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Investments Distribution by External Credit Rating for Fixed Maturity Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 43,336.0 $ 44,137.3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 6,049.4  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 100.1  
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 $ 40,359.0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 5,814.9  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 88.4  
Fixed maturity securities in unrealized loss position percent of total 88.30%  
External Credit Rating, Below-Investment-Grade    
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 2,977.0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 234.5  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 11.7  
Fixed maturity securities in unrealized loss position percent of total 11.70%