XML 59 R68.htm IDEA: XBRL DOCUMENT v2.4.1.9

Segment Reporting (Schedule Of Significant Components Of The Company's Revenues And Expenses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Gross premiums written	$ 643,578us-gaap_PremiumsWrittenGross	$ 705,260us-gaap_PremiumsWrittenGross
Net premiums written	404,035us-gaap_PremiumsWrittenNet	450,347us-gaap_PremiumsWrittenNet
Net premiums earned	296,760us-gaap_PremiumsEarnedNet	286,534us-gaap_PremiumsEarnedNet
Net claims and claim expenses incurred	76,853us-gaap_PolicyholderBenefitsAndClaimsIncurredNet	58,915us-gaap_PolicyholderBenefitsAndClaimsIncurredNet
Acquisition expenses	43,401us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense	33,700us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense
Operational expenses	45,621us-gaap_OperatingExpenses	42,624us-gaap_OperatingExpenses
Underwriting income (loss)	130,885rnr_UnderwritingIncomeLossNet	151,295rnr_UnderwritingIncomeLossNet
Net investment income	39,707us-gaap_NetInvestmentIncome	38,948us-gaap_NetInvestmentIncome
Net foreign exchange losses	(3,130)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax	(1,061)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Equity in earnings of other ventures	5,295us-gaap_IncomeLossFromEquityMethodInvestments	4,199us-gaap_IncomeLossFromEquityMethodInvestments
Other income	1,539us-gaap_OtherOperatingIncomeExpenseNet	62us-gaap_OtherOperatingIncomeExpenseNet
Net realized and unrealized gains on investments	41,749us-gaap_GainLossOnInvestments	14,927us-gaap_GainLossOnInvestments
Corporate expenses	(45,598)us-gaap_GeneralAndAdministrativeExpense	(4,545)us-gaap_GeneralAndAdministrativeExpense
Interest expense	(5,251)us-gaap_InterestExpense	(4,293)us-gaap_InterestExpense
Income before taxes	165,196us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	199,532us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax benefit (expense)	47,904us-gaap_IncomeTaxExpenseBenefit	(166)us-gaap_IncomeTaxExpenseBenefit
Net income attributable to noncontrolling interests	(39,662)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	(42,768)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Dividends on preference shares	(5,595)us-gaap_DividendsPreferredStock	(5,595)us-gaap_DividendsPreferredStock
Net income available to RenaissanceRe common shareholders	167,843us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	151,003us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net claims and claim expenses incurred – current accident year	98,998us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	75,608us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense
Net claims and claim expenses incurred – prior accident years	(22,145)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	(16,693)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
Net claims and claim expenses incurred – total	76,853us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1	58,915us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1
Net claims and claim expense ratio – current accident year	33.40%rnr_NetClaimsAndClaimsExpenseRatioCurrentYear	26.40%rnr_NetClaimsAndClaimsExpenseRatioCurrentYear
Net claims and claim expense ratio – prior accident years	(7.50%)rnr_NetClaimsAndClaimExpenseRatioPriorYears	(5.80%)rnr_NetClaimsAndClaimExpenseRatioPriorYears
Net claims and claim expense ratio – calendar year	25.90%us-gaap_LossRatio	20.60%us-gaap_LossRatio
Underwriting expense ratio	30.00%us-gaap_UnderwritingExpenseRatio	26.60%us-gaap_UnderwritingExpenseRatio
Combined ratio	55.90%us-gaap_CombinedRatio	47.20%us-gaap_CombinedRatio
Intersegment Eliminations
Segment Reporting Information [Line Items]
Gross premiums written	(100)us-gaap_PremiumsWrittenGross / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Catastrophe Reinsurance
Segment Reporting Information [Line Items]
Gross premiums written	389,247us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	467,711us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Net premiums written	222,640us-gaap_PremiumsWrittenNet / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	259,489us-gaap_PremiumsWrittenNet / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Net premiums earned	143,767us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	164,584us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Net claims and claim expenses incurred	7,594us-gaap_PolicyholderBenefitsAndClaimsIncurredNet / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	6,455us-gaap_PolicyholderBenefitsAndClaimsIncurredNet / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Acquisition expenses	7,654us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	7,126us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Operational expenses	20,363us-gaap_OperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	20,419us-gaap_OperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Underwriting income (loss)	108,156rnr_UnderwritingIncomeLossNet / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	130,584rnr_UnderwritingIncomeLossNet / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Net claims and claim expenses incurred – current accident year	24,124us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	12,529us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Net claims and claim expenses incurred – prior accident years	(16,530)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	(6,074)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Net claims and claim expenses incurred – total	7,594us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	6,455us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Net claims and claim expense ratio – current accident year	16.80%rnr_NetClaimsAndClaimsExpenseRatioCurrentYear / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	7.60%rnr_NetClaimsAndClaimsExpenseRatioCurrentYear / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Net claims and claim expense ratio – prior accident years	(11.50%)rnr_NetClaimsAndClaimExpenseRatioPriorYears / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	(3.70%)rnr_NetClaimsAndClaimExpenseRatioPriorYears / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Net claims and claim expense ratio – calendar year	5.30%us-gaap_LossRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	3.90%us-gaap_LossRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Underwriting expense ratio	19.50%us-gaap_UnderwritingExpenseRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	16.80%us-gaap_UnderwritingExpenseRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Combined ratio	24.80%us-gaap_CombinedRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	20.70%us-gaap_CombinedRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Specialty Reinsurance
