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Investment Securities (Investment Holdings) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
U.S. Government and agency obligations    
Investment securities    
Cost or amortized cost $ 154.0 $ 297.8
Gross unrealized gains 0.1 0.0
Gross unrealized losses (0.9) (1.3)
Net foreign currency gains 0.0 0.0
Fixed maturity investments, at fair value 153.2 296.5
Debt securities issued by corporations    
Investment securities    
Cost or amortized cost 519.0 867.6
Gross unrealized gains 1.0 2.9
Gross unrealized losses (9.5) (4.3)
Net foreign currency gains 0.0 14.7
Fixed maturity investments, at fair value 510.5 880.9
Mortgage and asset-backed securities    
Investment securities    
Cost or amortized cost 136.1 697.2
Gross unrealized gains 0.1 1.6
Gross unrealized losses (2.7) (4.1)
Net foreign currency gains 0.0 0.0
Fixed maturity investments, at fair value 133.5 694.7
Municipal obligations    
Investment securities    
Cost or amortized cost 279.0 252.0
Gross unrealized gains 2.4 3.7
Gross unrealized losses (1.1) (0.8)
Net foreign currency gains 0.0 0.0
Fixed maturity investments, at fair value 280.3 254.9
Foreign government, agency and provincial obligations    
Investment securities    
Cost or amortized cost   2.6
Gross unrealized gains   0.0
Gross unrealized losses   0.0
Net foreign currency gains   0.1
Fixed maturity investments, at fair value   2.7
Total fixed maturity investments    
Investment securities    
Cost or amortized cost 1,088.1 2,117.2
Gross unrealized gains 3.6 8.2
Gross unrealized losses (14.2) (10.5)
Net foreign currency gains 0.0 14.8
Total fixed maturity investments $ 1,077.5 $ 2,129.7
Including Short Term Fixed    
Investment securities    
Duration of fixed maturities (years) 3 years 5 months  
Excluding Short Term Investments    
Investment securities    
Duration of fixed maturities (years) 4 years