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Commitments, Contingencies and Other Items (Narrative) (Details) (USD $)	12 Months Ended
	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	$ 623,800,000rnr_PrivateEquityPartnershipsAndOtherEntitiesInitialCommitments
Fulfilled commitments	544,100,000rnr_PrivateEquityPartnershipsAndOtherEntitiesCommitmentsFulfilled
Unfunded commitments	84,000,000rnr_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	624,900,000us-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	37,500,000us-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	$ 50,000,000us-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.

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- Definition

Percentage of Aggregate Outstanding Letter of Credit Unsecured and Subject to Covenants

+ References

No definition available.

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- Definition

Private Equity Partnerships and Other Entities, Commitments Fulfilled

+ References

No definition available.

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Private Equity Partnerships and Other Entities, Initial Commitments

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Private Equity Partnerships and Other Entities, Unfunded Commitments

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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

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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- Definition

The estimated maximum amount of possible loss from the contingency.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

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The carrying amount, as of the date of the latest financial statement presented, of all assets that are pledged as collateral for the payment of the related debt obligation primarily arising from secured borrowings, repurchase agreements or other current or potential obligations, where the secured party does not have the right by contract or custom to sell or re-pledge the collateral and therefore are not reclassified and separately reported in the statement of financial position.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 50

-Paragraph 1A

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