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Investments - Schedule of Contractual Maturity (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Amortized Cost    
Due in One Year or Less $ 109.0  
Due after One Year to Five Years 998.3  
Due after Five Years to Ten Years 1,469.1  
Due after Ten Years 3,255.6  
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date 1,526.2  
Amortized Cost 7,358.2 $ 6,692.7
Fair Value    
Due in One Year or Less 111.4  
Due after One Year to Five Years 1,044.2  
Due after Five Years to Ten Years 1,555.9  
Due after Ten Years 3,730.1  
Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date 1,545.3  
Investments in Fixed Maturities $ 7,986.9 $ 7,605.9