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Schedule II. Condensed Financial Information Of Registrant - Balance Sheets Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items]    
Fixed maturity investments trading, amortized cost $ 20,872,450 $ 15,038,551
Short-term investments, amortized cost $ 4,603,340 $ 4,671,581
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) 52,693,887 43,717,836
Common shares, shares outstanding (in shares) 52,693,887 43,717,836
Parent Company    
Condensed Financial Statements, Captions [Line Items]    
Fixed maturity investments trading, amortized cost $ 0 $ 176,084
Short-term investments, amortized cost $ 277,917 $ 61,747
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) 52,693,887 43,717,836
Common shares, shares outstanding (in shares) 52,693,887 43,717,836