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Investments Available for Sale Debt Securities by External Credit Rating (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 46,440.2 $ 43,011.7
Accumulated Gross Unrealized Gain on Securities 5,783.8 3,492.9
Accumulated Gross Unrealized Loss on Securities $ 148.4 $ 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 $ 43,232.8  
Accumulated Gross Unrealized Gain on Securities 5,664.6  
Accumulated Gross Unrealized Loss on Securities $ 58.5  
Percent of Fixed Maturity Securities in Unrealized Loss Position 39.40%  
External Credit Rating, Below-Investment-Grade    
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 3,207.4  
Accumulated Gross Unrealized Gain on Securities 119.2  
Accumulated Gross Unrealized Loss on Securities $ 89.9  
Percent of Fixed Maturity Securities in Unrealized Loss Position 60.60%