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Investments - Amortized Costs and Estimated Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Amortized Cost    
Due in One Year or Less $ 118.4  
Due after One Year to Five Years 1,026.6  
Due after Five Years to Ten Years 1,575.5  
Due after Ten Years 2,549.2  
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date 1,465.6  
Investments in Fixed Maturities 6,735.3 $ 6,372.7
Fair Value    
Due in One Year or Less 119.3  
Due after One Year to Five Years 1,068.8  
Due after Five Years to Ten Years 1,751.1  
Due after Ten Years 3,072.4  
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date 1,468.8  
Investments in Fixed Maturities $ 7,480.4 $ 6,922.1