Segment Reporting Information [Line Items]
Gross premiums written	124,291us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	154,290us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Net premiums written	103,915us-gaap_PremiumsWrittenNet / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	125,489us-gaap_PremiumsWrittenNet / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Net premiums earned	94,876us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	69,630us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Net claims and claim expenses incurred	39,588us-gaap_PolicyholderBenefitsAndClaimsIncurredNet / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	26,081us-gaap_PolicyholderBenefitsAndClaimsIncurredNet / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Acquisition expenses	20,689us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	16,547us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Operational expenses	13,290us-gaap_OperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	10,106us-gaap_OperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Underwriting income (loss)	21,309rnr_UnderwritingIncomeLossNet / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	16,896rnr_UnderwritingIncomeLossNet / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Net claims and claim expenses incurred – current accident year	49,264us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	41,922us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Net claims and claim expenses incurred – prior accident years	(9,676)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	(15,841)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Net claims and claim expenses incurred – total	39,588us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	26,081us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Net claims and claim expense ratio – current accident year	51.90%rnr_NetClaimsAndClaimsExpenseRatioCurrentYear / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	60.20%rnr_NetClaimsAndClaimsExpenseRatioCurrentYear / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Net claims and claim expense ratio – prior accident years	(10.20%)rnr_NetClaimsAndClaimExpenseRatioPriorYears / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	(22.70%)rnr_NetClaimsAndClaimExpenseRatioPriorYears / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Net claims and claim expense ratio – calendar year	41.70%us-gaap_LossRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	37.50%us-gaap_LossRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Underwriting expense ratio	35.80%us-gaap_UnderwritingExpenseRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	38.20%us-gaap_UnderwritingExpenseRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Combined ratio	77.50%us-gaap_CombinedRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	75.70%us-gaap_CombinedRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Lloyd's
Segment Reporting Information [Line Items]
Gross premiums written	130,130us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	83,259us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Net premiums written	77,569us-gaap_PremiumsWrittenNet / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	65,369us-gaap_PremiumsWrittenNet / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Net premiums earned	58,206us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	52,297us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Net claims and claim expenses incurred	29,843us-gaap_PolicyholderBenefitsAndClaimsIncurredNet / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	26,281us-gaap_PolicyholderBenefitsAndClaimsIncurredNet / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Acquisition expenses	14,693us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	10,567us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Operational expenses	11,940us-gaap_OperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	12,033us-gaap_OperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Underwriting income (loss)	1,730rnr_UnderwritingIncomeLossNet / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	3,416rnr_UnderwritingIncomeLossNet / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Net claims and claim expenses incurred – current accident year	25,610us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	21,157us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Net claims and claim expenses incurred – prior accident years	4,233us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	5,124us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Net claims and claim expenses incurred – total	29,843us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	26,281us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Net claims and claim expense ratio – current accident year	44.00%rnr_NetClaimsAndClaimsExpenseRatioCurrentYear / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	40.50%rnr_NetClaimsAndClaimsExpenseRatioCurrentYear / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Net claims and claim expense ratio – prior accident years	7.30%rnr_NetClaimsAndClaimExpenseRatioPriorYears / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	9.80%rnr_NetClaimsAndClaimExpenseRatioPriorYears / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Net claims and claim expense ratio – calendar year	51.30%us-gaap_LossRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	50.30%us-gaap_LossRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Underwriting expense ratio	45.70%us-gaap_UnderwritingExpenseRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	43.20%us-gaap_UnderwritingExpenseRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Combined ratio	97.00%us-gaap_CombinedRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	93.50%us-gaap_CombinedRatio / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Other
