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Investments - Schedule of Net Realized and Unrealized Gains (Losses) on Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Gain (Loss) on Securities [Line Items]      
Net realized and unrealized gains (losses) on fixed maturity investments trading $ 292,054 $ (1,369,323) $ (309,788)
Net realized and unrealized gains (losses) on equity investments 45,751 (123,788) 49,609
Net realized and unrealized gains (losses) on investments 414,522 (1,800,485) (218,134)
Fixed maturity investments trading      
Gain (Loss) on Securities [Line Items]      
Net realized gains (losses) on fixed maturity investments trading (393,041) (732,561) 79,588
Net unrealized gains (losses) on fixed maturity investments trading 685,095 (636,762) (389,376)
Investments-related derivatives      
Gain (Loss) on Securities [Line Items]      
Net realized and unrealized gains (losses) on investments-related derivatives (68,272) (165,293) (12,237)
Equity investments      
Gain (Loss) on Securities [Line Items]      
Net realized gains (losses) on equity investments (27,492) 43,035 335,491
Net unrealized gains (losses) on equity investments 73,243 (166,823) (285,882)
Catastrophe bonds      
Gain (Loss) on Securities [Line Items]      
Net realized and unrealized gains (losses) on other investments 101,897 (130,335) (35,033)
Other      
Gain (Loss) on Securities [Line Items]      
Net realized and unrealized gains (losses) on other investments $ 43,092 $ (11,746) $ 89,315