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v2.4.1.9

Reconciliation of Operating Revenue and Operating Income by Segment to Total Revenue and Income Before Income Tax (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting, Revenue Reconciling Item |  |  |  |  |  |  |  |  |  |  |
Net Realized Investment Gain | $ (17.3)us-gaap_GainLossOnInvestments | $ 1.2 us-gaap_GainLossOnInvestments | $ 25.9 us-gaap_GainLossOnInvestments | $ 6.3 us-gaap_GainLossOnInvestments | $ 9.3 us-gaap_GainLossOnInvestments | $ (26.1)us-gaap_GainLossOnInvestments | $ 13.3 us-gaap_GainLossOnInvestments | $ 10.3 us-gaap_GainLossOnInvestments | $ 16.1 us-gaap_GainLossOnInvestments | $ 6.8 us-gaap_GainLossOnInvestments | $ 56.2 us-gaap_GainLossOnInvestments
Total Revenue | 2,635.7 us-gaap_Revenues | 2,609.4 us-gaap_Revenues | 2,653.5 us-gaap_Revenues | 2,611.1 us-gaap_Revenues | 2,586.2 us-gaap_Revenues | 2,540.9 us-gaap_Revenues | 2,601.9 us-gaap_Revenues | 2,624.8 us-gaap_Revenues | 10,509.7 us-gaap_Revenues | 10,353.8 us-gaap_Revenues | 10,515.4 us-gaap_Revenues
Net Realized Investment Gain | (17.3)us-gaap_GainLossOnInvestments | 1.2 us-gaap_GainLossOnInvestments | 25.9 us-gaap_GainLossOnInvestments | 6.3 us-gaap_GainLossOnInvestments | 9.3 us-gaap_GainLossOnInvestments | (26.1)us-gaap_GainLossOnInvestments | 13.3 us-gaap_GainLossOnInvestments | 10.3 us-gaap_GainLossOnInvestments | 16.1 us-gaap_GainLossOnInvestments | 6.8 us-gaap_GainLossOnInvestments | 56.2 us-gaap_GainLossOnInvestments
Reserve Increase for Long-term Care | (698.2)unm_ReserveIncreaseforLongtermCareBeforeTax |  |  |  |  |  |  |  | (698.2)unm_ReserveIncreaseforLongtermCareBeforeTax |  |
Unclaimed Death Benefit Reserve Increase (Decrease) Before Taxes |  |  |  |  | (95.5)unm_UnclaimedDeathBenefitReserveIncreaseDecreaseBeforeTaxes |  |  |  |  | (95.5)unm_UnclaimedDeathBenefitReserveIncreaseDecreaseBeforeTaxes |
Waiver of Premium Benefit Reserve Increase (Decrease) Before Tax |  |  |  |  | 85.0 unm_WaiverofPremiumBenefitReserveIncreaseDecreaseBeforeTax |  |  |  |  |  |
Income Before Income Tax | (457.9)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 312.1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 346.5 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 326.5 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 305.8 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 284.1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 311.5 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 303.8 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 527.2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 1,205.2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 1,249.5 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 10,493.6 unm_OperatingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 10,347.0 unm_OperatingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 10,459.2 unm_OperatingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Net Realized Investment Gain |  |  |  |  |  |  |  |  | 16.1 us-gaap_GainLossOnInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 6.8 us-gaap_GainLossOnInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 56.2 us-gaap_GainLossOnInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Total Revenue |  |  |  |  |  |  |  |  | 10,509.7 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 10,353.8 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 10,515.4 us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Operating Income |  |  |  |  |  |  |  |  | 1,292.5 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 1,241.8 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 1,239.7 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Net Realized Investment Gain |  |  |  |  |  |  |  |  | 16.1 us-gaap_GainLossOnInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 6.8 us-gaap_GainLossOnInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 56.2 us-gaap_GainLossOnInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Non-operating Retirement-related Loss |  |  |  |  |  |  |  |  | (70.0)unm_NonOperatingRetirementRelatedLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | (32.9)unm_NonOperatingRetirementRelatedLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | (46.4)unm_NonOperatingRetirementRelatedLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Make-whole Premium on Early Repayment of Debt |  |  |  |  |  |  |  |  | 