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CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Investments:    
Fixed maturities, available for sale, allowance for credit losses $ 2.3 $ 2.2
Fixed maturities, available for sale, amortized cost 20,698.0 19,921.1
Mortgage loans, allowance for credit losses 8.3 11.8
Investments held by variable interest entities, allowance for credit losses 3.2 15.1
Investments held by variable interest entities, amortized cost 1,239.0 1,211.3
Reinsurance receivables, allowance for current expected credit losses $ 4.0 $ 4.0
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) 129,105,039 135,279,119
Common stock, shares outstanding (in shares) 129,105,039 135,279,119