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Investments (Schedule of Equity In (Losses) Earnings Of Other Ventures, Under Equity Method) (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of other ventures | $ 4,838,000 us-gaap_IncomeLossFromEquityMethodInvestments | $ 9,806,000 us-gaap_IncomeLossFromEquityMethodInvestments | $ 7,232,000 us-gaap_IncomeLossFromEquityMethodInvestments | $ 4,199,000 us-gaap_IncomeLossFromEquityMethodInvestments | $ 6,274,000 us-gaap_IncomeLossFromEquityMethodInvestments | $ 7,313,000 us-gaap_IncomeLossFromEquityMethodInvestments | $ 3,772,000 us-gaap_IncomeLossFromEquityMethodInvestments | $ 5,835,000 us-gaap_IncomeLossFromEquityMethodInvestments | $ 26,075,000 us-gaap_IncomeLossFromEquityMethodInvestments | $ 23,194,000 us-gaap_IncomeLossFromEquityMethodInvestments | $ 23,238,000 us-gaap_IncomeLossFromEquityMethodInvestments
Undistributed earnings (losses) from equity method investments | 20,000,000 us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees |  |  |  | 15,500,000 us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees |  |  |  | 20,000,000 us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees | 15,500,000 us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees |
Equity method investment, dividends or distributions |  |  |  |  |  |  |  |  | 10,300,000 us-gaap_EquityMethodInvestmentDividendsOrDistributions | 9,900,000 us-gaap_EquityMethodInvestmentDividendsOrDistributions | 9,900,000 us-gaap_EquityMethodInvestmentDividendsOrDistributions
Tower Hill Companies |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of other ventures |  |  |  |  |  |  |  |  | 18,376,000 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rnr_TowerHillCompaniesMember | 10,270,000 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rnr_TowerHillCompaniesMember | 4,965,000 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rnr_TowerHillCompaniesMember
Top Layer Re |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of other ventures |  |  |  |  |  |  |  |  | 10,411,000 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rnr_TopLayerReMember | 13,836,000 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rnr_TopLayerReMember | 20,792,000 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rnr_TopLayerReMember
Angus |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of other ventures |  |  |  |  |  |  |  |  | (1,402,000)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rnr_AngusMember | (858,000)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rnr_AngusMember | (2,519,000)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rnr_AngusMember
Other |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of other ventures |  |  |  |  |  |  |  |  | $ (1,310,000)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rnr_EquityMethodInvesteeOtherMember | $ (54,000)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rnr_EquityMethodInvesteeOtherMember | $ 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rnr_EquityMethodInvesteeOtherMember

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