3db" xlink:type="arc"/>

</link:calculationLink>

<link:roleRef roleURI="http://www.wfscorp.com/role/DerivativeInstruments" xlink:type="simple" xlink:href="int-20201231.xsd#DerivativeInstruments"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/DerivativeInstruments" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/DerivativeInstrumentsTables" xlink:type="simple" xlink:href="int-20201231.xsd#DerivativeInstrumentsTables"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/DerivativeInstrumentsTables" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/DerivativeInstrumentsNarrativeDetails" xlink:type="simple" xlink:href="int-20201231.xsd#DerivativeInstrumentsNarrativeDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/DerivativeInstrumentsNarrativeDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/DerivativeInstrumentsBalanceSheetLocationDetails" xlink:type="simple" xlink:href="int-20201231.xsd#DerivativeInstrumentsBalanceSheetLocationDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/DerivativeInstrumentsBalanceSheetLocationDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/DerivativeInstrumentsGrossNotionalValuesDetails" xlink:type="simple" xlink:href="int-20201231.xsd#DerivativeInstrumentsGrossNotionalValuesDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/DerivativeInstrumentsGrossNotionalValuesDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/DerivativeInstrumentsEffectonIncomeDetails" xlink:type="simple" xlink:href="int-20201231.xsd#DerivativeInstrumentsEffectonIncomeDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/DerivativeInstrumentsEffectonIncomeDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/Restructuring" xlink:type="simple" xlink:href="int-20201231.xsd#Restructuring"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/Restructuring" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/RestructuringTables" xlink:type="simple" xlink:href="int-20201231.xsd#RestructuringTables"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/RestructuringTables" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/RestructuringNarrativeDetails" xlink:type="simple" xlink:href="int-20201231.xsd#RestructuringNarrativeDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/RestructuringNarrativeDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/RestructuringSummaryofRestructuringActivitiesDetails" xlink:type="simple" xlink:href="int-20201231.xsd#RestructuringSummaryofRestructuringActivitiesDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/RestructuringSummaryofRestructuringActivitiesDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/RestructuringSummaryofImpairmentbyReportableBusinessSegmentDetails" xlink:type="simple" xlink:href="int-20201231.xsd#RestructuringSummaryofImpairmentbyReportableBusinessSegmentDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/RestructuringSummaryofImpairmentbyReportableBusinessSegmentDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/PropertyandEquipment" xlink:type="simple" xlink:href="int-20201231.xsd#PropertyandEquipment"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/PropertyandEquipment" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/PropertyandEquipmentTables" xlink:type="simple" xlink:href="int-20201231.xsd#PropertyandEquipmentTables"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/PropertyandEquipmentTables" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/PropertyandEquipmentDetails" xlink:type="simple" xlink:href="int-20201231.xsd#PropertyandEquipmentDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/PropertyandEquipmentDetails" xlink:type="extended">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareNet_227d681e-1521-4a43-a39d-a643ce1489c4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalizedComputerSoftwareNet"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization_b7f1423a-3426-43d5-ab7c-9a9b67c33486" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization"/>

<link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CapitalizedComputerSoftwareNet_227d681e-1521-4a43-a39d-a643ce1489c4" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization_b7f1423a-3426-43d5-ab7c-9a9b67c33486" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareGross_e0b34c19-f430-4aff-9b69-af6e98781245" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalizedComputerSoftwareGross"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CapitalizedComputerSoftwareNet_227d681e-1521-4a43-a39d-a643ce1489c4" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareGross_e0b34c19-f430-4aff-9b69-af6e98781245" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_3560592f-daa8-456c-ade1-2508daecbcee" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_3e0707f1-c621-4b73-a5df-a0c0902388bd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_3560592f-daa8-456c-ade1-2508daecbcee" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_3e0707f1-c621-4b73-a5df-a0c0902388bd" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_23534352-882b-4967-9c68-ac723b044358" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>

<link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_3560592f-daa8-456c-ade1-2508daecbcee" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_23534352-882b-4967-9c68-ac723b044358" xlink:type="arc"/>

</link:calculationLink>

<link:roleRef roleURI="http://www.wfscorp.com/role/GoodwillandIdentifiableIntangibleAssets" xlink:type="simple" xlink:href="int-20201231.xsd#GoodwillandIdentifiableIntangibleAssets"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/GoodwillandIdentifiableIntangibleAssets" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/GoodwillandIdentifiableIntangibleAssetsTables" xlink:type="simple" xlink:href="int-20201231.xsd#GoodwillandIdentifiableIntangibleAssetsTables"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/GoodwillandIdentifiableIntangibleAssetsTables" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/GoodwillandIdentifiableIntangibleAssetsNarrativeDetails" xlink:type="simple" xlink:href="int-20201231.xsd#GoodwillandIdentifiableIntangibleAssetsNarrativeDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/GoodwillandIdentifiableIntangibleAssetsNarrativeDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/GoodwillandIdentifiableIntangibleAssetsGoodwillDetails" xlink:type="simple" xlink:href="int-20201231.xsd#GoodwillandIdentifiableIntangibleAssetsGoodwillDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/GoodwillandIdentifiableIntangibleAssetsGoodwillDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/GoodwillandIdentifiableIntangibleAssetsIdentifiableIntangibleAssetsDetails" xlink:type="simple" xlink:href="int-20201231.xsd#GoodwillandIdentifiableIntangibleAssetsIdentifiableIntangibleAssetsDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/GoodwillandIdentifiableIntangibleAssetsIdentifiableIntangibleAssetsDetails" xlink:type="extended">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_5c004cdc-6d6d-4a38-912c-5e1c06758756" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_0114633d-d3ae-49c1-8d19-01af583806ba" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_5c004cdc-6d6d-4a38-912c-5e1c06758756" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_0114633d-d3ae-49c1-8d19-01af583806ba" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_590578c8-3897-4a70-9596-36b869be23a4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>

<link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_5c004cdc-6d6d-4a38-912c-5e1c06758756" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_590578c8-3897-4a70-9596-36b869be23a4" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_e96c14a7-70d5-4137-b858-2d93123efe9a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_d29ae0ca-e034-4d8f-9828-b3a5535e1148" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_e96c14a7-70d5-4137-b858-2d93123efe9a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_d29ae0ca-e034-4d8f-9828-b3a5535e1148" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_1bbf5028-a011-4a9f-8cb9-c3b7159b3720" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_e96c14a7-70d5-4137-b858-2d93123efe9a" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_1bbf5028-a011-4a9f-8cb9-c3b7159b3720" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_826b72af-137a-4572-a834-b14655791c7d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_9185e8b6-a3b7-435e-b95c-63d1026356d0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>

<link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_826b72af-137a-4572-a834-b14655791c7d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_9185e8b6-a3b7-435e-b95c-63d1026356d0" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_25de4b78-dfad-44af-84ab-2726e4855738" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_826b72af-137a-4572-a834-b14655791c7d" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_25de4b78-dfad-44af-84ab-2726e4855738" xlink:type="arc"/>

</link:calculationLink>

<link:roleRef roleURI="http://www.wfscorp.com/role/GoodwillandIdentifiableIntangibleAssetsIdentifiableIntangibleAssetsDetails_1" xlink:type="simple" xlink:href="int-20201231.xsd#GoodwillandIdentifiableIntangibleAssetsIdentifiableIntangibleAssetsDetails_1"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/GoodwillandIdentifiableIntangibleAssetsIdentifiableIntangibleAssetsDetails_1" xlink:type="extended">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_eef9fce9-421b-42ca-8daa-020e3efc1f51" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_b3018864-4222-491b-a1f1-745af88153e5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_eef9fce9-421b-42ca-8daa-020e3efc1f51" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_b3018864-4222-491b-a1f1-745af88153e5" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_2c97dec4-0d90-4ffe-9481-b9a38d4a86fb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_eef9fce9-421b-42ca-8daa-020e3efc1f51" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_2c97dec4-0d90-4ffe-9481-b9a38d4a86fb" xlink:type="arc"/>

