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Consolidated Balance Sheets Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Statement of Financial Position [Abstract]    
Fixed maturity securities, amortized cost $ 21,775,516 $ 20,915,245
Fixed maturity securities, allowance for credit loss 22,869 36,751
Cumulative effect adjustment resulting from changes in accounting principles 2,609 3,004
Cumulative effect adjustment resulting from changes in accounting principles 35,039 35,110
Reinsurance recoverable, allowance for credit loss $ 9,185 $ 8,404
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) 256,548,669 256,544,757
Common shares outstanding (in shares) 256,548,669 256,544,757
Treasury stock issued at cost (in shares) 272,465,959 272,469,871