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Organization (Details) (RenaissanceRe Upsilon Fund Ltd, Variable Interest Entity, Not Primary Beneficiary) | 0 Months Ended
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Nov. 13, 2014
RenaissanceRe Upsilon Fund Ltd | Variable Interest Entity, Not Primary Beneficiary |
Variable Interest Entity [Line Items] |
Percent of segregated funds owned by third party investors | 100.00%rnr_VariableInterestEntityNonredeemableNonvotingSharesSegregatedFundsOwnedbyThirdParties / dei_LegalEntityAxis = rnr_RenaissanceReUpsilonFundLtdMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember

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- Definition Variable Interest Entity, Nonredeemable Nonvoting Shares, Segregated Funds, Owned by Third Parties + References No definition available. + Details
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Namespace Prefix: | rnr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration