XML 13 R54.htm IDEA: XBRL DOCUMENT v2.4.1.9

Fair Value Measurements (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	$ 826,774,000us-gaap_LongTermDebt		249,522,000us-gaap_LongTermDebt
Other assets and (liabilities)	78,822,000rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis		(13,908,000)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis
Net unrealized gains (losses) recognized in earnings	4,885,000us-gaap_UnrealizedGainLossOnInvestments	4,980,000us-gaap_UnrealizedGainLossOnInvestments
Other Investments | Net investment income
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized gains (losses) recognized in earnings	4,900,000us-gaap_UnrealizedGainLossOnInvestments / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_OtherInvestmentsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember	5,000,000us-gaap_UnrealizedGainLossOnInvestments / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_OtherInvestmentsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember
Other Assets and Liabilities | Other income (loss)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized gains (losses) recognized in earnings	0us-gaap_UnrealizedGainLossOnInvestments / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = rnr_OtherAssetsAndLiabilitiesMember / us-gaap_IncomeStatementLocationAxis = rnr_OtherOperatingIncomeExpenseNetMember	0us-gaap_UnrealizedGainLossOnInvestments / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = rnr_OtherAssetsAndLiabilitiesMember / us-gaap_IncomeStatementLocationAxis = rnr_OtherOperatingIncomeExpenseNetMember
RenRe North America Holdings Inc.
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes, fair value	863,566,000us-gaap_LongTermDebtFairValue / dei_LegalEntityAxis = us-gaap_SubsidiariesMember		279,000,000us-gaap_LongTermDebtFairValue / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
5.75% Senior Notes Due March 15, 2020 | RenRe North America Holdings Inc.
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	249,545,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = rnr_A5.75SeniorNotesDueMarch152020Member / dei_LegalEntityAxis = us-gaap_SubsidiariesMember		249,522,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = rnr_A5.75SeniorNotesDueMarch152020Member / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Senior notes, fair value	285,000,000us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = rnr_A5.75SeniorNotesDueMarch152020Member / dei_LegalEntityAxis = us-gaap_SubsidiariesMember		279,000,000us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = rnr_A5.75SeniorNotesDueMarch152020Member / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Quoted Prices In Active Markets For Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets and (liabilities)	(492,000)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member		(569,000)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets and (liabilities)	6,345,000rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member		(4,405,000)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	381,569,000us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Other assets and (liabilities)	72,969,000rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member		(8,934,000)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Significant Unobservable Inputs (Level 3) | Corporate | Discounted Cash Flow Valuation Technique
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	15,474,000us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = rnr_DiscountedCashFlowValuationTechniqueMember
Significant Unobservable Inputs (Level 3) | Corporate | Weighted Average or Actual | Discounted Cash Flow Valuation Technique
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Credit spread	1.20%us-gaap_FairValueInputsEntityCreditRisk / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = rnr_WeightedAverageOrActualMember / us-gaap_ValuationTechniqueAxis = rnr_DiscountedCashFlowValuationTechniqueMember
Liquidity discount	1.00%us-gaap_FairValueInputsDiscountForLackOfMarketability / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = rnr_WeightedAverageOrActualMember / us-gaap_ValuationTechniqueAxis = rnr_DiscountedCashFlowValuationTechniqueMember
Risk-free rate	0.20%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = rnr_WeightedAverageOrActualMember / us-gaap_ValuationTechniqueAxis = rnr_DiscountedCashFlowValuationTechniqueMember
Dividend rate	6.50%us-gaap_FairValueAssumptionsExpectedDividendRate / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = rnr_WeightedAverageOrActualMember / us-gaap_ValuationTechniqueAxis = rnr_DiscountedCashFlowValuationTechniqueMember
Significant Unobservable Inputs (Level 3) | Private equity partnerships | Net Asset Valuation Technique
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	271,074,000us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByAssetClassAxis = us-gaap_PrivateEquityFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = rnr_NetAssetValuationTechniqueMember
Significant Unobservable Inputs (Level 3) | Senior secured bank loan funds | Net Asset Valuation Technique
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	19,679,000us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByAssetClassAxis = rnr_SeniorSecuredBankLoanFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = rnr_NetAssetValuationTechniqueMember
Significant Unobservable Inputs (Level 3) | Senior secured bank loan funds | Weighted Average or Actual | Net Asset Valuation Technique
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated performance	0.70%rnr_FairValueInputsEstimatedPerformance / us-gaap_FairValueByAssetClassAxis = rnr_SeniorSecuredBankLoanFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = rnr_WeightedAverageOrActualMember / us-gaap_ValuationTechniqueAxis = rnr_NetAssetValuationTechniqueMember
Significant Unobservable Inputs (Level 3) | Hedge funds | Net Asset Valuation Technique
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	2,373,000us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByAssetClassAxis = us-gaap_HedgeFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = rnr_NetAssetValuationTechniqueMember
Significant Unobservable Inputs (Level 3) | Hedge funds | Minimum | Net Asset Valuation Technique
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated performance	0.00%rnr_FairValueInputsEstimatedPerformance / us-gaap_FairValueByAssetClassAxis = us-gaap_HedgeFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = rnr_NetAssetValuationTechniqueMember
Significant Unobservable Inputs (Level 3) | Hedge funds | Maximum | Net Asset Valuation Technique
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated performance	0.00%rnr_FairValueInputsEstimatedPerformance / us-gaap_FairValueByAssetClassAxis = us-gaap_HedgeFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = rnr_NetAssetValuationTechniqueMember
Significant Unobservable Inputs (Level 3) | Hedge funds | Weighted Average or Actual | Net Asset Valuation Technique
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated performance	0.00%rnr_FairValueInputsEstimatedPerformance / us-gaap_FairValueByAssetClassAxis = us-gaap_HedgeFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_RangeAxis = rnr_WeightedAverageOrActualMember / us-gaap_ValuationTechniqueAxis = rnr_NetAssetValuationTechniqueMember
Significant Unobservable Inputs (Level 3) | Reinsurance deposit asset | Internal Valuation Model Valuation Technique
