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Mortgage Loans, Sorted by Applicable Credit Quality Indicators (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Mortgage Loans on Real Estate |  |
Mortgage Loans | $ 1,856.6 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet | $ 1,815.1 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
Loan to Value Ratio Below or Equal to 65 Percent |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans | 898.7 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_InternalCreditAssessmentAxis = unm_LoanToValueRatioBelowOrEqualTo65PercentMember | 777.4 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_InternalCreditAssessmentAxis = unm_LoanToValueRatioBelowOrEqualTo65PercentMember
Loan To Value Ratio Above 65 To 75 Percent |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans | 818.0 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_InternalCreditAssessmentAxis = unm_LoanToValueRatioAbove65To75PercentMember | 867.5 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_InternalCreditAssessmentAxis = unm_LoanToValueRatioAbove65To75PercentMember
Loan To Value Ratio Above 75 To 85 Percent |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans | 102.3 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_InternalCreditAssessmentAxis = unm_LoanToValueRatioAbove75To85PercentMember | 107.6 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_InternalCreditAssessmentAxis = unm_LoanToValueRatioAbove75To85PercentMember
Loan To Value Ratio Above 85 Percent |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans | 37.6 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_InternalCreditAssessmentAxis = unm_LoanToValueRatioAbove85PercentMember | 62.6 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_InternalCreditAssessmentAxis = unm_LoanToValueRatioAbove85PercentMember
AA Credit Rating |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans | 7.7 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_InternalCreditAssessmentAxis = unm_AaCreditRatingMember | 10.8 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_InternalCreditAssessmentAxis = unm_AaCreditRatingMember
A Credit Rating |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans | 666.0 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_InternalCreditAssessmentAxis = unm_CreditRatingMember | 683.1 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_InternalCreditAssessmentAxis = unm_CreditRatingMember
Baa Credit Rating |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans | 1,156.7 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_InternalCreditAssessmentAxis = unm_BaaCreditRatingMember | 1,094.6 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_InternalCreditAssessmentAxis = unm_BaaCreditRatingMember
Ba Credit Rating |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans | 13.1 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_InternalCreditAssessmentAxis = unm_BaCreditRatingMember | 13.5 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_InternalCreditAssessmentAxis = unm_BaCreditRatingMember
B Credit Rating |  |
Mortgage Loans on Real Estate |  |
Mortgage Loans | $ 13.1 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_InternalCreditAssessmentAxis = unm_BCreditRatingMember | $ 13.1 us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet / us-gaap_InternalCreditAssessmentAxis = unm_BCreditRatingMember

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- 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph c -Article 7 + Details
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