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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
shares in Thousands
Mar. 31, 2022
Dec. 31, 2021
Statement of Financial Position [Abstract]    
Fixed maturities, available for sale, amortized cost $ 11,840,101,000 $ 12,241,782,000
Fixed maturities, available for sale, allowance for credit loss 383,000 313,000
Fixed maturities, held to maturity, fair value 486,432,000 445,033,000
Fixed maturities, held to maturity, allowance for credit loss 0 0
Equity securities, cost 480,759,000 528,864,000
Credit losses associated with commercial mortgage loans 0 0
Allowance for expected credit losses on insurance and reinsurance premium balances receivable 9,385,000 7,567,000
Allowance for expected credit losses on reinsurance recoverable for unpaid losses and loss expenses $ 28,792,000 $ 29,554,000
Common shares, shares issued (in shares) 176,580 176,580
Common shares, shares outstanding (in shares) 85,276 84,774
Treasury shares, shares (in shares) 91,304 91,806