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Debt and Credit Facilities (Narrative) (Details)
12 Months Ended 12 Months Ended 0 Months Ended 0 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2014
Letter of Credit
USD ($)
Dec. 31, 2013
RenRe North America Holdings Inc.
USD ($)
Dec. 31, 2012
RenRe North America Holdings Inc.
USD ($)
Dec. 31, 2014
Syndicate 1458
Citibank Europe PLC
Letter of Credit
USD ($)
Dec. 31, 2014
Syndicate 1458
Citibank Europe PLC
Letter of Credit
GBP (£)
Dec. 31, 2014
RenaissanceRe Specialty Risks
Citibank Europe PLC
Letter of Credit
USD ($)
Dec. 31, 2014
Top Layer Re
Letter of Credit
USD ($)
Dec. 31, 2014
Top Layer Re
Capital Support Agreement
Letter of Credit
USD ($)
Dec. 31, 2014
DaVinciRe
USD ($)
Apr. 01, 2011
DaVinciRe
USD ($)
Mar. 17, 2010
5.75% Senior Notes Due March 15, 2020
RenRe North America Holdings Inc.
USD ($)
Feb. 15, 2013
5.875% Senior Notes Due February 15, 2013
USD ($)
Jan. 31, 2003
5.875% Senior Notes Due February 15, 2013
Jan. 31, 2003
5.875% Senior Notes Due February 15, 2013
USD ($)
Dec. 31, 2014
Revolving Credit Facility
USD ($)
May 23, 2013
Revolving Credit Facility
USD ($)
May 17, 2012
Revolving Credit Facility
USD ($)
Dec. 31, 2014
Revolving Credit Facility
Renaissance Reinsurance
USD ($)
Dec. 31, 2014
Standby Letter of Credit Facility
USD ($)
Dec. 31, 2014
Bilateral Facility
Renaissance Reinsurance, DaVinci, RenaissanceRe Specialty Risks, ROE and RenaissanceRe Specialty U.S.
Letter of Credit
USD ($)
Oct. 01, 2013
Bilateral Facility
Renaissance Reinsurance, DaVinci, RenaissanceRe Specialty Risks, ROE and RenaissanceRe Specialty U.S.
Letter of Credit
USD ($)
Oct. 01, 2013
Bilateral Facility
RenaissanceRe Specialty Risks
Letter of Credit
USD ($)
Apr. 01, 2011
LIBOR
DaVinciRe
Debt Instrument [Line Items]                                                    
Debt Instrument, face amount                           $ 250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rnr_FivePointSevenFivePercentageSeniorNotesDueMarchFifteenTwoThousandAndTwentyMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
    $ 100,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= rnr_FivePointEightSevenFivePercentageSeniorNotesDueFebruaryFifteenTwoThousandAndThirteenMember
                 
Senior notes interest rate                           5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rnr_FivePointSevenFivePercentageSeniorNotesDueMarchFifteenTwoThousandAndTwentyMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rnr_FivePointEightSevenFivePercentageSeniorNotesDueFebruaryFifteenTwoThousandAndThirteenMember
  5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= rnr_FivePointEightSevenFivePercentageSeniorNotesDueFebruaryFifteenTwoThousandAndThirteenMember
                 
Debt instrument maturity date                           March 15, 2020 February 15, 2013 February 15, 2013                    
Net repayment of debt 0us-gaap_ProceedsFromRepaymentsOfDebt (102,436,000)us-gaap_ProceedsFromRepaymentsOfDebt (1,937,000)us-gaap_ProceedsFromRepaymentsOfDebt   0us-gaap_ProceedsFromRepaymentsOfDebt
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
0us-gaap_ProceedsFromRepaymentsOfDebt
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
                100,000,000us-gaap_ProceedsFromRepaymentsOfDebt
/ us-gaap_DebtInstrumentAxis
= rnr_FivePointEightSevenFivePercentageSeniorNotesDueFebruaryFifteenTwoThousandAndThirteenMember
                     
