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Investments Composition of Fixed Maturities by Maturity (Parenthetical) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Open interest rate swap positions $ 15.8us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet [1] $ 68.1us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet [1]
Interest Rate Swaps    
Schedule of Available-for-sale Securities [Line Items]    
Open interest rate swap positions $ 15.8us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_InvestmentTypeAxis
= us-gaap_InterestRateSwapMember		  
[1] To the extent we hold both derivative assets and liabilities with the same counterparty that are subject to an enforceable master netting arrangement, we expect that we will report them on a gross basis on our balance sheets, consistent with our historical presentation.