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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | $ 4,783,570 us-gaap_MarketableSecuritiesFixedMaturities | $ 4,843,277 us-gaap_MarketableSecuritiesFixedMaturities
Short-term investments | 1,013,222 us-gaap_OtherShortTermInvestments | 1,044,779 us-gaap_OtherShortTermInvestments
Equity investments trading | 322,098 us-gaap_TradingSecuritiesEquity | 254,776 us-gaap_TradingSecuritiesEquity
Other investments | 504,147 us-gaap_OtherInvestments | 573,264 us-gaap_OtherInvestments
Total other assets and (liabilities) | (13,908)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis | (8,233)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis
Total assets and liabilities measured on recurring basis | 6,609,129 rnr_TotalAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasis | 6,707,863 rnr_TotalAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasis
Quoted Prices In Active Markets For Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 1,671,471 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 1,352,413 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Short-term investments | 0 us-gaap_OtherShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_OtherShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Equity investments trading | 322,098 us-gaap_TradingSecuritiesEquity / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 254,776 us-gaap_TradingSecuritiesEquity / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Other investments | 0 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Total other assets and (liabilities) | (569)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 823 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Total assets and liabilities measured on recurring basis | 1,993,000 rnr_TotalAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 1,608,012 rnr_TotalAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 3,096,439 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 3,463,284 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Short-term investments | 1,013,222 us-gaap_OtherShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 1,044,779 us-gaap_OtherShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Equity investments trading | 0 us-gaap_TradingSecuritiesEquity / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 us-gaap_TradingSecuritiesEquity / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Other investments | 200,329 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 229,016 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Total other assets and (liabilities) | (4,405)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | (6,566)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Total assets and liabilities measured on recurring basis | 4,305,585 rnr_TotalAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 4,730,513 rnr_TotalAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 15,660 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 27,580 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Short-term investments | 0 us-gaap_OtherShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_OtherShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Equity investments trading | 0 us-gaap_TradingSecuritiesEquity / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_TradingSecuritiesEquity / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Other investments | 303,818 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 344,248 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Total other assets and (liabilities) | (8,934)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | (2,490)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Total assets and liabilities measured on recurring basis | 310,544 rnr_TotalAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 369,338 rnr_TotalAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
U.S. treasuries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 1,671,471 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USTreasurySecuritiesMember | 1,352,413 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USTreasurySecuritiesMember
U.S. treasuries | Quoted Prices In Active Markets For Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 1,671,471 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USTreasurySecuritiesMember | 1,352,413 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USTreasurySecuritiesMember
U.S. treasuries | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USTreasurySecuritiesMember | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USTreasurySecuritiesMember
U.S. treasuries | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USTreasurySecuritiesMember | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_USTreasurySecuritiesMember
Agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 96,208 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_AgencySecuritiesMember | 186,050 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_AgencySecuritiesMember
Agencies | Quoted Prices In Active Markets For Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_AgencySecuritiesMember | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_AgencySecuritiesMember
Agencies | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 96,208 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_AgencySecuritiesMember | 186,050 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_AgencySecuritiesMember
Agencies | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_AgencySecuritiesMember | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_AgencySecuritiesMember
Non-U.S. government (Sovereign Debt) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 280,651 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember | 334,580 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember
Non-U.S. government (Sovereign Debt) | Quoted Prices In Active Markets For Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember
Non-U.S. government (Sovereign Debt) | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 280,651 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember | 334,580 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember
Non-U.S. government (Sovereign Debt) | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember
Non-U.S. government-backed corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 146,467 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByMeasurementBasisAxis = rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember | 237,479 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByMeasurementBasisAxis = rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember
Non-U.S. government-backed corporate | Quoted Prices In Active Markets For Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember
Non-U.S. government-backed corporate | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 146,467 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember | 237,479 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember
Non-U.S. government-backed corporate | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember
Corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 1,610,442 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CorporateDebtSecuritiesMember | 1,803,415 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CorporateDebtSecuritiesMember
Corporate | Quoted Prices In Active Markets For Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CorporateDebtSecuritiesMember | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CorporateDebtSecuritiesMember
Corporate | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 1,594,782 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CorporateDebtSecuritiesMember | 1,775,835 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CorporateDebtSecuritiesMember
Corporate | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 15,660 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CorporateDebtSecuritiesMember | 27,580 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CorporateDebtSecuritiesMember
