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CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Investments:    
Fixed maturities, available for sale, allowance for credit losses $ 33.0 $ 37.1
Fixed maturities, available for sale, amortized cost 25,219.3 25,151.0
Mortgage loans, allowance for credit losses 21.0 13.6
Investments held by variable interest entities, allowance for credit losses 0.5 1.3
Investments held by variable interest entities, amortized cost 298.6 437.0
Reinsurance receivables, allowance for current expected credit losses $ 1.0 $ 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) 95,840,989 101,618,957
Common stock, shares outstanding (in shares) 95,840,989 101,618,957