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Unum Group – ‘10-Q’ for 3/31/21 – ‘JSON’

On:  Thursday, 5/6/21, at 12:51pm ET   ·   For:  3/31/21   ·   Accession #:  5513-21-90   ·   File #:  1-11294

Previous ‘10-Q’:  ‘10-Q’ on 10/28/20 for 9/30/20   ·   Next:  ‘10-Q’ on 8/4/21 for 6/30/21   ·   Latest:  ‘10-Q’ on 11/1/23 for 9/30/23   ·   5 References:   

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

 5/06/21  Unum Group                        10-Q        3/31/21   93:18M

Quarterly Report   —   Form 10-Q

Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-Q        Quarterly Report                                    HTML   1.95M 
 2: EX-31.1     Certification -- §302 - SOA'02                      HTML     30K 
 3: EX-31.2     Certification -- §302 - SOA'02                      HTML     30K 
 4: EX-32.1     Certification -- §906 - SOA'02                      HTML     27K 
 5: EX-32.2     Certification -- §906 - SOA'02                      HTML     27K 
12: R1          Document and Entity Information                     HTML     84K 
13: R2          Consolidated Balance Sheets                         HTML    130K 
14: R3          Consolidated Balance Sheets (Parenthetical)         HTML     52K 
15: R4          Consolidated Statements of Income (Unaudited)       HTML    107K 
16: R5          Consolidated Statements of Comprehensive Loss       HTML     61K 
17: R6          Consolidated Statements of Comprehensive Loss       HTML     39K 
                (Parenthetical)                                                  
18: R7          Consolidated Statements of Stockholders' Equity     HTML     61K 
19: R8          Consolidated Statements of Stockholders' Equity     HTML     28K 
                (Parenthetical)                                                  
20: R9          Consolidated Statements of Cash Flows (Unaudited)   HTML    107K 
21: R10         Basis of Presentation                               HTML     29K 
22: R11         Accounting Developments                             HTML     55K 
23: R12         Fair Values of Financial Instruments                HTML    457K 
24: R13         Investments                                         HTML    498K 
25: R14         Derivative Financial Instruments                    HTML    201K 
26: R15         Accumulated Other Comprehensive Income (Loss)       HTML    115K 
27: R16         Liability for Unpaid Claims and Claim Adjustment    HTML     61K 
                Expenses                                                         
28: R17         Segment Information                                 HTML    135K 
29: R18         Employee Benefit Plans                              HTML     58K 
30: R19         Stockholders' Equity and Earnings Per Common Share  HTML     49K 
31: R20         Commitments and Contingent Liabilities              HTML     41K 
32: R21         Other                                               HTML     37K 
33: R22         Basis of Presentation (Policies)                    HTML     28K 
34: R23         Fair Values of Financial Instruments (Tables)       HTML    381K 
35: R24         Investments (Tables)                                HTML    497K 
36: R25         Derivative Financial Instruments (Tables)           HTML    196K 
37: R26         Accumulated Other Comprehensive Income (Loss)       HTML    119K 
                (Tables)                                                         
38: R27         Liability for Unpaid Claims and Claim Adjustment    HTML     61K 
                Expenses (Tables)                                                
39: R28         Segment Information (Tables)                        HTML    136K 
40: R29         Employee Benefit Plans (Tables)                     HTML     54K 
41: R30         Stockholders' Equity and Earnings Per Common Share  HTML     39K 
                (Tables)                                                         
42: R31         Accounting Developments Additional Information      HTML     33K 
                (Details)                                                        
43: R32         Fair Values of Financial Instruments Private        HTML     59K 
                Equity Partnerships (Details)                                    
44: R33         Fair Value Measurements by Input Level (Detail)     HTML    163K 
45: R34         Changes in Assets and Liabilities Measured at Fair  HTML    115K 
                Value on a Recurring Basis using Significant                     
                Unobservable Inputs (Level 3) (Detail)                           
46: R35         Quantitative Information Regarding Significant      HTML     53K 
                Unobservable Inputs (Details)                                    
47: R36         Fair Values of Financial Instruments Carrying       HTML     74K 
                Amounts and Estimated Fair value of Financial                    
                Instruments Not Measured at Fair Value (Details)                 
48: R37         Fair Value of Financial Instruments Additional      HTML     45K 
                Information (Detail)                                             
49: R38         Amortized Cost and Fair Values of Securities by     HTML     75K 
                Security Type (Detail)                                           
50: R39         Length of Time Fixed Maturity Securities had been   HTML     62K 
                in a Gross Unrealized Loss Position (Detail)                     
51: R40         Investments Distribution of the Maturity Dates for  HTML    104K 
                Fixed Maturity Securities (Details)                              
52: R41         Investments Distribution by External Credit Rating  HTML     43K 
                for Fixed Maturity Securities (Details)                          
53: R42         Debt Securities, Available-for-sale, Allowance for  HTML     37K 
                Credit Losses Rollforward (Details)                              
54: R43         Investments Low Income Housing Tax Credits          HTML     32K 
                (Details)                                                        
55: R44         Mortgage Loans by Property Type and Geographic      HTML     68K 
                Region (Detail)                                                  
56: R45         Schedule of Participating Mortgage Loans by         HTML     55K 
