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Investments - Amortization by Expected Maturity (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Amortized cost of fixed maturities available-for-sale    
Due in one year or less $ 1,658.8  
Due after one year through five years 8,661.8  
Due after five years through ten years 11,636.1  
Due after ten years 28,371.2  
Subtotal 50,327.9  
Mortgage-backed and other asset-backed securities 19,935.2  
Amortized cost, fixed maturities 70,263.1 $ 72,869.9
Fair value of fixed maturities available-for-sale    
Due in one year or less 1,645.6  
Due after one year through five years 8,328.4  
Due after five years through ten years 10,626.7  
Due after ten years 24,121.9  
Subtotal 44,722.6  
Mortgage-backed and other asset-backed securities 18,167.3  
Fair value, fixed maturities $ 62,889.9 $ 78,154.5