</link:calculationLink>

<link:roleRef roleURI="http://www.wfscorp.com/role/GoodwillandIdentifiableIntangibleAssetsFutureEstimatedAmortizationofIdentifiableIntangibleAssetsDetails" xlink:type="simple" xlink:href="int-20201231.xsd#GoodwillandIdentifiableIntangibleAssetsFutureEstimatedAmortizationofIdentifiableIntangibleAssetsDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/GoodwillandIdentifiableIntangibleAssetsFutureEstimatedAmortizationofIdentifiableIntangibleAssetsDetails" xlink:type="extended">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_8a363467-63b1-489f-956b-91222bb44b18" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_4dcca676-a540-4ac8-8e1f-59cb7479fe56" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_8a363467-63b1-489f-956b-91222bb44b18" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_4dcca676-a540-4ac8-8e1f-59cb7479fe56" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_32a2447b-e893-4acf-9295-4f0dc5e798da" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_8a363467-63b1-489f-956b-91222bb44b18" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_32a2447b-e893-4acf-9295-4f0dc5e798da" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_ebf242ef-e001-42fc-98b6-fd056603fac4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree"/>

<link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_8a363467-63b1-489f-956b-91222bb44b18" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_ebf242ef-e001-42fc-98b6-fd056603fac4" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_d0a23ebd-21ab-48f5-8aa8-d4455b0d95e3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour"/>

<link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_8a363467-63b1-489f-956b-91222bb44b18" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_d0a23ebd-21ab-48f5-8aa8-d4455b0d95e3" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_e13dde70-3598-4528-9908-09b9adbec465" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive"/>

<link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_8a363467-63b1-489f-956b-91222bb44b18" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_e13dde70-3598-4528-9908-09b9adbec465" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_c3835663-6da7-4fd2-a3e5-88481f6e874f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive"/>

<link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_8a363467-63b1-489f-956b-91222bb44b18" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_c3835663-6da7-4fd2-a3e5-88481f6e874f" xlink:type="arc"/>

</link:calculationLink>

<link:roleRef roleURI="http://www.wfscorp.com/role/DebtInterestIncomeExpenseandOtherFinanceCosts" xlink:type="simple" xlink:href="int-20201231.xsd#DebtInterestIncomeExpenseandOtherFinanceCosts"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/DebtInterestIncomeExpenseandOtherFinanceCosts" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/DebtInterestIncomeExpenseandOtherFinanceCostsTables" xlink:type="simple" xlink:href="int-20201231.xsd#DebtInterestIncomeExpenseandOtherFinanceCostsTables"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/DebtInterestIncomeExpenseandOtherFinanceCostsTables" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/DebtInterestIncomeExpenseandOtherFinanceCostsNarrativeDetails" xlink:type="simple" xlink:href="int-20201231.xsd#DebtInterestIncomeExpenseandOtherFinanceCostsNarrativeDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/DebtInterestIncomeExpenseandOtherFinanceCostsNarrativeDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/DebtInterestIncomeExpenseandOtherFinanceCostsSummaryofDebtDetails" xlink:type="simple" xlink:href="int-20201231.xsd#DebtInterestIncomeExpenseandOtherFinanceCostsSummaryofDebtDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/DebtInterestIncomeExpenseandOtherFinanceCostsSummaryofDebtDetails" xlink:type="extended">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_4198d29a-61a4-434b-b1e9-e74b9c027332" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_2417f6e8-5acf-404b-9edb-7c4feddb1d75" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_4198d29a-61a4-434b-b1e9-e74b9c027332" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_2417f6e8-5acf-404b-9edb-7c4feddb1d75" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_0a881b0f-c8c5-419c-ae6e-0ff5c84c9df4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_4198d29a-61a4-434b-b1e9-e74b9c027332" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_0a881b0f-c8c5-419c-ae6e-0ff5c84c9df4" xlink:type="arc"/>

</link:calculationLink>

<link:roleRef roleURI="http://www.wfscorp.com/role/DebtInterestIncomeExpenseandOtherFinanceCostsSummaryofDebtDetails_1" xlink:type="simple" xlink:href="int-20201231.xsd#DebtInterestIncomeExpenseandOtherFinanceCostsSummaryofDebtDetails_1"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/DebtInterestIncomeExpenseandOtherFinanceCostsSummaryofDebtDetails_1" xlink:type="extended">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_67b4be02-0b84-4472-a771-d1326a0ff0e4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_661ddf49-fb0a-4a0f-a9aa-20a66942af35" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiability"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_67b4be02-0b84-4472-a771-d1326a0ff0e4" xlink:to="loc_us-gaap_FinanceLeaseLiability_661ddf49-fb0a-4a0f-a9aa-20a66942af35" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_40426c5a-fde3-4ccd-a382-3e16d16fbb2d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebt"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities_67b4be02-0b84-4472-a771-d1326a0ff0e4" xlink:to="loc_us-gaap_LongTermDebt_40426c5a-fde3-4ccd-a382-3e16d16fbb2d" xlink:type="arc"/>

</link:calculationLink>

<link:roleRef roleURI="http://www.wfscorp.com/role/DebtInterestIncomeExpenseandOtherFinanceCostsAggregateAnnualMaturitiesDetails" xlink:type="simple" xlink:href="int-20201231.xsd#DebtInterestIncomeExpenseandOtherFinanceCostsAggregateAnnualMaturitiesDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/DebtInterestIncomeExpenseandOtherFinanceCostsAggregateAnnualMaturitiesDetails" xlink:type="extended">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndCapitalLeaseObligations_bd856b75-e559-4b7b-a829-8f4fcbf32f5e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtAndCapitalLeaseObligations"/>

<link:loc xlink:type="locator" xlink:label="loc_int_LongTermDebtAndFinanceLeaseLiabilityRepaymentsOfPrincipalInNextTwelveMonths_1d363749-7630-4e19-9f68-1b175e286695" xlink:href="int-20201231.xsd#int_LongTermDebtAndFinanceLeaseLiabilityRepaymentsOfPrincipalInNextTwelveMonths"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtAndCapitalLeaseObligations_bd856b75-e559-4b7b-a829-8f4fcbf32f5e" xlink:to="loc_int_LongTermDebtAndFinanceLeaseLiabilityRepaymentsOfPrincipalInNextTwelveMonths_1d363749-7630-4e19-9f68-1b175e286695" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_LongTermDebtAndFinanceLeaseLiabilityRepaymentsOfPrincipalInYearTwo_90c04831-56a5-48e2-baa3-0d8337602625" xlink:href="int-20201231.xsd#int_LongTermDebtAndFinanceLeaseLiabilityRepaymentsOfPrincipalInYearTwo"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtAndCapitalLeaseObligations_bd856b75-e559-4b7b-a829-8f4fcbf32f5e" xlink:to="loc_int_LongTermDebtAndFinanceLeaseLiabilityRepaymentsOfPrincipalInYearTwo_90c04831-56a5-48e2-baa3-0d8337602625" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_LongTermDebtAndFinanceLeaseLiabilityRepaymentsOfPrincipalInYearThree_72471a70-67da-4bf2-a608-a83038c3c4f7" xlink:href="int-20201231.xsd#int_LongTermDebtAndFinanceLeaseLiabilityRepaymentsOfPrincipalInYearThree"/>

<link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtAndCapitalLeaseObligations_bd856b75-e559-4b7b-a829-8f4fcbf32f5e" xlink:to="loc_int_LongTermDebtAndFinanceLeaseLiabilityRepaymentsOfPrincipalInYearThree_72471a70-67da-4bf2-a608-a83038c3c4f7" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_LongTermDebtAndFinanceLeaseLiabilityRepaymentsOfPrincipalInYearFour_6eb45e8f-34c6-47f0-ba4a-1f19d45e6dea" xlink:href="int-20201231.xsd#int_LongTermDebtAndFinanceLeaseLiabilityRepaymentsOfPrincipalInYearFour"/>

<link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtAndCapitalLeaseObligations_bd856b75-e559-4b7b-a829-8f4fcbf32f5e" xlink:to="loc_int_LongTermDebtAndFinanceLeaseLiabilityRepaymentsOfPrincipalInYearFour_6eb45e8f-34c6-47f0-ba4a-1f19d45e6dea" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_LongTermDebtAndFinanceLeaseLiabilityRepaymentsOfPrincipalInYearFive_a55218c3-e4ca-4c3c-84b8-e9471781f930" xlink:href="int-20201231.xsd#int_LongTermDebtAndFinanceLeaseLiabilityRepaymentsOfPrincipalInYearFive"/>

<link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtAndCapitalLeaseObligations_bd856b75-e559-4b7b-a829-8f4fcbf32f5e" xlink:to="loc_int_LongTermDebtAndFinanceLeaseLiabilityRepaymentsOfPrincipalInYearFive_a55218c3-e4ca-4c3c-84b8-e9471781f930" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_LongTermDebtAndFinanceLeaseLiabilityRepaymentsOfPrincipalAfterYearFive_a2ba5c18-8ced-482f-9062-9b9846e30da0" xlink:href="int-20201231.xsd#int_LongTermDebtAndFinanceLeaseLiabilityRepaymentsOfPrincipalAfterYearFive"/>

