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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Numerator:        
Net income (loss) available (attributable) to RenaissanceRe common shareholders $ (324,913) $ 456,818 $ (719,326) $ 165,884
Amount allocated to participating common shareholders (272) (5,809) (507) (1,864)
Net income (loss) allocated to RenaissanceRe common shareholders $ (325,185) $ 451,009 $ (719,833) $ 164,020
Denominator:        
Denominator for basic income (loss) per RenaissanceRe common share - weighted average common shares (in shares) 43,170 48,163 43,264 48,871
Per common share equivalents of non-vested shares (in shares) 0 63 0 69
Denominator for diluted income (loss) per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions (in shares) 43,170 48,226 43,264 48,940
Net income (loss) available (attributable) to RenaissanceRe common shareholders per common share – basic (in dollars per share) $ (7.53) $ 9.36 $ (16.64) $ 3.36
Net income (loss) available (attributable) to RenaissanceRe common shareholders per common share – diluted (in dollars per share) $ (7.53) $ 9.35 $ (16.64) $ 3.35