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CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Investments:    
Fixed maturities, available for sale, allowance for credit losses $ 69.4 $ 56.0
Fixed maturities, available for sale, amortized cost 23,899.5 23,384.2
Mortgage loans, allowance for credit losses 10.9 8.0
Investments held by variable interest entities, allowance for credit losses 2.9 5.5
Investments held by variable interest entities, amortized cost 880.6 1,134.2
Reinsurance receivables, allowance for current expected credit losses $ 3.0 $ 2.0
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) 112,163,169 114,343,070
Common stock, shares outstanding (in shares) 112,163,169 114,343,070