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Schedule II. Condensed Financial Information Of Registrant (Balance Sheets Additional Information) (Details) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]    
Fixed maturity investments trading, amortized cost $ 13,552,579 $ 13,155,035
Preference shares, par value (in usd per share) $ 1.00 $ 1.00
Preference shares, shares issued (in shares) 30,000 11,010,000
Preference shares, shares outstanding (in shares) 30,000 11,010,000
Common shares, par value (in usd per share) $ 1.00 $ 1.00
Common shares, shares issued (in shares) 44,444,831 50,810,618
Common shares, shares outstanding (in shares) 44,444,831 50,810,618
Parent Company    
Condensed Financial Statements, Captions [Line Items]    
Fixed maturity investments trading, amortized cost $ 0 $ 14,840
Preference shares, par value (in usd per share) $ 1.00 $ 1.00
Preference shares, shares issued (in shares) 30,000 11,010,000
Preference shares, shares outstanding (in shares) 30,000 11,010,000
Common shares, par value (in usd per share) $ 1.00 $ 1.00
Common shares, shares issued (in shares) 44,444,831 50,810,618
Common shares, shares outstanding (in shares) 44,444,831 50,810,618