<link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtAndCapitalLeaseObligations_bd856b75-e559-4b7b-a829-8f4fcbf32f5e" xlink:to="loc_int_LongTermDebtAndFinanceLeaseLiabilityRepaymentsOfPrincipalAfterYearFive_a2ba5c18-8ced-482f-9062-9b9846e30da0" xlink:type="arc"/>

</link:calculationLink>

<link:roleRef roleURI="http://www.wfscorp.com/role/DebtInterestIncomeExpenseandOtherFinanceCostsInterestIncomeExpenseandOtherFinancingCostsDetails" xlink:type="simple" xlink:href="int-20201231.xsd#DebtInterestIncomeExpenseandOtherFinanceCostsInterestIncomeExpenseandOtherFinancingCostsDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/DebtInterestIncomeExpenseandOtherFinanceCostsInterestIncomeExpenseandOtherFinancingCostsDetails" xlink:type="extended">

<link:loc xlink:type="locator" xlink:label="loc_int_InterestIncomeExpenseAndOtherFinancialCostsNet_320485b6-6a9a-402f-b86a-f799cb80d44f" xlink:href="int-20201231.xsd#int_InterestIncomeExpenseAndOtherFinancialCostsNet"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInterest_adbd25fd-a5a8-4195-95e9-63954d48d9b4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentIncomeInterest"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_int_InterestIncomeExpenseAndOtherFinancialCostsNet_320485b6-6a9a-402f-b86a-f799cb80d44f" xlink:to="loc_us-gaap_InvestmentIncomeInterest_adbd25fd-a5a8-4195-95e9-63954d48d9b4" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_2929257e-3c1a-4a8b-a155-d15e13a24399" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpense"/>

<link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_int_InterestIncomeExpenseAndOtherFinancialCostsNet_320485b6-6a9a-402f-b86a-f799cb80d44f" xlink:to="loc_us-gaap_InterestExpense_2929257e-3c1a-4a8b-a155-d15e13a24399" xlink:type="arc"/>

</link:calculationLink>

<link:roleRef roleURI="http://www.wfscorp.com/role/CommitmentsandContingencies" xlink:type="simple" xlink:href="int-20201231.xsd#CommitmentsandContingencies"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/CommitmentsandContingencies" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/CommitmentsandContingenciesTables" xlink:type="simple" xlink:href="int-20201231.xsd#CommitmentsandContingenciesTables"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/CommitmentsandContingenciesTables" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/CommitmentsandContingenciesBondsLeasesandSalesandPurchaseCommitmentsDetails" xlink:type="simple" xlink:href="int-20201231.xsd#CommitmentsandContingenciesBondsLeasesandSalesandPurchaseCommitmentsDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/CommitmentsandContingenciesBondsLeasesandSalesandPurchaseCommitmentsDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/CommitmentsandContingenciesAgreementswithExecutiveOfficersandKeyEmployeesDetails" xlink:type="simple" xlink:href="int-20201231.xsd#CommitmentsandContingenciesAgreementswithExecutiveOfficersandKeyEmployeesDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/CommitmentsandContingenciesAgreementswithExecutiveOfficersandKeyEmployeesDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/CommitmentsandContingenciesDeferredCompensationEnvironmentalandOtherLiabilitiesDetails" xlink:type="simple" xlink:href="int-20201231.xsd#CommitmentsandContingenciesDeferredCompensationEnvironmentalandOtherLiabilitiesDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/CommitmentsandContingenciesDeferredCompensationEnvironmentalandOtherLiabilitiesDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/CommitmentsandContingenciesLegalTaxandOtherMattersDetails" xlink:type="simple" xlink:href="int-20201231.xsd#CommitmentsandContingenciesLegalTaxandOtherMattersDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/CommitmentsandContingenciesLegalTaxandOtherMattersDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/ShareholdersEquity" xlink:type="simple" xlink:href="int-20201231.xsd#ShareholdersEquity"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/ShareholdersEquity" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/ShareholdersEquityTables" xlink:type="simple" xlink:href="int-20201231.xsd#ShareholdersEquityTables"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/ShareholdersEquityTables" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/ShareholdersEquityDividendsandStockRepurchaseProgramsDetails" xlink:type="simple" xlink:href="int-20201231.xsd#ShareholdersEquityDividendsandStockRepurchaseProgramsDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/ShareholdersEquityDividendsandStockRepurchaseProgramsDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/ShareholdersEquityPlanSummaryandDescriptionDetails" xlink:type="simple" xlink:href="int-20201231.xsd#ShareholdersEquityPlanSummaryandDescriptionDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/ShareholdersEquityPlanSummaryandDescriptionDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/ShareholdersEquityRestrictedStockAwardsDetails" xlink:type="simple" xlink:href="int-20201231.xsd#ShareholdersEquityRestrictedStockAwardsDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/ShareholdersEquityRestrictedStockAwardsDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/ShareholdersEquityRSUAwardsandSSARAwardsDetails" xlink:type="simple" xlink:href="int-20201231.xsd#ShareholdersEquityRSUAwardsandSSARAwardsDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/ShareholdersEquityRSUAwardsandSSARAwardsDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/ShareholdersEquityUnrecognizedCompensationCostDetails" xlink:type="simple" xlink:href="int-20201231.xsd#ShareholdersEquityUnrecognizedCompensationCostDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/ShareholdersEquityUnrecognizedCompensationCostDetails" xlink:type="extended">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_9fc5f450-6fc3-4350-a662-fdc682032894" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>

<link:loc xlink:type="locator" xlink:label="loc_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearOne_aa4e87c5-d1c9-4803-8752-a869417ef655" xlink:href="int-20201231.xsd#int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearOne"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_9fc5f450-6fc3-4350-a662-fdc682032894" xlink:to="loc_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearOne_aa4e87c5-d1c9-4803-8752-a869417ef655" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearTwo_b954d028-d91d-407f-adb8-ee89a9899ff8" xlink:href="int-20201231.xsd#int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearTwo"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_9fc5f450-6fc3-4350-a662-fdc682032894" xlink:to="loc_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearTwo_b954d028-d91d-407f-adb8-ee89a9899ff8" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearThree_ef1b5345-bbc1-4deb-84fd-8b2496437148" xlink:href="int-20201231.xsd#int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearThree"/>

<link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_9fc5f450-6fc3-4350-a662-fdc682032894" xlink:to="loc_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearThree_ef1b5345-bbc1-4deb-84fd-8b2496437148" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearFour_001570f8-59d8-44d8-a4de-9524f9e1a272" xlink:href="int-20201231.xsd#int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearFour"/>

<link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_9fc5f450-6fc3-4350-a662-fdc682032894" xlink:to="loc_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearFour_001570f8-59d8-44d8-a4de-9524f9e1a272" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearFive_5f6bdbfa-bd5e-48d8-8436-f61b4a3ec919" xlink:href="int-20201231.xsd#int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearFive"/>

<link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_9fc5f450-6fc3-4350-a662-fdc682032894" xlink:to="loc_int_EmployeeServiceShareBasedCompensationNonvestedAwardsCompensationCostToBeRecognizedInYearFive_5f6bdbfa-bd5e-48d8-8436-f61b4a3ec919" xlink:type="arc"/>

</link:calculationLink>

<link:roleRef roleURI="http://www.wfscorp.com/role/ShareholdersEquityOtherComprehensiveLossandAccumulatedOtherComprehensiveLossDetails" xlink:type="simple" xlink:href="int-20201231.xsd#ShareholdersEquityOtherComprehensiveLossandAccumulatedOtherComprehensiveLossDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/ShareholdersEquityOtherComprehensiveLossandAccumulatedOtherComprehensiveLossDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/IncomeTaxes" xlink:type="simple" xlink:href="int-20201231.xsd#IncomeTaxes"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/IncomeTaxes" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/IncomeTaxesTables" xlink:type="simple" xlink:href="int-20201231.xsd#IncomeTaxesTables"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/IncomeTaxesTables" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/IncomeTaxesTaxProvisionBenefitReconciliationandTaxRatesDetails" xlink:type="simple" xlink:href="int-20201231.xsd#IncomeTaxesTaxProvisionBenefitReconciliationandTaxRatesDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/IncomeTaxesTaxProvisionBenefitReconciliationandTaxRatesDetails" xlink:type="extended">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_11db7d9c-8a0d-43d5-8f6a-1387cf1d7098" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_f4bf5d53-d7c3-492a-9dce-d556368e9afb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_11db7d9c-8a0d-43d5-8f6a-1387cf1d7098" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_f4bf5d53-d7c3-492a-9dce-d556368e9afb" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_bc4ff85d-5cd9-4630-9060-c6a9b90d77c9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_11db7d9c-8a0d-43d5-8f6a-1387cf1d7098" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_bc4ff85d-5cd9-4630-9060-c6a9b90d77c9" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_b36b455b-a230-4403-90d0-15c08c53dbd3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes"/>

