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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
Mar. 31, 2022
Mar. 31, 2021
Numerator:    
Net income (loss) available (attributable) to RenaissanceRe common shareholders $ (394,413) $ (290,934)
Amount allocated to participating common shareholders (235) (129)
Net income (loss) allocated to RenaissanceRe common shareholders $ (394,648) $ (291,063)
Denominator:    
Denominator for basic (loss) income per RenaissanceRe common share - weighted average common shares (in shares) 43,357 49,579
Per common share equivalents of non-vested shares (in shares) 0 0
Denominator for diluted (loss) income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions (in shares) 43,357 49,579
Net income (loss) available (attributable) to RenaissanceRe common shareholders per common share – basic (in dollars per share) $ (9.10) $ (5.87)
Net income (loss) available (attributable) to RenaissanceRe common shareholders per common share – diluted (in dollars per share) $ (9.10) $ (5.87)