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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 | Mar. 31, 2015 | Dec. 31, 2014
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | $ 6,007,929 us-gaap_MarketableSecuritiesFixedMaturities | $ 4,783,570 us-gaap_MarketableSecuritiesFixedMaturities
Short term investments | 1,775,819 us-gaap_OtherShortTermInvestments | 1,013,222 us-gaap_OtherShortTermInvestments
Equity investments trading | 261,656 us-gaap_TradingSecuritiesEquity | 322,098 us-gaap_TradingSecuritiesEquity
Other investments | 514,906 us-gaap_OtherInvestments | 504,147 us-gaap_OtherInvestments
Other assets and (liabilities) | 78,822 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis | (13,908)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis
Total assets and liabilities measured on recurring basis | 8,639,132 rnr_TotalAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasis | 6,609,129 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 | 1,535,746 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 1,671,471 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 | 261,656 us-gaap_TradingSecuritiesEquity / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 322,098 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
Other assets and (liabilities) | (492)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | (569)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Total assets and liabilities measured on recurring basis | 1,796,910 rnr_TotalAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 1,993,000 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 | 4,456,709 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 3,096,439 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Short term investments | 1,775,819 us-gaap_OtherShortTermInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 1,013,222 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 | 221,780 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 200,329 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Other assets and (liabilities) | 6,345 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | (4,405)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Total assets and liabilities measured on recurring basis | 6,460,653 rnr_TotalAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 4,305,585 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 | 15,474 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 15,660 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 | 293,126 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 303,818 us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Other assets and (liabilities) | 72,969 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | (8,934)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Total assets and liabilities measured on recurring basis | 381,569 rnr_TotalAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 310,544 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 | 1,535,746 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_USTreasurySecuritiesMember | 1,671,471 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = 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 | 1,535,746 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_USTreasurySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 1,671,471 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_USTreasurySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
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_FairValueByAssetClassAxis = us-gaap_USTreasurySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_USTreasurySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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_FairValueByAssetClassAxis = us-gaap_USTreasurySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_USTreasurySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 152,272 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_AgencySecuritiesMember | 96,208 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = 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_FairValueByAssetClassAxis = us-gaap_AgencySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_AgencySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Agencies | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 152,272 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_AgencySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 96,208 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_AgencySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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_FairValueByAssetClassAxis = us-gaap_AgencySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_AgencySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Municipals |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 1,220,206 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |
Municipals | 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_FairValueByAssetClassAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
Municipals | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 1,220,206 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Municipals | 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_FairValueByAssetClassAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Non-U.S. government (Sovereign Debt) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 329,626 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember | 280,651 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = 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_FairValueByAssetClassAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
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 | 329,626 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 280,651 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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_FairValueByAssetClassAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Non-U.S. government-backed corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 151,446 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember | 146,467 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = 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_FairValueByAssetClassAxis = rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
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 | 151,446 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 146,467 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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_FairValueByAssetClassAxis = rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 1,603,024 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember | 1,610,442 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = 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_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Corporate | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 1,587,550 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 1,594,782 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Corporate | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 15,474 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 15,660 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Agency mortgage-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 342,461 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 316,620 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = 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_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
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 | 342,461 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 316,620 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Non-agency mortgage-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 268,102 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember | 253,050 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = 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_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
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 | 268,102 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 253,050 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Commercial mortgage-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 361,812 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 381,051 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = 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_FairValueByAssetClassAxis = us-gaap_CommercialMortgageBackedSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialMortgageBackedSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
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 | 361,812 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialMortgageBackedSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 381,051 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialMortgageBackedSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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_FairValueByAssetClassAxis = us-gaap_CommercialMortgageBackedSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialMortgageBackedSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Asset-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 43,234 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetBackedSecuritiesMember | 27,610 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = 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_FairValueByAssetClassAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Asset-backed | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments | 43,234 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 27,610 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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_FairValueByAssetClassAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_MarketableSecuritiesFixedMaturities / us-gaap_FairValueByAssetClassAxis = us-gaap_AssetBackedSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Private equity partnerships |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 271,074 us-gaap_OtherInvestments / us-gaap_FairValueByAssetClassAxis = us-gaap_PrivateEquityFundsMember | 281,932 us-gaap_OtherInvestments / us-gaap_FairValueByAssetClassAxis = 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_FairValueByAssetClassAxis = us-gaap_PrivateEquityFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_OtherInvestments / us-gaap_FairValueByAssetClassAxis = us-gaap_PrivateEquityFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
