Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Revenues
Net premiums earned	$ 296,760us-gaap_PremiumsEarnedNet	$ 286,534us-gaap_PremiumsEarnedNet
Net investment income	39,707us-gaap_NetInvestmentIncome	38,948us-gaap_NetInvestmentIncome
Net foreign exchange losses	(3,130)	(1,061)
Equity in earnings of other ventures	5,295	4,199
Other income	1,539us-gaap_OtherOperatingIncomeExpenseNet	62us-gaap_OtherOperatingIncomeExpenseNet
Net realized and unrealized gains on investments	41,749us-gaap_GainLossOnInvestments	14,927us-gaap_GainLossOnInvestments
Total revenues	381,920us-gaap_Revenues	343,609us-gaap_Revenues
Expenses
Net claims and claim expenses incurred	76,853	58,915
Acquisition expenses	43,401	33,700
Operational expenses	45,621us-gaap_OperatingExpenses	42,624us-gaap_OperatingExpenses
Corporate expenses	45,598us-gaap_GeneralAndAdministrativeExpense	4,545us-gaap_GeneralAndAdministrativeExpense
Interest expense	5,251us-gaap_InterestExpense	4,293us-gaap_InterestExpense
Total expenses	216,724us-gaap_BenefitsLossesAndExpenses	144,077us-gaap_BenefitsLossesAndExpenses
(Loss) income before equity in net income (loss) of subsidiaries and taxes	165,196	199,532
Equity in net income (loss) of subsidiaries	0	0
Income before taxes	165,196	199,532
Income tax benefit (expense)	47,904us-gaap_IncomeTaxExpenseBenefit	(166)us-gaap_IncomeTaxExpenseBenefit
Net income	213,100us-gaap_ProfitLoss	199,366us-gaap_ProfitLoss
Net income attributable to noncontrolling interests	(39,662)	(42,768)
Net income attributable to RenaissanceRe	173,438us-gaap_NetIncomeLoss	156,598us-gaap_NetIncomeLoss
Dividends on preference shares	(5,595)us-gaap_DividendsPreferredStock	(5,595)us-gaap_DividendsPreferredStock
Net income available to RenaissanceRe common shareholders	167,843	151,003
RenaissanceRe Holdings Ltd. (Parent Guarantor)
Revenues
Net premiums earned	0	0
Net investment income	2,624	625
Net foreign exchange losses	(10)	1
Equity in earnings of other ventures	0	0
Other income	6,189	0
Net realized and unrealized gains on investments	39	(106)
Total revenues	8,842	520
Expenses
Net claims and claim expenses incurred	0	0
Acquisition expenses	0	0
Operational expenses	(1,178)	(880)
Corporate expenses	16,304	4,002
Interest expense	295	0
Total expenses	15,421	3,122
(Loss) income before equity in net income (loss) of subsidiaries and taxes	(6,579)	(2,602)
Equity in net income (loss) of subsidiaries	183,680	159,200
Income before taxes	177,101	156,598
Income tax benefit (expense)	(3,663)	0
Net income	173,438	156,598
Net income attributable to noncontrolling interests	0	0
Net income attributable to RenaissanceRe	173,438	156,598
Dividends on preference shares	(5,595)	(5,595)
Net income available to RenaissanceRe common shareholders	167,843	151,003
Platinum Underwriters Holdings, Ltd.
Revenues
Net premiums earned	0
Net investment income	0
Net foreign exchange losses	0
Equity in earnings of other ventures	0
Other income	166
Net realized and unrealized gains on investments	0
Total revenues	166
Expenses
Net claims and claim expenses incurred	0
Acquisition expenses	0
Operational expenses	4,987
Corporate expenses	8,182
Interest expense	0
Total expenses	13,169
(Loss) income before equity in net income (loss) of subsidiaries and taxes	(13,003)
Equity in net income (loss) of subsidiaries	(6,557)
Income before taxes	(19,560)
Income tax benefit (expense)	0
Net income	(19,560)
Net income attributable to noncontrolling interests	0
Net income attributable to RenaissanceRe	(19,560)
Dividends on preference shares	0
Net income available to RenaissanceRe common shareholders	(19,560)
RenRe North America Holdings Inc.
Revenues
Net premiums earned	0	0
Net investment income	331	474
Net foreign exchange losses	0	0
Equity in earnings of other ventures	0	0
Other income	0	(8)
Net realized and unrealized gains on investments	406	377
Total revenues	737	843
Expenses
Net claims and claim expenses incurred	0	0
Acquisition expenses	0	0
Operational expenses	1,890	1,894
Corporate expenses	98	59
Interest expense	3,617	3,617
Total expenses	5,605	5,570
(Loss) income before equity in net income (loss) of subsidiaries and taxes	(4,868)	(4,727)
Equity in net income (loss) of subsidiaries	17,399	853
Income before taxes	12,531	(3,874)
Income tax benefit (expense)	31,005	684
Net income	43,536	(3,190)
