Earnings Per Share - Computation of Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Numerator:
Net income (loss) available (attributable) to RenaissanceRe common shareholders	$ (1,096,578)	$ (73,421)	$ 731,482
Amount allocated to participating common shareholders	(1,079)	(727)	(8,968)
Net income (loss) allocated to RenaissanceRe common shareholders	$ (1,097,657)	$ (74,148)	$ 722,514
Denominator:
Denominator for basic income (loss) per RenaissanceRe common share - weighted average common shares (in shares)	43,040	47,171	47,103
Per common share equivalents of non-vested shares (in shares)	0	0	75
Denominator for diluted income (loss) per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions (in shares)	43,040	47,171	47,178
Net (loss) income available (attributable) to RenaissanceRe common shareholders per common share – basic (in usd per share)	$ (25.50)	$ (1.57)	$ 15.34
Net (loss) income available (attributable) to RenaissanceRe common shareholders per common share – diluted (in usd per share)	$ (25.50)	$ (1.57)	$ 15.31
Potentially dilutive securities (in shares)	90