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Parent Company Notes - Additional Details (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 1998 | Dec. 31, 2011
Repayments of Principal in 2016 | $ 350.0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo |  |  |  |
Repayments of Principal in 2018 | 200.0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour |  |  |  |
Repayments of Principal Thereafter | 2,081.0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive |  |  |  |
Notional Amount of Derivatives | 1,687.4 invest_DerivativeNotionalAmount | 1,477.4 invest_DerivativeNotionalAmount | 1,432.8 invest_DerivativeNotionalAmount |  | 1,413.0 invest_DerivativeNotionalAmount
Interest Paid | 145.9 us-gaap_InterestPaid | 144.6 us-gaap_InterestPaid | 139.6 us-gaap_InterestPaid |  |
Line of Credit Facility, Maximum Borrowing Capacity | 400.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  |  |  |
Line Of Credit Facility Maximum Borrowing Capacity If Requested | 600.0 unm_LineOfCreditFacilityMaximumBorrowingCapacityIfRequested |  |  |  |
Letters of Credit Outstanding | 2.1 us-gaap_LettersOfCreditOutstandingAmount | 0 us-gaap_LettersOfCreditOutstandingAmount |  |  |
Amount Outstanding on Line of Credit | 0 us-gaap_LineOfCredit | 0 us-gaap_LineOfCredit |  |  |
Long-term Debt and Capital Lease Obligations | 2,628.7 us-gaap_LongTermDebtAndCapitalLeaseObligations | 2,612.0 us-gaap_LongTermDebtAndCapitalLeaseObligations |  |  |
Parent Company |  |  |  |  |
Repayments of Principal in 2016 | 350.0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Repayments of Principal in 2018 | 200.0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Repayments of Principal Thereafter | 1,682.6 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Interest Paid | 123.6 us-gaap_InterestPaid / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 116.5 us-gaap_InterestPaid / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 109.0 us-gaap_InterestPaid / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Line of Credit Facility, Maximum Borrowing Capacity | 400.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Line Of Credit Facility Maximum Borrowing Capacity If Requested | 600.0 unm_LineOfCreditFacilityMaximumBorrowingCapacityIfRequested / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Letters of Credit Outstanding | 2.1 us-gaap_LettersOfCreditOutstandingAmount / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_LettersOfCreditOutstandingAmount / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Amount Outstanding on Line of Credit | 0 us-gaap_LineOfCredit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Long-term Debt and Capital Lease Obligations | 2,230.3 us-gaap_LongTermDebtAndCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,875.2 us-gaap_LongTermDebtAndCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Subsidiaries |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.85%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |
Guarantor Obligations, Liquidation Proceeds, Monetary Amount | 400.0 us-gaap_GuaranteeObligationsLiquidationProceeds / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |
Long-term Debt and Capital Lease Obligations | 151.9 us-gaap_LongTermDebtAndCapitalLeaseObligations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |
Receive Fixed/Pay Variable | Swaps |  |  |  |  |
Notional Amount of Derivatives | 600.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayVariableMember | 600.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayVariableMember |  |  |
Receive Fixed/Pay Variable | Swaps | Parent Company |  |  |  |  |
Notional Amount of Derivatives | 600.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentRiskAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayVariableMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |
Notes Issued in 1998 with 2038 Maturity Date | Junior Subordinated Debt |  |  |  |  |
Proceeds from Issuance of Senior Long-term Debt |  |  |  | 300.0 us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt / us-gaap_DebtInstrumentAxis = unm_NotesIssuedin1998with2038MaturityDateMember / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember |
Debt Instrument, Interest Rate, Stated Percentage | 7.405%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = unm_NotesIssuedin1998with2038MaturityDateMember / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember |  |  |  |
Liquidation value per capital security | $ 1,000 unm_LiquidationValuePerCapitalSecurity / us-gaap_DebtInstrumentAxis = unm_NotesIssuedin1998with2038MaturityDateMember / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember |  |  |  |
Notes Issued in 1998 with 2038 Maturity Date | Junior Subordinated Debt | Parent Company |  |  |  |  |
Proceeds from Issuance of Senior Long-term Debt |  |  |  | $ 300.0 us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt / us-gaap_DebtInstrumentAxis = unm_NotesIssuedin1998with2038MaturityDateMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember |
Debt Instrument, Interest Rate, Stated Percentage | 7.405%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = unm_NotesIssuedin1998with2038MaturityDateMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember |  |  |  |
Liquidation value per capital security | $ 1,000 unm_LiquidationValuePerCapitalSecurity / us-gaap_DebtInstrumentAxis = unm_NotesIssuedin1998with2038MaturityDateMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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