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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
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Numerator:        
Net income (loss) available (attributable) to RenaissanceRe common shareholders $ (825,344) $ (450,222) $ (1,544,670) $ (284,338)
Amount allocated to participating common shareholders (306) (229) (813) (485)
Net income (loss) allocated to RenaissanceRe common shareholders $ (825,650) $ (450,451) $ (1,545,483) $ (284,823)
Denominator:        
Denominator for basic income (loss) per RenaissanceRe common share - weighted average common shares (in shares) 42,837 46,223 43,121 47,988
Per common share equivalents of non-vested shares (in shares) 0 0 0 0
Denominator for diluted income (loss) per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions (in shares) 42,837 46,223 43,121 47,988
Net income (loss) available (attributable) to RenaissanceRe common shareholders per common share – basic (in dollars per share) $ (19.27) $ (9.75) $ (35.84) $ (5.94)
Net income (loss) available (attributable) to RenaissanceRe common shareholders per common share – diluted (in dollars per share) $ (19.27) $ (9.75) $ (35.84) $ (5.94)
Potentially dilutive securities (in shares) 94   81