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Investments Distribution by External Credit Rating for Fixed Maturity Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 39,946.0 $ 43,336.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 3,205.3  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 924.9  
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 $ 37,423.1  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 3,132.0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 878.9  
Fixed maturity securities in unrealized loss position percent of total 95.00%  
External Credit Rating, Below-Investment-Grade    
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 2,522.9  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 73.3  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 46.0  
Fixed maturity securities in unrealized loss position percent of total 5.00%