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Schedule of Components of Unrealized Gain (Loss) on Securities (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Change in Components of Net Unrealized Gain on Securities |  |  |
Change in Net Unrealized Gain (Loss) on Securities | $ 1,439.3 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | $ (2,101.2)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | $ 918.8 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Fixed Maturity Securities |  |  |
Change in Components of Net Unrealized Gain on Securities |  |  |
Beginning of Period Balance | 4,054.8 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = us-gaap_DebtSecuritiesMember | 7,221.5 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = us-gaap_DebtSecuritiesMember |
Change in Net Unrealized Gain (Loss) on Securities | 2,206.7 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = us-gaap_DebtSecuritiesMember | (3,166.7)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = us-gaap_DebtSecuritiesMember |
End of Period Balance | 6,261.5 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = us-gaap_DebtSecuritiesMember | 4,054.8 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = us-gaap_DebtSecuritiesMember |
Other Investments |  |  |
Change in Components of Net Unrealized Gain on Securities |  |  |
Beginning of Period Balance | 55.5 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = us-gaap_OtherInvestmentsMember | 92.8 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = us-gaap_OtherInvestmentsMember |
Change in Net Unrealized Gain (Loss) on Securities | (41.6)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = us-gaap_OtherInvestmentsMember | (37.3)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = us-gaap_OtherInvestmentsMember |
End of Period Balance | 13.9 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = us-gaap_OtherInvestmentsMember | 55.5 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = us-gaap_OtherInvestmentsMember |
Deferred Acquisition Costs |  |  |
Change in Components of Net Unrealized Gain on Securities |  |  |
Beginning of Period Balance | (41.6)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = unm_DeferredAcquisitionCostsMember | (67.0)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = unm_DeferredAcquisitionCostsMember |
Change in Net Unrealized Gain (Loss) on Securities | (9.2)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = unm_DeferredAcquisitionCostsMember | 25.4 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = unm_DeferredAcquisitionCostsMember |
End of Period Balance | (50.8)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = unm_DeferredAcquisitionCostsMember | (41.6)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = unm_DeferredAcquisitionCostsMember |
Reserve for Future Policy and Contract Benefits |  |  |
Change in Components of Net Unrealized Gain on Securities |  |  |
Beginning of Period Balance | (4,108.5)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = unm_ReserveForFuturePolicyAndContractBenefitsMember | (6,277.5)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = unm_ReserveForFuturePolicyAndContractBenefitsMember |
Change in Net Unrealized Gain (Loss) on Securities | (2,041.8)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = unm_ReserveForFuturePolicyAndContractBenefitsMember | 2,169.0 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = unm_ReserveForFuturePolicyAndContractBenefitsMember |
End of Period Balance | (6,150.3)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = unm_ReserveForFuturePolicyAndContractBenefitsMember | (4,108.5)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = unm_ReserveForFuturePolicyAndContractBenefitsMember |
Reinsurance Recoverable |  |  |
Change in Components of Net Unrealized Gain on Securities |  |  |
Beginning of Period Balance | 263.8 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = unm_ReinsuranceRecoverableMember | 351.5 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = unm_ReinsuranceRecoverableMember |
Change in Net Unrealized Gain (Loss) on Securities | 101.2 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = unm_ReinsuranceRecoverableMember | (87.7)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = unm_ReinsuranceRecoverableMember |
End of Period Balance | 365.0 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = unm_ReinsuranceRecoverableMember | 263.8 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = unm_ReinsuranceRecoverableMember |
Deferred Income Tax Charges |  |  |
Change in Components of Net Unrealized Gain on Securities |  |  |
Beginning of Period Balance | (88.3)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = us-gaap_DeferredIncomeTaxChargesMember | (447.8)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = us-gaap_DeferredIncomeTaxChargesMember |
Change in Net Unrealized Gain (Loss) on Securities | (60.7)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = us-gaap_DeferredIncomeTaxChargesMember | 359.5 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = us-gaap_DeferredIncomeTaxChargesMember |
End of Period Balance | (149.0)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = us-gaap_DeferredIncomeTaxChargesMember | (88.3)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / unm_ComponentOfNetUnrealizedGainOnSecuritiesAxis = us-gaap_DeferredIncomeTaxChargesMember |
Net Unrealized Gain on Securities |  |  |
Change in Components of Net Unrealized Gain on Securities |  |  |
Beginning of Period Balance | 135.7 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 873.5 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Change in Net Unrealized Gain (Loss) on Securities | 154.6 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (737.8)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
End of Period Balance | $ 290.3 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | $ 135.7 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |

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- Definition Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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- Definition Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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