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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Condensed Financial Statements, Captions [Line Items]
Net income	$ 448,855	$ 251,867	$ 801,983	$ 344,074
Change in net unrealized gains on investments, net of tax	1,309	(1,295)	1,272	(1,325)
Accumulated other comprehensive loss	(3,708)		(3,708)
Comprehensive income	446,456	250,572	799,547	342,749
Net (income) loss attributable to redeemable noncontrolling interests	(71,812)	(54,483)	(142,034)	(84,382)
Comprehensive (income) loss attributable to redeemable noncontrolling interests	(71,812)	(54,483)	(142,034)	(84,382)
Comprehensive income attributable to RenaissanceRe	374,644	196,089	657,513	258,367
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer)
Condensed Financial Statements, Captions [Line Items]
Net income	6,940	2,517	14,706	2,789
Change in net unrealized gains on investments, net of tax	0	0	0	0
Accumulated other comprehensive loss	0		0
Comprehensive income	6,940	2,517	14,706	2,789
Net (income) loss attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive (income) loss attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to RenaissanceRe	6,940	2,517	14,706	2,789
Reportable Legal Entities | RenaissanceRe Finance Inc. (Subsidiary Issuer)
Condensed Financial Statements, Captions [Line Items]
Net income	15,288	7,422	32,031	(12,712)
Change in net unrealized gains on investments, net of tax	0	0	0	0
Accumulated other comprehensive loss	0		0
Comprehensive income	15,288	7,422	32,031	(12,712)
Net (income) loss attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive (income) loss attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to RenaissanceRe	15,288	7,422	32,031	(12,712)
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Condensed Financial Statements, Captions [Line Items]
Net income	377,043	197,384	659,949	259,692
Change in net unrealized gains on investments, net of tax	0	0	0	0
Accumulated other comprehensive loss	0		0
Comprehensive income	377,043	197,384	659,949	259,692
Net (income) loss attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive (income) loss attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to RenaissanceRe	377,043	197,384	659,949	259,692
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries and Eliminations (Non-Guarantor Subsidiaries)
Condensed Financial Statements, Captions [Line Items]
Net income	500,809	269,014	895,965	375,671
Change in net unrealized gains on investments, net of tax	1,309	(1,295)	1,272	(1,325)
Accumulated other comprehensive loss	(3,708)		(3,708)
Comprehensive income	498,410	267,719	893,529	374,346
Net (income) loss attributable to redeemable noncontrolling interests	(71,812)	(54,483)	(142,034)	(84,382)
Comprehensive (income) loss attributable to redeemable noncontrolling interests	(71,812)	(54,483)	(142,034)	(84,382)
Comprehensive income attributable to RenaissanceRe	426,598	213,236	751,495	289,964
Consolidating Adjustments
Condensed Financial Statements, Captions [Line Items]
Net income	(451,225)	(224,470)	(800,668)	(281,366)
Change in net unrealized gains on investments, net of tax	0	0	0	0
Accumulated other comprehensive loss	0		0
Comprehensive income	(451,225)	(224,470)	(800,668)	(281,366)
Net (income) loss attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive (income) loss attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to RenaissanceRe	$ (451,225)	$ (224,470)	$ (800,668)	$ (281,366)

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