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Acquisition of Platinum Purchase Price (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended		3 Months Ended
	Mar. 31, 2015	Mar. 02, 2015	Mar. 01, 2015
Common Shares
Business Acquisition [Line Items]
Dividends per common share, in usd per share	$ 0.3us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Share price		$ 102us-gaap_SharePrice / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Platinum
Business Acquisition [Line Items]
Agreed cash price paid to common shareholders of Platinum and Platinum Awards, in usd per share		$ 76us-gaap_BusinessAcquisitionSharePrice / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember
Cash consideration paid by RenaissanceRe to common shareholders of Platinum and holders of Platinum equity awards		$ 1,160,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember
Aggregate consideration transferred		1,932,405us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember
Total net purchase price paid by RenaissanceRe		1,679,202rnr_BusinessCombinationConsiderationTransferredNetofSpecialDividend / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember
Platinum | Common Shares
Business Acquisition [Line Items]
Business Combination, Common Shares and Equity Awards Canceled, Number of Shares		25,320,312rnr_BusinessCombinationCommonSharesandEquityAwardsCanceledShares / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Shares issued		7,434,561us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Shares issued, value		761,819us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Fair value of Platinum common shares owned by RenaissanceRe and canceled in connection with the acquisition of Platinum		12,950rnr_BusinessCombinationEquityInterestinAcquireeFairValue / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Platinum common shares owned by RenaissanceRe and canceled in connection with the acquisition of Platinum		(169,220)rnr_BusinessCombinationEquityInterestinAcquireeShares / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Number of Platinum common shares and Platinum equity awards canceled in the acquisition of Platinum excluding those owned by RenaissanceRe and canceled in connection with the acquisition of Platinum		25,151,092rnr_BusinessCombinationCommonSharesandEquityAwardsCanceledNetofEquityInterestinAcquireeHeldPriortoCombinationShares / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Agreed cash price paid to common shareholders of Platinum and Platinum Awards, in usd per share		$ 35.96us-gaap_BusinessAcquisitionSharePrice / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Cash consideration paid by RenaissanceRe to common shareholders of Platinum and holders of Platinum equity awards		904,433us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Platinum
Business Acquisition [Line Items]
Business Combination, Common Shares and Equity Awards Canceled, Number of Shares			25,320,312rnr_BusinessCombinationCommonSharesandEquityAwardsCanceledShares / dei_LegalEntityAxis = rnr_PlatinumMember
Dividends per common share, in usd per share			$ 10us-gaap_CommonStockDividendsPerShareCashPaid / dei_LegalEntityAxis = rnr_PlatinumMember
Dividends paid, value		$ 253,203us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = rnr_PlatinumMember	$ 253,203us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = rnr_PlatinumMember

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