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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Fixed maturity investments trading, amortized cost	$ 13,258,985	$ 13,155,035
Preference shares, par value (In dollars per share)	$ 1.00	$ 1.00
Preference shares, shares issued (In shares)	11,010,000	11,010,000
Preference shares, shares outstanding (in shares)	11,010,000	11,010,000
Common shares, par value (In dollars per share)	$ 1.00	$ 1.00
Common shares, shares issued (In shares)	49,969,717	50,810,618
Common shares, shares outstanding (In shares)	49,969,717	50,810,618

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Face amount or stated value per share of common stock.

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