Segment Reporting Information [Line Items]
Gross premiums written	(90)us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	0us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net premiums written	(89)us-gaap_PremiumsWrittenNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	0us-gaap_PremiumsWrittenNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net premiums earned	(89)us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	23us-gaap_PremiumsEarnedNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net claims and claim expenses incurred	(172)us-gaap_PolicyholderBenefitsAndClaimsIncurredNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	98us-gaap_PolicyholderBenefitsAndClaimsIncurredNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Acquisition expenses	365us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	(540)us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Operational expenses	28us-gaap_OperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	66us-gaap_OperatingExpenses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Underwriting income (loss)	(310)rnr_UnderwritingIncomeLossNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	399rnr_UnderwritingIncomeLossNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net investment income	39,707us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	38,948us-gaap_NetInvestmentIncome / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net foreign exchange losses	(3,130)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	(1,061)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Equity in earnings of other ventures	5,295us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	4,199us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other income	1,539us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	62us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net realized and unrealized gains on investments	41,749us-gaap_GainLossOnInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	14,927us-gaap_GainLossOnInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Corporate expenses	(45,598)us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	(4,545)us-gaap_GeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Interest expense	(5,251)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	(4,293)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Income tax benefit (expense)	47,904us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	(166)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net income attributable to noncontrolling interests	(39,662)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	(42,768)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Dividends on preference shares	(5,595)us-gaap_DividendsPreferredStock / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	(5,595)us-gaap_DividendsPreferredStock / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net claims and claim expenses incurred – current accident year	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net claims and claim expenses incurred – prior accident years	(172)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	98us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net claims and claim expenses incurred – total	$ (172)us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	$ 98us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1 / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net claims and claim expense ratio – current accident year	0.00%rnr_NetClaimsAndClaimsExpenseRatioCurrentYear / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	0.00%rnr_NetClaimsAndClaimsExpenseRatioCurrentYear / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net claims and claim expense ratio – prior accident years	193.30%rnr_NetClaimsAndClaimExpenseRatioPriorYears / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	426.10%rnr_NetClaimsAndClaimExpenseRatioPriorYears / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Net claims and claim expense ratio – calendar year	193.30%us-gaap_LossRatio / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	426.10%us-gaap_LossRatio / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Underwriting expense ratio	(441.60%)us-gaap_UnderwritingExpenseRatio / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	(2060.90%)us-gaap_UnderwritingExpenseRatio / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Combined ratio	(248.30%)us-gaap_CombinedRatio / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	(1634.80%)us-gaap_CombinedRatio / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember

X

- Definition

Net claims and claim expense ratio - prior accident years is derived by dividing net claims and claim expenses - prior accident years by net premiums earned.

+ References

No definition available.

+ Details

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Namespace Prefix:	rnr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Net claims and claim expense ratio - current accident year is derived by dividing net claims and claim expense - current accident year by net premiums earned.

+ References

No definition available.

+ Details

Name:	rnr_NetClaimsAndClaimsExpenseRatioCurrentYear
Namespace Prefix:	rnr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Net premiums earned less net claims and claim expenses incurred, acquisition expenses and operational expenses directly related to underwriting activities.

+ References

No definition available.

+ Details

Name:	rnr_UnderwritingIncomeLossNet
Namespace Prefix:	rnr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Ratio of non-life losses and loss expenses, non-life acquisition expenses and non-life general and administrative expenses, to non-life net premiums earned.

+ References

No definition available.

+ Details

Name:	us-gaap_CombinedRatio
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of expense related to deferred policy acquisition costs.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 16

-Article 12



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

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