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Schedule II. Condensed Financial Information Of Registrant (Statements of Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ (40,155)	$ 762,405	$ 748,798
Change in net unrealized gains (losses) on investments, net of tax	(2,492)	606	2,173
Foreign currency translation adjustments, net of tax	4,225	(11,309)	(2,679)
Comprehensive income (loss) attributable to RenaissanceRe	(38,422)	751,702	748,292
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(40,155)	762,405	748,798
Change in net unrealized gains (losses) on investments, net of tax	(2,492)	606	2,173
Foreign currency translation adjustments, net of tax	4,225	(11,309)	(2,679)
Comprehensive income (loss) attributable to RenaissanceRe	$ (38,422)	$ 751,702	$ 748,292

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