<link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_11db7d9c-8a0d-43d5-8f6a-1387cf1d7098" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_b36b455b-a230-4403-90d0-15c08c53dbd3" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_EffectiveIncomeTaxRateReconciliationDeemedDividendsPercent_ee909e71-5cb3-448e-b89e-2f8f2fb0173d" xlink:href="int-20201231.xsd#int_EffectiveIncomeTaxRateReconciliationDeemedDividendsPercent"/>

<link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_11db7d9c-8a0d-43d5-8f6a-1387cf1d7098" xlink:to="loc_int_EffectiveIncomeTaxRateReconciliationDeemedDividendsPercent_ee909e71-5cb3-448e-b89e-2f8f2fb0173d" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Percent_f6931501-b3bb-4bb6-bc18-0490c5d2dfaf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Percent"/>

<link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_11db7d9c-8a0d-43d5-8f6a-1387cf1d7098" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Percent_f6931501-b3bb-4bb6-bc18-0490c5d2dfaf" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxedIncomePercent_45f7665e-2652-457e-81e8-26d15d28ffcd" xlink:href="int-20201231.xsd#int_EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxedIncomePercent"/>

<link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_11db7d9c-8a0d-43d5-8f6a-1387cf1d7098" xlink:to="loc_int_EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxedIncomePercent_45f7665e-2652-457e-81e8-26d15d28ffcd" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_EffectiveIncomeTaxRateReconciliationBaseErosionAndAntiAbuseTaxPercent_b32ee6fb-cdb3-4bb8-bf53-3f251eb76b8d" xlink:href="int-20201231.xsd#int_EffectiveIncomeTaxRateReconciliationBaseErosionAndAntiAbuseTaxPercent"/>

<link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_11db7d9c-8a0d-43d5-8f6a-1387cf1d7098" xlink:to="loc_int_EffectiveIncomeTaxRateReconciliationBaseErosionAndAntiAbuseTaxPercent_b32ee6fb-cdb3-4bb8-bf53-3f251eb76b8d" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_EffectiveIncomeTaxRateReconciliationDeferredTaxImpactOnForeignUnrepatriatedEarningsPercent_2f0fb0ea-97aa-4726-9713-c98dbcd4b0bb" xlink:href="int-20201231.xsd#int_EffectiveIncomeTaxRateReconciliationDeferredTaxImpactOnForeignUnrepatriatedEarningsPercent"/>

<link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_11db7d9c-8a0d-43d5-8f6a-1387cf1d7098" xlink:to="loc_int_EffectiveIncomeTaxRateReconciliationDeferredTaxImpactOnForeignUnrepatriatedEarningsPercent_2f0fb0ea-97aa-4726-9713-c98dbcd4b0bb" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses_91afeeaf-1d16-4ff4-855b-8897bbc70157" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses"/>

<link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_11db7d9c-8a0d-43d5-8f6a-1387cf1d7098" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses_91afeeaf-1d16-4ff4-855b-8897bbc70157" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies_5f5dd6a7-ee54-469a-8925-829af504371a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies"/>

<link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_11db7d9c-8a0d-43d5-8f6a-1387cf1d7098" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies_5f5dd6a7-ee54-469a-8925-829af504371a" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_EffectiveIncomeTaxRateReconciliationForeignCurrencyAdjustmentsPercent_d41370ca-e5bf-47ce-beda-b42ac07a751a" xlink:href="int-20201231.xsd#int_EffectiveIncomeTaxRateReconciliationForeignCurrencyAdjustmentsPercent"/>

<link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_11db7d9c-8a0d-43d5-8f6a-1387cf1d7098" xlink:to="loc_int_EffectiveIncomeTaxRateReconciliationForeignCurrencyAdjustmentsPercent_d41370ca-e5bf-47ce-beda-b42ac07a751a" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_EffectiveIncomeTaxRateReconciliationIntercompanyPricingAdjustment_e21a4fd7-cef1-4417-a951-039b1ae7b27d" xlink:href="int-20201231.xsd#int_EffectiveIncomeTaxRateReconciliationIntercompanyPricingAdjustment"/>

<link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_11db7d9c-8a0d-43d5-8f6a-1387cf1d7098" xlink:to="loc_int_EffectiveIncomeTaxRateReconciliationIntercompanyPricingAdjustment_e21a4fd7-cef1-4417-a951-039b1ae7b27d" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_EffectiveIncomeTaxRateReconciliationDeductionInterestIncomePercent_8f060052-bffd-4fa3-b432-207cf8b1d915" xlink:href="int-20201231.xsd#int_EffectiveIncomeTaxRateReconciliationDeductionInterestIncomePercent"/>

<link:calculationArc order="13" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_11db7d9c-8a0d-43d5-8f6a-1387cf1d7098" xlink:to="loc_int_EffectiveIncomeTaxRateReconciliationDeductionInterestIncomePercent_8f060052-bffd-4fa3-b432-207cf8b1d915" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseInterestExpensePercent_1ed681fa-1756-4369-af0f-5c602847bef1" xlink:href="int-20201231.xsd#int_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseInterestExpensePercent"/>

<link:calculationArc order="14" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_11db7d9c-8a0d-43d5-8f6a-1387cf1d7098" xlink:to="loc_int_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseInterestExpensePercent_1ed681fa-1756-4369-af0f-5c602847bef1" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_a6f303e8-4167-486f-9207-e4b02ce578fe" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance"/>

<link:calculationArc order="15" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_11db7d9c-8a0d-43d5-8f6a-1387cf1d7098" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_a6f303e8-4167-486f-9207-e4b02ce578fe" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther_485a786a-4209-40a1-9b62-8a59c98912e3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther"/>

<link:calculationArc order="16" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_11db7d9c-8a0d-43d5-8f6a-1387cf1d7098" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther_485a786a-4209-40a1-9b62-8a59c98912e3" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_EffectiveIncomeTaxRateReconciliationSaleOfCompanyPercent_4df4eb92-5c3a-4f94-9376-cdd95c042206" xlink:href="int-20201231.xsd#int_EffectiveIncomeTaxRateReconciliationSaleOfCompanyPercent"/>

<link:calculationArc order="17" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_11db7d9c-8a0d-43d5-8f6a-1387cf1d7098" xlink:to="loc_int_EffectiveIncomeTaxRateReconciliationSaleOfCompanyPercent_4df4eb92-5c3a-4f94-9376-cdd95c042206" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOfficerCompensationPercent_f44eb5d3-033b-4e34-b717-4af02fd54e6b" xlink:href="int-20201231.xsd#int_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOfficerCompensationPercent"/>

<link:calculationArc order="18" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_11db7d9c-8a0d-43d5-8f6a-1387cf1d7098" xlink:to="loc_int_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOfficerCompensationPercent_f44eb5d3-033b-4e34-b717-4af02fd54e6b" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_19e59a73-43f2-499d-bc9e-39c9978184e9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_4702dc5e-646f-487a-9494-af3c52cdedf5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredFederalIncomeTaxExpenseBenefit"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_19e59a73-43f2-499d-bc9e-39c9978184e9" xlink:to="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_4702dc5e-646f-487a-9494-af3c52cdedf5" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_22d2f249-bdd8-4cc4-a6df-7812b024a87c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_19e59a73-43f2-499d-bc9e-39c9978184e9" xlink:to="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_22d2f249-bdd8-4cc4-a6df-7812b024a87c" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_2440ee02-6f4a-409f-a6ff-b2dabbd8024d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredForeignIncomeTaxExpenseBenefit"/>

