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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, 2021
Mar. 31, 2020
Numerator:    
Net loss attributable to RenaissanceRe common shareholders $ (290,934) $ (81,974)
Amount allocated to participating common shareholders (129) (146)
Net loss allocated to RenaissanceRe common shareholders $ (291,063) $ (82,120)
Denominator:    
Denominator for basic loss per RenaissanceRe common share - weighted average common shares 49,579 43,441
Per common share equivalents of employee stock options and non-vested shares 0 0
Denominator for diluted loss per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions 49,579 43,441
Net loss attributable to RenaissanceRe common shareholders per common share – basic (in dollars per share) $ (5.87) $ (1.89)
Net loss attributable to RenaissanceRe common shareholders per common share – diluted (in dollars per share) $ (5.87) $ (1.89)