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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Comprehensive income
Net income	$ 191,634	$ 74,389	$ 701,862	$ 25,173	$ 40,340	$ 107,944	$ 448,855	$ 353,128	$ 993,058	$ 950,267	$ 268,917
Change in net unrealized gains on investments, net of tax									606	2,173	(1,657)
Foreign currency translation adjustments, net of tax									(11,309)	(2,679)	0
Comprehensive income									982,355	949,761	267,260
Net income attributable to redeemable noncontrolling interests									(230,653)	(201,469)	(41,553)
Comprehensive income attributable to redeemable noncontrolling interests									(230,653)	(201,469)	(41,553)
Comprehensive income attributable to RenaissanceRe									$ 751,702	$ 748,292	$ 225,707

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