<link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_19e59a73-43f2-499d-bc9e-39c9978184e9" xlink:to="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_2440ee02-6f4a-409f-a6ff-b2dabbd8024d" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_c829cd41-9eaa-409c-8092-4ab6b2ce187f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_665fc4eb-f4e1-4224-967e-4e02c01e5148" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_c829cd41-9eaa-409c-8092-4ab6b2ce187f" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_665fc4eb-f4e1-4224-967e-4e02c01e5148" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_a23bebfa-3835-4281-be2b-42ccee4c061b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_c829cd41-9eaa-409c-8092-4ab6b2ce187f" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_a23bebfa-3835-4281-be2b-42ccee4c061b" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_6e1d6553-b191-4267-81ed-f8a199d3ad8c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_422e1f8c-15be-4ab9-bf20-45983cb9e849" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_6e1d6553-b191-4267-81ed-f8a199d3ad8c" xlink:to="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_422e1f8c-15be-4ab9-bf20-45983cb9e849" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_5c9a565c-61a2-4fc2-978b-9d2a07cc29c6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_6e1d6553-b191-4267-81ed-f8a199d3ad8c" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_5c9a565c-61a2-4fc2-978b-9d2a07cc29c6" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_NoncurrentIncomeTaxExpenseBenefit_88e3ec16-d28a-4921-b300-b0e4050453b8" xlink:href="int-20201231.xsd#int_NoncurrentIncomeTaxExpenseBenefit"/>

<link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_6e1d6553-b191-4267-81ed-f8a199d3ad8c" xlink:to="loc_int_NoncurrentIncomeTaxExpenseBenefit_88e3ec16-d28a-4921-b300-b0e4050453b8" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_1eb47954-c2a1-4c02-8a2a-108ebd7f0ea4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentFederalTaxExpenseBenefit_9bf3af05-6485-4a16-a0d1-4e2dc44995bb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CurrentFederalTaxExpenseBenefit"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_1eb47954-c2a1-4c02-8a2a-108ebd7f0ea4" xlink:to="loc_us-gaap_CurrentFederalTaxExpenseBenefit_9bf3af05-6485-4a16-a0d1-4e2dc44995bb" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_3fc1eefa-568b-49b7-9a0f-641185e02714" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CurrentStateAndLocalTaxExpenseBenefit"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_1eb47954-c2a1-4c02-8a2a-108ebd7f0ea4" xlink:to="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_3fc1eefa-568b-49b7-9a0f-641185e02714" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentForeignTaxExpenseBenefit_bbc74aa6-5803-4bce-be82-7bb0d5d02f47" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CurrentForeignTaxExpenseBenefit"/>

<link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_1eb47954-c2a1-4c02-8a2a-108ebd7f0ea4" xlink:to="loc_us-gaap_CurrentForeignTaxExpenseBenefit_bbc74aa6-5803-4bce-be82-7bb0d5d02f47" xlink:type="arc"/>

</link:calculationLink>

<link:roleRef roleURI="http://www.wfscorp.com/role/IncomeTaxesNarrativeDetails" xlink:type="simple" xlink:href="int-20201231.xsd#IncomeTaxesNarrativeDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/IncomeTaxesTemporaryDifferencesDetails" xlink:type="simple" xlink:href="int-20201231.xsd#IncomeTaxesTemporaryDifferencesDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/IncomeTaxesTemporaryDifferencesDetails" xlink:type="extended">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsNet_715ee7f1-6303-4453-b2d8-fda0aded295e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsNet"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_4fa020be-9e01-4aba-bca1-ea0a8a118712" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/>

<link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsNet_715ee7f1-6303-4453-b2d8-fda0aded295e" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_4fa020be-9e01-4aba-bca1-ea0a8a118712" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsGross_7e600b94-23a6-489e-9cd8-596fce370329" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsGross"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsNet_715ee7f1-6303-4453-b2d8-fda0aded295e" xlink:to="loc_us-gaap_DeferredTaxAssetsGross_7e600b94-23a6-489e-9cd8-596fce370329" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilities_35df15ba-9550-4b7e-8744-9765b6fff20c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilities"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_eff58a24-0e74-482b-9787-0a39a63fded1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_35df15ba-9550-4b7e-8744-9765b6fff20c" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_eff58a24-0e74-482b-9787-0a39a63fded1" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets_99dfcf3c-1276-4e5b-bd57-a188c203cf84" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_35df15ba-9550-4b7e-8744-9765b6fff20c" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets_99dfcf3c-1276-4e5b-bd57-a188c203cf84" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains_408916af-79f8-4099-9777-195ab3440832" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains"/>

<link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_35df15ba-9550-4b7e-8744-9765b6fff20c" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains_408916af-79f8-4099-9777-195ab3440832" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesPrepaidExpenses_576d5c72-f2f9-45ed-9798-f33f44fae792" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesPrepaidExpenses"/>

<link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_35df15ba-9550-4b7e-8744-9765b6fff20c" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesPrepaidExpenses_576d5c72-f2f9-45ed-9798-f33f44fae792" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings_5494efcf-d932-48bd-b2d9-26b5700e6ee7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings"/>

<link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_35df15ba-9550-4b7e-8744-9765b6fff20c" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings_5494efcf-d932-48bd-b2d9-26b5700e6ee7" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesDerivatives_8d96aecc-6483-4d41-9da9-f512e07e7bdd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesDerivatives"/>

<link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_35df15ba-9550-4b7e-8744-9765b6fff20c" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesDerivatives_8d96aecc-6483-4d41-9da9-f512e07e7bdd" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesOther_4eca8124-cd8d-41ec-9db9-d107b4a270a9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesOther"/>

<link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_35df15ba-9550-4b7e-8744-9765b6fff20c" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesOther_4eca8124-cd8d-41ec-9db9-d107b4a270a9" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilities_b7d938c9-cbc9-4676-b97e-88c8673d42df" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilities"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsNet_3864fcc3-fd33-494d-8847-2f8da7bea0ed" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsNet"/>

<link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxLiabilities_b7d938c9-cbc9-4676-b97e-88c8673d42df" xlink:to="loc_us-gaap_DeferredTaxAssetsNet_3864fcc3-fd33-494d-8847-2f8da7bea0ed" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilities_705a5057-34bd-4d0e-8f58-e759f99913e1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilities"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxLiabilities_b7d938c9-cbc9-4676-b97e-88c8673d42df" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilities_705a5057-34bd-4d0e-8f58-e759f99913e1" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsGross_7378c954-e4d1-4c08-ae5f-8d2afd96018b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsGross"/>

<link:loc xlink:type="locator" xlink:label="loc_int_DeferredTaxAssetsInterestLimitation_df0d309b-da88-4f76-8e31-6cfe6a131efb" xlink:href="int-20201231.xsd#int_DeferredTaxAssetsInterestLimitation"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_7378c954-e4d1-4c08-ae5f-8d2afd96018b" xlink:to="loc_int_DeferredTaxAssetsInterestLimitation_df0d309b-da88-4f76-8e31-6cfe6a131efb" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOther_a349f2a0-3659-4a75-8533-241281691c3d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsOther"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_7378c954-e4d1-4c08-ae5f-8d2afd96018b" xlink:to="loc_us-gaap_DeferredTaxAssetsOther_a349f2a0-3659-4a75-8533-241281691c3d" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_DeferredTaxAssetsInstallmentSale_2e9fe323-c021-4191-b098-7abce644b182" xlink:href="int-20201231.xsd#int_DeferredTaxAssetsInstallmentSale"/>

<link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_7378c954-e4d1-4c08-ae5f-8d2afd96018b" xlink:to="loc_int_DeferredTaxAssetsInstallmentSale_2e9fe323-c021-4191-b098-7abce644b182" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_DeferredTaxAssetsCustomerDeposits_470745bb-704b-475a-a3a0-0716c81f4452" xlink:href="int-20201231.xsd#int_DeferredTaxAssetsCustomerDeposits"/>

<link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_7378c954-e4d1-4c08-ae5f-8d2afd96018b" xlink:to="loc_int_DeferredTaxAssetsCustomerDeposits_470745bb-704b-475a-a3a0-0716c81f4452" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation_94e235cf-7453-4859-a378-44a3030b5c86" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation"/>

<link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_7378c954-e4d1-4c08-ae5f-8d2afd96018b" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation_94e235cf-7453-4859-a378-44a3030b5c86" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsHedgingTransactions_44952c63-ffaf-40e7-b51f-0638cb5b51fd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsHedgingTransactions"/>

<link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_7378c954-e4d1-4c08-ae5f-8d2afd96018b" xlink:to="loc_us-gaap_DeferredTaxAssetsHedgingTransactions_44952c63-ffaf-40e7-b51f-0638cb5b51fd" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign_437f30e0-ca58-49fb-bd7b-4781ef9a0867" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign"/>

