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Reserve for Claims and Claim Expenses (Narrative) (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 01, 2012
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	$ 143,798,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	$ 143,954,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	$ 157,969,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
Reinsurance Balances Payable
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Aggregate deposit liabilities	39,000,000us-gaap_DepositContractsLiabilities / us-gaap_BalanceSheetLocationAxis = rnr_ReinsuranceBalancesPayableMember	39,700,000us-gaap_DepositContractsLiabilities / us-gaap_BalanceSheetLocationAxis = rnr_ReinsuranceBalancesPayableMember
Aggregate deposit assets
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Aggregate deposit assets	0us-gaap_DepositContractsAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember	0us-gaap_DepositContractsAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember
Deposit Contracts, Underwriting Risk Only
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Increase (decrease) in net claims and claim expenses related to assumed reinsurance contracts	(300,000)us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_DepositContractsUnderwritingRiskOnlyMember	(400,000)us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_DepositContractsUnderwritingRiskOnlyMember	(100,000)us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_DepositContractsUnderwritingRiskOnlyMember
Deposit Contracts, Timing Risk Only
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Increase (decrease) in other income related to assumed reinsurance contracts	(100,000)rnr_ReinsuranceEffectOnOtherIncomeAmountAssumed / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_DepositContractsTimingRiskOnlyMember	(100,000)rnr_ReinsuranceEffectOnOtherIncomeAmountAssumed / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_DepositContractsTimingRiskOnlyMember	(7,500,000)rnr_ReinsuranceEffectOnOtherIncomeAmountAssumed / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_DepositContractsTimingRiskOnlyMember
Catastrophe
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	92,366,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember	111,496,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember	124,215,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember
Catastrophe | Large Catastrophe Event
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	65,537,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember	94,527,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember	76,390,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember
Catastrophe | Hurricanes Katrina, Rita and Wilma (2005)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses			7,730,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesKatrinaRitaAndWilma2005Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember
Catastrophe | Hurricanes Gustav and Ike (2008)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	6,647,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember	16,665,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember	20,467,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember
Catastrophe | European Floods (2013)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	7,552,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_EuropeanFloods2013Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember
Catastrophe | Storm Sandy (2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	24,232,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_StormSandy2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember	48,285,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_StormSandy2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember
Catastrophe | Tohoku Earthquake and Tsunami (2011)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	5,131,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember	19,033,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember	3,896,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember
Catastrophe | New Zealand Earthquake (2011)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses		10,944,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember	(17,912,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember
Catastrophe | New Zealand Earthquake (2010)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	(24,692,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember	(11,340,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember	(3,570,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember
Catastrophe | U.S. PCS 70 and 73 Wind and Thunderstorm (2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	(13,362,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS73WindandThunderstorm2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember
Catastrophe | Hurricane Isaac (2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses		(2,610,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIsaac2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember
Catastrophe | Thailand Floods (2011)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	11,754,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_ThailandFloods2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember		9,433,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_ThailandFloods2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember
Catastrophe | Hurricane Irene (2011)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	4,506,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIrene2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember		7,130,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIrene2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember
Catastrophe | Other
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	13,704,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember	5,306,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember	3,953,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember
Catastrophe | Small Catastrophe Event
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	26,829,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember	16,969,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember	47,825,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember
Catastrophe | U.S. PCS 70 Wind and Thunderstorm (2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses		(8,225,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS70WindandThunderstorm2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember
Catastrophe | April and May U.S. Tornadoes 2011
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	13,939,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_AprilandMayU.S.Tornadoes2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember
Catastrophe | U.S. PCS 24 Wind and Thunderstorm (2013)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	6,712,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS24WindandThunderstorm2013Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember
Catastrophe | LIBOR (2011 and 2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	11,750,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LIBOR2011and2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember
Catastrophe | Subprime (2007)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	(5,049,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_Subprime2007Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember
Actuarial Assumption Changes
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses		10,158,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ChangeInActuarialAssumptionMember	13,114,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ChangeInActuarialAssumptionMember
Actual Reported Claims Less than Expected Claims
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	51,432,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember	22,300,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember	20,640,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember
Attritional Claims and Claim Expenses
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	51,432,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember	32,458,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember	33,754,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember
Catastrophe Reinsurance
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	65,511,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	102,037,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	110,568,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Catastrophe
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	65,511,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	102,037,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	110,568,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Catastrophe | Large Catastrophe Event
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	47,506,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	85,068,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	62,743,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Catastrophe | Hurricanes Katrina, Rita and Wilma (2005)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Initial estimated ultimate claim	1,300,000,000rnr_LiabilityForClaimsAndClaimsAdjustmentExpenseInitialEstimatedClaims / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesKatrinaRitaAndWilma2005Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Liability for unpaid claims and claim expenses			6,420,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesKatrinaRitaAndWilma2005Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Catastrophe | Hurricanes Gustav and Ike (2008)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Initial estimated ultimate claim	530,000,000rnr_LiabilityForClaimsAndClaimsAdjustmentExpenseInitialEstimatedClaims / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Liability for unpaid claims and claim expenses	6,647,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	16,261,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	17,541,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Catastrophe | New Zealand Earthquake, Tohoku Earthquake, United States Tornadoes, Australian Floods, Hurricane Irene, Thailand Floods
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Initial estimated ultimate claim	1,100,000,000rnr_LiabilityForClaimsAndClaimsAdjustmentExpenseInitialEstimatedClaims / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_A2011NewZealandEarthquaketheTohokuEarthquakethelargeU.S.tornadoesfloodinginAustraliacertainaggregatelossesHurricaneIreneandtheThailandFloodsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Catastrophe | European Floods (2013)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	7,552,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_EuropeanFloods2013Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Catastrophe | Storm Sandy (2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	20,104,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_StormSandy2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	44,460,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_StormSandy2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Catastrophe | Tohoku Earthquake and Tsunami (2011)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	3,489,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	18,033,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	3,896,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Catastrophe | New Zealand Earthquake (2011)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses		10,944,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	(17,912,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Catastrophe | New Zealand Earthquake (2010)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	(24,692,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	(11,040,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	(3,570,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Catastrophe | U.S. PCS 70 and 73 Wind and Thunderstorm (2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	(13,362,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS73WindandThunderstorm2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Catastrophe | Hurricane Isaac (2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses		(2,610,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIsaac2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Catastrophe | Thailand Floods (2011)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	9,254,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_ThailandFloods2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember		3,933,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_ThailandFloods2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Catastrophe | Hurricane Irene (2011)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	4,506,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIrene2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember		4,630,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIrene2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Catastrophe | Other
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	10,644,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	776,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	2,542,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Catastrophe | Small Catastrophe Event
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	18,005,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	16,969,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	47,825,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Catastrophe | U.S. PCS 70 Wind and Thunderstorm (2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses		(8,225,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS70WindandThunderstorm2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Catastrophe | April and May U.S. Tornadoes 2011
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	13,939,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_AprilandMayU.S.Tornadoes2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Catastrophe | U.S. PCS 24 Wind and Thunderstorm (2013)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	6,712,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS24WindandThunderstorm2013Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Catastrophe | LIBOR (2011 and 2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LIBOR2011and2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Catastrophe | Subprime (2007)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_Subprime2007Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Catastrophe Claims and Claim Expense Excluding Certain Specific Events
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses		(34,214,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_CatastropheClaimsandClaimExpenseExcludingCertainSpecificEventsMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	84,225,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_CatastropheClaimsandClaimExpenseExcludingCertainSpecificEventsMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Actuarial Assumption Changes
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses		0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ChangeInActuarialAssumptionMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ChangeInActuarialAssumptionMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Actual Reported Claims Less than Expected Claims
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | Attritional Claims and Claim Expenses
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Specialty Reinsurance
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	55,909,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	34,111,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	34,146,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | Catastrophe
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	11,419,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	2,463,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	3,000,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | Catastrophe | Large Catastrophe Event
