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Investment Securities (Investment Holdings) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
U.S. Government and agency obligations    
Investment securities    
Cost or Amortized Cost $ 231.7 $ 154.0
Gross Unrealized Gains 1.0 0.1
Gross Unrealized Losses (0.2) (0.9)
Fixed maturity investments, at fair value 232.5 153.2
Debt securities issued by corporations    
Investment securities    
Cost or Amortized Cost 454.9 519.0
Gross Unrealized Gains 12.5 1.0
Gross Unrealized Losses (0.2) (9.5)
Fixed maturity investments, at fair value 467.2 510.5
Mortgage and asset-backed securities    
Investment securities    
Cost or Amortized Cost 206.6 279.0
Gross Unrealized Gains 2.7 2.4
Gross Unrealized Losses (0.3) (1.1)
Fixed maturity investments, at fair value 209.0 280.3
Municipal obligations    
Investment securities    
Cost or Amortized Cost 284.7 136.1
Gross Unrealized Gains 12.5 0.1
Gross Unrealized Losses (0.1) (2.7)
Fixed maturity investments, at fair value 297.1 133.5
Total fixed maturity investments    
Investment securities    
Cost or Amortized Cost 1,177.9 1,088.1
Gross Unrealized Gains 28.7 3.6
Gross Unrealized Losses (0.8) (14.2)
Total fixed maturity investments $ 1,205.8 $ 1,077.5
Including Short Term Fixed    
Investment securities    
Duration of fixed maturities (years) 2 years 9 months 18 days  
Excluding Short Term Investments    
Investment securities    
Duration of fixed maturities (years) 3 years 3 months 18 days