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Investment Securities (Investment Holdings) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Investment securities    
Fixed maturity investments, at fair value $ 2,639.7 $ 2,422.0
Including Short Term Fixed    
Investment securities    
Duration of Fixed Maturities 2 years 2 months 12 days  
US Government and agency obligations    
Investment securities    
Trading Securities, Cost $ 160.4 105.4
Net foreign currency gains (losses) 0.0 0.0
Fixed maturity investments, at fair value 160.0 105.2
Trading Securities, Unrealized Holding Gain 0.0 0.1
Trading Securities, Unrealized Holding Loss (0.4) (0.3)
Debt securities issued by corporations    
Investment securities    
Trading Securities, Cost 1,001.0 1,162.0
Net foreign currency gains (losses) 0.0 0.0
Fixed maturity investments, at fair value 1,000.0 1,171.7
Trading Securities, Unrealized Holding Gain 4.3 13.1
Trading Securities, Unrealized Holding Loss (5.3) (3.4)
Municipal obligations    
Investment securities    
Trading Securities, Cost 227.8 81.0
Net foreign currency gains (losses) 0.0 0.0
Fixed maturity investments, at fair value 228.8 82.2
Trading Securities, Unrealized Holding Gain 2.2 1.4
Trading Securities, Unrealized Holding Loss (1.2) (0.2)
Mortgage-backed and asset-backed securities    
Investment securities    
Trading Securities, Cost 1,170.6 967.5
Net foreign currency gains (losses) 0.0 0.0
Fixed maturity investments, at fair value 1,167.0 967.9
Trading Securities, Unrealized Holding Gain 2.0 2.8
Trading Securities, Unrealized Holding Loss (5.6) (2.4)
Foreign government, agency and provincial obligations    
Investment securities    
Trading Securities, Cost 1.0 11.5
Net foreign currency gains (losses) 0.0 0.0
Fixed maturity investments, at fair value 1.2 10.8
Trading Securities, Unrealized Holding Gain 0.2 0.3
Trading Securities, Unrealized Holding Loss 0.0 (1.0)
Preferred stocks    
Investment securities    
Trading Securities, Cost 78.3 78.3
Net foreign currency gains (losses) 0.0 0.0
Fixed maturity investments, at fair value 82.7 84.2
Trading Securities, Unrealized Holding Gain 4.4 5.9
Trading Securities, Unrealized Holding Loss 0.0 0.0
Fixed Income Investments [Member]    
Investment securities    
Trading Securities, Cost 2,639.1 2,405.7
Net foreign currency gains (losses) 0.0 0.0
Total fixed maturity investments 2,639.7 2,422.0
Trading Securities, Unrealized Holding Gain 13.1 23.6
Trading Securities, Unrealized Holding Loss $ (12.5) $ (7.3)
Excluding Short Term Investments    
Investment securities    
Duration of Fixed Maturities 2 years 4 months 24 days