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Investments Distribution by External Credit Rating for Fixed Maturity Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 47,443.7 $ 43,011.7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 6,455.6  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 91.2  
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 $ 44,255.2  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 6,270.8  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 23.5  
Fixed maturity securities in unrealized loss position percent of total 25.80%  
External Credit Rating, Below-Investment-Grade    
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 3,188.5  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 184.8  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 67.7  
Fixed maturity securities in unrealized loss position percent of total 74.20%