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Acquisition of Platinum Narrative (Details) (USD $) | 3 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 02, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 01, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |
Income tax benefit (expense) | $ 47,904,000 us-gaap_IncomeTaxExpenseBenefit | $ (166,000)us-gaap_IncomeTaxExpenseBenefit |  |  |  |  |
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 |  |  |  |
Platinum |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Percent acquired |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember |  |  |
Share price, in usd per share |  |  |  | $ 76 us-gaap_BusinessAcquisitionSharePrice / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember |  |  |
Aggregate consideration transferred |  |  |  | 1,932,405,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember |  |  |
Cash consideration paid by RenaissanceRe to common shareholders of Platinum and holders of Platinum equity awards |  |  |  | 1,160,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember |  |  |
Transaction-related costs | 40,400,000 rnr_BusinessAcquisitionAcquisitionandIntegrationRelatedCosts / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember |  |  |  |  | 6,700,000 rnr_BusinessAcquisitionAcquisitionandIntegrationRelatedCosts / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember |
Acquisition-related costs | 11,500,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember |  |  |  |  |  |
Integration-related costs | 900,000 us-gaap_BusinessCombinationIntegrationRelatedCosts / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember |  |  |  |  |  |
Compensation-related costs |  |  |  |  | 28,000,000 us-gaap_SeveranceCosts1 / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember |  |
Goodwill |  |  |  | 191,729,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember |  |  |
Finite lived intangible assets acquired |  |  |  | 75,200,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember |  |  |
Weighted average useful life |  |  |  | 8 years |  |  |
Indefinite lived intangible assets acquired |  |  |  | 8,400,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember |  |  |
Adjustment to other assets |  |  |  | (1,046,000)rnr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssetsAdjustment / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember |  |  |
Adjustment to deferred tax asset |  |  |  | 29,069,000 rnr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeferredTaxAssetsAdjustment / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember |  |  |
Total adjustments for fair value of the identifiable intangible assets |  |  |  | (13,115,000)rnr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeferredTaxLiabilitiesAdjustment / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember |  |  |
Reduction in deferred tax asset | 47,400,000 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember |  |  |  |  |  |
Platinum | Common Shares |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Share price, in usd per share |  |  |  | $ 35.96 us-gaap_BusinessAcquisitionSharePrice / 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 |  |  |  | 761,819,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / 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 |  |  |  | 904,433,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |
Platinum |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Dividends per common share, in usd per share |  |  |  |  |  |  | $ 10 us-gaap_CommonStockDividendsPerShareCashPaid / dei_LegalEntityAxis = rnr_PlatinumMember
Dividends paid, value |  |  |  | 253,203,000 us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = rnr_PlatinumMember |  |  | 253,203,000 us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = rnr_PlatinumMember
Available funds to fund acquisition |  |  |  | 604,400,000 rnr_BusinessAcquisitionAvailableFundstoFundAcquisition / dei_LegalEntityAxis = rnr_PlatinumMember |  |  |
Bridge Loan |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Short-term debt |  |  |  | $ 300,000,000 us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_BridgeLoanMember |  |  |

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