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Acquisition of Platinum Fair Value of Net Assets Acquired and Liabilities Assumed (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended
	Mar. 02, 2015	Mar. 01, 2015	Mar. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Shareholders’ equity of Platinum prior to Special Dividend			$ 4,782,289us-gaap_StockholdersEquity	$ 3,865,715us-gaap_StockholdersEquity
Platinum
Adjustments for Fair Value, By Applicable Balance Sheet Caption [Abstract]
Deferred acquisition costs	(44,486)rnr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeferredAcquisitionCostsAdjustment / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember
Debt	(28,899)rnr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedNoncurrentLiabilitiesLongtermDebtAdjustment / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember
Reserve for claims and claim expenses	(21,725)rnr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedReserveforClaimsandClaimExpensesAdjustment / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember
Other assets - deferred debt issuance costs	(1,046)rnr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssetsAdjustment / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember
Total adjustments for fair value by applicable balance sheet caption before tax impact	(96,156)rnr_BusinessCombinationIdentifiableAssetsAcquiredandLiabilitiesAssumedExcludingIntangibleAssetsAdjustmentbeforeDeferredTax / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember
Other assets - net deferred tax asset related to fair value adjustments	29,069rnr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeferredTaxAssetsAdjustment / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember
Total adjustments for fair value by applicable balance sheet caption	(67,087)rnr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedExcludingIntangibleAssetsAdjustmentNetofDeferredTax / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember
Adjustments for Fair Value of the Identifiable Intangible Assets [Abstract]
Identifiable indefinite lived intangible assets (insurance licenses)	8,400rnr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedIndefiniteLivedIntangibleAssetsAdjustment / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember
Identifiable finite lived intangible assets (non-contractual relationships, renewal rights, value of business acquired, trade name, internally developed and used computer software and covenants not to compete)	75,200rnr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedFiniteLivedIntangiblesAdjustment / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember
Identifiable intangible assets before tax impact		83,600rnr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedIntangibleAssetsOtherthanGoodwillAdjustmentBeforeDeferredTax / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember
Total adjustments for fair value of the identifiable intangible assets	(13,115)rnr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeferredTaxLiabilitiesAdjustment / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember
Total adjustments for fair value of the identifiable intangible assets	70,485rnr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedIntangibleAssetsOtherthanGoodwillAdjustmentNetofDeferredTax / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember
Total adjustments for fair value by applicable balance sheet caption and identifiable intangible assets	3,398rnr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedNetAdjustment / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember
Shareholders’ equity of Platinum at fair value	1,487,473us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember
Total net purchase price paid by RenaissanceRe	1,679,202rnr_BusinessCombinationConsiderationTransferredNetofSpecialDividend / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember
Excess purchase price over the fair value of net assets acquired assigned to goodwill	191,729us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember
Platinum
Business Acquisition [Line Items]
Shareholders’ equity of Platinum prior to Special Dividend		1,737,278us-gaap_StockholdersEquity / dei_LegalEntityAxis = rnr_PlatinumMember
Cash and cash equivalents (Special Dividend on Platinum common shares and Platinum equity awards)	(253,203)us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = rnr_PlatinumMember	(253,203)us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = rnr_PlatinumMember
Adjusted shareholders’ equity of Platinum at March 2, 2015	$ 1,484,075rnr_ShareholdersEquityAdjusted / dei_LegalEntityAxis = rnr_PlatinumMember

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