10-Q 1 unm-20210930.htm 10-Q unm-20210930
00000055132021Q3FALSE--12-3100000055132021-01-012021-09-300000005513us-gaap:CommonClassAMemberexch:XNYS2021-01-012021-09-300000005513unm:A6250JuniorSubordinatedNotesDue2058Memberexch:XNYS2021-01-012021-09-30xbrli:shares00000055132021-11-01iso4217:USD00000055132021-09-3000000055132020-12-31iso4217:USDxbrli:shares00000055132021-07-012021-09-3000000055132020-07-012020-09-3000000055132020-01-012020-09-300000005513us-gaap:CommonStockMember2021-06-300000005513us-gaap:CommonStockMember2020-06-300000005513us-gaap:CommonStockMember2020-12-310000005513us-gaap:CommonStockMember2019-12-310000005513us-gaap:CommonStockMember2021-07-012021-09-300000005513us-gaap:CommonStockMember2020-07-012020-09-300000005513us-gaap:CommonStockMember2021-01-012021-09-300000005513us-gaap:CommonStockMember2020-01-012020-09-300000005513us-gaap:CommonStockMember2021-09-300000005513us-gaap:CommonStockMember2020-09-300000005513us-gaap:AdditionalPaidInCapitalMember2021-06-300000005513us-gaap:AdditionalPaidInCapitalMember2020-06-300000005513us-gaap:AdditionalPaidInCapitalMember2020-12-310000005513us-gaap:AdditionalPaidInCapitalMember2019-12-310000005513us-gaap:AdditionalPaidInCapitalMember2021-07-012021-09-300000005513us-gaap:AdditionalPaidInCapitalMember2020-07-012020-09-300000005513us-gaap:AdditionalPaidInCapitalMember2021-01-012021-09-300000005513us-gaap:AdditionalPaidInCapitalMember2020-01-012020-09-300000005513us-gaap:AdditionalPaidInCapitalMember2021-09-300000005513us-gaap:AdditionalPaidInCapitalMember2020-09-300000005513us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-06-300000005513us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-06-300000005513us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-12-310000005513us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-12-310000005513us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-07-012021-09-300000005513us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-07-012020-09-300000005513us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-01-012021-09-300000005513us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-01-012020-09-300000005513us-gaap:AccumulatedOtherComprehensiveIncomeMember2021-09-300000005513us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-09-300000005513us-gaap:RetainedEarningsMember2021-06-300000005513us-gaap:RetainedEarningsMember2020-06-300000005513us-gaap:RetainedEarningsMember2020-12-310000005513us-gaap:RetainedEarningsMember2019-12-310000005513us-gaap:AccountingStandardsUpdate201613Membersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberus-gaap:RetainedEarningsMember2021-06-300000005513us-gaap:AccountingStandardsUpdate201613Membersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberus-gaap:RetainedEarningsMember2020-06-300000005513us-gaap:AccountingStandardsUpdate201613Membersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberus-gaap:RetainedEarningsMember2020-12-310000005513us-gaap:AccountingStandardsUpdate201613Membersrt:CumulativeEffectPeriodOfAdoptionAdjustmentMemberus-gaap:RetainedEarningsMember2019-12-310000005513srt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMemberus-gaap:AccountingStandardsUpdate201613Memberus-gaap:RetainedEarningsMember2021-06-300000005513srt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMemberus-gaap:AccountingStandardsUpdate201613Memberus-gaap:RetainedEarningsMember2020-06-300000005513srt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMemberus-gaap:AccountingStandardsUpdate201613Memberus-gaap:RetainedEarningsMember2020-12-310000005513srt:CumulativeEffectPeriodOfAdoptionAdjustedBalanceMemberus-gaap:AccountingStandardsUpdate201613Memberus-gaap:RetainedEarningsMember2019-12-310000005513us-gaap:RetainedEarningsMember2021-07-012021-09-300000005513us-gaap:RetainedEarningsMember2020-07-012020-09-300000005513us-gaap:RetainedEarningsMember2021-01-012021-09-300000005513us-gaap:RetainedEarningsMember2020-01-012020-09-300000005513us-gaap:RetainedEarningsMember2021-09-300000005513us-gaap:RetainedEarningsMember2020-09-300000005513us-gaap:TreasuryStockMember2021-06-300000005513us-gaap:TreasuryStockMember2020-06-300000005513us-gaap:TreasuryStockMember2020-12-310000005513us-gaap:TreasuryStockMember2019-12-3100000055132020-09-3000000055132019-12-310000005513us-gaap:AccountingStandardsUpdate201613Membersrt:RestatementAdjustmentMember2020-01-01xbrli:pure0000005513us-gaap:FairValueInputsLevel1Member2021-09-300000005513unm:FairValueInputsOtherThanLevel1Member2021-09-300000005513unm:PricingServiceMemberus-gaap:FairValueInputsLevel2Member2021-09-300000005513unm:OtherObservableMarketDataMemberus-gaap:FairValueInputsLevel2Member2021-09-300000005513unm:FairValueInputsLevel2OrLevel3Member2021-09-300000005513us-gaap:PrivateEquityFundsMemberunm:NotRedeemableMemberunm:PrivateCreditMember2021-09-300000005513unm:Quarterlyafter2yearlockwith90daysnoticeMemberus-gaap:PrivateEquityFundsMemberunm:PrivateCreditMember2021-09-300000005513us-gaap:PrivateEquityFundsMemberunm:PrivateCreditMember2021-09-300000005513unm:PrivateEquityLimitedPartnershipMemberus-gaap:PrivateEquityFundsMemberunm:NotRedeemableMember2021-09-300000005513unm:PrivateEquityLimitedPartnershipMemberus-gaap:PrivateEquityFundsMemberunm:QuarterlyAfter55YearLockWith90DaysNoticeMember2021-09-300000005513unm:PrivateEquityLimitedPartnershipMemberus-gaap:PrivateEquityFundsMember2021-09-300000005513us-gaap:PrivateEquityFundsMemberunm:NotRedeemableMemberunm:RealAssetsMember2021-09-300000005513us-gaap:PrivateEquityFundsMemberunm:RealAssetsMemberunm:QuarterlyMember2021-09-300000005513us-gaap:PrivateEquityFundsMemberunm:RealAssetsMember2021-09-300000005513us-gaap:PrivateEquityFundsMember2021-09-300000005513us-gaap:PrivateEquityFundsMemberunm:NotRedeemableMemberunm:PrivateCreditMember2020-12-310000005513unm:Quarterlyafter2yearlockwith90daysnoticeMemberus-gaap:PrivateEquityFundsMemberunm:PrivateCreditMember2020-12-310000005513us-gaap:PrivateEquityFundsMemberunm:PrivateCreditMember2020-12-310000005513unm:PrivateEquityLimitedPartnershipMemberus-gaap:PrivateEquityFundsMemberunm:NotRedeemableMember2020-12-310000005513unm:PrivateEquityLimitedPartnershipMemberus-gaap:PrivateEquityFundsMemberunm:QuarterlyAfter55YearLockWith90DaysNoticeMember2020-12-310000005513us-gaap:PrivateEquityFundsMemberunm:NotRedeemableMemberunm:RealAssetsMember2020-12-310000005513us-gaap:PrivateEquityFundsMemberunm:RealAssetsMemberunm:QuarterlyMember2020-12-310000005513us-gaap:PrivateEquityFundsMemberunm:RealAssetsMember2020-12-310000005513us-gaap:PrivateEquityFundsMember2020-12-310000005513us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2021-09-300000005513us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-09-300000005513us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-09-300000005513us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-09-300000005513us-gaap:USTreasuryAndGovernmentMember2021-09-300000005513us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2021-09-300000005513us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-09-300000005513us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-09-300000005513us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-09-300000005513us-gaap:USStatesAndPoliticalSubdivisionsMember2021-09-300000005513us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2021-09-300000005513us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-09-300000005513us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-09-300000005513us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-09-300000005513us-gaap:ForeignGovernmentDebtSecuritiesMember2021-09-300000005513us-gaap:PublicUtilityBondsMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2021-09-300000005513us-gaap:PublicUtilityBondsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-09-300000005513us-gaap:PublicUtilityBondsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-09-300000005513us-gaap:PublicUtilityBondsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-09-300000005513us-gaap:PublicUtilityBondsMember2021-09-300000005513us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2021-09-300000005513us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-09-300000005513us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-09-300000005513us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-09-300000005513us-gaap:AssetBackedSecuritiesMember2021-09-300000005513us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2021-09-300000005513us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-09-300000005513us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-09-300000005513us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-09-300000005513us-gaap:CorporateDebtSecuritiesMember2021-09-300000005513us-gaap:RedeemablePreferredStockMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2021-09-300000005513us-gaap:RedeemablePreferredStockMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-09-300000005513us-gaap:RedeemablePreferredStockMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-09-300000005513us-gaap:RedeemablePreferredStockMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-09-300000005513us-gaap:RedeemablePreferredStockMember2021-09-300000005513us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2021-09-300000005513us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-09-300000005513us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-09-300000005513us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-09-300000005513us-gaap:CurrencySwapMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2021-09-300000005513us-gaap:CurrencySwapMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-09-300000005513us-gaap:CurrencySwapMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-09-300000005513us-gaap:CurrencySwapMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-09-300000005513us-gaap:CurrencySwapMember2021-09-300000005513us-gaap:PrivateEquityFundsMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2021-09-300000005513us-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-09-300000005513us-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-09-300000005513us-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-09-300000005513us-gaap:FairValueMeasurementsRecurringMember2021-09-300000005513us-gaap:CurrencySwapMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2021-09-300000005513us-gaap:CurrencySwapMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-09-300000005513us-gaap:CurrencySwapMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-09-300000005513us-gaap:CurrencySwapMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-09-300000005513us-gaap:CurrencySwapMember2021-09-300000005513us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EmbeddedDerivativeFinancialInstrumentsMember2021-09-300000005513us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EmbeddedDerivativeFinancialInstrumentsMember2021-09-300000005513us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EmbeddedDerivativeFinancialInstrumentsMember2021-09-300000005513us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:EmbeddedDerivativeFinancialInstrumentsMember2021-09-300000005513us-gaap:EmbeddedDerivativeFinancialInstrumentsMember2021-09-300000005513us-gaap:DerivativeMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2021-09-300000005513us-gaap:DerivativeMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2021-09-300000005513us-gaap:DerivativeMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2021-09-300000005513us-gaap:DerivativeMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2021-09-300000005513us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000005513us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000005513us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000005513us-gaap:USTreasuryAndGovernmentMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2020-12-310000005513us-gaap:USTreasuryAndGovernmentMember2020-12-310000005513us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000005513us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000005513us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000005513us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2020-12-310000005513us-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310000005513us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000005513us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000005513us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000005513us-gaap:ForeignGovernmentDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2020-12-310000005513us-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310000005513us-gaap:PublicUtilityBondsMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000005513us-gaap:PublicUtilityBondsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000005513us-gaap:PublicUtilityBondsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000005513us-gaap:PublicUtilityBondsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2020-12-310000005513us-gaap:PublicUtilityBondsMember2020-12-310000005513