13.2 unm_MakewholePremiumonEarlyRepaymentofDebt / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 0 unm_MakewholePremiumonEarlyRepaymentofDebt / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 0 unm_MakewholePremiumonEarlyRepaymentofDebt / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Reserve Increase for Long-term Care |  |  |  |  |  |  |  |  | (698.2)unm_ReserveIncreaseforLongtermCareBeforeTax / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 0 unm_ReserveIncreaseforLongtermCareBeforeTax / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 0 unm_ReserveIncreaseforLongtermCareBeforeTax / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Waiver of Premium Benefit Reserve Increase (Decrease) Before Tax |  |  |  |  |  |  |  |  | 0 unm_WaiverofPremiumBenefitReserveIncreaseDecreaseBeforeTax / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 85.0 unm_WaiverofPremiumBenefitReserveIncreaseDecreaseBeforeTax / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 0 unm_WaiverofPremiumBenefitReserveIncreaseDecreaseBeforeTax / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Income Before Income Tax |  |  |  |  |  |  |  |  | 527.2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 1,205.2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 1,249.5 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Unum U.S. |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item |  |  |  |  |  |  |  |  |  |  |
Unclaimed Death Benefit Reserve Increase (Decrease) Before Taxes |  |  |  |  |  |  |  |  |  | (75.4)unm_UnclaimedDeathBenefitReserveIncreaseDecreaseBeforeTaxes / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember |
Waiver of Premium Benefit Reserve Increase (Decrease) Before Tax |  |  |  |  |  |  |  |  |  | (85.0)unm_WaiverofPremiumBenefitReserveIncreaseDecreaseBeforeTax / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember |
Unum U.S. | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 5,672.1 unm_OperatingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember | 5,575.0 unm_OperatingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember | 5,533.4 unm_OperatingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember
Operating Income |  |  |  |  |  |  |  |  | 856.3 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember | 859.0 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember | 847.1 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember
Unclaimed Death Benefit Reserve Increase (Decrease) Before Taxes |  |  |  |  |  |  |  |  | 0 unm_UnclaimedDeathBenefitReserveIncreaseDecreaseBeforeTaxes / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember | (75.4)unm_UnclaimedDeathBenefitReserveIncreaseDecreaseBeforeTaxes / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember | 0 unm_UnclaimedDeathBenefitReserveIncreaseDecreaseBeforeTaxes / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_UnumUsMember
Colonial Life |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item |  |  |  |  |  |  |  |  |  |  |
Unclaimed Death Benefit Reserve Increase (Decrease) Before Taxes |  |  |  |  |  |  |  |  |  | (20.1)unm_UnclaimedDeathBenefitReserveIncreaseDecreaseBeforeTaxes / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember |
Colonial Life | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item |  |  |  |  |  |  |  |  |  |  |
Operating Revenue |  |  |  |  |  |  |  |  | 1,420.5 unm_OperatingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember | 1,377.8 unm_OperatingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember | 1,333.4 unm_OperatingRevenue / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember
Operating Income |  |  |  |  |  |  |  |  | 300.2 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember | 284.9 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember | 274.3 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember
Unclaimed Death Benefit Reserve Increase (Decrease) Before Taxes |  |  |  |  |  |  |  |  | $ 0 unm_UnclaimedDeathBenefitReserveIncreaseDecreaseBeforeTaxes / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember | $ (20.1)unm_UnclaimedDeathBenefitReserveIncreaseDecreaseBeforeTaxes / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember | $ 0 unm_UnclaimedDeathBenefitReserveIncreaseDecreaseBeforeTaxes / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = unm_ColonialLifeMember

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