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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 | $ 0.3 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |
Share price |  | $ 102 us-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 |  | $ 76 us-gaap_BusinessAcquisitionSharePrice / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember |
Cash consideration paid by RenaissanceRe to common shareholders of Platinum and holders of Platinum equity awards |  | $ 1,160,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember |
Aggregate consideration transferred |  | 1,932,405 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember |
Total net purchase price paid by RenaissanceRe |  | 1,679,202 rnr_BusinessCombinationConsiderationTransferredNetofSpecialDividend / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember |
Platinum | Common Shares |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Common Shares and Equity Awards Canceled, Number of Shares |  | 25,320,312 rnr_BusinessCombinationCommonSharesandEquityAwardsCanceledShares / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Shares issued |  | 7,434,561 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Shares issued, value |  | 761,819 us-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 |  | 12,950 rnr_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 |  | 25,151,092 rnr_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 |  | $ 35.96 us-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 |  | 904,433 us-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 |  |  | 25,320,312 rnr_BusinessCombinationCommonSharesandEquityAwardsCanceledShares / dei_LegalEntityAxis = rnr_PlatinumMember
Dividends per common share, in usd per share |  |  | $ 10 us-gaap_CommonStockDividendsPerShareCashPaid / dei_LegalEntityAxis = rnr_PlatinumMember
Dividends paid, value |  | $ 253,203 us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = rnr_PlatinumMember | $ 253,203 us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = rnr_PlatinumMember

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