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Earnings Per Share - Computation of Basic and Diluted Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Numerator:      
Net income (loss) available (attributable) to RenaissanceRe common shareholders $ 2,525,757 $ (1,096,578) $ (73,421)
Amount allocated to participating common shareholders (37,308) (1,079) (727)
Net income (loss) allocated to RenaissanceRe common shareholders $ 2,488,449 $ (1,097,657) $ (74,148)
Denominator:      
Denominator for basic income (loss) per RenaissanceRe common share - weighted average common shares (in shares) 47,493 43,040 47,171
Per common share equivalents of non-vested shares (in shares) 114 0 0
Denominator for diluted income (loss) per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions (in shares) 47,607 43,040 47,171
Net (loss) income available (attributable) to RenaissanceRe common shareholders per common share – basic (in usd per share) $ 52.40 $ (25.50) $ (1.57)
Net (loss) income available (attributable) to RenaissanceRe common shareholders per common share – diluted (in usd per share) $ 52.27 $ (25.50) $ (1.57)