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Investments Distribution by External Credit Rating for Fixed Maturity Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 42,076.0 $ 44,137.3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 5,695.1  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 177.7  
Fixed maturity securities in unrealized loss position percent of total 100.00%  
External Credit Rating, Investment Grade    
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 38,846.3  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 5,451.1  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 149.9  
Fixed maturity securities in unrealized loss position percent of total 84.40%  
External Credit Rating, Below-Investment-Grade    
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 3,229.7  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 244.0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 27.8  
Fixed maturity securities in unrealized loss position percent of total 15.60%