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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
	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	$ 4,838,000us-gaap_IncomeLossFromEquityMethodInvestments	$ 9,806,000us-gaap_IncomeLossFromEquityMethodInvestments	$ 7,232,000us-gaap_IncomeLossFromEquityMethodInvestments	$ 4,199,000us-gaap_IncomeLossFromEquityMethodInvestments	$ 6,274,000us-gaap_IncomeLossFromEquityMethodInvestments	$ 7,313,000us-gaap_IncomeLossFromEquityMethodInvestments	$ 3,772,000us-gaap_IncomeLossFromEquityMethodInvestments	$ 5,835,000us-gaap_IncomeLossFromEquityMethodInvestments	$ 26,075,000us-gaap_IncomeLossFromEquityMethodInvestments	$ 23,194,000us-gaap_IncomeLossFromEquityMethodInvestments	$ 23,238,000us-gaap_IncomeLossFromEquityMethodInvestments
Undistributed earnings (losses) from equity method investments	20,000,000us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees				15,500,000us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees				20,000,000us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees	15,500,000us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees
Equity method investment, dividends or distributions									10,300,000us-gaap_EquityMethodInvestmentDividendsOrDistributions	9,900,000us-gaap_EquityMethodInvestmentDividendsOrDistributions	9,900,000us-gaap_EquityMethodInvestmentDividendsOrDistributions
Tower Hill Companies
Schedule of Equity Method Investments [Line Items]
Equity in earnings of other ventures									18,376,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rnr_TowerHillCompaniesMember	10,270,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rnr_TowerHillCompaniesMember	4,965,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rnr_TowerHillCompaniesMember
Top Layer Re
Schedule of Equity Method Investments [Line Items]
Equity in earnings of other ventures									10,411,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rnr_TopLayerReMember	13,836,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rnr_TopLayerReMember	20,792,000us-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	$ 0us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rnr_EquityMethodInvesteeOtherMember

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- Definition

This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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