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CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Investments:    
Fixed maturities, available for sale, allowance for credit losses $ 38.9 $ 37.1
Fixed maturities, available for sale, amortized cost 25,471.1 25,264.3
Mortgage loans, allowance for credit losses 20.1 13.6
Investments held by variable interest entities, allowance for credit losses 2.5 1.3
Investments held by variable interest entities, amortized cost 387.1 437.0
Reinsurance receivables, allowance for current expected credit losses $ 3.0 $ 3.0
Shareholders' equity:    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 8,000,000,000 8,000,000,000
Common stock, shares issued (in shares) 99,893,923 101,618,957
Common stock, shares outstanding (in shares) 99,893,923 101,618,957