us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000005513us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000005513us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000005513us-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2020-12-310000005513us-gaap:AssetBackedSecuritiesMember2020-12-310000005513us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000005513us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000005513us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000005513us-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2020-12-310000005513us-gaap:CorporateDebtSecuritiesMember2020-12-310000005513us-gaap:RedeemablePreferredStockMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000005513us-gaap:RedeemablePreferredStockMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000005513us-gaap:RedeemablePreferredStockMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000005513us-gaap:RedeemablePreferredStockMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2020-12-310000005513us-gaap:RedeemablePreferredStockMember2020-12-310000005513us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000005513us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000005513us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000005513us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2020-12-310000005513us-gaap:CurrencySwapMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000005513us-gaap:CurrencySwapMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000005513us-gaap:CurrencySwapMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000005513us-gaap:CurrencySwapMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2020-12-310000005513us-gaap:CurrencySwapMember2020-12-310000005513us-gaap:CreditDefaultSwapMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000005513us-gaap:CreditDefaultSwapMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000005513us-gaap:CreditDefaultSwapMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000005513us-gaap:CreditDefaultSwapMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2020-12-310000005513us-gaap:CreditDefaultSwapMember2020-12-310000005513us-gaap:PrivateEquityFundsMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000005513us-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000005513us-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000005513us-gaap:PrivateEquityFundsMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2020-12-310000005513us-gaap:FairValueMeasurementsRecurringMember2020-12-310000005513us-gaap:CurrencySwapMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000005513us-gaap:CurrencySwapMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000005513us-gaap:CurrencySwapMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000005513us-gaap:CurrencySwapMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2020-12-310000005513us-gaap:CurrencySwapMember2020-12-310000005513us-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:EmbeddedDerivativeFinancialInstrumentsMember2020-12-310000005513us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Memberus-gaap:EmbeddedDerivativeFinancialInstrumentsMember2020-12-310000005513us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:EmbeddedDerivativeFinancialInstrumentsMember2020-12-310000005513us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMemberus-gaap:EmbeddedDerivativeFinancialInstrumentsMember2020-12-310000005513us-gaap:EmbeddedDerivativeFinancialInstrumentsMember2020-12-310000005513us-gaap:DerivativeMemberus-gaap:FairValueInputsLevel1Memberus-gaap:FairValueMeasurementsRecurringMember2020-12-310000005513us-gaap:DerivativeMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000005513us-gaap:DerivativeMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000005513us-gaap:DerivativeMemberus-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueMeasuredAtNetAssetValuePerShareMember2020-12-310000005513us-gaap:ForeignGovernmentDebtSecuritiesMember2021-06-300000005513us-gaap:ForeignGovernmentDebtSecuritiesMember2021-07-012021-09-300000005513us-gaap:ForeignGovernmentDebtSecuritiesMember2021-09-300000005513us-gaap:PublicUtilityBondsMember2021-06-300000005513us-gaap:PublicUtilityBondsMember2021-07-012021-09-300000005513us-gaap:PublicUtilityBondsMember2021-09-300000005513us-gaap:AssetBackedSecuritiesMember2021-06-300000005513us-gaap:AssetBackedSecuritiesMember2021-07-012021-09-300000005513us-gaap:AssetBackedSecuritiesMember2021-09-300000005513us-gaap:CorporateDebtSecuritiesMember2021-06-300000005513us-gaap:CorporateDebtSecuritiesMember2021-07-012021-09-300000005513us-gaap:CorporateDebtSecuritiesMember2021-09-300000005513us-gaap:DebtSecuritiesMember2021-06-300000005513us-gaap:DebtSecuritiesMember2021-07-012021-09-300000005513us-gaap:DebtSecuritiesMember2021-09-300000005513us-gaap:EquitySecuritiesMember2021-06-300000005513us-gaap:EquitySecuritiesMember2021-07-012021-09-300000005513us-gaap:EquitySecuritiesMember2021-09-300000005513us-gaap:EmbeddedDerivativeFinancialInstrumentsMember2021-06-300000005513us-gaap:EmbeddedDerivativeFinancialInstrumentsMember2021-07-012021-09-300000005513us-gaap:USStatesAndPoliticalSubdivisionsMember2020-06-300000005513us-gaap:USStatesAndPoliticalSubdivisionsMember2020-07-012020-09-300000005513us-gaap:USStatesAndPoliticalSubdivisionsMember2020-09-300000005513us-gaap:ForeignGovernmentDebtSecuritiesMember2020-06-300000005513us-gaap:ForeignGovernmentDebtSecuritiesMember2020-07-012020-09-300000005513us-gaap:ForeignGovernmentDebtSecuritiesMember2020-09-300000005513us-gaap:PublicUtilityBondsMember2020-06-300000005513us-gaap:PublicUtilityBondsMember2020-07-012020-09-300000005513us-gaap:PublicUtilityBondsMember2020-09-300000005513us-gaap:AssetBackedSecuritiesMember2020-06-300000005513us-gaap:AssetBackedSecuritiesMember2020-07-012020-09-300000005513us-gaap:AssetBackedSecuritiesMember2020-09-300000005513us-gaap:CorporateDebtSecuritiesMember2020-06-300000005513us-gaap:CorporateDebtSecuritiesMember2020-07-012020-09-300000005513us-gaap:CorporateDebtSecuritiesMember2020-09-300000005513us-gaap:DebtSecuritiesMember2020-06-300000005513us-gaap:DebtSecuritiesMember2020-07-012020-09-300000005513us-gaap:DebtSecuritiesMember2020-09-300000005513us-gaap:EquitySecuritiesMember2020-06-300000005513us-gaap:EquitySecuritiesMember2020-07-012020-09-300000005513us-gaap:EquitySecuritiesMember2020-09-300000005513us-gaap:EmbeddedDerivativeFinancialInstrumentsMember2020-06-300000005513us-gaap:EmbeddedDerivativeFinancialInstrumentsMember2020-07-012020-09-300000005513us-gaap:EmbeddedDerivativeFinancialInstrumentsMember2020-09-300000005513us-gaap:USStatesAndPoliticalSubdivisionsMember2020-12-310000005513us-gaap:USStatesAndPoliticalSubdivisionsMember2021-01-012021-09-300000005513us-gaap:USStatesAndPoliticalSubdivisionsMember2021-09-300000005513us-gaap:ForeignGovernmentDebtSecuritiesMember2020-12-310000005513us-gaap:ForeignGovernmentDebtSecuritiesMember2021-01-012021-09-300000005513us-gaap:PublicUtilityBondsMember2020-12-310000005513us-gaap:PublicUtilityBondsMember2021-01-012021-09-300000005513us-gaap:AssetBackedSecuritiesMember2020-12-310000005513us-gaap:AssetBackedSecuritiesMember2021-01-012021-09-300000005513us-gaap:CorporateDebtSecuritiesMember2020-12-310000005513us-gaap:CorporateDebtSecuritiesMember2021-01-012021-09-300000005513us-gaap:DebtSecuritiesMember2020-12-310000005513us-gaap:DebtSecuritiesMember2021-01-012021-09-300000005513us-gaap:EquitySecuritiesMember2020-12-310000005513us-gaap:EquitySecuritiesMember2021-01-012021-09-300000005513us-gaap:EmbeddedDerivativeFinancialInstrumentsMember2021-01-012021-09-300000005513us-gaap:USStatesAndPoliticalSubdivisionsMember2019-12-310000005513us-gaap:USStatesAndPoliticalSubdivisionsMember2020-01-012020-09-300000005513us-gaap:ForeignGovernmentDebtSecuritiesMember2019-12-310000005513us-gaap:ForeignGovernmentDebtSecuritiesMember2020-01-012020-09-300000005513us-gaap:PublicUtilityBondsMember2019-12-310000005513us-gaap:PublicUtilityBondsMember2020-01-012020-09-300000005513us-gaap:AssetBackedSecuritiesMember2019-12-310000005513us-gaap:AssetBackedSecuritiesMember2020-01-012020-09-300000005513us-gaap:CorporateDebtSecuritiesMember2019-12-310000005513us-gaap:CorporateDebtSecuritiesMember2020-01-012020-09-300000005513us-gaap:DebtSecuritiesMember2019-12-310000005513us-gaap:DebtSecuritiesMember2020-01-012020-09-300000005513us-gaap:EquitySecuritiesMember2019-12-310000005513us-gaap:EquitySecuritiesMember2020-01-012020-09-300000005513us-gaap:EmbeddedDerivativeFinancialInstrumentsMember2019-12-310000005513us-gaap:EmbeddedDerivativeFinancialInstrumentsMember2020-01-012020-09-300000005513us-gaap:MarketApproachValuationTechniqueMemberus-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-09-30utr:Rate0000005513us-gaap:MeasurementInputDiscountForLackOfMarketabilityMembersrt:MinimumMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-09-300000005513us-gaap:MeasurementInputDiscountForLackOfMarketabilityMembersrt:MaximumMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-09-300000005513srt:WeightedAverageMemberus-gaap:MeasurementInputDiscountForLackOfMarketabilityMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-09-300000005513srt:MinimumMemberus-gaap:MeasurementInputEntityCreditRiskMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-09-300000005513us-gaap:MeasurementInputEntityCreditRiskMembersrt:MaximumMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-09-300000005513srt:WeightedAverageMemberus-gaap:MeasurementInputEntityCreditRiskMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2021-09-300000005513us-gaap:EquitySecuritiesMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueInputsLevel3Member2021-09-300000005513us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMember2021-09-300000005513unm:InputMeasurementSpreadOfSwapCurveMembersrt:WeightedAverageMemberus-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMember2021-09-300000005513us-gaap:MarketApproachValuationTechniqueMemberus-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000005513srt:MinimumMemberus-gaap:MeasurementInputEntityCreditRiskMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000005513us-gaap:MeasurementInputEntityCreditRiskMembersrt:MaximumMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000005513srt:WeightedAverageMemberus-gaap:MeasurementInputEntityCreditRiskMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:CorporateDebtSecuritiesMemberus-gaap:FairValueInputsLevel3Member2020-12-310000005513us-gaap:EquitySecuritiesMemberus-gaap:MarketApproachValuationTechniqueMemberus-gaap:FairValueInputsLevel3Member2020-12-310000005513us-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMember2020-12-310000005513unm:InputMeasurementSpreadOfSwapCurveMembersrt:WeightedAverageMemberus-gaap:DerivativeFinancialInstrumentsLiabilitiesMemberus-gaap:FairValueInputsLevel3Memberus-gaap:ValuationTechniqueDiscountedCashFlowMember2020-12-310000005513us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel1Member2021-09-300000005513us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel2Member2021-09-300000005513us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel3Member2021-09-300000005513us-gaap:FairValueMeasurementsNonrecurringMember2021-09-300000005513us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel1Member2020-12-310000005513us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel2Member2020-12-310000005513us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel3Member2020-12-310000005513us-gaap:FairValueMeasurementsNonrecurringMember2020-12-310000005513us-gaap:AllOtherCorporateBondsMember2021-09-300000005513us-gaap:DebtSecuritiesMember2021-09-300000005513us-gaap:AllOtherCorporateBondsMember2020-12-310000005513us-gaap:DebtSecuritiesMember2020-12-310000005513unm:AvailableForSaleSecuritiesUnrealizedGainPositionFairValueMember2021-09-300000005513unm:AvailableForSaleSecuritiesUnrealizedLossPositionFairValueMember2021-09-300000005513unm:AvailableForSaleSecuritiesUnrealizedGainPositionFairValueMember2020-12-310000005513unm:AvailableForSaleSecuritiesUnrealizedLossPositionFairValueMember2020-12-310000005513us-gaap:ExternalCreditRatingInvestmentGradeMember2021-09-300000005513us-gaap:ExternalCreditRatingNonInvestmentGradeMember2021-09-300000005513us-gaap:AllOtherCorporateBondsMember2021-06-300000005513us-gaap:AllOtherCorporateBondsMember2020-06-300000005513us-gaap:AllOtherCorporateBondsMember2021-07-012021-09-300000005513us-gaap:AllOtherCorporateBondsMember2020-07-012020-09-300000005513us-gaap:AllOtherCorporateBondsMember2020-09-300000005513us-gaap:AllOtherCorporateBondsMember2020-01-010000005513us-gaap:AllOtherCorporateBondsMember2021-01-012021-09-300000005513us-gaap:AllOtherCorporateBondsMember2020-01-012020-09-300000005513us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2021-09-300000005513us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberunm:TaxCreditPartnershipMember2021-09-300000005513us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:EquityMethodInvestmentsMember2021-09-300000005513us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember2020-12-310000005513us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberunm:TaxCreditPartnershipMember2020-12-310000005513us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap:EquityMethodInvestmentsMember2020-12-310000005513us-gaap:CommercialRealEstateMember2021-09-300000005513us-gaap:CommercialRealEstateMember2020-12-310000005513srt:ApartmentBuildingMember2021-09-300000005513srt:ApartmentBuildingMember2020-12-310000005513srt:IndustrialPropertyMember2021-09-300000005513srt:IndustrialPropertyMember2020-12-310000005513srt:OfficeBuildingMember2021-09-300000005513srt:OfficeBuildingMember2020-12-310000005513srt:RetailSiteMember2021-09-300000005513srt:RetailSiteMember2020-12-310000005513srt:OtherPropertyMember2021-09-300000005513srt:OtherPropertyMember2020-12-310000005513unm:TotalMember2021-09-300000005513unm:TotalMember2020-12-310000005513unm:NewEnglandMember2021-09-300000005513unm:NewEnglandMember2020-12-310000005513unm:MiddleAtlanticMember2021-09-300000005513unm:MiddleAtlanticMember2020-12-310000005513unm:EastNorthCentralMember2021-09-300000005513unm:EastNorthCentralMember2020-12-310000005513unm:WestNorthCentralMember2021-09-300000005513unm:WestNorthCentralMember2020-12-310000005513unm:SouthAtlanticMember2021-09-300000005513unm:SouthAtlanticMember2020-12-310000005513unm:EastSouthCentralMember2021-09-300000005513unm:EastSouthCentralMember2020-12-310000005513unm:WestSouthCentralMember2021-09-300000005513unm:WestSouthCentralMember2020-12-310000005513unm:MountainMember2021-09-300000005513unm:MountainMember2020-12-310000005513unm:PacificMember2021-09-300000005513unm:PacificMember2020-12-310000005513unm:TotalMember2021-09-300000005513unm:TotalMember2020-12-310000005513unm:AACreditRatingMember2021-09-300000005513unm:AACreditRatingMember2020-12-310000005513unm:CreditRatingMember2021-09-300000005513unm:CreditRatingMember2020-12-310000005513unm:BBBCreditRatingMember2021-09-300000005513unm:BBBCreditRatingMember2020-12-310000005513unm:BBCreditRatingMember2021-09-300000005513unm:BBCreditRatingMember2020-12-310000005513unm:BCreditRatingMember2021-09-300000005513unm:BCreditRatingMember2020-12-310000005513unm:TotalMember2021-09-300000005513unm:TotalMember2020-12-310000005513unm:LoanToValueRatioBelowOrEqualTo65PercentMember2021-09-300000005513unm:LoanToValueRatioBelowOrEqualTo65PercentMember2020-12-310000005513unm:LoanToValueRatioAbove65To75PercentMember2021-09-300000005513unm:LoanToValueRatioAbove65To75PercentMember2020-12-310000005513unm:LoanToValueRatioAbove75To85PercentMember2021-09-300000005513unm:LoanToValueRatioAbove75To85PercentMember2020-12-310000005513unm:LoanToValueRatioAbove85PercentMember2021-09-300000005513unm:LoanToValueRatioAbove85PercentMember2020-12-310000005513unm:TotalMember2021-09-300000005513unm:TotalMember2020-12-310000005513us-gaap:CommercialRealEstateMemberunm:AACreditRatingMember2021-09-300000005513unm:CreditRatingMemberus-gaap:CommercialRealEstateMember2021-09-300000005513us-gaap:CommercialRealEstateMemberunm:BBBCreditRatingMember2021-09-300000005513us-gaap:CommercialRealEstateMemberunm:BBCreditRatingMember2021-09-300000005513us-gaap:CommercialRealEstateMemberunm:BCreditRatingMember2021-09-300000005513unm:OriginatedFiveOrMoreYearsBeforeLastFiscalYearMemberus-gaap:CommercialRealEstateMember2021-09-300000005513unm:OriginatedFourYearsBeforeLastFiscalYearMemberus-gaap:CommercialRealEstateMember2021-09-300000005513us-gaap:CommercialRealEstateMemberunm:OriginatedThreeYearsBeforeLastFiscalYearMember2021-09-300000005513unm:OriginatedTwoYearsBeforeLastFiscalYearMemberus-gaap:CommercialRealEstateMember2021-09-300000005513unm:OriginatedInFiscalYearBeforeLatestFiscalYearMemberus-gaap:CommercialRealEstateMember2021-09-300000005513us-gaap:CommercialRealEstateMemberunm:OriginatedInCurrentFiscalYearMember2021-09-300000005513unm:OriginatedFiveOrMoreYearsBeforeLastFiscalYearMember2021-09-300000005513unm:OriginatedFourYearsBeforeLastFiscalYearMember2021-09-300000005513unm:OriginatedThreeYearsBeforeLastFiscalYearMember2021-09-300000005513unm:OriginatedTwoYearsBeforeLastFiscalYearMember2021-09-300000005513unm:OriginatedInFiscalYearBeforeLatestFiscalYearMember2021-09-300000005513unm:OriginatedInCurrentFiscalYearMember2021-09-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioBelowOrEqualTo65PercentMember2021-09-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove65To75PercentMember2021-09-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove75To85PercentMember2021-09-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove85PercentMember2021-09-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioBelowOrEqualTo65PercentMember2021-06-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioBelowOrEqualTo65PercentMember2021-07-012021-09-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove65To75PercentMember2021-06-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove65To75PercentMember2021-07-012021-09-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove75To85PercentMember2021-06-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove75To85PercentMember2021-07-012021-09-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove85PercentMember2021-06-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove85PercentMember2021-07-012021-09-300000005513unm:LoanToValueRatioTotalMemberus-gaap:CommercialRealEstateMember2021-06-300000005513unm:LoanToValueRatioTotalMemberus-gaap:CommercialRealEstateMember2021-07-012021-09-300000005513unm:LoanToValueRatioTotalMemberus-gaap:CommercialRealEstateMember2021-09-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioBelowOrEqualTo65PercentMember2020-06-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioBelowOrEqualTo65PercentMember2020-07-012020-09-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioBelowOrEqualTo65PercentMember2020-09-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove65To75PercentMember2020-06-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove65To75PercentMember2020-07-012020-09-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove65To75PercentMember2020-09-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove75To85PercentMember2020-06-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove75To85PercentMember2020-07-012020-09-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove75To85PercentMember2020-09-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove85PercentMember2020-06-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove85PercentMember2020-07-012020-09-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove85PercentMember2020-09-300000005513unm:LoanToValueRatioTotalMemberus-gaap:CommercialRealEstateMember2020-06-300000005513unm:LoanToValueRatioTotalMemberus-gaap:CommercialRealEstateMember2020-07-012020-09-300000005513unm:LoanToValueRatioTotalMemberus-gaap:CommercialRealEstateMember2020-09-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioBelowOrEqualTo65PercentMember2020-12-310000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioBelowOrEqualTo65PercentMember2021-01-012021-09-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove65To75PercentMember2020-12-310000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove65To75PercentMember2021-01-012021-09-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove75To85PercentMember2020-12-310000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove75To85PercentMember2021-01-012021-09-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove85PercentMember2020-12-310000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove85PercentMember2021-01-012021-09-300000005513unm:LoanToValueRatioTotalMemberus-gaap:CommercialRealEstateMember2020-12-310000005513unm:LoanToValueRatioTotalMemberus-gaap:CommercialRealEstateMember2021-01-012021-09-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioBelowOrEqualTo65PercentMember2020-01-010000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioBelowOrEqualTo65PercentMember2020-01-012020-09-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove65To75PercentMember2020-01-010000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove65To75PercentMember2020-01-012020-09-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove75To85PercentMember2020-01-010000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove75To85PercentMember2020-01-012020-09-300000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove85PercentMember2020-01-010000005513us-gaap:CommercialRealEstateMemberunm:LoanToValueRatioAbove85PercentMember2020-01-012020-09-300000005513unm:LoanToValueRatioTotalMemberus-gaap:CommercialRealEstateMember2020-01-010000005513unm:LoanToValueRatioTotalMemberus-gaap:CommercialRealEstateMember2020-01-012020-09-30unm:Integer0000005513us-gaap:CommercialRealEstateMember2020-07-012020-09-300000005513us-gaap:CommercialRealEstateMember2021-01-012021-09-300000005513us-gaap:CommercialRealEstateMember2021-07-012021-09-300000005513us-gaap:CommercialRealEstateMember2020-01-012020-09-300000005513unm:UnfundedMortgageLoanCommitmentsMember2021-09-300000005513unm:UnfundedMortgageLoanCommitmentsMember2020-12-310000005513unm:OffBalanceSheetAmountMember2021-09-300000005513unm:OffBalanceSheetAmountMember2020-12-310000005513us-gaap:USTreasuryAndGovernmentMemberus-gaap:MaturityOvernightMember2021-09-300000005513us-gaap:USTreasuryAndGovernmentMemberus-gaap:MaturityOvernightMember2020-12-310000005513us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:MaturityOvernightMember2021-09-300000005513us-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:MaturityOvernightMember2020-12-310000005513us-gaap:PublicUtilityBondsMemberus-gaap:MaturityOvernightMember2021-09-300000005513us-gaap:PublicUtilityBondsMemberus-gaap:MaturityOvernightMember2020-12-310000005513us-gaap:AllOtherCorporateBondsMemberus-gaap:MaturityOvernightMember2021-09-300000005513us-gaap:AllOtherCorporateBondsMemberus-gaap:MaturityOvernightMember2020-12-310000005513us-gaap:MaturityOvernightMember2021-09-300000005513us-gaap:MaturityOvernightMember2020-12-310000005513us-gaap:MortgageBackedSecuritiesMember2021-09-300000005513us-gaap:MortgageBackedSecuritiesMember2020-12-310000005513us-gaap:OverTheCounterMember2021-09-300000005513us-gaap:OverTheCounterMember2020-12-310000005513us-gaap:DebtSecuritiesMember2021-07-012021-09-300000005513us-gaap:DebtSecuritiesMember2020-07-012020-09-300000005513us-gaap:DebtSecuritiesMember2021-01-012021-09-300000005513us-gaap:DebtSecuritiesMember2020-01-012020-09-300000005513us-gaap:DerivativeMember2021-07-012021-09-300000005513us-gaap:DerivativeMember2020-07-012020-09-300000005513us-gaap:DerivativeMember2021-01-012021-09-300000005513us-gaap:DerivativeMember2020-01-012020-09-300000005513us-gaap:MortgageReceivablesMember2021-07-012021-09-300000005513us-gaap:MortgageReceivablesMember2020-07-012020-09-300000005513us-gaap:MortgageReceivablesMember2021-01-012021-09-300000005513us-gaap:MortgageReceivablesMember2020-01-012020-09-300000005513us-gaap:PolicyLoansMember2021-07-012021-09-300000005513us-gaap:PolicyLoansMember2020-07-012020-09-300000005513us-gaap:PolicyLoansMember2021-01-012021-09-300000005513us-gaap:PolicyLoansMember2020-01-012020-09-300000005513us-gaap:EquitySecuritiesMember2021-07-012021-09-300000005513us-gaap:EquitySecuritiesMember2020-07-012020-09-300000005513us-gaap:EquitySecuritiesMember2021-01-012021-09-300000005513us-gaap:EquitySecuritiesMember2020-01-012020-09-300000005513srt:PartnershipInterestMember2021-07-012021-09-300000005513srt:PartnershipInterestMember2020-07-012020-09-300000005513srt:PartnershipInterestMember2021-01-012021-09-300000005513srt:PartnershipInterestMember2020-01-012020-09-300000005513us-gaap:OtherLongTermInvestmentsMember2021-07-012021-09-300000005513us-gaap:OtherLongTermInvestmentsMember2020-07-012020-09-300000005513us-gaap:OtherLongTermInvestmentsMember2021-01-012021-09-300000005513us-gaap:OtherLongTermInvestmentsMember2020-01-012020-09-300000005513us-gaap:ShortTermInvestmentsMember2021-07-012021-09-300000005513us-gaap:ShortTermInvestmentsMember2020-07-012020-09-300000005513us-gaap:ShortTermInvestmentsMember2021-01-012021-09-300000005513us-gaap:ShortTermInvestmentsMember2020-01-012020-09-300000005513unm:CreditExposureMember2021-09-300000005513unm:CreditExposureMember2020-12-310000005513us-gaap:CashMember2021-09-300000005513us-gaap:CashMember2020-12-310000005513us-gaap:AvailableforsaleSecuritiesMember2021-09-300000005513us-gaap:AvailableforsaleSecuritiesMember2020-12-310000005513unm:DerivativeFinancialInstrumentsReceiveFixedPayFixedMemberus-gaap:InterestRateSwapMember2020-06-300000005513us-gaap:InterestRateSwapMemberunm:DerivativeFinancialInstrumentsReceiveFixedPayVariableMember2020-06-300000005513us-gaap:CreditDefaultSwapMemberus-gaap:CreditRiskContractMember2020-06-300000005513us-gaap:TotalReturnSwapMemberus-gaap:EquityContractMember2020-06-300000005513us-gaap:ForwardContractsMember2020-06-3000000055132020-06-300000005513unm:DerivativeFinancialInstrumentsReceiveFixedPayFixedMemberus-gaap:InterestRateSwapMember2020-07-012020-09-300000005513us-gaap:InterestRateSwapMemberunm:DerivativeFinancialInstrumentsReceiveFixedPayVariableMember2020-07-012020-09-300000005513us-gaap:CreditDefaultSwapMemberus-gaap:CreditRiskContractMember2020-07-012020-09-300000005513us-gaap:TotalReturnSwapMemberus-gaap:EquityContractMember2020-07-012020-09-300000005513us-gaap:ForwardContractsMember2020-07-012020-09-300000005513unm:DerivativeFinancialInstrumentsReceiveFixedPayFixedMemberus-gaap:InterestRateSwapMember2020-09-300000005513us-gaap:InterestRateSwapMemberunm:DerivativeFinancialInstrumentsReceiveFixedPayVariableMember2020-09-300000005513us-gaap:CreditDefaultSwapMemberus-gaap:CreditRiskContractMember2020-09-300000005513us-gaap:TotalReturnSwapMemberus-gaap:EquityContractMember2020-09-300000005513us-gaap:ForwardContractsMember2020-09-300000005513unm:DerivativeFinancialInstrumentsReceiveFixedPayFixedMemberus-gaap:InterestRateSwapMember2019-12-310000005513us-gaap:InterestRateSwapMemberunm:DerivativeFinancialInstrumentsReceiveFixedPayVariableMember2019-12-310000005513us-gaap:CreditDefaultSwapMemberus-gaap:CreditRiskContractMember2019-12-310000005513us-gaap:TotalReturnSwapMemberus-gaap:EquityContractMember2019-12-310000005513us-gaap:ForwardContractsMember2019-12-310000005513unm:DerivativeFinancialInstrumentsReceiveFixedPayFixedMemberus-gaap:InterestRateSwapMember2020-01-012020-09-300000005513us-gaap:InterestRateSwapMemberunm:DerivativeFinancialInstrumentsReceiveFixedPayVariableMember2020-01-012020-09-300000005513us-gaap:CreditDefaultSwapMemberus-gaap:CreditRiskContractMember2020-01-012020-09-300000005513us-gaap:TotalReturnSwapMemberus-gaap:EquityContractMember2020-01-012020-09-300000005513us-gaap:ForwardContractsMember2020-01-012020-09-300000005513unm:DerivativeFinancialInstrumentsReceiveFixedPayFixedMemberus-gaap:InterestRateSwapMember2021-06-300000005513us-gaap:InterestRateSwapMemberunm:DerivativeFinancialInstrumentsReceiveFixedPayVariableMember2021-06-300000005513us-gaap:CreditDefaultSwapMemberus-gaap:CreditRiskContractMember2021-06-300000005513us-gaap:TotalReturnSwapMemberus-gaap:EquityContractMember2021-06-300000005513us-gaap:ForwardContractsMember2021-06-3000000055132021-06-300000005513unm:DerivativeFinancialInstrumentsReceiveFixedPayFixedMemberus-gaap:InterestRateSwapMember2021-07-012021-09-300000005513us-gaap:InterestRateSwapMemberunm:DerivativeFinancialInstrumentsReceiveFixedPayVariableMember2021-07-012021-09-300000005513us-gaap:CreditDefaultSwapMemberus-gaap:CreditRiskContractMember2021-07-012021-09-300000005513us-gaap:TotalReturnSwapMemberus-gaap:EquityContractMember2021-07-012021-09-300000005513us-gaap:ForwardContractsMember2021-07-012021-09-300000005513unm:DerivativeFinancialInstrumentsReceiveFixedPayFixedMemberus-gaap:InterestRateSwapMember2021-09-300000005513us-gaap:InterestRateSwapMemberunm:DerivativeFinancialInstrumentsReceiveFixedPayVariableMember2021-09-300000005513us-gaap:CreditDefaultSwapMemberus-gaap:CreditRiskContractMember2021-09-300000005513us-gaap:TotalReturnSwapMemberus-gaap:EquityContractMember2021-09-300000005513us-gaap:ForwardContractsMember2021-09-300000005513unm:DerivativeFinancialInstrumentsReceiveFixedPayFixedMemberus-gaap:InterestRateSwapMember2020-12-310000005513us-gaap:InterestRateSwapMemberunm:DerivativeFinancialInstrumentsReceiveFixedPayVariableMember2020-12-310000005513us-gaap:CreditDefaultSwapMemberus-gaap:CreditRiskContractMember2020-12-310000005513us-gaap:TotalReturnSwapMemberus-gaap:EquityContractMember2020-12-310000005513us-gaap:ForwardContractsMember2020-12-310000005513unm:DerivativeFinancialInstrumentsReceiveFixedPayFixedMemberus-gaap:InterestRateSwapMember2021-01-012021-09-300000005513us-gaap:InterestRateSwapMemberunm:DerivativeFinancialInstrumentsReceiveFixedPayVariableMember2021-01-012021-09-300000005513us-gaap:CreditDefaultSwapMemberus-gaap:CreditRiskContractMember2021-01-012021-09-300000005513us-gaap:TotalReturnSwapMemberus-gaap:EquityContractMember2021-01-012021-09-300000005513us-gaap:ForwardContractsMember2021-01-012021-09-300000005513us-gaap:CashFlowHedgingMemberunm:DerivativeFinancialInstrumentsReceiveFixedPayFixedMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMember2021-09-300000005513us-gaap:CashFlowHedgingMemberunm:DerivativeFinancialInstrumentsReceiveFixedPayFixedMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMember2020-12-310000005513us-gaap:ForwardContractsMemberus-gaap:CashFlowHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-01-012021-09-300000005513us-gaap:FairValueHedgingMemberunm:DerivativeFinancialInstrumentsReceiveFixedPayFixedMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMember2021-09-300000005513us-gaap:FairValueHedgingMemberunm:DerivativeFinancialInstrumentsReceiveFixedPayFixedMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMember2020-12-310000005513us-gaap:FairValueHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMemberunm:DerivativeFinancialInstrumentsReceiveFixedPayVariableMember2019-12-310000005513us-gaap:FairValueHedgingMemberunm:DerivativeFinancialInstrumentsReceiveFixedPayFixedMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:AvailableforsaleSecuritiesMemberus-gaap:InterestRateSwapMember2021-09-300000005513us-gaap:FairValueHedgingMemberunm:DerivativeFinancialInstrumentsReceiveFixedPayFixedMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:AvailableforsaleSecuritiesMemberus-gaap:InterestRateSwapMember2020-12-310000005513us-gaap:NondesignatedMemberunm:DerivativeFinancialInstrumentsReceiveFixedPayFixedMemberus-gaap:InterestRateSwapMember2021-09-300000005513us-gaap:NondesignatedMemberunm:DerivativeFinancialInstrumentsReceiveFixedPayFixedMemberus-gaap:InterestRateSwapMember2020-12-310000005513us-gaap:NondesignatedMemberus-gaap:CreditDefaultSwapMemberus-gaap:CreditRiskContractMember2021-09-300000005513us-gaap:NondesignatedMemberus-gaap:CreditDefaultSwapMemberus-gaap:CreditRiskContractMember2020-12-310000005513us-gaap:NondesignatedMemberus-gaap:ForwardContractsMember2021-09-300000005513us-gaap:NondesignatedMemberus-gaap:ForwardContractsMember2020-12-310000005513us-gaap:NondesignatedMemberus-gaap:TotalReturnSwapMember2021-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:OtherLongTermInvestmentsMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:OtherLiabilitiesMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:OtherLongTermInvestmentsMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:OtherLiabilitiesMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-09-300000005513us-gaap:OtherLongTermInvestmentsMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-09-300000005513us-gaap:OtherLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-09-300000005513us-gaap:NondesignatedMemberus-gaap:OtherLongTermInvestmentsMemberus-gaap:ForeignExchangeContractMember2021-09-300000005513us-gaap:NondesignatedMemberus-gaap:OtherLiabilitiesMemberus-gaap:ForeignExchangeContractMember2021-09-300000005513us-gaap:NondesignatedMemberus-gaap:OtherLongTermInvestmentsMemberus-gaap:EmbeddedDerivativeFinancialInstrumentsMember2021-09-300000005513us-gaap:NondesignatedMemberus-gaap:OtherLiabilitiesMemberus-gaap:EmbeddedDerivativeFinancialInstrumentsMember2021-09-300000005513us-gaap:NondesignatedMemberus-gaap:OtherLongTermInvestmentsMember2021-09-300000005513us-gaap:NondesignatedMemberus-gaap:OtherLiabilitiesMember2021-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:OtherLongTermInvestmentsMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-12-310000005513us-gaap:CashFlowHedgingMemberus-gaap:OtherLiabilitiesMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-12-310000005513us-gaap:FairValueHedgingMemberus-gaap:OtherLongTermInvestmentsMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-12-310000005513us-gaap:FairValueHedgingMemberus-gaap:OtherLiabilitiesMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-12-310000005513us-gaap:OtherLongTermInvestmentsMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-12-310000005513us-gaap:OtherLiabilitiesMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-12-310000005513us-gaap:NondesignatedMemberus-gaap:OtherLongTermInvestmentsMemberus-gaap:CreditRiskContractMember2020-12-310000005513us-gaap:NondesignatedMemberus-gaap:OtherLiabilitiesMemberus-gaap:CreditRiskContractMember2020-12-310000005513us-gaap:NondesignatedMemberus-gaap:OtherLongTermInvestmentsMemberus-gaap:ForeignExchangeContractMember2020-12-310000005513us-gaap:NondesignatedMemberus-gaap:OtherLiabilitiesMemberus-gaap:ForeignExchangeContractMember2020-12-310000005513us-gaap:NondesignatedMemberus-gaap:OtherLongTermInvestmentsMemberus-gaap:EmbeddedDerivativeFinancialInstrumentsMember2020-12-310000005513us-gaap:NondesignatedMemberus-gaap:OtherLiabilitiesMemberus-gaap:EmbeddedDerivativeFinancialInstrumentsMember2020-12-310000005513us-gaap:NondesignatedMemberus-gaap:OtherLongTermInvestmentsMember2020-12-310000005513us-gaap:NondesignatedMemberus-gaap:OtherLiabilitiesMember2020-12-310000005513us-gaap:CashFlowHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMemberus-gaap:InvestmentIncomeMember2021-07-012021-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:GainLossOnInvestmentsMember1us-gaap:InterestRateSwapMember2021-07-012021-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMemberus-gaap:InterestExpenseMember2021-07-012021-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMemberus-gaap:InvestmentIncomeMember2020-07-012020-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:GainLossOnInvestmentsMember1us-gaap:InterestRateSwapMember2020-07-012020-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMemberus-gaap:InterestExpenseMember2020-07-012020-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InvestmentIncomeMember2021-07-012021-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:GainLossOnInvestmentsMember12021-07-012021-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestExpenseMember2021-07-012021-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InvestmentIncomeMember2020-07-012020-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:GainLossOnInvestmentsMember12020-07-012020-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestExpenseMember2020-07-012020-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMemberus-gaap:InvestmentIncomeMember2021-07-012021-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:GainLossOnInvestmentsMember1us-gaap:InterestRateSwapMember2021-07-012021-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMemberus-gaap:InterestExpenseMember2021-07-012021-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMemberus-gaap:InvestmentIncomeMember2020-07-012020-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:GainLossOnInvestmentsMember1us-gaap:InterestRateSwapMember2020-07-012020-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMemberus-gaap:InterestExpenseMember2020-07-012020-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InvestmentIncomeMember2021-07-012021-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:GainLossOnInvestmentsMember12021-07-012021-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestExpenseMember2021-07-012021-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InvestmentIncomeMember2020-07-012020-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:GainLossOnInvestmentsMember12020-07-012020-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestExpenseMember2020-07-012020-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMemberus-gaap:InvestmentIncomeMember2021-01-012021-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:GainLossOnInvestmentsMember1us-gaap:InterestRateSwapMember2021-01-012021-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMemberus-gaap:InterestExpenseMember2021-01-012021-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMemberus-gaap:InvestmentIncomeMember2020-01-012020-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:GainLossOnInvestmentsMember1us-gaap:InterestRateSwapMember2020-01-012020-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMemberus-gaap:InterestExpenseMember2020-01-012020-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InvestmentIncomeMember2021-01-012021-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:GainLossOnInvestmentsMember12021-01-012021-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestExpenseMember2021-01-012021-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InvestmentIncomeMember2020-01-012020-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:GainLossOnInvestmentsMember12020-01-012020-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestExpenseMember2020-01-012020-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMemberus-gaap:InvestmentIncomeMember2021-01-012021-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:GainLossOnInvestmentsMember1us-gaap:InterestRateSwapMember2021-01-012021-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMemberus-gaap:InterestExpenseMember2021-01-012021-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMemberus-gaap:InvestmentIncomeMember2020-01-012020-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:GainLossOnInvestmentsMember1us-gaap:InterestRateSwapMember2020-01-012020-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestRateSwapMemberus-gaap:InterestExpenseMember2020-01-012020-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InvestmentIncomeMember2021-01-012021-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:GainLossOnInvestmentsMember12021-01-012021-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestExpenseMember2021-01-012021-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InvestmentIncomeMember2020-01-012020-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:GainLossOnInvestmentsMember12020-01-012020-09-300000005513us-gaap:FairValueHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMemberus-gaap:InterestExpenseMember2020-01-012020-09-300000005513us-gaap:ForwardContractsMemberus-gaap:CashFlowHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-07-012021-09-300000005513us-gaap:ForwardContractsMemberus-gaap:CashFlowHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-07-012020-09-300000005513us-gaap:ForwardContractsMemberus-gaap:CashFlowHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-01-012020-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-07-012021-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-07-012020-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-01-012021-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:ForeignExchangeContractMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-01-012020-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-07-012021-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-07-012020-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMember2021-01-012021-09-300000005513us-gaap:CashFlowHedgingMemberus-gaap:DesignatedAsHedgingInstrumentMember2020-01-012020-09-300000005513us-gaap:NondesignatedMemberus-gaap:CreditDefaultSwapMember2021-07-012021-09-300000005513us-gaap:NondesignatedMemberus-gaap:CreditDefaultSwapMember2020-07-012020-09-300000005513us-gaap:NondesignatedMemberus-gaap:CreditDefaultSwapMember2021-01-012021-09-300000005513us-gaap:NondesignatedMemberus-gaap:CreditDefaultSwapMember2020-01-012020-09-300000005513us-gaap:NondesignatedMemberus-gaap:ForeignExchangeContractMember2021-07-012021-09-300000005513us-gaap:NondesignatedMemberus-gaap:ForeignExchangeContractMember2020-07-012020-09-300000005513us-gaap:NondesignatedMemberus-gaap:ForeignExchangeContractMember2021-01-012021-09-300000005513us-gaap:NondesignatedMemberus-gaap:ForeignExchangeContractMember2020-01-012020-09-300000005513us-gaap:NondesignatedMemberus-gaap:EmbeddedDerivativeFinancialInstrumentsMember2021-07-012021-09-300000005513us-gaap:NondesignatedMemberus-gaap:EmbeddedDerivativeFinancialInstrumentsMember2020-07-012020-09-300000005513us-gaap:NondesignatedMemberus-gaap:EmbeddedDerivativeFinancialInstrumentsMember2021-01-012021-09-300000005513us-gaap:NondesignatedMemberus-gaap:EmbeddedDerivativeFinancialInstrumentsMember2020-01-012020-09-300000005513us-gaap:NondesignatedMember2021-07-012021-09-300000005513us-gaap:NondesignatedMember2020-07-012020-09-300000005513us-gaap:NondesignatedMember2021-01-012021-09-300000005513us-gaap:NondesignatedMember2020-01-012020-09-300000005513us-gaap:NondesignatedMemberus-gaap:TotalReturnSwapMember2021-07-012021-09-300000005513us-gaap:NondesignatedMemberus-gaap:TotalReturnSwapMember2020-07-012020-09-300000005513us-gaap:NondesignatedMemberus-gaap:TotalReturnSwapMember2021-01-012021-09-300000005513us-gaap:NondesignatedMemberus-gaap:TotalReturnSwapMember2020-01-012020-09-300000005513us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2021-06-300000005513us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2021-06-300000005513us-gaap:AccumulatedTranslationAdjustmentMember2021-06-300000005513us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-06-300000005513us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2021-07-012021-09-300000005513us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2021-07-012021-09-300000005513us-gaap:AccumulatedTranslationAdjustmentMember2021-07-012021-09-300000005513us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-07-012021-09-300000005513us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2021-09-300000005513us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2021-09-300000005513us-gaap:AccumulatedTranslationAdjustmentMember2021-09-300000005513us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-09-300000005513us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2020-06-300000005513us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2020-06-300000005513us-gaap:AccumulatedTranslationAdjustmentMember2020-06-300000005513us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-06-300000005513us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2020-07-012020-09-300000005513us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2020-07-012020-09-300000005513us-gaap:AccumulatedTranslationAdjustmentMember2020-07-012020-09-300000005513us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-07-012020-09-300000005513us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2020-09-300000005513us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2020-09-300000005513us-gaap:AccumulatedTranslationAdjustmentMember2020-09-300000005513us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-09-300000005513us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2020-12-310000005513us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2020-12-310000005513us-gaap:AccumulatedTranslationAdjustmentMember2020-12-310000005513us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-12-310000005513us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2021-01-012021-09-300000005513us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2021-01-012021-09-300000005513us-gaap:AccumulatedTranslationAdjustmentMember2021-01-012021-09-300000005513us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2021-01-012021-09-300000005513us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2019-12-310000005513us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2019-12-310000005513us-gaap:AccumulatedTranslationAdjustmentMember2019-12-310000005513us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2019-12-310000005513us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember2020-01-012020-09-300000005513us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember2020-01-012020-09-300000005513us-gaap:AccumulatedTranslationAdjustmentMember2020-01-012020-09-300000005513us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember2020-01-012020-09-300000005513us-gaap:DebtSecuritiesMember2021-09-300000005513us-gaap:DebtSecuritiesMember2021-06-300000005513us-gaap:DebtSecuritiesMember2020-12-310000005513us-gaap:DebtSecuritiesMember2021-07-012021-09-300000005513us-gaap:DebtSecuritiesMember2021-01-012021-09-300000005513unm:DeferredAcquisitionCostsMember2021-09-300000005513unm:DeferredAcquisitionCostsMember2021-06-300000005513unm:DeferredAcquisitionCostsMember2020-12-310000005513unm:DeferredAcquisitionCostsMember2021-07-012021-09-300000005513unm:DeferredAcquisitionCostsMember2021-01-012021-09-300000005513unm:ReserveForFuturePolicyAndContractBenefitsMember2021-09-300000005513unm:ReserveForFuturePolicyAndContractBenefitsMember2021-06-300000005513unm:ReserveForFuturePolicyAndContractBenefitsMember2020-12-310000005513unm:ReserveForFuturePolicyAndContractBenefitsMember2021-07-012021-09-300000005513unm:ReserveForFuturePolicyAndContractBenefitsMember2021-01-012021-09-300000005513us-gaap:ReinsuranceRecoverableMember2021-09-300000005513us-gaap:ReinsuranceRecoverableMember2021-06-300000005513us-gaap:ReinsuranceRecoverableMember2020-12-310000005513us-gaap:ReinsuranceRecoverableMember2021-07-012021-09-300000005513us-gaap:ReinsuranceRecoverableMember2021-01-012021-09-300000005513us-gaap:DeferredIncomeTaxChargesMember2021-09-300000005513us-gaap:DeferredIncomeTaxChargesMember2021-06-300000005513us-gaap:DeferredIncomeTaxChargesMember2020-12-310000005513us-gaap:DeferredIncomeTaxChargesMember2021-07-012021-09-300000005513us-gaap:DeferredIncomeTaxChargesMember2021-01-012021-09-300000005513us-gaap:DebtSecuritiesMember2020-09-300000005513us-gaap:DebtSecuritiesMember2020-06-300000005513us-gaap:DebtSecuritiesMember2019-12-310000005513us-gaap:DebtSecuritiesMember2020-07-012020-09-300000005513us-gaap:DebtSecuritiesMember2020-01-012020-09-300000005513unm:DeferredAcquisitionCostsMember2020-09-300000005513unm:DeferredAcquisitionCostsMember2020-06-300000005513unm:DeferredAcquisitionCostsMember2019-12-310000005513unm:DeferredAcquisitionCostsMember2020-07-012020-09-300000005513unm:DeferredAcquisitionCostsMember2020-01-012020-09-300000005513unm:ReserveForFuturePolicyAndContractBenefitsMember2020-09-300000005513unm:ReserveForFuturePolicyAndContractBenefitsMember2020-06-300000005513unm:ReserveForFuturePolicyAndContractBenefitsMember2019-12-310000005513unm:ReserveForFuturePolicyAndContractBenefitsMember2020-07-012020-09-300000005513unm:ReserveForFuturePolicyAndContractBenefitsMember2020-01-012020-09-300000005513us-gaap:ReinsuranceRecoverableMember2020-09-300000005513us-gaap:ReinsuranceRecoverableMember2020-06-300000005513us-gaap:ReinsuranceRecoverableMember2019-12-310000005513us-gaap:ReinsuranceRecoverableMember2020-07-012020-09-300000005513us-gaap:ReinsuranceRecoverableMember2020-01-012020-09-300000005513us-gaap:DeferredIncomeTaxChargesMember2020-09-300000005513us-gaap:DeferredIncomeTaxChargesMember2020-06-300000005513us-gaap:DeferredIncomeTaxChargesMember2019-12-310000005513us-gaap:DeferredIncomeTaxChargesMember2020-07-012020-09-300000005513us-gaap:DeferredIncomeTaxChargesMember2020-01-012020-09-300000005513us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2021-07-012021-09-300000005513us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2020-07-012020-09-300000005513us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2021-01-012021-09-300000005513us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2020-01-012020-09-300000005513us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:InterestRateSwapMember2021-07-012021-09-300000005513us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:InterestRateSwapMember2020-07-012020-09-300000005513us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:InterestRateSwapMember2021-01-012021-09-300000005513us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:InterestRateSwapMember2020-01-012020-09-300000005513us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMemberus-gaap:ForeignExchangeContractMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2021-07-012021-09-300000005513us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMemberus-gaap:ForeignExchangeContractMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2020-07-012020-09-300000005513us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMemberus-gaap:ForeignExchangeContractMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2021-01-012021-09-300000005513us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMemberus-gaap:ForeignExchangeContractMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2020-01-012020-09-300000005513us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2021-07-012021-09-300000005513us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2020-07-012020-09-300000005513us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2021-01-012021-09-300000005513us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2020-01-012020-09-300000005513us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember2021-07-012021-09-300000005513us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember2020-07-012020-09-300000005513us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember2021-01-012021-09-300000005513us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMemberus-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember2020-01-012020-09-300000005513us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2021-07-012021-09-300000005513us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2020-07-012020-09-300000005513us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2021-01-012021-09-300000005513us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2020-01-012020-09-300000005513us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2021-07-012021-09-300000005513us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2020-07-012020-09-300000005513us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2021-01-012021-09-300000005513us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMemberus-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember2020-01-012020-09-300000005513unm:AmountRelatedtoInterestMember2021-01-012021-09-300000005513unm:AmountRelatedtoInterestMember2020-01-012020-09-300000005513unm:IncurredClaimsMember2021-01-012021-09-300000005513unm:IncurredClaimsMember2020-01-012020-09-300000005513unm:ForeignCurrencyMember2021-01-012021-09-300000005513unm:ForeignCurrencyMember2020-01-012020-09-300000005513us-gaap:OperatingExpenseMember2021-01-012021-09-300000005513us-gaap:OperatingExpenseMember2020-01-012020-09-300000005513unm:Phase2Memberunm:ClosedBlockIndividualDisabilityReinsuranceTransactionMember2021-09