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Long-Term Debt (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]      
Debt instrument, face amount $ 252.9us-gaap_DebtInstrumentFaceAmount    
Debt instrument, interest rate, stated percentage 6.90%us-gaap_DebtInstrumentInterestRateStatedPercentage    
Repayment of senior debt 47.1us-gaap_RepaymentsOfSeniorDebt 0us-gaap_RepaymentsOfSeniorDebt 250.0us-gaap_RepaymentsOfSeniorDebt
Junior Subordinated Debt [Member]      
Debt Instrument [Line Items]      
Debt instrument, face amount 252.9us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember		    
Debt instrument, interest rate, stated percentage 6.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember		    
Debt instrument, maturity date Jun. 01, 2067    
Debt instrument, non-callable at par, years 10 years 0 months 0 days    
Debt instrument, call date, earliest Jun. 01, 2017    
Debt instrument, term of stated percentage, initial years 10 years 0 months 0 days    
Debt Instrument, Description of Variable Rate Basis LIBOR    
Debt instrument, floating interest rate base to be added to three-month LIBOR. 2.51%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember		    
Debt instrument, option to defer interest payments, years 5 years 0 months 0 days    
Senior Notes 2022 [Member]      
Debt Instrument [Line Items]      
Debt issuance date Aug. 10, 2012    
Debt instrument, face amount $ 250.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Debt instrument, interest rate, stated percentage 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Debt instrument, maturity date Aug. 15, 2022