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, 2023	Mar. 31, 2022
Numerator:
Net income (loss) available (attributable) to RenaissanceRe common shareholders	$ 564,062	$ (394,413)
Amount allocated to participating common shareholders	(8,854)	(235)
Net income (loss) allocated to RenaissanceRe common shareholders	$ 555,208	$ (394,648)
Denominator:
Denominator for basic income (loss) per RenaissanceRe common share - weighted average common shares (in shares)	42,876	43,357
Per common share equivalents of non-vested shares (in shares)	130	0
Denominator for diluted income (loss) per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions (in shares)	43,006	43,357
Net income (loss) available (attributable) to RenaissanceRe common shareholders per common share – basic (in dollars per share)	$ 12.95	$ (9.10)
Net income (loss) available (attributable) to RenaissanceRe common shareholders per common share – diluted (in dollars per share)	$ 12.91	$ (9.10)