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_FairValueByAssetClassAxis = us-gaap_PrivateEquityFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 us-gaap_OtherInvestments / us-gaap_FairValueByAssetClassAxis = us-gaap_PrivateEquityFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Private equity partnerships | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 271,074 us-gaap_OtherInvestments / us-gaap_FairValueByAssetClassAxis = us-gaap_PrivateEquityFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 281,932 us-gaap_OtherInvestments / us-gaap_FairValueByAssetClassAxis = us-gaap_PrivateEquityFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Catastrophe bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 221,780 us-gaap_OtherInvestments / us-gaap_FairValueByAssetClassAxis = rnr_CatastropheBondsMember | 200,329 us-gaap_OtherInvestments / us-gaap_FairValueByAssetClassAxis = 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_FairValueByAssetClassAxis = rnr_CatastropheBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_OtherInvestments / us-gaap_FairValueByAssetClassAxis = rnr_CatastropheBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Catastrophe bonds | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 221,780 us-gaap_OtherInvestments / us-gaap_FairValueByAssetClassAxis = rnr_CatastropheBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 200,329 us-gaap_OtherInvestments / us-gaap_FairValueByAssetClassAxis = rnr_CatastropheBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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_FairValueByAssetClassAxis = rnr_CatastropheBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_OtherInvestments / us-gaap_FairValueByAssetClassAxis = rnr_CatastropheBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Senior secured bank loan funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 19,679 us-gaap_OtherInvestments / us-gaap_FairValueByAssetClassAxis = rnr_SeniorSecuredBankLoanFundsMember | 19,316 us-gaap_OtherInvestments / us-gaap_FairValueByAssetClassAxis = 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_FairValueByAssetClassAxis = rnr_SeniorSecuredBankLoanFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_OtherInvestments / us-gaap_FairValueByAssetClassAxis = rnr_SeniorSecuredBankLoanFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
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_FairValueByAssetClassAxis = rnr_SeniorSecuredBankLoanFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 us-gaap_OtherInvestments / us-gaap_FairValueByAssetClassAxis = rnr_SeniorSecuredBankLoanFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
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 | 19,679 us-gaap_OtherInvestments / us-gaap_FairValueByAssetClassAxis = rnr_SeniorSecuredBankLoanFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 19,316 us-gaap_OtherInvestments / us-gaap_FairValueByAssetClassAxis = rnr_SeniorSecuredBankLoanFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Hedge funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 2,373 us-gaap_OtherInvestments / us-gaap_FairValueByAssetClassAxis = us-gaap_HedgeFundsMember | 2,570 us-gaap_OtherInvestments / us-gaap_FairValueByAssetClassAxis = 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_FairValueByAssetClassAxis = us-gaap_HedgeFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_OtherInvestments / us-gaap_FairValueByAssetClassAxis = us-gaap_HedgeFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
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_FairValueByAssetClassAxis = us-gaap_HedgeFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 us-gaap_OtherInvestments / us-gaap_FairValueByAssetClassAxis = us-gaap_HedgeFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Hedge funds | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 2,373 us-gaap_OtherInvestments / us-gaap_FairValueByAssetClassAxis = us-gaap_HedgeFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 2,570 us-gaap_OtherInvestments / us-gaap_FairValueByAssetClassAxis = us-gaap_HedgeFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Assumed and ceded (re)insurance contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets and (liabilities) | 72,993 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByAssetClassAxis = rnr_AssumedAndCededReInsuranceContractsMember | (8,744)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByAssetClassAxis = rnr_AssumedAndCededReInsuranceContractsMember
Assumed and ceded (re)insurance contracts | Quoted Prices In Active Markets For Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets and (liabilities) | 0 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByAssetClassAxis = rnr_AssumedAndCededReInsuranceContractsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByAssetClassAxis = rnr_AssumedAndCededReInsuranceContractsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Assumed and ceded (re)insurance contracts | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets and (liabilities) | 0 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByAssetClassAxis = rnr_AssumedAndCededReInsuranceContractsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByAssetClassAxis = rnr_AssumedAndCededReInsuranceContractsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Assumed and ceded (re)insurance contracts | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets and (liabilities) | 72,993 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByAssetClassAxis = rnr_AssumedAndCededReInsuranceContractsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | (8,744)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByAssetClassAxis = rnr_AssumedAndCededReInsuranceContractsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets and (liabilities) | 7,376 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByAssetClassAxis = rnr_DerivativesAssetsLiabilitiesMember | 6,345 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByAssetClassAxis = 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] |  |
Other assets and (liabilities) | (492)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByAssetClassAxis = rnr_DerivativesAssetsLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | (569)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByAssetClassAxis = rnr_DerivativesAssetsLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Derivatives | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets and (liabilities) | 7,892 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByAssetClassAxis = rnr_DerivativesAssetsLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 7,104 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByAssetClassAxis = rnr_DerivativesAssetsLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Derivatives | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets and (liabilities) | (24)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByAssetClassAxis = rnr_DerivativesAssetsLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | (190)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByAssetClassAxis = rnr_DerivativesAssetsLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets and (liabilities) | (1,547)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByAssetClassAxis = rnr_OtherItemsMember | (11,509)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByAssetClassAxis = 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] |  |
Other assets and (liabilities) | 0 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByAssetClassAxis = rnr_OtherItemsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByAssetClassAxis = rnr_OtherItemsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Other | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets and (liabilities) | (1,547)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByAssetClassAxis = rnr_OtherItemsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | (11,509)rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByAssetClassAxis = rnr_OtherItemsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Other | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other assets and (liabilities) | $ 0 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByAssetClassAxis = rnr_OtherItemsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | $ 0 rnr_OtherAssetsAndliabilitiesMeasuredonRecurringBasis / us-gaap_FairValueByAssetClassAxis = rnr_OtherItemsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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- Definition This element represents the aggregate of the assets and liabilities reported on the balance sheet at period end measured at fair value 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
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- Definition For an unclassified balance sheet, this item represents investments in debt securities having predetermined or determinable maturity dates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Other investments not otherwise specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 12 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f,g)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Other investments not otherwise specified in the taxonomy that will be realized in a short period of time, usually less than one year or the normal operating cycle, whichever is longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.5) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(g)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
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