-300000005513unm:Phase2Memberunm:ClosedBlockIndividualDisabilityReinsuranceTransactionMember2021-01-012021-09-300000005513unm:GroupLongTermDisabilityMemberus-gaap:OperatingSegmentsMemberunm:UnumUsMember2021-07-012021-09-300000005513unm:GroupLongTermDisabilityMemberus-gaap:OperatingSegmentsMemberunm:UnumUsMember2020-07-012020-09-300000005513unm:GroupLongTermDisabilityMemberus-gaap:OperatingSegmentsMemberunm:UnumUsMember2021-01-012021-09-300000005513unm:GroupLongTermDisabilityMemberus-gaap:OperatingSegmentsMemberunm:UnumUsMember2020-01-012020-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnumUsMemberunm:GroupShortTermDisabilityMember2021-07-012021-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnumUsMemberunm:GroupShortTermDisabilityMember2020-07-012020-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnumUsMemberunm:GroupShortTermDisabilityMember2021-01-012021-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnumUsMemberunm:GroupShortTermDisabilityMember2020-01-012020-09-300000005513unm:GroupLifeMemberus-gaap:OperatingSegmentsMemberunm:UnumUsMember2021-07-012021-09-300000005513unm:GroupLifeMemberus-gaap:OperatingSegmentsMemberunm:UnumUsMember2020-07-012020-09-300000005513unm:GroupLifeMemberus-gaap:OperatingSegmentsMemberunm:UnumUsMember2021-01-012021-09-300000005513unm:GroupLifeMemberus-gaap:OperatingSegmentsMemberunm:UnumUsMember2020-01-012020-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnumUsMemberunm:AccidentalDeathDismembermentMember2021-07-012021-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnumUsMemberunm:AccidentalDeathDismembermentMember2020-07-012020-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnumUsMemberunm:AccidentalDeathDismembermentMember2021-01-012021-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnumUsMemberunm:AccidentalDeathDismembermentMember2020-01-012020-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnumUsMemberunm:IndividualDisabilityInsuranceMember2021-07-012021-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnumUsMemberunm:IndividualDisabilityInsuranceMember2020-07-012020-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnumUsMemberunm:IndividualDisabilityInsuranceMember2021-01-012021-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnumUsMemberunm:IndividualDisabilityInsuranceMember2020-01-012020-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnumUsMemberunm:VoluntaryBenefitsMember2021-07-012021-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnumUsMemberunm:VoluntaryBenefitsMember2020-07-012020-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnumUsMemberunm:VoluntaryBenefitsMember2021-01-012021-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnumUsMemberunm:VoluntaryBenefitsMember2020-01-012020-09-300000005513unm:DentalandVisionMemberus-gaap:OperatingSegmentsMemberunm:UnumUsMember2021-07-012021-09-300000005513unm:DentalandVisionMemberus-gaap:OperatingSegmentsMemberunm:UnumUsMember2020-07-012020-09-300000005513unm:DentalandVisionMemberus-gaap:OperatingSegmentsMemberunm:UnumUsMember2021-01-012021-09-300000005513unm:DentalandVisionMemberus-gaap:OperatingSegmentsMemberunm:UnumUsMember2020-01-012020-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnumUsMember2021-07-012021-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnumUsMember2020-07-012020-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnumUsMember2021-01-012021-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnumUsMember2020-01-012020-09-300000005513unm:UnumInternationalMemberunm:GroupLongTermDisabilityMemberus-gaap:OperatingSegmentsMember2021-07-012021-09-300000005513unm:UnumInternationalMemberunm:GroupLongTermDisabilityMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000005513unm:UnumInternationalMemberunm:GroupLongTermDisabilityMemberus-gaap:OperatingSegmentsMember2021-01-012021-09-300000005513unm:UnumInternationalMemberunm:GroupLongTermDisabilityMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000005513unm:GroupLifeMemberunm:UnumInternationalMemberus-gaap:OperatingSegmentsMember2021-07-012021-09-300000005513unm:GroupLifeMemberunm:UnumInternationalMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000005513unm:GroupLifeMemberunm:UnumInternationalMemberus-gaap:OperatingSegmentsMember2021-01-012021-09-300000005513unm:GroupLifeMemberunm:UnumInternationalMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000005513unm:SupplementalandVoluntaryInsuranceMemberunm:UnumInternationalMemberus-gaap:OperatingSegmentsMember2021-07-012021-09-300000005513unm:SupplementalandVoluntaryInsuranceMemberunm:UnumInternationalMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000005513unm:SupplementalandVoluntaryInsuranceMemberunm:UnumInternationalMemberus-gaap:OperatingSegmentsMember2021-01-012021-09-300000005513unm:SupplementalandVoluntaryInsuranceMemberunm:UnumInternationalMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000005513unm:UnumPolandMemberunm:UnumInternationalMemberus-gaap:OperatingSegmentsMember2021-07-012021-09-300000005513unm:UnumPolandMemberunm:UnumInternationalMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000005513unm:UnumPolandMemberunm:UnumInternationalMemberus-gaap:OperatingSegmentsMember2021-01-012021-09-300000005513unm:UnumPolandMemberunm:UnumInternationalMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000005513unm:UnumInternationalMemberus-gaap:OperatingSegmentsMember2021-07-012021-09-300000005513unm:UnumInternationalMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000005513unm:UnumInternationalMemberus-gaap:OperatingSegmentsMember2021-01-012021-09-300000005513unm:UnumInternationalMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000005513us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:OperatingSegmentsMemberunm:ColonialLifeMember2021-07-012021-09-300000005513us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:OperatingSegmentsMemberunm:ColonialLifeMember2020-07-012020-09-300000005513us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:OperatingSegmentsMemberunm:ColonialLifeMember2021-01-012021-09-300000005513us-gaap:AccidentAndHealthInsuranceSegmentMemberus-gaap:OperatingSegmentsMemberunm:ColonialLifeMember2020-01-012020-09-300000005513us-gaap:LifeInsuranceSegmentMemberus-gaap:OperatingSegmentsMemberunm:ColonialLifeMember2021-07-012021-09-300000005513us-gaap:LifeInsuranceSegmentMemberus-gaap:OperatingSegmentsMemberunm:ColonialLifeMember2020-07-012020-09-300000005513us-gaap:LifeInsuranceSegmentMemberus-gaap:OperatingSegmentsMemberunm:ColonialLifeMember2021-01-012021-09-300000005513us-gaap:LifeInsuranceSegmentMemberus-gaap:OperatingSegmentsMemberunm:ColonialLifeMember2020-01-012020-09-300000005513unm:CancerAndCriticalIllnessColonialMemberus-gaap:OperatingSegmentsMemberunm:ColonialLifeMember2021-07-012021-09-300000005513unm:CancerAndCriticalIllnessColonialMemberus-gaap:OperatingSegmentsMemberunm:ColonialLifeMember2020-07-012020-09-300000005513unm:CancerAndCriticalIllnessColonialMemberus-gaap:OperatingSegmentsMemberunm:ColonialLifeMember2021-01-012021-09-300000005513unm:CancerAndCriticalIllnessColonialMemberus-gaap:OperatingSegmentsMemberunm:ColonialLifeMember2020-01-012020-09-300000005513us-gaap:OperatingSegmentsMemberunm:ColonialLifeMember2021-07-012021-09-300000005513us-gaap:OperatingSegmentsMemberunm:ColonialLifeMember2020-07-012020-09-300000005513us-gaap:OperatingSegmentsMemberunm:ColonialLifeMember2021-01-012021-09-300000005513us-gaap:OperatingSegmentsMemberunm:ColonialLifeMember2020-01-012020-09-300000005513unm:LongTermCareMemberunm:ClosedBlockMemberus-gaap:OperatingSegmentsMember2021-07-012021-09-300000005513unm:LongTermCareMemberunm:ClosedBlockMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000005513unm:LongTermCareMemberunm:ClosedBlockMemberus-gaap:OperatingSegmentsMember2021-01-012021-09-300000005513unm:LongTermCareMemberunm:ClosedBlockMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000005513unm:ClosedBlockMemberus-gaap:OperatingSegmentsMemberunm:IndividualDisabilityInsuranceMember2021-07-012021-09-300000005513unm:ClosedBlockMemberus-gaap:OperatingSegmentsMemberunm:IndividualDisabilityInsuranceMember2020-07-012020-09-300000005513unm:ClosedBlockMemberus-gaap:OperatingSegmentsMemberunm:IndividualDisabilityInsuranceMember2021-01-012021-09-300000005513unm:ClosedBlockMemberus-gaap:OperatingSegmentsMemberunm:IndividualDisabilityInsuranceMember2020-01-012020-09-300000005513us-gaap:OtherInsuranceProductLineMemberunm:ClosedBlockMemberus-gaap:OperatingSegmentsMember2021-07-012021-09-300000005513us-gaap:OtherInsuranceProductLineMemberunm:ClosedBlockMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000005513us-gaap:OtherInsuranceProductLineMemberunm:ClosedBlockMemberus-gaap:OperatingSegmentsMember2021-01-012021-09-300000005513us-gaap:OtherInsuranceProductLineMemberunm:ClosedBlockMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000005513unm:ClosedBlockMemberus-gaap:OperatingSegmentsMember2021-07-012021-09-300000005513unm:ClosedBlockMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000005513unm:ClosedBlockMemberus-gaap:OperatingSegmentsMember2021-01-012021-09-300000005513unm:ClosedBlockMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000005513us-gaap:OperatingSegmentsMember2021-07-012021-09-300000005513us-gaap:OperatingSegmentsMember2020-07-012020-09-300000005513us-gaap:OperatingSegmentsMember2021-01-012021-09-300000005513us-gaap:OperatingSegmentsMember2020-01-012020-09-300000005513us-gaap:CorporateAndOtherMemberus-gaap:OperatingSegmentsMember2021-07-012021-09-300000005513us-gaap:CorporateAndOtherMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000005513us-gaap:CorporateAndOtherMemberus-gaap:OperatingSegmentsMember2021-01-012021-09-300000005513us-gaap:CorporateAndOtherMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnumUsMember2021-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnumUsMember2020-12-310000005513unm:UnumInternationalMemberus-gaap:OperatingSegmentsMember2021-09-300000005513unm:UnumInternationalMemberus-gaap:OperatingSegmentsMember2020-12-310000005513us-gaap:OperatingSegmentsMemberunm:ColonialLifeMember2021-09-300000005513us-gaap:OperatingSegmentsMemberunm:ColonialLifeMember2020-12-310000005513unm:ClosedBlockMemberus-gaap:OperatingSegmentsMember2021-09-300000005513unm:ClosedBlockMemberus-gaap:OperatingSegmentsMember2020-12-310000005513us-gaap:CorporateAndOtherMemberus-gaap:OperatingSegmentsMember2021-09-300000005513us-gaap:CorporateAndOtherMemberus-gaap:OperatingSegmentsMember2020-12-310000005513us-gaap:OperatingSegmentsMemberunm:UnrelatedToSignificantTransactionMember2021-07-012021-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnrelatedToSignificantTransactionMember2020-07-012020-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnrelatedToSignificantTransactionMember2020-01-012020-09-300000005513unm:ClosedBlockIndividualDisabilityReinsuranceTransactionMemberus-gaap:OperatingSegmentsMember2021-07-012021-09-300000005513unm:ClosedBlockIndividualDisabilityReinsuranceTransactionMemberus-gaap:OperatingSegmentsMember2020-07-012020-09-300000005513unm:ClosedBlockIndividualDisabilityReinsuranceTransactionMemberus-gaap:OperatingSegmentsMember2021-01-012021-09-300000005513unm:ClosedBlockIndividualDisabilityReinsuranceTransactionMemberus-gaap:OperatingSegmentsMember2020-01-012020-09-300000005513us-gaap:OperatingSegmentsMemberunm:UnrelatedToSignificantTransactionMember2021-01-012021-09-300000005513country:USus-gaap:PensionPlansDefinedBenefitMember2021-07-012021-09-300000005513country:USus-gaap:PensionPlansDefinedBenefitMember2020-07-012020-09-300000005513us-gaap:PensionPlansDefinedBenefitMembercountry:GB2021-07-012021-09-300000005513us-gaap:PensionPlansDefinedBenefitMembercountry:GB2020-07-012020-09-300000005513us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-07-012021-09-300000005513us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-07-012020-09-300000005513country:USus-gaap:PensionPlansDefinedBenefitMember2021-01-012021-09-300000005513country:USus-gaap:PensionPlansDefinedBenefitMember2020-01-012020-09-300000005513us-gaap:PensionPlansDefinedBenefitMembercountry:GB2021-01-012021-09-300000005513us-gaap:PensionPlansDefinedBenefitMembercountry:GB2020-01-012020-09-300000005513us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2021-01-012021-09-300000005513us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember2020-01-012020-09-300000005513unm:RepurchaseProgramAuthorizedInOctober2021Memberus-gaap:SubsequentEventMember2021-10-250000005513us-gaap:SeniorNotesMemberunm:A4125SeniorNotesDue2051Member2021-09-300000005513unm:Notes4500Due2025Member2021-09-300000005513unm:Notes4500Due2025Member2021-01-012021-09-300000005513unm:ThreeYearUnsecuredRevolvingCreditFacilityMember2021-09-300000005513us-gaap:StandbyLettersOfCreditMember2021-09-3000000055132020-01-010000005513unm:ClosedBlockIndividualDisabilityReinsuranceTransactionMemberunm:Phases1And2Member2021-09-300000005513unm:ClosedBlockIndividualDisabilityReinsuranceTransactionMember2021-07-012021-09-300000005513unm:ClosedBlockIndividualDisabilityReinsuranceTransactionMember2021-01-012021-09-30



UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D. C. 20549

FORM 10-Q

(Mark One)

Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
For the quarterly period ended September 30, 2021

Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
For the transition period from to

Commission file number 001-11294

Unum Group
(Exact name of registrant as specified in its charter)
Delaware
62-1598430
(State or other jurisdiction of incorporation or organization)(I.R.S. Employer Identification No.)
1 Fountain Square
Chattanooga, Tennessee
37402
(Address of principal executive offices)(Zip Code)
(423) 294-1011
(Registrant's telephone number, including area code)
Not Applicable
(Former name, former address and former fiscal year, if changed since last report)

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered
Common stock, $0.10 par value
UNM
New York Stock Exchange
6.250% Junior Subordinated Notes due 2058
UNMA
New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes [X] No [ ]

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes [X] No [ ]




Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act.
(Check one):
Large Accelerated Filer
xAccelerated filer
Non-accelerated filer¨Smaller reporting company 
Emerging growth company
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes No ☒

204,453,307 shares of the registrant's common stock were outstanding as of November 1, 2021.








 TABLE OF CONTENTS

Page





Cautionary Statement Regarding Forward-Looking Statements
The Private Securities Litigation Reform Act of 1995 (the Act) provides a "safe harbor" to encourage companies to provide prospective information, as long as those statements are identified as forward-looking and are accompanied by meaningful cautionary statements identifying important factors that could cause actual results to differ materially from those included in the forward-looking statements. Certain information contained in this quarterly report on Form 10-Q (including certain statements in the consolidated financial statements and related notes and Management's Discussion and Analysis), or in any other written or oral statements made by us in communications with the financial community or contained in documents filed with the Securities and Exchange Commission (SEC), may be considered forward-looking statements within the meaning of the Act. Forward-looking statements are those not based on historical information, but rather relate to our outlook, future operations, strategies, financial results, or other developments. Forward-looking statements speak only as of the date made. We undertake no obligation to update these statements, even if made available on our website or otherwise. These statements may be made directly in this document or may be made part of this document by reference to other documents filed by us with the SEC, a practice which is known as "incorporation by reference." You can find many of these statements by looking for words such as "will," "may," "should," "could," "believes," "expects," "anticipates," "estimates," "plans," "assumes," "intends," "projects," "goals,” "objectives," or similar expressions in this document or in documents incorporated herein.

