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Segment Information Deferred Acquisition Costs by Segment (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Movement Analysis of Deferred Policy Acquisition Costs |  |  |
Deferred Acquisition Costs at Beginning of Year | $ 1,829.2 us-gaap_DeferredPolicyAcquisitionCosts |  |
Deferred Policy Acquisition Cost, Amortization Expense | (440.8)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense | (418.9)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense | (378.7)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense
Deferred Acquisition Costs at End of Year | 1,901.3 us-gaap_DeferredPolicyAcquisitionCosts | 1,829.2 us-gaap_DeferredPolicyAcquisitionCosts |
Operating Segments |  |  |
Movement Analysis of Deferred Policy Acquisition Costs |  |  |
Deferred Acquisition Costs at Beginning of Year | 1,829.2 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 1,755.5 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 1,677.1 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Deferral of Acquisition Costs | 524.0 us-gaap_DeferredPolicyAcquisitionCostsAdditions / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 466.8 us-gaap_DeferredPolicyAcquisitionCostsAdditions / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 467.3 us-gaap_DeferredPolicyAcquisitionCostsAdditions / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Deferred Policy Acquisition Cost, Amortization Expense | (440.8)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | (418.9)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | (378.7)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Adjustment Related to Unrealized Investment (Gain) Loss | (9.2)unm_AdjustmentRelatedToUnrealizedInvestmentGainLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 25.4 unm_AdjustmentRelatedToUnrealizedInvestmentGainLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | (12.0)unm_AdjustmentRelatedToUnrealizedInvestmentGainLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Deferred Policy Acquisition Costs Foreign Currency Translation Adjustment And Other | (1.9)unm_DeferredPolicyAcquisitionCostsForeignCurrencyTranslationAdjustmentAndOther / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 0.4 unm_DeferredPolicyAcquisitionCostsForeignCurrencyTranslationAdjustmentAndOther / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 1.8 unm_DeferredPolicyAcquisitionCostsForeignCurrencyTranslationAdjustmentAndOther / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Deferred Acquisition Costs at End of Year | 1,901.3 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 1,829.2 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 1,755.5 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Operating Segments | Unum U.S. |  |  |
Movement Analysis of Deferred Policy Acquisition Costs |  |  |
Deferred Acquisition Costs at Beginning of Year | 1,051.5 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember | 1,024.3 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember | 971.8 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember
Deferral of Acquisition Costs | 292.7 us-gaap_DeferredPolicyAcquisitionCostsAdditions / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember | 252.0 us-gaap_DeferredPolicyAcquisitionCostsAdditions / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember | 249.2 us-gaap_DeferredPolicyAcquisitionCostsAdditions / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember
Deferred Policy Acquisition Cost, Amortization Expense | (248.1)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember | (230.0)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember | (196.5)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember
Adjustment Related to Unrealized Investment (Gain) Loss | 0.4 unm_AdjustmentRelatedToUnrealizedInvestmentGainLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember | 5.2 unm_AdjustmentRelatedToUnrealizedInvestmentGainLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember | (0.2)unm_AdjustmentRelatedToUnrealizedInvestmentGainLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember
Deferred Policy Acquisition Costs Foreign Currency Translation Adjustment And Other | 0 unm_DeferredPolicyAcquisitionCostsForeignCurrencyTranslationAdjustmentAndOther / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember | 0 unm_DeferredPolicyAcquisitionCostsForeignCurrencyTranslationAdjustmentAndOther / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember | 0 unm_DeferredPolicyAcquisitionCostsForeignCurrencyTranslationAdjustmentAndOther / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember
Deferred Acquisition Costs at End of Year | 1,096.5 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember | 1,051.5 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember | 1,024.3 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember
Operating Segments | Unum U.K. |  |  |
Movement Analysis of Deferred Policy Acquisition Costs |  |  |
Deferred Acquisition Costs at Beginning of Year | 34.3 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUkMember | 38.8 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUkMember | 40.9 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUkMember
Deferral of Acquisition Costs | 10.5 us-gaap_DeferredPolicyAcquisitionCostsAdditions / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUkMember | 9.8 us-gaap_DeferredPolicyAcquisitionCostsAdditions / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUkMember | 11.8 us-gaap_DeferredPolicyAcquisitionCostsAdditions / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUkMember
Deferred Policy Acquisition Cost, Amortization Expense | (12.5)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUkMember | (14.7)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUkMember | (15.7)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUkMember
Adjustment Related to Unrealized Investment (Gain) Loss | 0 unm_AdjustmentRelatedToUnrealizedInvestmentGainLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUkMember | 0 unm_AdjustmentRelatedToUnrealizedInvestmentGainLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUkMember | 0 unm_AdjustmentRelatedToUnrealizedInvestmentGainLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUkMember
Deferred Policy Acquisition Costs Foreign Currency Translation Adjustment And Other | (1.9)unm_DeferredPolicyAcquisitionCostsForeignCurrencyTranslationAdjustmentAndOther / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUkMember | 0.4 unm_DeferredPolicyAcquisitionCostsForeignCurrencyTranslationAdjustmentAndOther / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUkMember | 1.8 unm_DeferredPolicyAcquisitionCostsForeignCurrencyTranslationAdjustmentAndOther / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUkMember
Deferred Acquisition Costs at End of Year | 30.4 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUkMember | 34.3 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUkMember | 38.8 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUkMember
Operating Segments | Colonial Life |  |  |
Movement Analysis of Deferred Policy Acquisition Costs |  |  |
Deferred Acquisition Costs at Beginning of Year | 743.4 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember | 692.4 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember | 664.4 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember
Deferral of Acquisition Costs | 220.8 us-gaap_DeferredPolicyAcquisitionCostsAdditions / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember | 205.0 us-gaap_DeferredPolicyAcquisitionCostsAdditions / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember | 206.3 us-gaap_DeferredPolicyAcquisitionCostsAdditions / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember
Deferred Policy Acquisition Cost, Amortization Expense | (180.2)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember | (174.2)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember | (166.5)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember
Adjustment Related to Unrealized Investment (Gain) Loss | (9.6)unm_AdjustmentRelatedToUnrealizedInvestmentGainLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember | 20.2 unm_AdjustmentRelatedToUnrealizedInvestmentGainLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember | (11.8)unm_AdjustmentRelatedToUnrealizedInvestmentGainLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember
Deferred Policy Acquisition Costs Foreign Currency Translation Adjustment And Other | 0 unm_DeferredPolicyAcquisitionCostsForeignCurrencyTranslationAdjustmentAndOther / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember | 0 unm_DeferredPolicyAcquisitionCostsForeignCurrencyTranslationAdjustmentAndOther / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember | 0 unm_DeferredPolicyAcquisitionCostsForeignCurrencyTranslationAdjustmentAndOther / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember
Deferred Acquisition Costs at End of Year | $ 774.4 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember | $ 743.4 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember | $ 692.4 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember

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