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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Numerator:      
Net income (loss) available (attributable) to RenaissanceRe common shareholders $ (73,421) $ 731,482 $ 712,042
Amount allocated to participating common shareholders (727) (8,968) (8,545)
Net income (loss) allocated to RenaissanceRe common shareholders $ (74,148) $ 722,514 $ 703,497
Denominator:      
Denominator for basic income (loss) per RenaissanceRe common share - weighted average common shares (in shares) 47,171 47,103 43,119
Per common share equivalents of non-vested shares (in shares) 0 75 56
Denominator for diluted income (loss) per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions (in shares) 47,171 47,178 43,175
Net (loss) income (attributable) available to RenaissanceRe common shareholders per common share – basic (in usd per share) $ (1.57) $ 15.34 $ 16.32
Net (loss) income (attributable) available to RenaissanceRe common shareholders per common share – diluted (in usd per share) $ (1.57) $ 15.31 $ 16.29