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Investments - Schedule of Carrying Amounts and Fair Values of Available for Sale Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Fixed maturity securities available for sale:    
Cost Basis $ 19.3 $ 18.8
Unrealized Gains 0.8 0.9
Unrealized Losses (1.4) (1.9)
Fair Value 18.7 17.8
Corporate debt securities    
Fixed maturity securities available for sale:    
Cost Basis 19.3 18.8
Unrealized Gains 0.8 0.9
Unrealized Losses (1.4) (1.9)
Fair Value 18.7 17.8
Carrying Value    
Fixed maturity securities available for sale:    
Fair Value 18.7 17.8
Carrying Value | Corporate debt securities    
Fixed maturity securities available for sale:    
Fair Value $ 18.7 $ 17.8