XML 49 R39.htm IDEA: XBRL DOCUMENT
v3.23.1

Fair Values of Financial Instruments Carrying Amounts and Estimated Fair value of Financial Instruments Not Measured at Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Mortgage Loans, Carrying Amount | $ 2,390.0 | $ 2,435.4
Policy Loans | 3,552.5 | 3,601.2
Long-term Debt | 3,428.5 | 3,427.8
Liabilities, Fair Value Disclosure | 62.9 | 87.9
Fair Value, Nonrecurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Mortgage Loans, Fair Value Disclosure | 2,157.5 | 2,159.5
Mortgage Loans, Carrying Amount | 2,390.0 | 2,435.4
Policy Loans, Fair Value Disclosure | 3,633.3 | 3,677.0
Policy Loans | 3,552.5 | 3,601.2
Miscellaneous Long-Term Investments, Fair Value Disclosure | 16.8 | 18.4
Miscellaneous Long-Term Investments | 16.8 | 18.4
Financial Instruments, Financial Assets Fair Value Disclosure | 5,807.6 | 5,854.9
Total Financial Instrument Assets Not Carried at Fair Value | 5,959.3 | 6,055.0
Long-term Debt, Fair Value Disclosure | 3,147.9 | 3,072.0
Long-term Debt | 3,428.5 | 3,427.8
Unfunded Commitments | 0.7 | 0.7
Federal Home Loan Bank Funding Agreements, Fair Value Disclosure | 68.0 | 99.1
Federal Home Loan Bank Funding Agreements | 68.0 | 99.1
Liabilities, Fair Value Disclosure | 3,216.6 | 3,171.8
Total Financial Instrument Liabilities Not Carried at Fair Value | 3,497.2 | 3,527.6
Fair Value, Inputs, Level 1 | Fair Value, Nonrecurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Mortgage Loans, Fair Value Disclosure | 0.0 | 0.0
Policy Loans, Fair Value Disclosure | 0.0 | 0.0
Miscellaneous Long-Term Investments, Fair Value Disclosure | 0.0 | 0.0
Financial Instruments, Financial Assets Fair Value Disclosure | 0.0 | 0.0
Long-term Debt, Fair Value Disclosure | 2,630.7 | 2,288.9
Unfunded Commitments | 0.0 | 0.0
Federal Home Loan Bank Funding Agreements, Fair Value Disclosure | 0.0 | 0.0
Liabilities, Fair Value Disclosure | 2,630.7 | 2,288.9
Fair Value, Inputs, Level 2 | Fair Value, Nonrecurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Mortgage Loans, Fair Value Disclosure | 2,157.5 | 2,159.5
Policy Loans, Fair Value Disclosure | 0.0 | 0.0
Miscellaneous Long-Term Investments, Fair Value Disclosure | 15.7 | 17.1
Financial Instruments, Financial Assets Fair Value Disclosure | 2,173.2 | 2,176.6
Long-term Debt, Fair Value Disclosure | 517.2 | 783.1
Unfunded Commitments | 0.7 | 0.7
Federal Home Loan Bank Funding Agreements, Fair Value Disclosure | 68.0 | 99.1
Liabilities, Fair Value Disclosure | 585.9 | 882.9
Fair Value, Inputs, Level 3 | Fair Value, Nonrecurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Mortgage Loans, Fair Value Disclosure | 0.0 | 0.0
Policy Loans, Fair Value Disclosure | 3,633.3 | 3,677.0
Miscellaneous Long-Term Investments, Fair Value Disclosure | 1.1 | 1.3
Financial Instruments, Financial Assets Fair Value Disclosure | 3,634.4 | 3,678.3
Long-term Debt, Fair Value Disclosure | 0.0 | 0.0
Unfunded Commitments | 0.0 | 0.0
Federal Home Loan Bank Funding Agreements, Fair Value Disclosure | 0.0 | 0.0
Liabilities, Fair Value Disclosure | $ 0.0 | $ 0.0

X
- Definition Financial Instruments, Financial Assets Fair Value Disclosure, Carrying Value + References No definition available. + Details
Name: | unm_FinancialInstrumentsFinancialAssetsFairValueDisclosureCarryingValue
Namespace Prefix: | unm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financial Instruments, Financial Assets Fair Value Disclosure, Total + References No definition available. + Details
Name: | unm_FinancialInstrumentsFinancialAssetsFairValueDisclosureTotal
Namespace Prefix: | unm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Miscellaneous Long-Term Investments + References No definition available. + Details
Name: | unm_MiscellaneousLongTermInvestments
Namespace Prefix: | unm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Miscellaneous Long-Term Investments, Carrying Value + References No definition available. + Details
Name: | unm_MiscellaneousLongTermInvestmentsCarryingValue
Namespace Prefix: | unm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Total Financial Instrument Liabilities Not Carried at Fair Value + References No definition available. + Details
Name: | unm_TotalFinancialInstrumentLiabilitiesNotCarriedatFairValue
Namespace Prefix: | unm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition 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. + References No definition available. + Details
Name: | us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of Federal Home Loan Bank (FHLBank) advances to member financial institutions. + References No definition available. + Details
Name: | us-gaap_FederalHomeLoanBankAdvances
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of borrowing from Federal Home Loan Bank (FHLBank). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(3)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
Name: | us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount before allowance of loans made to policy and contract holders using their life insurance contracts' cash value or separate accounts as collateral. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums over and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(e)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
Name: | us-gaap_LoansInsurancePolicy
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Publisher FASB -URI https://asc.fasb.org//310-10/tableOfContent + Details
Name: | us-gaap_LoansReceivableFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of long-term debt and lease obligation, classified as noncurrent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
Name: | us-gaap_LongTermDebtAndCapitalLeaseObligations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + Details
Name: | us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of mortgage loans held-for-sale. + References No definition available. + Details
Name: | us-gaap_MortgagesHeldForSaleFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of notes payable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_NotesPayableFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of commitment or contingent commitments to qualified affordable housing project investments. + References Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 323 -SubTopic 740 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481543/323-740-50-2 + Details
Name: | us-gaap_QualifiedAffordableHousingProjectInvestmentsCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |