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Gains and Losses on DerivativesNot Designated as Hedging Instruments (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net Realized Investment Gain (Loss) |  |  |
Derivative, Gain (Loss) on Derivative, Net | $ 11.0 us-gaap_DerivativeGainLossOnDerivativeNet | $ (1.9)us-gaap_DerivativeGainLossOnDerivativeNet | $ 0 us-gaap_DerivativeGainLossOnDerivativeNet
Not Designated as Hedging Instrument |  |  |
Net Realized Investment Gain (Loss) |  |  |
Derivative, Gain (Loss) on Derivative, Net | 1.2 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 28.8 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 51.8 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Not Designated as Hedging Instrument | Credit Default Swaps |  |  |
Net Realized Investment Gain (Loss) |  |  |
Derivative, Gain (Loss) on Derivative, Net | (0.3)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | (1.9)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Not Designated as Hedging Instrument | Foreign Exchange Contracts |  |  |
Net Realized Investment Gain (Loss) |  |  |
Derivative, Gain (Loss) on Derivative, Net | (1.8)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Not Designated as Hedging Instrument | Embedded Derivative in Modified Coinsurance Arrangement |  |  |
Net Realized Investment Gain (Loss) |  |  |
Derivative, Gain (Loss) on Derivative, Net | $ 3.3 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ 30.7 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ 51.8 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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