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Investments Available for Sale Debt Securities by External Credit Rating (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 47,435.0 $ 43,011.7
Accumulated Gross Unrealized Gain on Securities 6,763.6 3,492.9
Accumulated Gross Unrealized Loss on Securities $ 118.3 $ 756.4
Percent of Fixed Maturity Securities in Unrealized Loss Position 100.00%  
External Credit Rating, Investment Grade    
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 44,372.4  
Accumulated Gross Unrealized Gain on Securities 6,609.3  
Accumulated Gross Unrealized Loss on Securities $ 17.7  
Percent of Fixed Maturity Securities in Unrealized Loss Position 15.00%  
External Credit Rating, Below-Investment-Grade    
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 3,062.6  
Accumulated Gross Unrealized Gain on Securities 154.3  
Accumulated Gross Unrealized Loss on Securities $ 100.6  
Percent of Fixed Maturity Securities in Unrealized Loss Position 85.00%