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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Statement of Financial Position [Abstract]    
Fixed maturity investments trading, amortized cost $ 23,554,856 $ 23,750,540
Short-term investments, amortized cost $ 6,018,765 $ 4,532,166
Preference shares, par value (in dollars 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 dollars per share) $ 1.00 $ 1.00
Common shares, shares issued (in shares) 46,501,144 50,180,987
Common shares, shares outstanding (in shares) 46,501,144 50,180,987