Agency mortgage-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 316,620 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 341,908 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Agency mortgage-backed | Quoted Prices In Active Markets For Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Agency mortgage-backed | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 316,620 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 341,908 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Agency mortgage-backed | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Non-agency mortgage-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 253,050 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember | 257,938 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Non-agency mortgage-backed | Quoted Prices In Active Markets For Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Non-agency mortgage-backed | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 253,050 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember | 257,938 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Non-agency mortgage-backed | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Commercial mortgage-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 381,051 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 314,236 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Commercial mortgage-backed | Quoted Prices In Active Markets For Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Commercial mortgage-backed | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 381,051 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 314,236 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Commercial mortgage-backed | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Asset-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 27,610 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_AssetBackedSecuritiesMember | 15,258 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_AssetBackedSecuritiesMember
Asset-backed | Quoted Prices In Active Markets For Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_AssetBackedSecuritiesMember | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_AssetBackedSecuritiesMember
Asset-backed | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 27,610 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_AssetBackedSecuritiesMember | 15,258 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_AssetBackedSecuritiesMember
Asset-backed | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_AssetBackedSecuritiesMember | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_AssetBackedSecuritiesMember
Private equity partnerships |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 281,932 us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PrivateEquityFundsMember | 322,391 us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PrivateEquityFundsMember
Private equity partnerships | Quoted Prices In Active Markets For Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 0 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PrivateEquityFundsMember | 0 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PrivateEquityFundsMember
Private equity partnerships | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 0 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PrivateEquityFundsMember | 0 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PrivateEquityFundsMember
Private equity partnerships | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 281,932 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PrivateEquityFundsMember | 322,391 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PrivateEquityFundsMember
Catastrophe bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 200,329 us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementBasisAxis = rnr_CatastropheBondsMember | 229,016 us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementBasisAxis = rnr_CatastropheBondsMember
Catastrophe bonds | Quoted Prices In Active Markets For Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 0 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_CatastropheBondsMember | 0 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_CatastropheBondsMember
Catastrophe bonds | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 200,329 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_CatastropheBondsMember | 229,016 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_CatastropheBondsMember
Catastrophe bonds | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 0 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_CatastropheBondsMember | 0 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_CatastropheBondsMember
Senior secured bank loan funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 19,316 us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementBasisAxis = rnr_SeniorSecuredBankLoanFundsMember | 18,048 us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementBasisAxis = rnr_SeniorSecuredBankLoanFundsMember
Senior secured bank loan funds | Quoted Prices In Active Markets For Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 0 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_SeniorSecuredBankLoanFundsMember | 0 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_SeniorSecuredBankLoanFundsMember
Senior secured bank loan funds | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 0 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_SeniorSecuredBankLoanFundsMember | 0 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_SeniorSecuredBankLoanFundsMember
Senior secured bank loan funds | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 19,316 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_SeniorSecuredBankLoanFundsMember | 18,048 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_SeniorSecuredBankLoanFundsMember
Hedge funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 2,570 us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_HedgeFundsMember | 3,809 us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_HedgeFundsMember
Hedge funds | Quoted Prices In Active Markets For Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 0 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_HedgeFundsMember | 0 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_HedgeFundsMember
Hedge funds | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 0 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_HedgeFundsMember | 0 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_HedgeFundsMember
Hedge funds | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 2,570 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_HedgeFundsMember | 3,809 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_HedgeFundsMember
Assumed and ceded reinsurance contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets and (liabilities) | (8,744)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByMeasurementBasisAxis = rnr_AssumedAndCededReInsuranceContractsMember |
Assumed and ceded reinsurance contracts | Quoted Prices In Active Markets For Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets and (liabilities) | 0 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_AssumedAndCededReInsuranceContractsMember |
Assumed and ceded reinsurance contracts | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets and (liabilities) | 0 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_AssumedAndCededReInsuranceContractsMember |
Derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets and (liabilities) | 6,345 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByMeasurementBasisAxis = rnr_DerivativesAssetsLiabilitiesMember | 4,758 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByMeasurementBasisAxis = rnr_DerivativesAssetsLiabilitiesMember
Derivatives | Quoted Prices In Active Markets For Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets and (liabilities) | (569)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_DerivativesAssetsLiabilitiesMember | 823 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_DerivativesAssetsLiabilitiesMember
Derivatives | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets and (liabilities) | 7,104 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_DerivativesAssetsLiabilitiesMember | 6,425 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_DerivativesAssetsLiabilitiesMember
Derivatives | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets and (liabilities) | (190)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_DerivativesAssetsLiabilitiesMember | (2,490)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_DerivativesAssetsLiabilitiesMember
Other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets and (liabilities) | (11,509)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByMeasurementBasisAxis = rnr_OtherItemsMember | (12,991)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByMeasurementBasisAxis = rnr_OtherItemsMember
Other | Quoted Prices In Active Markets For Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets and (liabilities) | 0 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_OtherItemsMember | 0 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_OtherItemsMember
Other | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets and (liabilities) | (11,509)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_OtherItemsMember | (12,991)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_OtherItemsMember
Other | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets and (liabilities) | $ 0 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_OtherItemsMember | $ 0 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementBasisAxis = rnr_OtherItemsMember

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