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SCHEDULE II. CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Balance Sheets Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Condensed Financial Statements, Captions [Line Items]    
Fixed maturity investments trading, amortized cost $ 23,750,540 $ 20,872,450
Short-term investments, amortized cost $ 4,532,166 $ 4,603,340
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) 50,180,987 52,693,887
Common shares, shares outstanding (in shares) 50,180,987 52,693,887
Parent Company    
Condensed Financial Statements, Captions [Line Items]    
Fixed maturity investments trading, amortized cost $ 153,742
Short-term investments, amortized cost $ 131,232 $ 277,917
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) 50,180,987 52,693,887
Common shares, shares outstanding (in shares) 50,180,987 52,693,887