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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator:        
Net (loss) income (attributable) available to RenaissanceRe common shareholders $ (450,222) $ 47,799 $ (284,338) $ 541,670
Amount allocated to participating common shareholders (229) (582) (485) (6,677)
Net (loss) income allocated to RenaissanceRe common shareholders $ (450,451) $ 47,217 $ (284,823) $ 534,993
Denominator:        
Denominator for basic (loss) income per RenaissanceRe common share - weighted average common shares (in shares) 46,223 50,009 47,988 46,130
Per common share equivalents of non-vested shares (in shares) 0 85 0 70
Denominator for diluted (loss) income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions (in shares) 46,223 50,094 47,988 46,200
Net (loss) income (attributable) available to RenaissanceRe common shareholders per common share – basic Section Page Break (in dollars per share) $ (9.75) $ 0.94 $ (5.94) $ 11.60
Net (loss) income (attributable) available to RenaissanceRe common shareholders per common share – diluted (in dollars per share) $ (9.75) $ 0.94 $ (5.94) $ 11.58