<link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_7378c954-e4d1-4c08-ae5f-8d2afd96018b" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign_437f30e0-ca58-49fb-bd7b-4781ef9a0867" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther_1db67e8c-047b-4a18-8563-923658dd0250" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther"/>

<link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_7378c954-e4d1-4c08-ae5f-8d2afd96018b" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther_1db67e8c-047b-4a18-8563-923658dd0250" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts_b9016256-a59f-4810-8e91-a0122b397f89" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts"/>

<link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_7378c954-e4d1-4c08-ae5f-8d2afd96018b" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts_b9016256-a59f-4810-8e91-a0122b397f89" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_c5a74e7c-9216-4b70-8325-8601e43e45c5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwards"/>

<link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_7378c954-e4d1-4c08-ae5f-8d2afd96018b" xlink:to="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_c5a74e7c-9216-4b70-8325-8601e43e45c5" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_int_DeferredTaxAssetsLeases_a65b304a-8714-43af-be39-bbb74b98997b" xlink:href="int-20201231.xsd#int_DeferredTaxAssetsLeases"/>

<link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_7378c954-e4d1-4c08-ae5f-8d2afd96018b" xlink:to="loc_int_DeferredTaxAssetsLeases_a65b304a-8714-43af-be39-bbb74b98997b" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities_7ca4156c-cb1e-40ba-bc5e-885bc35e3d72" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities"/>

<link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_7378c954-e4d1-4c08-ae5f-8d2afd96018b" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities_7ca4156c-cb1e-40ba-bc5e-885bc35e3d72" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses_966c63c3-fd30-433e-a042-a171893b51c9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses"/>

<link:calculationArc order="13" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_7378c954-e4d1-4c08-ae5f-8d2afd96018b" xlink:to="loc_us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses_966c63c3-fd30-433e-a042-a171893b51c9" xlink:type="arc"/>

</link:calculationLink>

<link:roleRef roleURI="http://www.wfscorp.com/role/IncomeTaxesNetOperatingLossesandIncomeTaxConcessionsDetails" xlink:type="simple" xlink:href="int-20201231.xsd#IncomeTaxesNetOperatingLossesandIncomeTaxConcessionsDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/IncomeTaxesNetOperatingLossesandIncomeTaxConcessionsDetails" xlink:type="extended">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_f0df146d-5625-424a-b5d1-9fcf22af18bd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwards"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign_6142e352-83d5-44a7-b988-47074859fb6d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_f0df146d-5625-424a-b5d1-9fcf22af18bd" xlink:to="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign_6142e352-83d5-44a7-b988-47074859fb6d" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic_a6ba680e-5e8b-475c-982b-23920813ee45" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_f0df146d-5625-424a-b5d1-9fcf22af18bd" xlink:to="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic_a6ba680e-5e8b-475c-982b-23920813ee45" xlink:type="arc"/>

</link:calculationLink>

<link:roleRef roleURI="http://www.wfscorp.com/role/IncomeTaxesReconciliationofUnrecognizedTaxLiabilitiesDetails" xlink:type="simple" xlink:href="int-20201231.xsd#IncomeTaxesReconciliationofUnrecognizedTaxLiabilitiesDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/IncomeTaxesReconciliationofUnrecognizedTaxLiabilitiesDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/FairValueMeasurements" xlink:type="simple" xlink:href="int-20201231.xsd#FairValueMeasurements"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/FairValueMeasurements" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/FairValueMeasurementsTables" xlink:type="simple" xlink:href="int-20201231.xsd#FairValueMeasurementsTables"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/FairValueMeasurementsTables" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/FairValueMeasurementsAssetsandLiabilitiesDetails" xlink:type="simple" xlink:href="int-20201231.xsd#FairValueMeasurementsAssetsandLiabilitiesDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/FairValueMeasurementsAssetsandLiabilitiesDetails" xlink:type="extended">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_9a72e802-0a56-4a8b-81ed-54c4a4e0b64f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_26559f62-ddff-473f-8212-a9708d9e7cf4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosure_9a72e802-0a56-4a8b-81ed-54c4a4e0b64f" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_26559f62-ddff-473f-8212-a9708d9e7cf4" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_374a6842-2ae4-4d79-8daa-7861c8f50854" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsFairValueDisclosure"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_397b6ad1-3ae4-4c91-8517-09281ad5ab25" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_374a6842-2ae4-4d79-8daa-7861c8f50854" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_397b6ad1-3ae4-4c91-8517-09281ad5ab25" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsFairValueDisclosure_ba36d34c-c4b0-47e2-8c83-f7e9bf99ba51" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentsFairValueDisclosure"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_374a6842-2ae4-4d79-8daa-7861c8f50854" xlink:to="loc_us-gaap_InvestmentsFairValueDisclosure_ba36d34c-c4b0-47e2-8c83-f7e9bf99ba51" xlink:type="arc"/>

</link:calculationLink>

<link:roleRef roleURI="http://www.wfscorp.com/role/FairValueMeasurementsCommodityandForeignCurrencyContractsDetails" xlink:type="simple" xlink:href="int-20201231.xsd#FairValueMeasurementsCommodityandForeignCurrencyContractsDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/FairValueMeasurementsCommodityandForeignCurrencyContractsDetails" xlink:type="extended">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_e45686a5-a20f-44f2-93c2-553e02dc610d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_a3529f3d-e242-4f94-8547-a78ec927423b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeLiabilities"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_e45686a5-a20f-44f2-93c2-553e02dc610d" xlink:to="loc_us-gaap_DerivativeLiabilities_a3529f3d-e242-4f94-8547-a78ec927423b" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeCollateralRightToReclaimCash_1511d7b9-cf8a-48f9-890c-1a0a7957d254" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeCollateralRightToReclaimCash"/>

<link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_e45686a5-a20f-44f2-93c2-553e02dc610d" xlink:to="loc_us-gaap_DerivativeCollateralRightToReclaimCash_1511d7b9-cf8a-48f9-890c-1a0a7957d254" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangementDeduction_afb0285b-5149-405b-ac88-775b8e2ab08a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangementDeduction"/>

<link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_e45686a5-a20f-44f2-93c2-553e02dc610d" xlink:to="loc_us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangementDeduction_afb0285b-5149-405b-ac88-775b8e2ab08a" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_72e69338-319d-4560-89b0-c452df3ebe5e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeAssets"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_06f362d2-8ad7-4a61-9277-789cfe89f5c5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssets_72e69338-319d-4560-89b0-c452df3ebe5e" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_06f362d2-8ad7-4a61-9277-789cfe89f5c5" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetFairValueGrossLiability_b61c9c41-3cb1-4092-b53e-371bcc4ac950" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeAssetFairValueGrossLiability"/>

<link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssets_72e69338-319d-4560-89b0-c452df3ebe5e" xlink:to="loc_us-gaap_DerivativeAssetFairValueGrossLiability_b61c9c41-3cb1-4092-b53e-371bcc4ac950" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_fcd0d1a4-3533-4f95-a1ed-f3f97c5341df" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeLiabilities"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_b3536258-fe3a-4fbb-b81b-a3836b057acf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilities_fcd0d1a4-3533-4f95-a1ed-f3f97c5341df" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_b3536258-fe3a-4fbb-b81b-a3836b057acf" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_581ece2b-ba97-4f16-b48f-35c2ab1dba66" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeLiabilityFairValueGrossAsset"/>

<link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeLiabilities_fcd0d1a4-3533-4f95-a1ed-f3f97c5341df" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_581ece2b-ba97-4f16-b48f-35c2ab1dba66" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_d76ad435-6e62-442a-b401-285fb30dc542" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_50bb5f2e-210c-4ba6-b7bd-8b7d91be2811" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeAssets"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_d76ad435-6e62-442a-b401-285fb30dc542" xlink:to="loc_us-gaap_DerivativeAssets_50bb5f2e-210c-4ba6-b7bd-8b7d91be2811" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeCollateralObligationToReturnCash_7814483b-1864-46e6-b6e8-39912dbaca3f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeCollateralObligationToReturnCash"/>

<link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_d76ad435-6e62-442a-b401-285fb30dc542" xlink:to="loc_us-gaap_DerivativeCollateralObligationToReturnCash_7814483b-1864-46e6-b6e8-39912dbaca3f" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangementDeduction_e3428a17-6c48-4511-bd0e-1836d6a1bc57" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangementDeduction"/>

