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Commitments, Contingencies and Other Items (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014
Commitments and Contingencies [Line Items] |
Percentage of aggregate outstanding letters of credit secured | 75.00%rnr_PercentageOfAggregateOutstandingLetterOfCreditSecuredBySecurities
Percentage of aggregate outstanding letters of credit subject to certain financial covenants | 25.00%rnr_PercentageOfAggregateOutstandingLetterOfCreditUnsecuredAndSubjectToCovenants
Initial commitments | $ 623,800,000 rnr_PrivateEquityPartnershipsAndOtherEntitiesInitialCommitments
Fulfilled commitments | 544,100,000 rnr_PrivateEquityPartnershipsAndOtherEntitiesCommitmentsFulfilled
Unfunded commitments | 84,000,000 rnr_PrivateEquityPartnershipsAndOtherEntitiesUnfundedCommitments
Maximum | Investments as a Percentage of Shareholders' Equity |
Commitments and Contingencies [Line Items] |
Concentration risk percentage | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_InvestmentsAsPercentageOfEquityMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Letter of Credit |
Commitments and Contingencies [Line Items] |
Letters of credit outstanding | 624,900,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_LetterOfCreditMember
Top Layer Re | Letter of Credit |
Commitments and Contingencies [Line Items] |
Collateral pledged to support letter of credit | 37,500,000 us-gaap_PledgedAssetsNotSeparatelyReportedOnStatementOfFinancialPosition / dei_LegalEntityAxis = rnr_TopLayerReMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_LetterOfCreditMember
Capital Support Agreement | Top Layer Re | Letter of Credit |
Commitments and Contingencies [Line Items] |
Maximum mandatory capital contribution in the event of loss that reduced capital and surplus below specified level | $ 50,000,000 us-gaap_LossContingencyRangeOfPossibleLossMaximum / dei_LegalEntityAxis = rnr_TopLayerReMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_CapitalSupportAgreementMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_LetterOfCreditMember

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- Definition Percentage of Aggregate Outstanding Letter of Credit Secured by Securities + References No definition available. + Details
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- Definition Private Equity Partnerships and Other Entities, Commitments Fulfilled + References No definition available. + Details
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- Definition Private Equity Partnerships and Other Entities, Initial Commitments + References No definition available. + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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