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CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Investments:    
Fixed maturities, available for sale, allowance for credit losses $ 37.1 $ 42.9
Fixed maturities, available for sale, amortized cost 25,264.3 23,699.2
Mortgage loans, allowance for credit losses 13.6 15.4
Investments held by variable interest entities, allowance for credit losses 1.3 3.1
Investments held by variable interest entities, amortized cost 437.0 787.6
Reinsurance receivables, allowance for credit losses $ 3.0 $ 3.0
Shareholders' equity:    
Common stock, par value (in USD 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) 101,618,957 109,357,540
Common stock, shares outstanding (in shares) 101,618,957 109,357,540