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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
	Mar. 31, 2019	Mar. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Net income	$ 353,128	$ 92,207
Change in net unrealized losses on investments	(37)	(30)
Comprehensive income	353,091	92,177
Net (income) loss attributable to redeemable noncontrolling interests	(70,222)	(29,899)
Comprehensive (income) loss attributable to redeemable noncontrolling interests	(70,222)	(29,899)
Comprehensive income attributable to RenaissanceRe	282,869	62,278
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer)
Condensed Financial Statements, Captions [Line Items]
Net income	7,766	272
Change in net unrealized losses on investments	0	0
Comprehensive income	7,766	272
Net (income) loss attributable to redeemable noncontrolling interests	0	0
Comprehensive (income) loss attributable to redeemable noncontrolling interests	0	0
Comprehensive income attributable to RenaissanceRe	7,766	272
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer)
Condensed Financial Statements, Captions [Line Items]
Net income	16,743	(20,134)
Change in net unrealized losses on investments	0	0
Comprehensive income	16,743	(20,134)
Net (income) loss attributable to redeemable noncontrolling interests	0	0
Comprehensive (income) loss attributable to redeemable noncontrolling interests	0	0
Comprehensive income attributable to RenaissanceRe	16,743	(20,134)
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Condensed Financial Statements, Captions [Line Items]
Net income	282,906	62,308
Change in net unrealized losses on investments	0	0
Comprehensive income	282,906	62,308
Net (income) loss attributable to redeemable noncontrolling interests	0	0
Comprehensive (income) loss attributable to redeemable noncontrolling interests	0	0
Comprehensive income attributable to RenaissanceRe	282,906	62,308
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries and Eliminations (Non-Guarantor Subsidiaries)
Condensed Financial Statements, Captions [Line Items]
Net income	395,156	106,657
Change in net unrealized losses on investments	(37)	(30)
Comprehensive income	395,119	106,627
Net (income) loss attributable to redeemable noncontrolling interests	(70,222)	(29,899)
Comprehensive (income) loss attributable to redeemable noncontrolling interests	(70,222)	(29,899)
Comprehensive income attributable to RenaissanceRe	324,897	76,728
Consolidating Adjustments
Condensed Financial Statements, Captions [Line Items]
Net income	(349,443)	(56,896)
Change in net unrealized losses on investments	0	0
Comprehensive income	(349,443)	(56,896)
Net (income) loss attributable to redeemable noncontrolling interests	0	0
Comprehensive (income) loss attributable to redeemable noncontrolling interests	0	0
Comprehensive income attributable to RenaissanceRe	$ (349,443)	$ (56,896)

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