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	82,298,000us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByAssetClassAxis = rnr_AssumedandCededReInsuranceContractsGroupOneMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = rnr_InternalValuationModelValuationTechniqueMember
Significant Unobservable Inputs (Level 3) | Assumed reinsurance contract | Internal Valuation Model Valuation Technique
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value	(1,116,000)us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByAssetClassAxis = rnr_AssumedandCededReInsuranceContractsGroupTwoMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = rnr_InternalValuationModelValuationTechniqueMember
Significant Unobservable Inputs (Level 3) | Assumed and ceded reinsurance contract | Internal Valuation Model Valuation Technique
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value	(8,189,000)us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByAssetClassAxis = rnr_AssumedandCededReInsuranceContractsGroupThreeMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = rnr_InternalValuationModelValuationTechniqueMember
Significant Unobservable Inputs (Level 3) | Weather Contract | Internal Valuation Model Valuation Technique
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value	(24,000)us-gaap_LiabilitiesFairValueDisclosureRecurring / us-gaap_FairValueByAssetClassAxis = rnr_WeatherContractMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_ValuationTechniqueAxis = rnr_InternalValuationModelValuationTechniqueMember
U.S. treasuries
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	0.80%rnr_WeightedAverageEffectiveYield / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember		1.00%rnr_WeightedAverageEffectiveYield / us-gaap_InvestmentTypeAxis = us-gaap_USTreasurySecuritiesMember
Agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.60%rnr_WeightedAverageEffectiveYield / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember		1.20%rnr_WeightedAverageEffectiveYield / us-gaap_InvestmentTypeAxis = us-gaap_AgencySecuritiesMember
Municipals
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	2.40%rnr_WeightedAverageEffectiveYield / us-gaap_InvestmentTypeAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Non-U.S. government (Sovereign Debt)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.00%rnr_WeightedAverageEffectiveYield / us-gaap_InvestmentTypeAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember		1.10%rnr_WeightedAverageEffectiveYield / us-gaap_InvestmentTypeAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember
Non-U.S. government-backed corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	0.90%rnr_WeightedAverageEffectiveYield / us-gaap_InvestmentTypeAxis = rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember		1.10%rnr_WeightedAverageEffectiveYield / us-gaap_InvestmentTypeAxis = rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember
Corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.00%rnr_WeightedAverageEffectiveYield / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember		3.20%rnr_WeightedAverageEffectiveYield / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Agency mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.70%rnr_WeightedAverageEffectiveYield / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		2.30%rnr_WeightedAverageEffectiveYield / us-gaap_InvestmentTypeAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Weighted average life	5 years 4 months 24 days		5 years 7 months 6 days
Non-agency prime residential mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.40%rnr_WeightedAverageEffectiveYield / us-gaap_InvestmentTypeAxis = rnr_NonAgencyPrimeResidentialMortgageBackedSecuritiesMember		3.40%rnr_WeightedAverageEffectiveYield / us-gaap_InvestmentTypeAxis = rnr_NonAgencyPrimeResidentialMortgageBackedSecuritiesMember
Weighted average life	4 years		4 years 1 month 6 days
AltA non-agency mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	4.00%rnr_WeightedAverageEffectiveYield / us-gaap_InvestmentTypeAxis = rnr_AltaNonAgencyMortgageBackedSecuritiesMember		4.30%rnr_WeightedAverageEffectiveYield / us-gaap_InvestmentTypeAxis = rnr_AltaNonAgencyMortgageBackedSecuritiesMember
Weighted average life	5 years 0 months 0 days		5 years
Commercial mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.90%rnr_WeightedAverageEffectiveYield / us-gaap_InvestmentTypeAxis = us-gaap_CommercialMortgageBackedSecuritiesMember		2.10%rnr_WeightedAverageEffectiveYield / us-gaap_InvestmentTypeAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Weighted average life	3 years 1 month		3 years 6 months 0 days
Asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.30%rnr_WeightedAverageEffectiveYield / us-gaap_InvestmentTypeAxis = us-gaap_AssetBackedSecuritiesMember		1.50%rnr_WeightedAverageEffectiveYield / us-gaap_InvestmentTypeAxis = us-gaap_AssetBackedSecuritiesMember
Weighted average life	2 years 7 months 6 days		2 years 6 months
Restricted stock units (RSUs) | Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets and (liabilities)	(1,500,000)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Senior secured bank loan funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment in closed end fund	19,700,000rnr_InvestmentInClosedEndFund / us-gaap_InvestmentTypeAxis = rnr_SeniorSecuredBankLoanFundsMember
Senior secured bank loan funds | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets	4 years
Senior secured bank loan funds | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets	5 years
Private equity partnerships | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets	7 years
Private equity partnerships | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets	10 years
Private equity partnerships | Significant Unobservable Inputs (Level 3) | Net Asset Valuation Technique
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	271,074,000us-gaap_AssetsFairValueDisclosureRecurring / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = us-gaap_PrivateEquityFundsMember / us-gaap_ValuationTechniqueAxis = rnr_NetAssetValuationTechniqueMember
Private equity partnerships | Significant Unobservable Inputs (Level 3) | Minimum | Net Asset Valuation Technique
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated performance	(12.60%)rnr_FairValueInputsEstimatedPerformance / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = us-gaap_PrivateEquityFundsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = rnr_NetAssetValuationTechniqueMember
Private equity partnerships | Significant Unobservable Inputs (Level 3) | Maximum | Net Asset Valuation Technique
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated performance	23.00%rnr_FairValueInputsEstimatedPerformance / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = us-gaap_PrivateEquityFundsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = rnr_NetAssetValuationTechniqueMember
Private equity partnerships | Significant Unobservable Inputs (Level 3) | Weighted Average or Actual | Net Asset Valuation Technique
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated performance	4.70%rnr_FairValueInputsEstimatedPerformance / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = us-gaap_PrivateEquityFundsMember / us-gaap_RangeAxis = rnr_WeightedAverageOrActualMember / us-gaap_ValuationTechniqueAxis = rnr_NetAssetValuationTechniqueMember
Hedge funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Hedge fund side pocket investments	$ 2,400,000rnr_NonredeemableSidePocketInvestments / us-gaap_InvestmentTypeAxis = us-gaap_HedgeFundsMember

