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Investments Distribution by External Credit Rating for Fixed Maturity Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 43,513.8 $ 44,137.3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 6,663.2  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 60.1  
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 $ 40,361.3  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 6,376.7  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 44.5  
Fixed maturity securities in unrealized loss position percent of total 74.00%  
External Credit Rating, Below-Investment-Grade    
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 3,152.5  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 286.5  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 15.6  
Fixed maturity securities in unrealized loss position percent of total 26.00%