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	11,419,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	2,463,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	3,000,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | Catastrophe | Hurricanes Katrina, Rita and Wilma (2005)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses			3,000,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesKatrinaRitaAndWilma2005Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | Catastrophe | Hurricanes Gustav and Ike (2008)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | Catastrophe | European Floods (2013)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_EuropeanFloods2013Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | Catastrophe | Storm Sandy (2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_StormSandy2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_StormSandy2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | Catastrophe | Tohoku Earthquake and Tsunami (2011)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	1,642,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	1,000,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | Catastrophe | New Zealand Earthquake (2011)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses		0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | Catastrophe | New Zealand Earthquake (2010)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	(300,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | Catastrophe | U.S. PCS 70 and 73 Wind and Thunderstorm (2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS73WindandThunderstorm2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | Catastrophe | Hurricane Isaac (2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses		0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIsaac2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | Catastrophe | Thailand Floods (2011)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	2,500,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_ThailandFloods2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember		0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_ThailandFloods2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | Catastrophe | Hurricane Irene (2011)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIrene2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember		0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIrene2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | Catastrophe | Other
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	1,826,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	1,763,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | Catastrophe | Small Catastrophe Event
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | Catastrophe | U.S. PCS 70 Wind and Thunderstorm (2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses		0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS70WindandThunderstorm2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | Catastrophe | April and May U.S. Tornadoes 2011
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_AprilandMayU.S.Tornadoes2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | Catastrophe | U.S. PCS 24 Wind and Thunderstorm (2013)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS24WindandThunderstorm2013Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | Catastrophe | LIBOR (2011 and 2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	10,500,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LIBOR2011and2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | Catastrophe | Subprime (2007)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	(5,049,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_Subprime2007Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | Actuarial Assumption Changes
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses		10,432,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ChangeInActuarialAssumptionMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	14,399,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ChangeInActuarialAssumptionMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | Reported Claims Less than Expected Including Catastrophe Events
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses		23,679,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessthanExpectedIncludingCertainCatastropheEventsMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | Actual Reported Claims Less than Expected Claims
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	44,490,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	21,216,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	16,747,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | Attritional Claims and Claim Expenses
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	44,490,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	31,648,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	31,146,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Lloyd's
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	16,241,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	8,256,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	16,202,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | Catastrophe
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	9,299,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	5,267,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	9,476,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | Catastrophe | Large Catastrophe Event
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	6,612,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	5,267,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	9,476,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | Catastrophe | Hurricanes Katrina, Rita and Wilma (2005)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses			0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesKatrinaRitaAndWilma2005Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | Catastrophe | Hurricanes Gustav and Ike (2008)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | Catastrophe | European Floods (2013)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_EuropeanFloods2013Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | Catastrophe | Storm Sandy (2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	4,128,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_StormSandy2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	3,825,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_StormSandy2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | Catastrophe | Tohoku Earthquake and Tsunami (2011)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | Catastrophe | New Zealand Earthquake (2011)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses		0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | Catastrophe | New Zealand Earthquake (2010)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | Catastrophe | U.S. PCS 70 and 73 Wind and Thunderstorm (2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS73WindandThunderstorm2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | Catastrophe | Hurricane Isaac (2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses		0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIsaac2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | Catastrophe | Thailand Floods (2011)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_ThailandFloods2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember		5,500,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_ThailandFloods2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | Catastrophe | Hurricane Irene (2011)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIrene2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember		2,500,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIrene2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | Catastrophe | Other
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	1,234,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	1,442,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	1,476,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | Catastrophe | Small Catastrophe Event
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	2,687,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | Catastrophe | U.S. PCS 70 Wind and Thunderstorm (2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses		0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS70WindandThunderstorm2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | Catastrophe | April and May U.S. Tornadoes 2011
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_AprilandMayU.S.Tornadoes2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | Catastrophe | U.S. PCS 24 Wind and Thunderstorm (2013)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS24WindandThunderstorm2013Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | Catastrophe | LIBOR (2011 and 2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	1,250,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LIBOR2011and2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | Catastrophe | Subprime (2007)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_Subprime2007Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | Actuarial Assumption Changes
