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Discontinued Operations (Income (Loss) from Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues
Net investment income											$ 2,517rnr_DisposalGroupIncludingDiscontinuedOperationNetInvestmentIncome
Net foreign exchange gains (losses)											(96)rnr_DisposalGroupIncludingDiscontinuedOperationForeignCurrencyTransactionGainLossBeforeTax
Other (loss) income											(18,055)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome
Net realized and unrealized gains (losses) on fixed maturity investments											3rnr_DisposalGroupIncludingDiscontinuedOperationGainLossOnInvestments
Total revenues											(15,631)us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Expenses [Abstract]
Operational expenses											586rnr_DisposalGroupIncludingDiscontinuedOperationOtherCostAndExpenseOperating
Corporate expenses											236us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense
Total expenses											822rnr_DisposalGroupIncludingDiscontinuedOperationBenefitsLossesAndExpenses
(Loss) income before taxes											(16,453)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
Income tax expense											(23)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
(Loss) income from discontinued operations	0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	(9,779)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	2,427us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	9,774us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	2,422us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	(16,476)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
REAL
Revenues
Net investment income										1,150rnr_DisposalGroupIncludingDiscontinuedOperationNetInvestmentIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember	2,517rnr_DisposalGroupIncludingDiscontinuedOperationNetInvestmentIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember
Net foreign exchange gains (losses)										849rnr_DisposalGroupIncludingDiscontinuedOperationForeignCurrencyTransactionGainLossBeforeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember	(96)rnr_DisposalGroupIncludingDiscontinuedOperationForeignCurrencyTransactionGainLossBeforeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember
Other (loss) income										701us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember	(20,785)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember
Net realized and unrealized gains (losses) on fixed maturity investments										(18)rnr_DisposalGroupIncludingDiscontinuedOperationGainLossOnInvestments / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember	3rnr_DisposalGroupIncludingDiscontinuedOperationGainLossOnInvestments / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember
Total revenues										2,682us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember	(18,361)us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember
Expenses [Abstract]
Operational expenses										89rnr_DisposalGroupIncludingDiscontinuedOperationOtherCostAndExpenseOperating / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember	150rnr_DisposalGroupIncludingDiscontinuedOperationOtherCostAndExpenseOperating / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember
Corporate expenses										104us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember	236us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember
Total expenses										193rnr_DisposalGroupIncludingDiscontinuedOperationBenefitsLossesAndExpenses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember	386rnr_DisposalGroupIncludingDiscontinuedOperationBenefitsLossesAndExpenses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember
(Loss) income before taxes										2,489us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember	(18,747)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember
Income tax expense										(67)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember	(16)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember
(Loss) income from discontinued operations										2,422us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember	(18,763)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_REALMember
U.S.-based insurance operations
Revenues
Net investment income											0rnr_DisposalGroupIncludingDiscontinuedOperationNetInvestmentIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_FormerU.S.basedInsuranceoperationsMember
Net foreign exchange gains (losses)											0rnr_DisposalGroupIncludingDiscontinuedOperationForeignCurrencyTransactionGainLossBeforeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_FormerU.S.basedInsuranceoperationsMember
Other (loss) income											2,730us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_FormerU.S.basedInsuranceoperationsMember
Net realized and unrealized gains (losses) on fixed maturity investments											0rnr_DisposalGroupIncludingDiscontinuedOperationGainLossOnInvestments / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_FormerU.S.basedInsuranceoperationsMember
Total revenues											2,730us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_FormerU.S.basedInsuranceoperationsMember
Expenses [Abstract]
Operational expenses											436rnr_DisposalGroupIncludingDiscontinuedOperationOtherCostAndExpenseOperating / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_FormerU.S.basedInsuranceoperationsMember
Corporate expenses											0us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_FormerU.S.basedInsuranceoperationsMember
Total expenses											436rnr_DisposalGroupIncludingDiscontinuedOperationBenefitsLossesAndExpenses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_FormerU.S.basedInsuranceoperationsMember
(Loss) income before taxes											2,294us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_FormerU.S.basedInsuranceoperationsMember
Income tax expense											(7)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_FormerU.S.basedInsuranceoperationsMember
(Loss) income from discontinued operations											$ 2,287us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = rnr_FormerU.S.basedInsuranceoperationsMember

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Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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