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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Comprehensive Income [Abstract]      
Net Income $ 413.4us-gaap_NetIncomeLoss $ 858.1us-gaap_NetIncomeLoss $ 894.4us-gaap_NetIncomeLoss
Other Comprehensive Income (Loss)      
Change in Net Unrealized Gain on Securities Before Adjustment (net of tax expense (benefit) of $725.8; $(1,102.8); $467.7) 1,439.3us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax (2,101.2)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 918.8us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance (net of tax expense (benefit) of $(665.1); $743.3; $(325.6)) (1,284.7)unm_ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceAndNetOfTaxExpenseBenefit 1,363.4unm_ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceAndNetOfTaxExpenseBenefit (660.1)unm_ChangeInAdjustmentToDeferredAcquisitionCostsAndReservesForFuturePolicyAndContractBenefitsNetOfReinsuranceAndNetOfTaxExpenseBenefit
Change in Net Gain on Cash Flow Hedges (net of tax benefit of $2.0 $1.3; $4.3) (5.3)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax (5.3)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax (7.1)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Change in Foreign Currency Translation Adjustment (66.3)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 25.5us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 45.0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense (benefit) of $(92.4); $185.2; $(68.0)) (171.6)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 344.6us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax (130.4)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Total Other Comprehensive Income (Loss) (88.6)us-gaap_OtherComprehensiveIncomeLossNetOfTax (373.0)us-gaap_OtherComprehensiveIncomeLossNetOfTax 166.2us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive Income $ 324.8us-gaap_ComprehensiveIncomeNetOfTax $ 485.1us-gaap_ComprehensiveIncomeNetOfTax $ 1,060.6us-gaap_ComprehensiveIncomeNetOfTax