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Investments Distribution by External Credit Rating for Fixed Maturity Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 49,270.2 $ 47,443.7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 8,177.1  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 146.3  
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 $ 45,668.1  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 7,987.3  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 32.7  
Fixed maturity securities in unrealized loss position percent of total 22.40%  
External Credit Rating, Below-Investment-Grade    
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 3,602.1  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 189.8  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 113.6  
Fixed maturity securities in unrealized loss position percent of total 77.60%