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Investments - Amortization by Expected Maturity (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Amortized cost of fixed maturities available-for-sale    
Due in one year or less $ 2,336.5  
Due after one year through five years 10,831.5  
Due after five years through ten years 14,032.7  
Due after ten years 24,868.8  
Subtotal 52,069.5  
Mortgage-backed and other asset-backed securities 18,477.3  
Amortized cost, fixed maturities 70,546.8 $ 65,302.5
Fair value of fixed maturities available-for-sale    
Due in one year or less 2,372.9  
Due after one year through five years 11,570.0  
Due after five years through ten years 15,601.5  
Due after ten years 30,163.4  
Subtotal 59,707.8  
Mortgage-backed and other asset-backed securities 19,002.5  
Fair value, fixed maturities $ 78,710.3 $ 70,106.2