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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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Condensed Financial Statements, Captions [Line Items]
Net income	$ 214,350	$ 172,556	$ 346,624	$ 350,737
Change in net unrealized gains on investments	219	672	(1,272)	229
Comprehensive income	214,569	173,228	345,352	350,966
Net income attributable to redeemable noncontrolling interests	(37,612)	(30,635)	(71,939)	(75,226)
Comprehensive income attributable to noncontrolling interests	(37,612)	(30,635)	(71,939)	(75,226)
Comprehensive income attributable to RenaissanceRe	176,957	142,593	273,413	275,740
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer)
Condensed Financial Statements, Captions [Line Items]
Net income	2,507	2,097	5,818	3,168
Change in net unrealized gains on investments	0	0	0	0
Comprehensive income	2,507	2,097	5,818	3,168
Net income attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to noncontrolling interests	0	0	0	0
Comprehensive income attributable to RenaissanceRe	2,507	2,097	5,818	3,168
Reportable Legal Entities | Platinum Underwriters Finance, Inc. (Subsidiary Issuer)
Condensed Financial Statements, Captions [Line Items]
Net income	17,995	13,967	30,570	37,827
Change in net unrealized gains on investments	0	0	0	0
Comprehensive income	17,995	13,967	30,570	37,827
Net income attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to noncontrolling interests	0	0	0	0
Comprehensive income attributable to RenaissanceRe	17,995	13,967	30,570	37,827
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer)
Condensed Financial Statements, Captions [Line Items]
Net income	10,391	8,974	14,931	22,920
Change in net unrealized gains on investments	0	0	0	0
Comprehensive income	10,391	8,974	14,931	22,920
Net income attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to noncontrolling interests	0	0	0	0
Comprehensive income attributable to RenaissanceRe	10,391	8,974	14,931	22,920
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Condensed Financial Statements, Captions [Line Items]
Net income	176,738	141,921	274,685	275,511
Change in net unrealized gains on investments	0	0	0	0
Comprehensive income	176,738	141,921	274,685	275,511
Net income attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to noncontrolling interests	0	0	0	0
Comprehensive income attributable to RenaissanceRe	176,738	141,921	274,685	275,511
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)
Condensed Financial Statements, Captions [Line Items]
Net income	226,895	181,077	369,561	357,673
Change in net unrealized gains on investments	219	672	(1,272)	229
Comprehensive income	227,114	181,749	368,289	357,902
Net income attributable to redeemable noncontrolling interests	(37,612)	(30,635)	(71,939)	(75,226)
Comprehensive income attributable to noncontrolling interests	(37,612)	(30,635)	(71,939)	(75,226)
Comprehensive income attributable to RenaissanceRe	189,502	151,114	296,350	282,676
Consolidating Adjustments
Condensed Financial Statements, Captions [Line Items]
Net income	(220,176)	(175,480)	(348,941)	(346,362)
Change in net unrealized gains on investments	0	0	0	0
Comprehensive income	(220,176)	(175,480)	(348,941)	(346,362)
Net income attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to noncontrolling interests	0	0	0	0
Comprehensive income attributable to RenaissanceRe	$ (220,176)	$ (175,480)	$ (348,941)	$ (346,362)

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