Net income attributable to noncontrolling interests	0	0
Net income attributable to RenaissanceRe	43,536	(3,190)
Dividends on preference shares	0	0
Net income available to RenaissanceRe common shareholders	43,536	(3,190)
Platinum Underwriters Finance, Inc.
Revenues
Net premiums earned	0
Net investment income	(40)
Net foreign exchange losses	0
Equity in earnings of other ventures	0
Other income	0
Net realized and unrealized gains on investments	1
Total revenues	(39)
Expenses
Net claims and claim expenses incurred	0
Acquisition expenses	0
Operational expenses	1
Corporate expenses	35
Interest expense	1,563
Total expenses	1,599
(Loss) income before equity in net income (loss) of subsidiaries and taxes	(1,638)
Equity in net income (loss) of subsidiaries	(2,146)
Income before taxes	(3,784)
Income tax benefit (expense)	571
Net income	(3,213)
Net income attributable to noncontrolling interests	0
Net income attributable to RenaissanceRe	(3,213)
Dividends on preference shares	0
Net income available to RenaissanceRe common shareholders	(3,213)
RenaissanceRe Finance, Inc.
Revenues
Net premiums earned	0
Net investment income	36
Net foreign exchange losses	0
Equity in earnings of other ventures	0
Other income	0
Net realized and unrealized gains on investments	0
Total revenues	36
Expenses
Net claims and claim expenses incurred	0
Acquisition expenses	0
Operational expenses	0
Corporate expenses	7
Interest expense	216
Total expenses	223
(Loss) income before equity in net income (loss) of subsidiaries and taxes	(187)
Equity in net income (loss) of subsidiaries	(3,213)
Income before taxes	(3,400)
Income tax benefit (expense)	65
Net income	(3,335)
Net income attributable to noncontrolling interests	0
Net income attributable to RenaissanceRe	(3,335)
Dividends on preference shares	0
Net income available to RenaissanceRe common shareholders	(3,335)
Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)
Revenues
Net premiums earned	296,760	286,534
Net investment income	37,730	38,786
Net foreign exchange losses	(3,120)	(1,062)
Equity in earnings of other ventures	5,295	4,199
Other income	1,208	70
Net realized and unrealized gains on investments	41,303	14,656
Total revenues	379,176	343,183
Expenses
Net claims and claim expenses incurred	77,412	58,915
Acquisition expenses	48,318	33,700
Operational expenses	34,515	41,688
Corporate expenses	21,007	484
Interest expense	594	676
Total expenses	181,846	135,463
(Loss) income before equity in net income (loss) of subsidiaries and taxes	197,330	207,720
Equity in net income (loss) of subsidiaries	11,916	0
Income before taxes	209,246	207,720
Income tax benefit (expense)	19,926	(850)
Net income	229,172	206,870
Net income attributable to noncontrolling interests	(39,662)	(42,768)
Net income attributable to RenaissanceRe	189,510	164,102
Dividends on preference shares	0	0
Net income available to RenaissanceRe common shareholders	189,510	164,102
Consolidating Adjustments
Revenues
Net premiums earned	0	0
Net investment income	(974)	(937)
Net foreign exchange losses	0	0
Equity in earnings of other ventures	0	0
Other income	(6,024)	0
Net realized and unrealized gains on investments	0	0
Total revenues	(6,998)	(937)
Expenses
Net claims and claim expenses incurred	(559)	0
Acquisition expenses	(4,917)	0
Operational expenses	5,406	(78)
Corporate expenses	(35)	0
Interest expense	(1,034)	0
Total expenses	(1,139)	(78)
(Loss) income before equity in net income (loss) of subsidiaries and taxes	(5,859)	(859)
Equity in net income (loss) of subsidiaries	(201,079)	(160,053)
Income before taxes	(206,938)	(160,912)
Income tax benefit (expense)	0	0
Net income	(206,938)	(160,912)
Net income attributable to noncontrolling interests	0	0
Net income attributable to RenaissanceRe	(206,938)	(160,912)
Dividends on preference shares	0	0
Net income available to RenaissanceRe common shareholders	$ (206,938)	$ (160,912)

The total amount of expense recognized during the period for future policy benefits, claims and claims adjustment costs, and for selling, general and administrative costs.

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Amount of expense related to deferred policy acquisition costs.

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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

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