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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands	Sep. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Fixed maturities, available for sale, amortized cost	$ 12,202,767,000	$ 11,566,930,000
Fixed maturities, available for sale, allowance for credit loss	399,000	323,000
Fixed maturities, held to maturity, fair value	416,821,000	0
Fixed maturities, held to maturity, allowance for credit loss	0
Equity securities, cost	510,891,000	421,744,000
Credit losses associated with commercial mortgage loans	0	0
Allowance for expected credit losses on insurance and reinsurance premium balances receivable	8,903,000	8,836,000
Allowance for expected credit losses on reinsurance recoverable for unpaid losses and loss expenses	$ 27,087,000	$ 23,711,000
Common shares, shares issued (in shares)	176,580	176,580
Common shares, shares outstanding (in shares)	84,773	84,353
Treasury shares, shares (in shares)	91,807	92,227

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