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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator:        
Net income available to RenaissanceRe common shareholders $ 456,818 $ 575,845 $ 165,884 $ 493,871
Amount allocated to participating common shareholders (5,809) (7,593) (1,864) (6,153)
Net income available to RenaissanceRe common shareholders $ 451,009 $ 568,252 $ 164,020 $ 487,718
Denominator:        
Denominator for basic loss per RenaissanceRe common share - weighted average common shares 48,163 44,939 48,871 44,190
Per common share equivalents of employee stock options and non-vested shares 63 64 69 63
Denominator for diluted loss per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions 48,226 45,003 48,940 44,253
Net income available to RenaissanceRe common shareholders per common share – basic (in dollars per share) $ 9.36 $ 12.64 $ 3.36 $ 11.04
Net income available to RenaissanceRe common shareholders per common share – diluted (in dollars per share) $ 9.35 $ 12.63 $ 3.35 $ 11.02