                Internal Credit Rating and Loan to Value (Details)               
57: R46         Mortgage Loans, Sorted by Applicable Credit         HTML    137K 
                Quality Indicators (Detail)                                      
58: R47         Mortgage Loans, Allowance for Credit Losses         HTML     58K 
                Rollforward (Details)                                            
59: R48         Investments Remaining Contractual Maturity of       HTML     45K 
                Security Lending Agreements(Details)                             
60: R49         Investments Federal Home Loan Bank Carrying         HTML     37K 
                Amount, Collateral Posted and Advances Received                  
                (Details)                                                        
61: R50         Investments Schedule of Financial Instrument and    HTML    138K 
                Derivative Offsetting (Details)                                  
62: R51         Investments Investment Income (Detail)              HTML     54K 
63: R52         Realized Investment Gains and Losses Reported in    HTML     50K 
                Consolidated Statements of Income (Detail)                       
64: R53         Investments - Additional Information (Detail)       HTML     95K 
65: R54         Derivative Financial Instruments Nature and Amount  HTML     36K 
                of Collateral Received From and Posted To Our                    
                Derivative Counterparties (Details)                              
66: R55         Notional Amounts for Each Category of Derivative    HTML     54K 
                Activity (Detail)                                                
67: R56         Derivative Financial Instruments Fair Value Hedges  HTML     36K 
                Carrying Amount of Hedged Assets and Cumulative                  
                Basis Adjustments (Details)                                      
68: R57         Location and Fair Values of Derivative Financial    HTML     61K 
                Instruments (Detail)                                             
69: R58         Derivative Financial Instruments Location of Gains  HTML     62K 
                and Losses Designated as Hedging Instruments,                    
                Consolidated Statements of Income (Details)                      
70: R59         Location of Gains and Losses on Derivative          HTML     33K 
                Instruments Designated as Cash Flow Hedging                      
                Instruments (Detail)                                             
71: R60         Gains and Losses on Derivatives Not Designated as   HTML     39K 
                Hedging Instruments (Detail)                                     
72: R61         Derivative Financial Instruments - Additional       HTML     86K 
                Information (Detail)                                             
73: R62         Schedule of Accumulated Other Comprehensive Income  HTML     65K 
                (Loss) (Details)                                                 
74: R63         Schedule of Components of Unrealized Gain (Loss)    HTML     49K 
                on Securities (Details)                                          
75: R64         Schedule of Reclassifications Out of Accumulated    HTML     81K 
                Other Comprehensive Income (Loss) (Details)                      
76: R65         Liability for Unpaid Claims and Claims Adjustment   HTML     62K 
                Expense (Detail)                                                 
77: R66         Reconciliation of Policy and Contract Benefits and  HTML     43K 
                Reserves for Future Policy and Contract Benefits                 
                (Detail)                                                         
78: R67         Liability for Unpaid Claims and CAE - Additional    HTML     34K 
                Information (Details)                                            
79: R68         Premium Income by Major Line of Business within     HTML     72K 
                Each Segment (Detail)                                            
80: R69         Selected Operating Statement Data by Segment        HTML     57K 
                (Detail)                                                         
81: R70         Assets by Segment (Detail)                          HTML     46K 
82: R71         Reconciliation of Total Revenue and Income Before   HTML     58K 
                Income Tax to Operating Revenue and Operating                    
                Income (Detail)                                                  
83: R72         Segment Information Segments - Additional           HTML     28K 
                Information (Detail)                                             
84: R73         Employee Benefit Plans Net Periodic Benefit Cost    HTML     56K 
                (Detail)                                                         
85: R74         Basic and Diluted Earnings Per Share (Detail)       HTML     61K 
86: R75         Stockholders' Equity and Earnings Per Common Share  HTML     42K 
                - Additional Information (Detail)                                
87: R76         Reinsurance (Details)                               HTML     52K 
88: R77         Premium Receivable, Allowance for Credit Loss       HTML     33K 
                (Details)                                                        
89: R9999       Uncategorized Items - unm-20210331.htm              HTML     30K 
91: XML         IDEA XML File -- Filing Summary                      XML    171K 
11: XML         XBRL Instance -- unm-20210331_htm                    XML   5.94M 
90: EXCEL       IDEA Workbook of Financial Reports                  XLSX    147K 
 7: EX-101.CAL  XBRL Calculations -- unm-20210331_cal                XML    274K 
 8: EX-101.DEF  XBRL Definitions -- unm-20210331_def                 XML   1.26M 
 9: EX-101.LAB  XBRL Labels -- unm-20210331_lab                      XML   2.48M 
10: EX-101.PRE  XBRL Presentations -- unm-20210331_pre               XML   1.57M 
 6: EX-101.SCH  XBRL Schema -- unm-20210331                          XSD    257K 
92: JSON        XBRL Instance as JSON Data -- MetaLinks              574±   841K 
93: ZIP         XBRL Zipped Folder -- 0000005513-21-000090-xbrl      Zip    535K