X

- Definition

This item represents the weighted average life in years of debt securities.

+ References

No definition available.

+ Details

Name:	rnr_DebtSecuritiesWeightedAverageLife
Namespace Prefix:	rnr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Estimated percentage return for the period on fair value at beginning of period.

+ References

No definition available.

+ Details

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

X

- Definition

This item represents senior secured bank loan funds in a closed end fund, which the Company has no right to redeem.

+ References

No definition available.

+ Details

Name:	rnr_InvestmentInClosedEndFund
Namespace Prefix:	rnr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents 'side pocket' investments which are not redeemable at the option of the shareholder.

+ References

No definition available.

+ Details

Name:	rnr_NonredeemableSidePocketInvestments
Namespace Prefix:	rnr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Other Assets And liabilities Measured on Recurring Basis

+ References

No definition available.

+ Details

Name:	rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis
Namespace Prefix:	rnr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the weighted average effective yield percentage of debt securities.

+ References

No definition available.

+ Details

Name:	rnr_WeightedAverageEffectiveYield
Namespace Prefix:	rnr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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

X

- Definition

Risk-free interest rate assumption used in valuing an instrument.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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

X

- Details

Name:	us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Adjustment to the discount rate used to measure fair value for lack of ability to convert business interests into cash quickly.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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

X

- Definition

Risk associated with risk of default, credit spread risk and downgrade risk, expressed as a percentage, used as an input to measure fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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

X

- Definition

Estimate remaining period the underlying assets are expected to be liquidated by the investees for investments for which net asset value per share is calculated (including by unit, membership interest, or other ownership interest unit measure), in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 6A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=SL6742756-110258

+ Details

Name:	us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLiquidatingInvestmentRemainingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity.

+ References

No definition available.

+ Details

Name:	us-gaap_LiabilitiesFairValueDisclosureRecurring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

Name:	us-gaap_UnrealizedGainLossOnInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=us-gaap_SubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=rnr_A5.75SeniorNotesDueMarch152020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_EligibleItemOrGroupForFairValueOptionAxis=rnr_OtherAssetsAndLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_EligibleItemOrGroupForFairValueOptionAxis=us-gaap_OtherInvestmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=rnr_AltaNonAgencyMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=rnr_NonAgencyPrimeResidentialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=rnr_SeniorSecuredBankLoanFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_AgencySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_ForeignGovernmentDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_HedgeFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_PrivateEquityFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: