XML 54 R67.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Notional Amounts for Each Category of Derivative Activity (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Derivative |  |  |
Balance at beginning of period | $ 1,477.4 invest_DerivativeNotionalAmount | $ 1,432.8 invest_DerivativeNotionalAmount | $ 1,413.0 invest_DerivativeNotionalAmount
Additions | 318.1 unm_NotionalAmountOfDerivativesAdditions | 291.0 unm_NotionalAmountOfDerivativesAdditions | 336.0 unm_NotionalAmountOfDerivativesAdditions
Terminations | 108.1 unm_NotionalAmountOfDerivativesTerminations | 246.4 unm_NotionalAmountOfDerivativesTerminations | 316.2 unm_NotionalAmountOfDerivativesTerminations
Balance at ending of period | 1,687.4 invest_DerivativeNotionalAmount | 1,477.4 invest_DerivativeNotionalAmount | 1,432.8 invest_DerivativeNotionalAmount
Credit Default Swaps |  |  |
Derivative |  |  |
Balance at ending of period | 97.0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_CreditDefaultSwapMember |  |
Swaps | Credit Default Swaps |  |  |
Derivative |  |  |
Balance at beginning of period | 97.0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_CreditDefaultSwapMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_CreditDefaultSwapMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_CreditDefaultSwapMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember
Additions | 0 unm_NotionalAmountOfDerivativesAdditions / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_CreditDefaultSwapMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 97.0 unm_NotionalAmountOfDerivativesAdditions / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_CreditDefaultSwapMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 0 unm_NotionalAmountOfDerivativesAdditions / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_CreditDefaultSwapMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember
Terminations | 0 unm_NotionalAmountOfDerivativesTerminations / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_CreditDefaultSwapMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 0 unm_NotionalAmountOfDerivativesTerminations / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_CreditDefaultSwapMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 0 unm_NotionalAmountOfDerivativesTerminations / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_CreditDefaultSwapMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember
Balance at ending of period | 97.0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_CreditDefaultSwapMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 97.0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_CreditDefaultSwapMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = us-gaap_CreditDefaultSwapMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember
Swaps | Receive Variable/Pay Fixed |  |  |
Derivative |  |  |
Balance at beginning of period | 150.0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveVariablePayFixedMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 174.0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveVariablePayFixedMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 174.0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveVariablePayFixedMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember
Additions | 0 unm_NotionalAmountOfDerivativesAdditions / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveVariablePayFixedMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 0 unm_NotionalAmountOfDerivativesAdditions / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveVariablePayFixedMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 0 unm_NotionalAmountOfDerivativesAdditions / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveVariablePayFixedMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember
Terminations | 0 unm_NotionalAmountOfDerivativesTerminations / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveVariablePayFixedMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 24.0 unm_NotionalAmountOfDerivativesTerminations / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveVariablePayFixedMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 0 unm_NotionalAmountOfDerivativesTerminations / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveVariablePayFixedMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember
Balance at ending of period | 150.0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveVariablePayFixedMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 150.0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveVariablePayFixedMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 174.0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveVariablePayFixedMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember
Swaps | Receive Fixed/Pay Fixed |  |  |
Derivative |  |  |
Balance at beginning of period | 630.4 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayFixedMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 508.8 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayFixedMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 554.0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayFixedMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember
Additions | 250.1 unm_NotionalAmountOfDerivativesAdditions / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayFixedMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 160.0 unm_NotionalAmountOfDerivativesAdditions / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayFixedMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 0 unm_NotionalAmountOfDerivativesAdditions / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayFixedMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember
Terminations | 40.1 unm_NotionalAmountOfDerivativesTerminations / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayFixedMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 38.4 unm_NotionalAmountOfDerivativesTerminations / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayFixedMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 45.2 unm_NotionalAmountOfDerivativesTerminations / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayFixedMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember
Balance at ending of period | 840.4 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayFixedMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 630.4 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayFixedMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 508.8 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayFixedMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember
Swaps | Receive Fixed/Pay Variable |  |  |
Derivative |  |  |
Balance at beginning of period | 600.0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayVariableMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 750.0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayVariableMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 685.0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayVariableMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember
Additions | 0 unm_NotionalAmountOfDerivativesAdditions / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayVariableMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 0 unm_NotionalAmountOfDerivativesAdditions / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayVariableMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 250.0 unm_NotionalAmountOfDerivativesAdditions / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayVariableMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember
Terminations | 0 unm_NotionalAmountOfDerivativesTerminations / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayVariableMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 150.0 unm_NotionalAmountOfDerivativesTerminations / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayVariableMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 185.0 unm_NotionalAmountOfDerivativesTerminations / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayVariableMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember
Balance at ending of period | 600.0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayVariableMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 600.0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayVariableMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember | 750.0 invest_DerivativeNotionalAmount / us-gaap_CreditDerivativesByContractTypeAxis = unm_DerivativeFinancialInstrumentsReceiveFixedPayVariableMember / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember
Forwards |  |  |
Derivative |  |  |
Balance at beginning of period | 0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember | 0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember | 0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember
Additions | 68.0 unm_NotionalAmountOfDerivativesAdditions / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember | 24.0 unm_NotionalAmountOfDerivativesAdditions / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember | 86.0 unm_NotionalAmountOfDerivativesAdditions / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember
Terminations | 68.0 unm_NotionalAmountOfDerivativesTerminations / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember | 24.0 unm_NotionalAmountOfDerivativesTerminations / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember | 86.0 unm_NotionalAmountOfDerivativesTerminations / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember
Balance at ending of period | 0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember | 0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember | 0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember
Options Held |  |  |
Derivative |  |  |
Balance at beginning of period | 0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_OptionMember | 0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_OptionMember | 0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_OptionMember
Additions | 0 unm_NotionalAmountOfDerivativesAdditions / us-gaap_DerivativeByNatureAxis = us-gaap_OptionMember | 10.0 unm_NotionalAmountOfDerivativesAdditions / us-gaap_DerivativeByNatureAxis = us-gaap_OptionMember | 0 unm_NotionalAmountOfDerivativesAdditions / us-gaap_DerivativeByNatureAxis = us-gaap_OptionMember
Terminations | 0 unm_NotionalAmountOfDerivativesTerminations / us-gaap_DerivativeByNatureAxis = us-gaap_OptionMember | 10.0 unm_NotionalAmountOfDerivativesTerminations / us-gaap_DerivativeByNatureAxis = us-gaap_OptionMember | 0 unm_NotionalAmountOfDerivativesTerminations / us-gaap_DerivativeByNatureAxis = us-gaap_OptionMember
Balance at ending of period | $ 0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_OptionMember | $ 0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_OptionMember | $ 0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_OptionMember

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Notional Amount Of Derivatives, Additions + References No definition available. + Details
Name: | unm_NotionalAmountOfDerivativesAdditions
Namespace Prefix: | unm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Notional Amount Of Derivatives, Terminations + References No definition available. + Details
Name: | unm_NotionalAmountOfDerivativesTerminations
Namespace Prefix: | unm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_CreditDerivativesByContractTypeAxis=us-gaap_CreditDefaultSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeByNatureAxis=us-gaap_ForwardContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeByNatureAxis=us-gaap_OptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeByNatureAxis=us-gaap_SwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |