EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator:
Net income (loss) available (attributable) to RenaissanceRe common shareholders, basic	$ 193,988	$ (825,344)	$ 949,075	$ (1,544,670)
Amount allocated to participating common shareholders	(2,637)	(306)	(14,108)	(813)
Net income (loss) allocated to RenaissanceRe common shareholders	$ 191,351	$ (825,650)	$ 934,967	$ (1,545,483)
Denominator:
Denominator for basic income (loss) per RenaissanceRe common share - weighted average common shares (in shares)	50,261	42,837	46,345	43,121
Per common share equivalents of non-vested shares (in shares)	97	0	106	0
Denominator for diluted income (loss) per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions (in shares)	50,358	42,837	46,451	43,121
Net income (loss) available (attributable) to RenaissanceRe common shareholders per common share – basic (in dollars per share)	$ 3.81	$ (19.27)	$ 20.17	$ (35.84)
Net income (loss) available (attributable) to RenaissanceRe common shareholders per common share – diluted (in dollars per share)	$ 3.80	$ (19.27)	$ 20.13	$ (35.84)