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Investments - Amortization by Expected Maturity (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Amortized cost of fixed maturities available-for-sale    
Due in one year or less $ 1,298.4  
Due after one year through five years 8,486.2  
Due after five years through ten years 9,209.3  
Due after ten years 26,448.9  
Subtotal 45,442.8  
Mortgage-backed and other asset-backed securities 22,178.2  
Amortized cost, fixed maturities 67,621.0 $ 67,103.9
Fair value of fixed maturities available-for-sale    
Due in one year or less 1,282.2  
Due after one year through five years 8,285.1  
Due after five years through ten years 8,675.0  
Due after ten years 23,435.3  
Subtotal 41,677.6  
Mortgage-backed and other asset-backed securities 20,852.6  
Fair value, fixed maturities $ 62,530.2 $ 59,631.3