Letter of credit aggregate commitment                                     250,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
150,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
           
Line of credit faciltiy, maximum borrowing capacity                                     350,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
        300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= rnr_BilateralFacilityMember
/ dei_LegalEntityAxis
= rnr_RenaissanceReinsuranceDaVinciRenaissanceReSpecialtyRisksROEandRenaissanceReSpecialtyU.S.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LetterOfCreditMember
50,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= rnr_BilateralFacilityMember
/ dei_LegalEntityAxis
= rnr_RenaissanceReSpecialtyRisksMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LetterOfCreditMember
 
Debt to capital ratio                         0.40us-gaap_RatioOfIndebtednessToNetCapital1
/ dei_LegalEntityAxis
= rnr_DavincireMember
        0.35us-gaap_RatioOfIndebtednessToNetCapital1
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
               
Minimum net worth requirements                         500,000,000us-gaap_MinimumNetWorthRequiredForCompliance
/ dei_LegalEntityAxis
= rnr_DavincireMember
        2,300,000,000us-gaap_MinimumNetWorthRequiredForCompliance
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
    1,100,000,000us-gaap_MinimumNetWorthRequiredForCompliance
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
/ dei_LegalEntityAxis
= rnr_RenaissanceReinsuranceMember
         
Letters of credit outstanding       624,900,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LetterOfCreditMember
                                  83,600,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_StandbyLettersOfCreditMember
       
Line of Credit Facility, Amount Outstanding                 9,100,000us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
/ dei_LegalEntityAxis
= rnr_RenaissanceReSpecialtyRisksMember
/ us-gaap_LineOfCreditFacilityAxis
= rnr_CitibankEuropePlcMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LetterOfCreditMember
                          123,200,000us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
/ us-gaap_DebtInstrumentAxis
= rnr_BilateralFacilityMember
/ dei_LegalEntityAxis
= rnr_RenaissanceReinsuranceDaVinciRenaissanceReSpecialtyRisksROEandRenaissanceReSpecialtyU.S.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LetterOfCreditMember
     
Loan agreement, remaining borrowing capacity                       0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ dei_LegalEntityAxis
= rnr_DavincireMember
                    176,800,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= rnr_BilateralFacilityMember
/ dei_LegalEntityAxis
= rnr_RenaissanceReinsuranceDaVinciRenaissanceReSpecialtyRisksROEandRenaissanceReSpecialtyU.S.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LetterOfCreditMember
     
Margin facility amount outstanding             300,000,000us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= rnr_Syndicate1458Member
/ us-gaap_LineOfCreditFacilityAxis
= rnr_CitibankEuropePlcMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LetterOfCreditMember
70,000,000us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= rnr_Syndicate1458Member
/ us-gaap_LineOfCreditFacilityAxis
= rnr_CitibankEuropePlcMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LetterOfCreditMember
                                   
Collateralized letter of credit and reimbursement agreement                   37,500,000us-gaap_PledgedAssetsNotSeparatelyReportedOnStatementOfFinancialPosition
/ dei_LegalEntityAxis
= rnr_TopLayerReMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LetterOfCreditMember
                               
Mandatory capital contribution in the event of capital and surplus reduction below a specified level                     50,000,000us-gaap_LossContingencyRangeOfPossibleLossMaximum
/ dei_LegalEntityAxis
= rnr_TopLayerReMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_CapitalSupportAgreementMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LetterOfCreditMember
                             
Loan agreement with related party                       100,000,000us-gaap_LoansAndLeasesReceivableRelatedParties
/ dei_LegalEntityAxis
= rnr_DavincireMember
200,000,000us-gaap_LoansAndLeasesReceivableRelatedParties
/ dei_LegalEntityAxis
= rnr_DavincireMember
                         
Basis spread on variable rate                                                   3.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ dei_LegalEntityAxis
= rnr_DavincireMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
Interest Paid $ 17,200,000us-gaap_InterestPaid $ 20,100,000us-gaap_InterestPaid $ 23,100,000us-gaap_InterestPaid