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Investments, Amortized Cost and Estimated Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Amortized Cost    
Due in one year or less, amortized cost $ 127.1  
Due after one year through five years, amortized cost 665.5  
Due after five years through ten years, amortized cost 759.1  
Due after ten years, amortized cost 116.2  
Mortgage and asset-backed securities, amortized cost 665.7  
Debt securities, available-for-sale, amortized cost 2,333.6 $ 2,403.3
Estimated Fair Value    
Due in one year or less, fair value 128.8  
Due after one year through five years, fair value 707.8  
Due after five years through ten years, fair value 829.6  
Due after ten years, fair value 123.4  
Mortgage and asset-backed securities, fair value 689.6  
Fixed maturity securities, fair value $ 2,479.2 $ 2,485.9