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                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "submissionTypeItemType"
                },
            "dei_EntitiesTable":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Container to assemble all relevant information about each entity associated with the document instance",
                            "label":  "Entities [Table]",
                            "terseLabel":  "Entities [Table]"
                            }
                        }
                    },
                "localname":  "EntitiesTable",
                "nsuri":  "http://xbrl.sec.gov/dei/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "stringItemType"
                },
            "dei_EntityAddressAddressLine1":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Address Line 1 such as Attn, Building Name, Street Name",
                            "label":  "Entity Address, Address Line One",
                            "terseLabel":  "Entity Address, Address Line One"
                            }
                        }
                    },
                "localname":  "EntityAddressAddressLine1",
                "nsuri":  "http://xbrl.sec.gov/dei/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "normalizedStringItemType"
                },
            "dei_EntityAddressCityOrTown":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Name of the City or Town",
                            "label":  "Entity Address, City or Town",
                            "terseLabel":  "Entity Address, City or Town"
                            }
                        }
                    },
                "localname":  "EntityAddressCityOrTown",
                "nsuri":  "http://xbrl.sec.gov/dei/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "normalizedStringItemType"
                },
            "dei_EntityAddressPostalZipCode":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Code for the postal or zip code",
                            "label":  "Entity Address, Postal Zip Code",
                            "terseLabel":  "Entity Address, Postal Zip Code"
                            }
                        }
                    },
                "localname":  "EntityAddressPostalZipCode",
                "nsuri":  "http://xbrl.sec.gov/dei/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "normalizedStringItemType"
                },
            "dei_EntityAddressStateOrProvince":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Name of the state or province.",
                            "label":  "Entity Address, State or Province",
                            "terseLabel":  "Entity Address, State or Province"
                            }
                        }
                    },
                "localname":  "EntityAddressStateOrProvince",
                "nsuri":  "http://xbrl.sec.gov/dei/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "stateOrProvinceItemType"
                },
            "dei_EntityCentralIndexKey":  {
                "auth_ref":  [
                    "r815"
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC.  It is commonly abbreviated as CIK.",
                            "label":  "Entity Central Index Key",
                            "terseLabel":  "Entity Central Index Key"
                            }
                        }
                    },
                "localname":  "EntityCentralIndexKey",
                "nsuri":  "http://xbrl.sec.gov/dei/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "centralIndexKeyItemType"
                },
            "dei_EntityCommonStockSharesOutstanding":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report.  Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.",
                            "label":  "Entity Common Stock, Shares Outstanding",
                            "terseLabel":  "Entity Common Stock, Shares Outstanding"
                            }
                        }
                    },
                "localname":  "EntityCommonStockSharesOutstanding",
                "nsuri":  "http://xbrl.sec.gov/dei/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "dei_EntityCurrentReportingStatus":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Indicate 'Yes' or 'No' whether registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days.  This information should be based on the registrant's current or most recent filing containing the related disclosure.",
                            "label":  "Entity Current Reporting Status",
                            "terseLabel":  "Entity Current Reporting Status"
                            }
                        }
                    },
                "localname":  "EntityCurrentReportingStatus",
                "nsuri":  "http://xbrl.sec.gov/dei/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "yesNoItemType"
                },
            "dei_EntityEmergingGrowthCompany":  {
                "auth_ref":  [
                    "r815"
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Indicate if registrant meets the emerging growth company criteria.",
                            "label":  "Entity Emerging Growth Company",
                            "terseLabel":  "Entity Emerging Growth Company"
                            }
                        }
                    },
                "localname":  "EntityEmergingGrowthCompany",
                "nsuri":  "http://xbrl.sec.gov/dei/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "booleanItemType"
                },
            "dei_EntityFileNumber":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Commission file number.  The field allows up to 17 characters.  The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.",
                            "label":  "Entity File Number",
                            "terseLabel":  "Entity File Number"
                            }
                        }
                    },
                "localname":  "EntityFileNumber",
                "nsuri":  "http://xbrl.sec.gov/dei/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "fileNumberItemType"
