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Investments Investments - Net Realized Gains on Sales of Investments (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Fixed Maturities [Member]    
Net Investment Income [Line Items]    
Gains on Sales $ 2.0us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember		 $ 4.4us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
Losses on Sales (0.1)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember		 0us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedMaturitiesMember
Equity Securities [Member]    
Net Investment Income [Line Items]    
Gains on Sales 1.5us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember		 0.8us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
Losses on Sales $ 0us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember		 $ 0us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember