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Statutory Requirements (Narrative) (Details) (USD $) | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013
Statutory Accounting Practices [Line Items] |  |
Retained earnings available for payment of dividends or distribution to shareholders | 2,400,000,000 us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval | $ 2,600,000,000 us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval
Assets held in trust | 2,379,400,000 us-gaap_AssetsHeldInTrust | 2,081,100,000 us-gaap_AssetsHeldInTrust
Renaissance Reinsurance | Bermuda |  |
Statutory Accounting Practices [Line Items] |  |
Unrecorded liabilities, exempt by regulatory authority | 468,600,000 rnr_StatutoryAccountingPracticesUnrecordedLiabilitiesExemptbyRegulatoryAuthority / dei_LegalEntityAxis = rnr_RenaissanceReinsuranceMember / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_BM | 168,000,000 rnr_StatutoryAccountingPracticesUnrecordedLiabilitiesExemptbyRegulatoryAuthority / dei_LegalEntityAxis = rnr_RenaissanceReinsuranceMember / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = country_BM
Multi-Beneficiary Reinsurance Trust | Renaissance Reinsurance | New York |  |
Statutory Accounting Practices [Line Items] |  |
Assets held in trust | 508,600,000 us-gaap_AssetsHeldInTrust / dei_LegalEntityAxis = rnr_RenaissanceReinsuranceMember / rnr_ReinsuranceTrustFundAxis = rnr_MultiBeneficiaryReinsuranceTrustMember / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = stpr_NY | 505,100,000 us-gaap_AssetsHeldInTrust / dei_LegalEntityAxis = rnr_RenaissanceReinsuranceMember / rnr_ReinsuranceTrustFundAxis = rnr_MultiBeneficiaryReinsuranceTrustMember / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = stpr_NY
Multi-Beneficiary Reinsurance Trust | DaVinciRe | New York |  |
Statutory Accounting Practices [Line Items] |  |
Assets held in trust | 173,700,000 us-gaap_AssetsHeldInTrust / dei_LegalEntityAxis = rnr_DavincireMember / rnr_ReinsuranceTrustFundAxis = rnr_MultiBeneficiaryReinsuranceTrustMember / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = stpr_NY | 173,900,000 us-gaap_AssetsHeldInTrust / dei_LegalEntityAxis = rnr_DavincireMember / rnr_ReinsuranceTrustFundAxis = rnr_MultiBeneficiaryReinsuranceTrustMember / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = stpr_NY
Multi-Beneficiary Reduced Collateral Reinsurance Trust | New York |  |
Statutory Accounting Practices [Line Items] |  |
Multi-beneficiary reduced collateral reinsurance trust collateral reduction | 20.00%rnr_MultiBeneficiaryReducedCollateralReinsuranceTrustCollateralReduction / rnr_ReinsuranceTrustFundAxis = rnr_MultiBeneficiaryReducedCollateralReinsuranceTrustMember / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = stpr_NY |
Multi-Beneficiary Reduced Collateral Reinsurance Trust | Renaissance Reinsurance | New York |  |
Statutory Accounting Practices [Line Items] |  |
Assets held in trust | 43,200,000 us-gaap_AssetsHeldInTrust / dei_LegalEntityAxis = rnr_RenaissanceReinsuranceMember / rnr_ReinsuranceTrustFundAxis = rnr_MultiBeneficiaryReducedCollateralReinsuranceTrustMember / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = stpr_NY | 21,100,000 us-gaap_AssetsHeldInTrust / dei_LegalEntityAxis = rnr_RenaissanceReinsuranceMember / rnr_ReinsuranceTrustFundAxis = rnr_MultiBeneficiaryReducedCollateralReinsuranceTrustMember / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = stpr_NY
Multi-Beneficiary Reduced Collateral Reinsurance Trust | DaVinciRe | New York |  |
Statutory Accounting Practices [Line Items] |  |
Assets held in trust | 18,800,000 us-gaap_AssetsHeldInTrust / dei_LegalEntityAxis = rnr_DavincireMember / rnr_ReinsuranceTrustFundAxis = rnr_MultiBeneficiaryReducedCollateralReinsuranceTrustMember / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = stpr_NY | 18,600,000 us-gaap_AssetsHeldInTrust / dei_LegalEntityAxis = rnr_DavincireMember / rnr_ReinsuranceTrustFundAxis = rnr_MultiBeneficiaryReducedCollateralReinsuranceTrustMember / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = stpr_NY
Minimum | Multi-Beneficiary Reinsurance Trust | Renaissance Reinsurance | New York |  |
Statutory Accounting Practices [Line Items] |  |
Assets held in trust | 409,900,000 us-gaap_AssetsHeldInTrust / dei_LegalEntityAxis = rnr_RenaissanceReinsuranceMember / us-gaap_RangeAxis = us-gaap_MinimumMember / rnr_ReinsuranceTrustFundAxis = rnr_MultiBeneficiaryReinsuranceTrustMember / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = stpr_NY | 441,700,000 us-gaap_AssetsHeldInTrust / dei_LegalEntityAxis = rnr_RenaissanceReinsuranceMember / us-gaap_RangeAxis = us-gaap_MinimumMember / rnr_ReinsuranceTrustFundAxis = rnr_MultiBeneficiaryReinsuranceTrustMember / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = stpr_NY
Minimum | Multi-Beneficiary Reinsurance Trust | DaVinciRe | New York |  |
Statutory Accounting Practices [Line Items] |  |
Assets held in trust | 105,700,000 us-gaap_AssetsHeldInTrust / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_RangeAxis = us-gaap_MinimumMember / rnr_ReinsuranceTrustFundAxis = rnr_MultiBeneficiaryReinsuranceTrustMember / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = stpr_NY | 135,200,000 us-gaap_AssetsHeldInTrust / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_RangeAxis = us-gaap_MinimumMember / rnr_ReinsuranceTrustFundAxis = rnr_MultiBeneficiaryReinsuranceTrustMember / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = stpr_NY
Minimum | Multi-Beneficiary Reduced Collateral Reinsurance Trust | Renaissance Reinsurance | New York |  |
Statutory Accounting Practices [Line Items] |  |
Assets held in trust | 17,500,000 us-gaap_AssetsHeldInTrust / dei_LegalEntityAxis = rnr_RenaissanceReinsuranceMember / us-gaap_RangeAxis = us-gaap_MinimumMember / rnr_ReinsuranceTrustFundAxis = rnr_MultiBeneficiaryReducedCollateralReinsuranceTrustMember / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = stpr_NY | 16,300,000 us-gaap_AssetsHeldInTrust / dei_LegalEntityAxis = rnr_RenaissanceReinsuranceMember / us-gaap_RangeAxis = us-gaap_MinimumMember / rnr_ReinsuranceTrustFundAxis = rnr_MultiBeneficiaryReducedCollateralReinsuranceTrustMember / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = stpr_NY
Minimum | Multi-Beneficiary Reduced Collateral Reinsurance Trust | DaVinciRe | New York |  |
Statutory Accounting Practices [Line Items] |  |
Assets held in trust | 10,300,000 us-gaap_AssetsHeldInTrust / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_RangeAxis = us-gaap_MinimumMember / rnr_ReinsuranceTrustFundAxis = rnr_MultiBeneficiaryReducedCollateralReinsuranceTrustMember / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = stpr_NY | $ 10,200,000 us-gaap_AssetsHeldInTrust / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_RangeAxis = us-gaap_MinimumMember / rnr_ReinsuranceTrustFundAxis = rnr_MultiBeneficiaryReducedCollateralReinsuranceTrustMember / us-gaap_StatutoryAccountingPracticesByJurisdictionAxis = stpr_NY

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- Definition Reduction in collateral requirements of multi-beneficiary reinsurance trust to the percentage noted of the net outstanding insurance liabilities. + References No definition available. + Details
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- Definition Statutory Accounting Practices, Unrecorded Liabilities, Exempt by Regulatory Authority + References No definition available. + Details
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- Definition The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of dividends that can be declared or paid without approval of regulatory agency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph e -Article 4 + Details
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