                },
            "dei_EntityFilerCategory":  {
                "auth_ref":  [
                    "r815"
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Indicate whether the registrant is one of the following:  Large Accelerated Filer, Accelerated Filer, Non-accelerated Filer.  Definitions of these categories are stated in Rule 12b-2 of the Exchange Act.  This information should be based on the registrant's current or most recent filing containing the related disclosure.",
                            "label":  "Entity Filer Category",
                            "terseLabel":  "Entity Filer Category"
                            }
                        }
                    },
                "localname":  "EntityFilerCategory",
                "nsuri":  "http://xbrl.sec.gov/dei/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "filerCategoryItemType"
                },
            "dei_EntityIncorporationStateCountryCode":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Two-character EDGAR code representing the state or country of incorporation.",
                            "label":  "Entity Incorporation, State or Country Code",
                            "terseLabel":  "Entity Incorporation, State or Country Code"
                            }
                        }
                    },
                "localname":  "EntityIncorporationStateCountryCode",
                "nsuri":  "http://xbrl.sec.gov/dei/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "edgarStateCountryItemType"
                },
            "dei_EntityInformationLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Entity Information [Line Items]",
                            "terseLabel":  "Entity Information [Line Items]"
                            }
                        }
                    },
                "localname":  "EntityInformationLineItems",
                "nsuri":  "http://xbrl.sec.gov/dei/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "stringItemType"
                },
            "dei_EntityInteractiveDataCurrent":  {
                "auth_ref":  [
                    "r831"
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Boolean flag that is true when the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).",
                            "label":  "Entity Interactive Data Current",
                            "terseLabel":  "Entity Interactive Data Current"
                            }
                        }
                    },
                "localname":  "EntityInteractiveDataCurrent",
                "nsuri":  "http://xbrl.sec.gov/dei/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "yesNoItemType"
                },
            "dei_EntityListingsExchangeAxis":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "The axis of a table defines the relationship between the domain members or categories in the table and the line items or concepts that complete the table.",
                            "label":  "Entity Listings, Exchange [Axis]",
                            "terseLabel":  "Entity Listings, Exchange [Axis]"
                            }
                        }
                    },
                "localname":  "EntityListingsExchangeAxis",
                "nsuri":  "http://xbrl.sec.gov/dei/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "stringItemType"
                },
            "dei_EntityRegistrantName":  {
                "auth_ref":  [
                    "r815"
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.",
                            "label":  "Entity Registrant Name",
                            "terseLabel":  "Entity Registrant Name"
                            }
                        }
                    },
                "localname":  "EntityRegistrantName",
                "nsuri":  "http://xbrl.sec.gov/dei/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "normalizedStringItemType"
                },
            "dei_EntityShellCompany":  {
                "auth_ref":  [
                    "r815"
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Boolean flag that is true when the registrant is a shell company as defined in Rule 12b-2 of the Exchange Act.",
                            "label":  "Entity Shell Company",
                            "terseLabel":  "Entity Shell Company"
                            }
                        }
                    },
                "localname":  "EntityShellCompany",
                "nsuri":  "http://xbrl.sec.gov/dei/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "booleanItemType"
                },
            "dei_EntitySmallBusiness":  {
                "auth_ref":  [
                    "r815"
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Indicates that the company is a Smaller Reporting Company (SRC).",
                            "label":  "Entity Small Business",
                            "terseLabel":  "Entity Small Business"
                            }
                        }
                    },
                "localname":  "EntitySmallBusiness",
                "nsuri":  "http://xbrl.sec.gov/dei/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "booleanItemType"
                },
            "dei_EntityTaxIdentificationNumber":  {
                "auth_ref":  [
                    "r815"
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.",
                            "label":  "Entity Tax Identification Number",
                            "terseLabel":  "Entity Tax Identification Number"
                            }
                        }
                    },
                "localname":  "EntityTaxIdentificationNumber",
                "nsuri":  "http://xbrl.sec.gov/dei/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "employerIdItemType"
                },
            "dei_ExchangeDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "The set of all exchanges.  MIC exchange codes are drawn from ISO 10383.",
                            "label":  "Exchange [Domain]",
                            "terseLabel":  "Exchange [Domain]"
                            }
