Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Fixed maturity investments trading, amortized cost	$ 15,038,551	$ 13,552,579
Short-term investments, amortized cost	$ 4,671,581	$ 5,298,385
Preference shares, par value (in usd per share)	$ 1.00	$ 1.00
Preference shares, shares issued (in shares)	30,000	30,000
Preference shares, shares outstanding (in shares)	30,000	30,000
Common shares, par value (in usd per share)	$ 1.00	$ 1.00
Common shares, shares issued (in shares)	43,717,836	44,444,831
Common shares, shares outstanding (in shares)	43,717,836	44,444,831

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Amortized cost of investments in debt securities classified as trading.

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