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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period	$ 310,544us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	$ 369,338us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Total unrealized gains (losses)
Included in net investment income	4,988rnr_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossDuringPeriodIncludedInInvestmentIncome	18,650rnr_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossDuringPeriodIncludedInInvestmentIncome
Total realized gains (losses)
Included in other income	1,316rnr_FairValueAssetsMeasuredOnRecurringBasisRealizedGainLossDuringPeriodIncludedInOtherIncome
Total foreign exchange gains (losses)	(2,492)rnr_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisForeignExchangeGainsLosses	(27)rnr_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisForeignExchangeGainsLosses
Purchases	86,159us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases	15,001us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
Settlements	(18,946)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements	(24,353)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
Balance at end of the period	381,569us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	378,609us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Net investment income
Total realized gains (losses)
Change in unrealized gains for the period included in earnings for assets held at the end of the period	4,988us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember	18,650us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember
Fixed maturity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period	15,660us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember	27,580us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember
Total unrealized gains (losses)
Included in net investment income	(186)rnr_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossDuringPeriodIncludedInInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember	9,558rnr_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossDuringPeriodIncludedInInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember
Total realized gains (losses)
Included in other income	0rnr_FairValueAssetsMeasuredOnRecurringBasisRealizedGainLossDuringPeriodIncludedInOtherIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember
Total foreign exchange gains (losses)	0rnr_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisForeignExchangeGainsLosses / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember	0rnr_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisForeignExchangeGainsLosses / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember
Purchases	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember
Settlements	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember
Balance at end of the period	15,474us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember	37,138us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember
Fixed maturity investments | Net investment income
Total realized gains (losses)
Change in unrealized gains for the period included in earnings for assets held at the end of the period	(186)us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember	9,558us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedMaturitiesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember
Other Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period	303,818us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember	344,248us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember
Total unrealized gains (losses)
Included in net investment income	5,014rnr_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossDuringPeriodIncludedInInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember	7,876rnr_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossDuringPeriodIncludedInInvestmentIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember
Total realized gains (losses)
Included in other income	0rnr_FairValueAssetsMeasuredOnRecurringBasisRealizedGainLossDuringPeriodIncludedInOtherIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember
Total foreign exchange gains (losses)	(2,498)rnr_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisForeignExchangeGainsLosses / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember	6rnr_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisForeignExchangeGainsLosses / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember
Purchases	5,738us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember	15,001us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember
Settlements	(18,946)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember	(24,353)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember
Balance at end of the period	293,126us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember	342,778us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember
Other Investments | Net investment income
Total realized gains (losses)
Change in unrealized gains for the period included in earnings for assets held at the end of the period	5,014us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember	7,876us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_OtherInvestmentsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember
Other Assets and Liabilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period	(8,934)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember	(2,490)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember
Total unrealized gains (losses)
Included in net investment income	160rnr_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossDuringPeriodIncludedInInvestmentIncome / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember	1,216rnr_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLossDuringPeriodIncludedInInvestmentIncome / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember
Total realized gains (losses)
Included in other income	1,316rnr_FairValueAssetsMeasuredOnRecurringBasisRealizedGainLossDuringPeriodIncludedInOtherIncome / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember
Total foreign exchange gains (losses)	6rnr_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisForeignExchangeGainsLosses / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember	(33)rnr_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisForeignExchangeGainsLosses / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember
Purchases	80,421us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember
Settlements	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember
Balance at end of the period	72,969us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember	(1,307)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember
Other Assets and Liabilities | Net investment income
Total realized gains (losses)
Change in unrealized gains for the period included in earnings for assets held at the end of the period	$ 160us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember	$ 1,216us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / us-gaap_FairValueByAssetClassAxis = rnr_OtherAssetsAndLiabilitiesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember

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- Definition

This item represents the amount of the total foreign exchange gains or losses for the period which are included in the statement of income in net foreign exchange gains or losses. Such foreign exchange gains or losses relate to those assets or liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

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Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

+ References

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

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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