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Reinsurance (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Reinsurance Recoverable | Largest reinsurance recoverable, Customer One |  |
Concentration risk percentage | 35.40%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_ReinsuranceRecoverableMember / us-gaap_ConcentrationRiskByTypeAxis = rnr_CustomerConcentrationRiskCustomerOneMember | 28.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_ReinsuranceRecoverableMember / us-gaap_ConcentrationRiskByTypeAxis = rnr_CustomerConcentrationRiskCustomerOneMember
Reinsurance Recoverable | Largest reinsurance recoverable, Customer Two |  |
Concentration risk percentage | 14.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_ReinsuranceRecoverableMember / us-gaap_ConcentrationRiskByTypeAxis = rnr_CustomerConcentrationRiskCustomerTwoMember | 19.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_ReinsuranceRecoverableMember / us-gaap_ConcentrationRiskByTypeAxis = rnr_CustomerConcentrationRiskCustomerTwoMember
Reinsurance Recoverable | Largest reinsurance recoverable, Customer Three |  |
Concentration risk percentage | 7.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_ReinsuranceRecoverableMember / us-gaap_ConcentrationRiskByTypeAxis = rnr_CustomerConcentrationRiskCustomerThreeMember | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_ReinsuranceRecoverableMember / us-gaap_ConcentrationRiskByTypeAxis = rnr_CustomerConcentrationRiskCustomerThreeMember
Allowance for Reinsurance Recoverable | Largest reinsurance recoverable, Customer One |  |
Concentration risk percentage | 17.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AllowanceForReinsuranceRecoverableMember / us-gaap_ConcentrationRiskByTypeAxis = rnr_CustomerConcentrationRiskCustomerOneMember | 14.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AllowanceForReinsuranceRecoverableMember / us-gaap_ConcentrationRiskByTypeAxis = rnr_CustomerConcentrationRiskCustomerOneMember
Allowance for Reinsurance Recoverable | Largest reinsurance recoverable, Customer Two |  |
Concentration risk percentage | 4.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AllowanceForReinsuranceRecoverableMember / us-gaap_ConcentrationRiskByTypeAxis = rnr_CustomerConcentrationRiskCustomerTwoMember | 12.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AllowanceForReinsuranceRecoverableMember / us-gaap_ConcentrationRiskByTypeAxis = rnr_CustomerConcentrationRiskCustomerTwoMember
Allowance for Reinsurance Recoverable | Largest reinsurance recoverable, Customer Three |  |
Concentration risk percentage | 2.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AllowanceForReinsuranceRecoverableMember / us-gaap_ConcentrationRiskByTypeAxis = rnr_CustomerConcentrationRiskCustomerThreeMember | 3.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AllowanceForReinsuranceRecoverableMember / us-gaap_ConcentrationRiskByTypeAxis = rnr_CustomerConcentrationRiskCustomerThreeMember
Allowance for Reinsurance Recoverable |  |
Valuation allowance recorded against reinsurance recoverable | 1.0 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForReinsuranceRecoverableMember | 1.7 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForReinsuranceRecoverableMember

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