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Consolidated Balance Sheets Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Statement of Financial Position [Abstract]    
Fixed maturity securities, amortized cost $ 20,232,773 $ 18,715,483
Fixed maturity securities, allowance for credit loss 46,412 37,466
Cumulative effect adjustment resulting from changes in accounting principles 4,009 1,791
Cumulative effect adjustment resulting from changes in accounting principles 33,602 30,660
Reinsurance recoverable, allowance for credit loss $ 9,443 $ 8,064
Preferred stock, par value (in dollars per share) $ 0.10 $ 0.10
Preferred stock issued (in shares) 5,000,000 5,000,000
Preferred stock outstanding (in shares) 0 0
Common stock, par value (in dollar per share) $ 0.20 $ 0.20
Common shares authorized (in shares)   1,250,000,000
Common shares issued (in shares) 258,043,531 264,546,100
Common shares outstanding (in shares) 258,043,531 264,546,100
Treasury stock issued at cost (in shares) 270,971,091 264,468,528