EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Numerator:
Net income (loss) available (attributable) to RenaissanceRe common shareholders	$ 191,025	$ (324,913)	$ 755,087	$ (719,326)
Amount allocated to participating common shareholders	(2,889)	(272)	(11,650)	(507)
Net income (loss) allocated to RenaissanceRe common shareholders	$ 188,136	$ (325,185)	$ 743,437	$ (719,833)
Denominator:
Denominator for basic income (loss) per RenaissanceRe common share - weighted average common shares (in shares)	45,898	43,170	44,387	43,264
Per common share equivalents of non-vested shares (in shares)	92	0	111	0
Denominator for diluted income (loss) per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions (in shares)	45,990	43,170	44,498	43,264
Net income (loss) available (attributable) to RenaissanceRe common shareholders per common share – basic (in dollars per share)	$ 4.10	$ (7.53)	$ 16.75	$ (16.64)
Net income (loss) available (attributable) to RenaissanceRe common shareholders per common share – diluted (in dollars per share)	$ 4.09	$ (7.53)	$ 16.71	$ (16.64)