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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Numerator:      
Net income (loss) available (attributable) to RenaissanceRe common shareholders $ 1,834,985 $ 2,525,757 $ (1,096,578)
Amount allocated to participating common shareholders (27,472) (37,308) (1,079)
Net income (loss) allocated to RenaissanceRe common shareholders $ 1,807,513 $ 2,488,449 $ (1,097,657)
Denominator:      
Denominator for basic income (loss) per RenaissanceRe common share - weighted average common shares (in shares) 51,186 47,493 43,040
Per common share equivalents of non-vested shares (in shares) 153 114 0
Denominator for diluted income (loss) per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions (in shares) 51,339 47,607 43,040
Net income (loss) available (attributable) to RenaissanceRe common shareholders per common share – basic (in dollars per share) $ 35.31 $ 52.40 $ (25.50)
Net income (loss) available (attributable) to RenaissanceRe common shareholders per common share – diluted (in dollars per share) $ 35.21 $ 52.27 $ (25.50)
Potentially dilutive securities (in shares)     90