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Investments - Amortized Costs and Estimated Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Amortized Cost    
Due in One Year or Less $ 228.2  
Due after One Year to Five Years 925.2  
Due after Five Years to Ten Years 920.7  
Due after Ten Years 3,497.9  
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date 1,759.7  
Fixed maturities, at amortized cost 7,331.7 $ 7,295.0
Fair Value    
Due in One Year or Less 225.8  
Due after One Year to Five Years 894.4  
Due after Five Years to Ten Years 839.7  
Due after Ten Years 3,001.5  
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date 1,658.9  
Fair Value $ 6,620.3 $ 6,409.6