These forward-looking statements are subject to numerous assumptions, risks, and uncertainties, many of which are beyond our control. We caution readers that the following factors, in addition to other factors mentioned from time to time, may cause actual results to differ materially from those contemplated by the forward-looking statements:

The impact of the COVID-19 pandemic on our business, financial position, results of operations, liquidity and capital resources, and overall business operations.
Sustained periods of low interest rates.
Fluctuation in insurance reserve liabilities and claim payments due to changes in claim incidence, recovery rates, mortality and morbidity rates, and policy benefit offsets due to, among other factors, the rate of unemployment and consumer confidence, the emergence of new diseases, epidemics, or pandemics, new trends and developments in medical treatments, the effectiveness of our claims operational processes, and changes in governmental programs.
Unfavorable economic or business conditions, both domestic and foreign, that may result in decreases in sales, premiums, or persistency, as well as unfavorable claims activity.
Changes in, or interpretations or enforcement of, laws and regulations.
A cyber attack or other security breach could result in the unauthorized acquisition of confidential data.
The failure of our business recovery and incident management processes to resume our business operations in the event of a natural catastrophe, cyber attack, or other event.
Investment results, including, but not limited to, changes in interest rates, defaults, changes in credit spreads, impairments, and the lack of appropriate investments in the market which can be acquired to match our liabilities.
Increased competition from other insurers and financial services companies due to industry consolidation, new entrants to our markets, or other factors.
Changes in our financial strength and credit ratings.
Our ability to develop digital capabilities or execute on our technology systems upgrades or replacements.
Actual experience in the broad array of our products that deviates from our assumptions used in pricing, underwriting, and reserving.
Availability of reinsurance in the market and the ability of our reinsurers to meet their obligations to us.
Ability to generate sufficient internal liquidity and/or obtain external financing.
Damage to our reputation due to, among other factors, regulatory investigations, legal proceedings, external events, and/or inadequate or failed internal controls and procedures.
Recoverability and/or realization of the carrying value of our intangible assets, long-lived assets, and deferred tax assets.
Effectiveness of our risk management program.
Contingencies and the level and results of litigation.
Ineffectiveness of our derivatives hedging programs due to changes in the economic environment, counterparty risk, ratings downgrades, capital market volatility, changes in interest rates, and/or regulation.
Fluctuation in foreign currency exchange rates.

For further discussion of risks and uncertainties which could cause actual results to differ from those contained in the forward-looking statements, see Part 1, Item 1A of our annual report on Form 10-K for the year ended December 31, 2020.

All subsequent written and oral forward-looking statements attributable to us or any person acting on our behalf are expressly qualified in their entirety by the cautionary statements contained or referred to in this section.
1


PART I - FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

CONSOLIDATED BALANCE SHEETS

Unum Group and Subsidiaries
 
September 30December 31
20212020
 (in millions of dollars)
(Unaudited)
Assets
Investments
Fixed Maturity Securities - at fair value (amortized cost of $37,355.0; $36,546.5; allowance for credit losses of $; $6.8)
$43,628.3 $44,137.3 
Mortgage Loans (net of allowance for credit losses of $11.3; $13.1)
2,499.4 2,432.1 
Policy Loans3,691.4 3,683.9 
Other Long-term Investments1,124.5 960.2 
Short-term Investments1,472.7 1,470.0 
Total Investments52,416.3 52,683.5 
Other Assets
Cash and Bank Deposits121.7 197.0 
Accounts and Premiums Receivable (net of allowance for credit losses of $32.6; $38.8)
1,545.9 1,519.3 
Reinsurance Recoverable (net of allowance for credit losses of $2.3; $11.7)
11,105.8 10,666.0 
Accrued Investment Income598.2 611.4 
Deferred Acquisition Costs2,231.5 2,272.6 
Goodwill352.1 353.0 
Property and Equipment462.5 498.0 
Income Tax Receivable 72.7 
Other Assets1,763.9 1,752.3 
Total Assets$70,597.9 $70,625.8 
    
 See notes to consolidated financial statements.

2


CONSOLIDATED BALANCE SHEETS - Continued

Unum Group and Subsidiaries

September 30December 31
 20212020
 (in millions of dollars)
(Unaudited)
Liabilities and Stockholders' Equity
Liabilities
Policy and Contract Benefits$1,920.4 $1,855.4 
Reserves for Future Policy and Contract Benefits48,475.7 49,653.0 
Unearned Premiums414.3 349.3 
Other Policyholders’ Funds1,763.1 1,663.9 
Income Tax Payable40.7  
Deferred Income Tax424.8 416.1 
Long-term Debt3,441.4 3,345.7 
Other Liabilities 2,999.3 2,471.4 
Total Liabilities59,479.7 59,754.8 
Commitments and Contingent Liabilities - Note 11
Stockholders' Equity
Common Stock, $0.10 par
Authorized: 725,000,000 shares
Issued: 307,282,297 and 306,566,572 shares
30.7 30.7 
Additional Paid-in Capital2,398.5 2,376.2 
Accumulated Other Comprehensive Income113.9 374.2 
Retained Earnings11,754.8 11,269.6 
Treasury Stock - at cost: 102,876,514 shares
(3,179.7)(3,179.7)
Total Stockholders' Equity11,118.2 10,871.0 
Total Liabilities and Stockholders' Equity$70,597.9 $70,625.8 

See notes to consolidated financial statements.
3


CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)

Unum Group and Subsidiaries
 
Three Months Ended September 30Nine Months Ended September 30
 2021202020212020
 (in millions of dollars, except share data)
Revenue
Premium Income$2,353.7 $2,318.1 $7,106.4 $7,058.2 
Net Investment Income550.2 613.2 1,662.4 1,767.2 
Net Realized Investment Gain (Loss)(0.1)4.4 85.4 (105.8)
Other Income65.9 60.6 180.5 169.0 
Total Revenue2,969.7 2,996.3 9,034.7 8,888.6 
Benefits and Expenses
Benefits and Change in Reserves for Future Benefits1,753.9 1,888.6 5,659.2 5,626.2 
Commissions258.3 258.3 777.9 810.5 
Interest and Debt Expense44.7 49.4 134.4 142.6 
Cost Related to Early Retirement of Debt  67.3  
Deferral of Acquisition Costs(128.6)(134.9)(388.9)(446.8)
Amortization of Deferred Acquisition Costs138.4 149.7 440.8 466.6 
Compensation Expense241.6 253.3 725.9 726.0 
Other Expenses251.5 232.3 746.8 724.2 
Total Benefits and Expenses2,559.8 2,696.7 8,163.4 8,049.3 
Income Before Income Tax 409.9 299.6 871.3 839.3 
Income Tax Expense
Current46.5 45.1 164.4 173.3 
Deferred34.8 23.4 42.4 8.4 
Total Income Tax Expense81.3 68.5 206.8 181.7 
Net Income$328.6 $231.1 $664.5 $657.6 
Net Income Per Common Share
Basic$1.61 $1.13 $3.25 $3.23 
Assuming Dilution$1.60 $1.13 $3.24 $3.23 

See notes to consolidated financial statements.
4


CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)

Unum Group and Subsidiaries
 
 Three Months Ended September 30Nine Months Ended September 30
 2021202020212020
 (in millions of dollars)
Net Income$328.6 $231.1 $664.5 $657.6 
Other Comprehensive Income (Loss)
Change in Net Unrealized Gain on Securities Before Adjustment (net of tax expense (benefit) of $(69.0); $126.6; $(276.3); $344.0)
(260.8)481.4 (1,048.0)1,322.4 
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance (net of tax expense (benefit) of $49.5; $(89.9); $215.5; $(219.7))
185.4 (340.0)816.3 (833.8)
Change in Net Gain on Hedges (net of tax benefit of $2.2; $6.7; $7.6; $7.2)
(8.0)(27.5)(28.3)(29.1)
Change in Foreign Currency Translation Adjustment (net of tax expense (benefit) of $1.8; $(1.9); $3.4; $(1.1))
(30.5)34.5 (13.9)(32.1)
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense of $1.8; $0.4; $4.2; $3.4)
5.7 2.0 13.6 12.9 
Total Other Comprehensive Income (Loss)(108.2)150.4 (260.3)440.3 
Comprehensive Income $220.4 $381.5 $404.2 $1,097.9 

See notes to consolidated financial statements.
5


CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED)

Unum Group and Subsidiaries
     
Three Months Ended September 30Nine Months Ended September 30
 2021202020212020
 (in millions of dollars)
Common Stock
Balance at Beginning of Period$30.7 $30.6 $30.7 $30.6 
Common Stock Activity 0.1  0.1 
Balance at End of Period30.7 30.7 30.7 30.7 
Additional Paid-in Capital
Balance at Beginning of Period2,386.8 2,364.1 2,376.2 2,348.1 
Common Stock Activity11.7 7.2 22.3 23.2 
Balance at End of Period2,398.5 2,371.3 2,398.5 2,371.3 
Accumulated Other Comprehensive Income
Balance at Beginning of Period222.1 327.2 374.2 37.3 
Other Comprehensive Income (Loss)(108.2)150.4 (260.3)440.3 
Balance at End of Period113.9 477.6 113.9 477.6 
Retained Earnings
Balance at Beginning of Period11,487.6 11,019.2 11,269.6 10,728.7 
Adjustment to Adopt Accounting Standard Update - Note 2   (18.9)
Balance at Beginning of Period, as Adjusted11,487.6 11,019.2 11,269.6 10,709.8 
Net Income328.6 231.1 664.5 657.6 
Dividends to Stockholders (per common share: $0.300; $0.285; $0.870; $0.855)
(61.4)(58.0)(179.3)(175.1)
Balance at End of Period11,754.8 11,192.3 11,754.8 11,192.3 
Treasury Stock
Balance at Beginning and End of Period(3,179.7)(3,179.7)(3,179.7)(3,179.7)
Total Stockholders' Equity at End of Period$11,118.2 $10,892.2 $11,118.2 $10,892.2 

See notes to consolidated financial statements.
6


CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)

Unum Group and Subsidiaries
 
 Nine Months Ended September 30
 20212020
 (in millions of dollars)
Cash Flows from Operating Activities
Net Income$664.5 $657.6 
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Change in Receivables427.2 163.2 
Change in Deferred Acquisition Costs51.9 19.8 
Change in Insurance Reserves and Liabilities223.7 129.2 
Change in Income Taxes205.0 162.0 
Change in Other Accrued Liabilities(64.2)(1.5)
Non-cash Components of Net Investment Income(175.8)(111.3)
Net Realized Investment (Gain) Loss(85.4)105.8 
Depreciation90.0 85.6 
Cash Related to Reinsurance Agreement(456.8) 
Amortization of the Cost of Reinsurance59.4  
Other, Net59.8 68.4 
Net Cash Provided by Operating Activities999.3 1,278.8 
Cash Flows from Investing Activities
Proceeds from Sales of Fixed Maturity Securities322.3 499.7 
Proceeds from Maturities of Fixed Maturity Securities1,976.6 1,594.2 
Proceeds from Sales and Maturities of Other Investments273.8 163.9