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Condensed Consolidating Financial Information Provided in Connection with Outstanding Debt of Subsidiaries (Condensed Consolidating Statement of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Comprehensive income (loss)
Net income (loss)	$ 107,944	$ 48,829	$ 909,927	$ 392,903
Change in net unrealized gains on investments, net of tax	608	(382)	1,880	(1,707)
Foreign currency translation adjustments, net of tax	8,249		4,541
Comprehensive income	116,801	48,447	916,348	391,196
Net (income) loss attributable to redeemable noncontrolling interests	(62,057)	(6,440)	(204,091)	(90,822)
Comprehensive income attributable to redeemable noncontrolling interests	(62,057)	(6,440)	(204,091)	(90,822)
Comprehensive income attributable to RenaissanceRe	54,744	42,007	712,257	300,374
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer)
Comprehensive income (loss)
Net income (loss)	2,843	6,698	17,549	9,487
Change in net unrealized gains on investments, net of tax	0	0	0	0
Foreign currency translation adjustments, net of tax	0		0
Comprehensive income	2,843	6,698	17,549	9,487
Net (income) loss attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to RenaissanceRe	2,843	6,698	17,549	9,487
Reportable Legal Entities | RenaissanceRe Finance Inc. (Subsidiary Issuer)
Comprehensive income (loss)
Net income (loss)	869	(1,486)	32,900	(14,198)
Change in net unrealized gains on investments, net of tax	0	0	0	0
Foreign currency translation adjustments, net of tax	0		0
Comprehensive income	869	(1,486)	32,900	(14,198)
Net (income) loss attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to RenaissanceRe	869	(1,486)	32,900	(14,198)
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Comprehensive income (loss)
Net income (loss)	45,887	42,389	705,836	302,081
Change in net unrealized gains on investments, net of tax	0	0	0	0
Foreign currency translation adjustments, net of tax	0		0
Comprehensive income	45,887	42,389	705,836	302,081
Net (income) loss attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to RenaissanceRe	45,887	42,389	705,836	302,081
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries and Eliminations (Non-Guarantor Subsidiaries)
Comprehensive income (loss)
Net income (loss)	157,199	54,498	1,053,164	430,169
Change in net unrealized gains on investments, net of tax	608	(382)	1,880	(1,707)
Foreign currency translation adjustments, net of tax	8,249		4,541
Comprehensive income	166,056	54,116	1,059,585	428,462
Net (income) loss attributable to redeemable noncontrolling interests	(62,057)	(6,440)	(204,091)	(90,822)
Comprehensive income attributable to redeemable noncontrolling interests	(62,057)	(6,440)	(204,091)	(90,822)
Comprehensive income attributable to RenaissanceRe	103,999	47,676	855,494	337,640
Consolidating Adjustments
Comprehensive income (loss)
Net income (loss)	(98,854)	(53,270)	(899,522)	(334,636)
Change in net unrealized gains on investments, net of tax	0	0	0	0
Foreign currency translation adjustments, net of tax	0		0
Comprehensive income	(98,854)	(53,270)	(899,522)	(334,636)
Net (income) loss attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to RenaissanceRe	$ (98,854)	$ (53,270)	$ (899,522)	$ (334,636)

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