                        }
                    },
                "localname":  "ExchangeDomain",
                "nsuri":  "http://xbrl.sec.gov/dei/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "domainItemType"
                },
            "dei_LocalPhoneNumber":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Local phone number for entity.",
                            "label":  "Local Phone Number",
                            "terseLabel":  "Local Phone Number"
                            }
                        }
                    },
                "localname":  "LocalPhoneNumber",
                "nsuri":  "http://xbrl.sec.gov/dei/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "normalizedStringItemType"
                },
            "dei_Security12bTitle":  {
                "auth_ref":  [
                    "r811"
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Title of a 12(b) registered security.",
                            "label":  "Title of 12(b) Security",
                            "terseLabel":  "Title of 12(g) Security"
                            }
                        }
                    },
                "localname":  "Security12bTitle",
                "nsuri":  "http://xbrl.sec.gov/dei/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "securityTitleItemType"
                },
            "dei_SecurityExchangeName":  {
                "auth_ref":  [
                    "r812"
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Name of the Exchange on which a security is registered.",
                            "label":  "Security Exchange Name",
                            "terseLabel":  "Security Exchange Name"
                            }
                        }
                    },
                "localname":  "SecurityExchangeName",
                "nsuri":  "http://xbrl.sec.gov/dei/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "edgarExchangeCodeItemType"
                },
            "dei_TradingSymbol":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "documentation":  "Trading symbol of an instrument as listed on an exchange.",
                            "label":  "Trading Symbol",
                            "terseLabel":  "Trading Symbol"
                            }
                        }
                    },
                "localname":  "TradingSymbol",
                "nsuri":  "http://xbrl.sec.gov/dei/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "tradingSymbolItemType"
                },
            "exch_XNYS":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "label":  "NEW YORK STOCK EXCHANGE, INC. [Member]",
                            "terseLabel":  "NEW YORK STOCK EXCHANGE, INC."
                            }
                        }
                    },
                "localname":  "XNYS",
                "nsuri":  "http://xbrl.sec.gov/exch/2021",
                "presentation":  [
                    "http://www.unum.com/role/DocumentandEntityInformation"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_ApartmentBuildingMember":  {
                "auth_ref":  [
                    "r791",
                    "r803"
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "label":  "Apartment Building [Member]",
                            "terseLabel":  "Apartment"
                            }
                        }
                    },
                "localname":  "ApartmentBuildingMember",
                "nsuri":  "http://fasb.org/srt/2021-01-31",
                "presentation":  [
                    "http://www.unum.com/role/MortgageLoansbyPropertyTypeandGeographicRegionDetail"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_ConsolidatedEntitiesAxis":  {
                "auth_ref":  [
                    "r115",
                    "r315",
                    "r320",
                    "r328",
                    "r485",
                    "r486",
                    "r489",
                    "r490",
                    "r605",
                    "r804"
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "label":  "Consolidated Entities [Axis]",
                            "terseLabel":  "Consolidated Entities"
                            }
                        }
                    },
                "localname":  "ConsolidatedEntitiesAxis",
                "nsuri":  "http://fasb.org/srt/2021-01-31",
                "presentation":  [
                    "http://www.unum.com/role/InvestmentsAdditionalInformationDetail"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_ConsolidatedEntitiesDomain":  {
                "auth_ref":  [
                    "r115",
                    "r315",
                    "r320",
                    "r328",
                    "r485",
                    "r486",
                    "r489",
                    "r490",
                    "r605",
                    "r804"
                    ],
                "lang":  {
                    "en-us":  {
                        "role":  {
                            "label":  "Consolidated Entities [Domain]",
                            "terseLabel":  "Consolidated Entities"
                            }
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                    "r436",
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                    "r439",
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}

2 Subsequent Filings that Reference this Filing

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

 6/11/21  Unum Group                        424B2                  1:776K                                   Donnelley … Solutions/FA
 6/09/21  Unum Group                        424B5                  1:768K                                   Donnelley … Solutions/FA

3 Previous Filings that this Filing References

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

 4/05/21  Unum Group                        8-K:1,9     3/31/21   15:2M
 3/17/21  Unum Group                        8-K:5,9     3/16/21   13:473K
 3/02/21  Unum Group                        8-K:5,9     3/01/21   14:445K
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