<link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection_d76ad435-6e62-442a-b401-285fb30dc542" xlink:to="loc_us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangementDeduction_e3428a17-6c48-4511-bd0e-1836d6a1bc57" xlink:type="arc"/>

</link:calculationLink>

<link:roleRef roleURI="http://www.wfscorp.com/role/BusinessSegmentsGeographicInformationandMajorCustomers" xlink:type="simple" xlink:href="int-20201231.xsd#BusinessSegmentsGeographicInformationandMajorCustomers"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/BusinessSegmentsGeographicInformationandMajorCustomers" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/BusinessSegmentsGeographicInformationandMajorCustomersTables" xlink:type="simple" xlink:href="int-20201231.xsd#BusinessSegmentsGeographicInformationandMajorCustomersTables"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/BusinessSegmentsGeographicInformationandMajorCustomersTables" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/BusinessSegmentsGeographicInformationandMajorCustomersIncomeStatementItemsDetails" xlink:type="simple" xlink:href="int-20201231.xsd#BusinessSegmentsGeographicInformationandMajorCustomersIncomeStatementItemsDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/BusinessSegmentsGeographicInformationandMajorCustomersIncomeStatementItemsDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/BusinessSegmentsGeographicInformationandMajorCustomersBalanceSheetItemsDetails" xlink:type="simple" xlink:href="int-20201231.xsd#BusinessSegmentsGeographicInformationandMajorCustomersBalanceSheetItemsDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/BusinessSegmentsGeographicInformationandMajorCustomersBalanceSheetItemsDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/BusinessSegmentsGeographicInformationandMajorCustomersGeographicSummaryDetails" xlink:type="simple" xlink:href="int-20201231.xsd#BusinessSegmentsGeographicInformationandMajorCustomersGeographicSummaryDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/BusinessSegmentsGeographicInformationandMajorCustomersGeographicSummaryDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/RevenuefromContractswithCustomers" xlink:type="simple" xlink:href="int-20201231.xsd#RevenuefromContractswithCustomers"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/RevenuefromContractswithCustomers" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/RevenuefromContractwithCustomerTables" xlink:type="simple" xlink:href="int-20201231.xsd#RevenuefromContractwithCustomerTables"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/RevenuefromContractwithCustomerTables" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/RevenuefromContractswithCustomersDetails" xlink:type="simple" xlink:href="int-20201231.xsd#RevenuefromContractswithCustomersDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/RevenuefromContractswithCustomersDetails" xlink:type="extended">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_be8ade94-0c9f-484e-967f-4a3be6f5277b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Revenues"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_17cf053b-961e-4f47-af97-63809ab53ce6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_be8ade94-0c9f-484e-967f-4a3be6f5277b" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_17cf053b-961e-4f47-af97-63809ab53ce6" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueNotFromContractWithCustomer_ed1c0de6-0cfa-4c94-907e-9f9951e311ca" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueNotFromContractWithCustomer"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_be8ade94-0c9f-484e-967f-4a3be6f5277b" xlink:to="loc_us-gaap_RevenueNotFromContractWithCustomer_ed1c0de6-0cfa-4c94-907e-9f9951e311ca" xlink:type="arc"/>

</link:calculationLink>

<link:roleRef roleURI="http://www.wfscorp.com/role/Leases" xlink:type="simple" xlink:href="int-20201231.xsd#Leases"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/Leases" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/LeasesTables" xlink:type="simple" xlink:href="int-20201231.xsd#LeasesTables"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/LeasesTables" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/LeasesLeaseCostDetails" xlink:type="simple" xlink:href="int-20201231.xsd#LeasesLeaseCostDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/LeasesLeaseCostDetails" xlink:type="extended">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseCost_1b30984f-d6f8-4f70-818e-77f3210111a0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseCost"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetAmortization_961f4cf4-3bec-4cd8-91b8-5a445b705797" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAssetAmortization"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_1b30984f-d6f8-4f70-818e-77f3210111a0" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetAmortization_961f4cf4-3bec-4cd8-91b8-5a445b705797" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseInterestExpense_73ad913c-c651-4a53-9a16-e8c52c525e4d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseInterestExpense"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_1b30984f-d6f8-4f70-818e-77f3210111a0" xlink:to="loc_us-gaap_FinanceLeaseInterestExpense_73ad913c-c651-4a53-9a16-e8c52c525e4d" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_8dc1974f-4210-4feb-8b1c-89fa5f7899af" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseCost"/>

<link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_1b30984f-d6f8-4f70-818e-77f3210111a0" xlink:to="loc_us-gaap_OperatingLeaseCost_8dc1974f-4210-4feb-8b1c-89fa5f7899af" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermLeaseCost_8b6b9b80-070a-4863-8aa4-4cf0feb0eb7e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermLeaseCost"/>

<link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_1b30984f-d6f8-4f70-818e-77f3210111a0" xlink:to="loc_us-gaap_ShortTermLeaseCost_8b6b9b80-070a-4863-8aa4-4cf0feb0eb7e" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeaseCost_21cda518-e1e7-4f10-822f-51115c9ce51e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_VariableLeaseCost"/>

<link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_1b30984f-d6f8-4f70-818e-77f3210111a0" xlink:to="loc_us-gaap_VariableLeaseCost_21cda518-e1e7-4f10-822f-51115c9ce51e" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubleaseIncome_92bc799b-b290-481d-bb13-bb011697b6c5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubleaseIncome"/>

<link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_1b30984f-d6f8-4f70-818e-77f3210111a0" xlink:to="loc_us-gaap_SubleaseIncome_92bc799b-b290-481d-bb13-bb011697b6c5" xlink:type="arc"/>

</link:calculationLink>

<link:roleRef roleURI="http://www.wfscorp.com/role/LeasesRemainingLeasePaymentsDetails" xlink:type="simple" xlink:href="int-20201231.xsd#LeasesRemainingLeasePaymentsDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/LeasesRemainingLeasePaymentsDetails" xlink:type="extended">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_cee019dd-5546-49a6-9991-706baedc1bda" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_4f7d6992-c67b-47d9-8d0e-037ddae67bea" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_cee019dd-5546-49a6-9991-706baedc1bda" xlink:to="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_4f7d6992-c67b-47d9-8d0e-037ddae67bea" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_360b58f4-78bb-48f7-9241-cc8b3de37de8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiability"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_cee019dd-5546-49a6-9991-706baedc1bda" xlink:to="loc_us-gaap_FinanceLeaseLiability_360b58f4-78bb-48f7-9241-cc8b3de37de8" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_36ef845f-eb7f-4d8d-b62e-a027cf7d4fcc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_57c72228-f288-4f74-84e9-afb3a384ec43" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_36ef845f-eb7f-4d8d-b62e-a027cf7d4fcc" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_57c72228-f288-4f74-84e9-afb3a384ec43" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_17c1ffc3-1932-400c-ae61-ce422ccd0760" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiability"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_36ef845f-eb7f-4d8d-b62e-a027cf7d4fcc" xlink:to="loc_us-gaap_OperatingLeaseLiability_17c1ffc3-1932-400c-ae61-ce422ccd0760" xlink:type="arc"/>

</link:calculationLink>

<link:roleRef roleURI="http://www.wfscorp.com/role/LeasesRemainingLeasePaymentsDetails_1" xlink:type="simple" xlink:href="int-20201231.xsd#LeasesRemainingLeasePaymentsDetails_1"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/LeasesRemainingLeasePaymentsDetails_1" xlink:type="extended">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_62b5b89b-02ea-4b70-a864-b50555852cb4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_5c178239-baf2-4f60-b457-a5ba6ca0292e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_62b5b89b-02ea-4b70-a864-b50555852cb4" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_5c178239-baf2-4f60-b457-a5ba6ca0292e" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_af72522a-ae51-43d8-b93a-40bd50a4b48b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_62b5b89b-02ea-4b70-a864-b50555852cb4" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_af72522a-ae51-43d8-b93a-40bd50a4b48b" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_6514fdbc-91c6-42ed-9768-be0aba74e039" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree"/>

<link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_62b5b89b-02ea-4b70-a864-b50555852cb4" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_6514fdbc-91c6-42ed-9768-be0aba74e039" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_80df05d7-3ad4-4757-a79c-13f9f28c1314" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour"/>

<link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_62b5b89b-02ea-4b70-a864-b50555852cb4" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_80df05d7-3ad4-4757-a79c-13f9f28c1314" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_89e76ed4-5068-4a0a-b433-185a5658d492" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive"/>