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses		(274,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ChangeInActuarialAssumptionMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	(1,285,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ChangeInActuarialAssumptionMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | Actuarial Assumption Changes | Other
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses			1,300,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ChangeInActuarialAssumptionMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | Actual Reported Claims Less than Expected Claims
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	6,942,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	3,263,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	8,011,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | Attritional Claims and Claim Expenses
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	6,942,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	2,989,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	6,726,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Other
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	6,137,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	(450,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	(2,947,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Catastrophe
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	6,137,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	1,729,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	1,171,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Catastrophe | Large Catastrophe Event
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	1,729,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	1,171,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Catastrophe | Hurricanes Katrina, Rita and Wilma (2005)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses			(1,690,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesKatrinaRitaAndWilma2005Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Catastrophe | Hurricanes Gustav and Ike (2008)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	404,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	2,926,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Catastrophe | European Floods (2013)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_EuropeanFloods2013Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Catastrophe | Storm Sandy (2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_StormSandy2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_StormSandy2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Catastrophe | Tohoku Earthquake and Tsunami (2011)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Catastrophe | New Zealand Earthquake (2011)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses		0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Catastrophe | New Zealand Earthquake (2010)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Catastrophe | U.S. PCS 70 and 73 Wind and Thunderstorm (2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS73WindandThunderstorm2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Catastrophe | Hurricane Isaac (2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses		0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIsaac2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Catastrophe | Thailand Floods (2011)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_ThailandFloods2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember		0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_ThailandFloods2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Catastrophe | Hurricane Irene (2011)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIrene2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember		0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIrene2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Catastrophe | Other
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	1,325,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	(65,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Catastrophe | Small Catastrophe Event
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	6,137,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Catastrophe | U.S. PCS 70 Wind and Thunderstorm (2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses		0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS70WindandThunderstorm2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Catastrophe | April and May U.S. Tornadoes 2011
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_AprilandMayU.S.Tornadoes2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Catastrophe | U.S. PCS 24 Wind and Thunderstorm (2013)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS24WindandThunderstorm2013Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Catastrophe | LIBOR (2011 and 2012)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LIBOR2011and2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Catastrophe | Subprime (2007)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_Subprime2007Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Actuarial Assumption Changes
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses		0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ChangeInActuarialAssumptionMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ChangeInActuarialAssumptionMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Actual Reported Claims Less than Expected Claims
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	(2,179,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	(4,118,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Attritional Claims and Claim Expenses
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses	0us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	(2,179,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	(4,118,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Loss Portfolio Transfer, Cash Consideration Paid
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses				(36,500,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_LossPortfolioTransferCashConsiderationPaidMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Loss Portfolio Transfer, Attritional Claims and Claim Expenses
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses				29,100,000us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_LossPortfolioTransferAttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Loss Portfolio Transfer, Loss Recognized
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liability for unpaid claims and claim expenses				$ (7,400,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_LossPortfolioTransferLossRecognizedMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember

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- Definition

Liability for Claims and Claims Adjustment Expense, Initial Estimated Claims

+ References

No definition available.

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- Definition

Reinsurance Effect on Other Income, Amount Assumed

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- Definition

Carrying amount of assets as of the balance sheet date pertaining to amounts paid by the insured (including a ceding company) under insurance or reinsurance contracts for which insurance risk is not transferred.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 340

-SubTopic 30

-Section 50

-Paragraph 1

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- Definition

Carrying amount of liabilities as of the balance sheet date pertaining to amounts received by the insurer or reinsurer from the insured (including a ceding company) under insurance or reinsurance contracts for which insurance risk is not transferred.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 340

-SubTopic 30

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6387650&loc=d3e9420-108338

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- Definition

Amount of policy benefits and costs incurred for policies assumed.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 20

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6811-158387

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- Definition

Amount of expense for claims incurred in prior reporting periods and related claims settlement costs.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 235

-Section S99

-Paragraph 3

-Subparagraph (SX 210.12-18)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 18

-Article 12

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