<link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_62b5b89b-02ea-4b70-a864-b50555852cb4" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_89e76ed4-5068-4a0a-b433-185a5658d492" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_100a3e71-5592-4def-9397-d89c6690a2c1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive"/>

<link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_62b5b89b-02ea-4b70-a864-b50555852cb4" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_100a3e71-5592-4def-9397-d89c6690a2c1" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_0588f65e-2e98-4054-8f23-5e5a20e2eeec" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_9b92ef41-a03f-4586-b7a1-8024ad682d52" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_0588f65e-2e98-4054-8f23-5e5a20e2eeec" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_9b92ef41-a03f-4586-b7a1-8024ad682d52" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_25cd03bd-edde-4260-a08f-285b8f03ce38" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_0588f65e-2e98-4054-8f23-5e5a20e2eeec" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_25cd03bd-edde-4260-a08f-285b8f03ce38" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_e1b5b013-2e00-4e1c-a013-7a182e036cc3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/>

<link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_0588f65e-2e98-4054-8f23-5e5a20e2eeec" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_e1b5b013-2e00-4e1c-a013-7a182e036cc3" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_792c383c-f625-4ee4-9df8-eb2ab49ab1a6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour"/>

<link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_0588f65e-2e98-4054-8f23-5e5a20e2eeec" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_792c383c-f625-4ee4-9df8-eb2ab49ab1a6" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_464c4a4f-df1a-4dd4-be7c-03d849645108" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive"/>

<link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_0588f65e-2e98-4054-8f23-5e5a20e2eeec" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_464c4a4f-df1a-4dd4-be7c-03d849645108" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_71ff14c0-4c7e-4ecb-899e-dba25d166640" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive"/>

<link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_0588f65e-2e98-4054-8f23-5e5a20e2eeec" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_71ff14c0-4c7e-4ecb-899e-dba25d166640" xlink:type="arc"/>

</link:calculationLink>

<link:roleRef roleURI="http://www.wfscorp.com/role/LeasesSupplementalBalanceSheetInformationDetails" xlink:type="simple" xlink:href="int-20201231.xsd#LeasesSupplementalBalanceSheetInformationDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/LeasesSupplementalBalanceSheetInformationDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/LeasesOtherInformationRelatedtoLeasesDetails" xlink:type="simple" xlink:href="int-20201231.xsd#LeasesOtherInformationRelatedtoLeasesDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/LeasesOtherInformationRelatedtoLeasesDetails" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/EarningsperCommonShare" xlink:type="simple" xlink:href="int-20201231.xsd#EarningsperCommonShare"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/EarningsperCommonShare" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/EarningsperCommonShareTables" xlink:type="simple" xlink:href="int-20201231.xsd#EarningsperCommonShareTables"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/EarningsperCommonShareTables" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/EarningsperCommonShareDetails" xlink:type="simple" xlink:href="int-20201231.xsd#EarningsperCommonShareDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/EarningsperCommonShareDetails" xlink:type="extended">

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_415e1d55-3152-4d57-acbf-b612e195726c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_a253c8c0-4d67-48ae-b7f2-b5eac2639a98" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>

<link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_415e1d55-3152-4d57-acbf-b612e195726c" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_a253c8c0-4d67-48ae-b7f2-b5eac2639a98" xlink:type="arc"/>

<link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_5ebedf11-ee64-4388-b527-576909f37d2f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment"/>

<link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_415e1d55-3152-4d57-acbf-b612e195726c" xlink:to="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_5ebedf11-ee64-4388-b527-576909f37d2f" xlink:type="arc"/>

</link:calculationLink>

<link:roleRef roleURI="http://www.wfscorp.com/role/SummaryQuarterlyInformationUnaudited" xlink:type="simple" xlink:href="int-20201231.xsd#SummaryQuarterlyInformationUnaudited"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/SummaryQuarterlyInformationUnaudited" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/SummaryQuarterlyInformationUnauditedTables" xlink:type="simple" xlink:href="int-20201231.xsd#SummaryQuarterlyInformationUnauditedTables"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/SummaryQuarterlyInformationUnauditedTables" xlink:type="extended"/>

<link:roleRef roleURI="http://www.wfscorp.com/role/SummaryQuarterlyInformationUnauditedDetails" xlink:type="simple" xlink:href="int-20201231.xsd#SummaryQuarterlyInformationUnauditedDetails"/>

<link:calculationLink xlink:role="http://www.wfscorp.com/role/SummaryQuarterlyInformationUnauditedDetails" xlink:type="extended"/>

</link:linkbase>

4 Subsequent Filings that Reference this Filing

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

 2/23/24  World Kinect Corp.                10-K       12/31/23  110:15M                                    Workiva Inc Wde… FA01/FA
 2/24/23  World Kinect Corp.                10-K       12/31/22  110:16M                                    Workiva Inc Wde… FA01/FA
 2/25/22  World Kinect Corp.                10-K       12/31/21  110:19M                                    Workiva Inc Wde… FA01/FA
 8/09/21  World Kinect Corp.                S-8         8/09/21    3:102K                                   Workiva Inc Wde… FA01/FA

21 Previous Filings that this Filing References

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

 5/27/20  World Kinect Corp.                8-K:5,7,9   5/22/20   12:361K                                   Toppan Merrill/FA
 3/02/20  World Kinect Corp.                10-K       12/31/19  104:17M                                    Workiva Inc Wde… FA01/FA
 7/24/19  World Kinect Corp.                8-K:1,2,7,9 7/24/19    3:1.5M                                   Workiva Inc Wde… FA01/FA
 3/01/19  World Kinect Corp.                10-K       12/31/18  100:16M                                    Workiva Inc Wde… FA01/FA
 2/28/18  World Kinect Corp.                10-K       12/31/17  104:16M                                    Workiva Inc Wde… FA01/FA
 7/28/17  World Kinect Corp.                10-Q        6/30/17   66:9.2M                                   Workiva Inc Wde… FA01/FA
 2/21/17  World Kinect Corp.                10-K       12/31/16  100:17M                                    Workiva Inc Wde… FA01/FA
10/27/16  World Kinect Corp.                8-K:1,2,7,910/26/16    3:1.3M                                   Workiva Inc Wde… FA01/FA
 6/02/16  World Kinect Corp.                8-K:5,9     5/26/16    2:190K                                   Toppan Merrill/FA
 2/16/16  World Kinect Corp.                10-K       12/31/15   88:20M                                    Toppan Merrill Bridge/FA
 7/30/15  World Kinect Corp.                10-Q        6/30/15   55:9.1M                                   Toppan Merrill Bridge/FA
 2/05/15  World Kinect Corp.                8-K:1,2,9   1/30/15    2:1.5M                                   Toppan Merrill Bridge/FA
 7/30/14  World Kinect Corp.                10-Q        6/30/14   60:13M                                    Toppan Merrill/FA
 4/11/14  World Kinect Corp.                8-K:5,7,9   4/11/14    4:82K                                    Toppan Merrill/FA
10/11/13  World Fuel Services Corp.         8-K:1,2,7,910/10/13    3:1.3M                                   Toppan Merrill/FA
 4/13/12  World Fuel Services Corp.         8-K:5,9     4/09/12    2:26K                                    Business Wire/FA
 8/29/11  World Fuel Services Corp.         8-K:5,7,9   8/26/11    5:168K                                   Business Wire/FA
11/23/09  World Fuel Services Corp.         8-K:5,9    11/18/09    2:6K                                     Business Wire/FA
 3/20/08  World Fuel Services Corp.         8-K:5,9     3/14/08    4:417K                                   Donnelley … Solutions/FA
 4/16/07  World Fuel Services Corp.         8-K:5,9     4/16/07    4:128K                                   Donnelley … Solutions/FA
 2/03/05  World Fuel Services Corp.         8-K:5,9     1/31/05    3:33K                                    Donnelley … Solutions/FA

↑Top

Filing Submission 0001628280-21-003481 – Alternative Formats (Word / Rich Text, HTML, Plain Text, et al.)

World Fuel Services Corp. – ‘10-K’ for 12/31/20 – ‘EX-101.CAL’

On: Friday, 2/26/21, at 5:41pm ET · As of: 3/1/21 · For: 12/31/20 · Accession #: 1628280-21-3481 · File #: 1-09533

Annual Report — Form 10-KFiling Table of Contents

‘EX-101.CAL’ — XBRL Calculations — int-20201231_cal

This Exhibit is an XBRL XML File.

4 Subsequent Filings that Reference this Filing

21 Previous Filings that this Filing References

Annual Report — Form 10-K
Filing Table of Contents