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Segment Reporting (Schedule Of Gross Premiums Written Allocated To the Territory Of Coverage Exposure) (Details) (USD $) In Thousands, unless otherwise specified	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
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written	$ 132,780us-gaap_PremiumsWrittenGross	$ 200,992us-gaap_PremiumsWrittenGross	$ 511,540us-gaap_PremiumsWrittenGross	$ 705,260us-gaap_PremiumsWrittenGross	$ 84,122us-gaap_PremiumsWrittenGross	$ 182,649us-gaap_PremiumsWrittenGross	$ 703,223us-gaap_PremiumsWrittenGross	$ 635,418us-gaap_PremiumsWrittenGross	$ 1,550,572us-gaap_PremiumsWrittenGross	$ 1,605,412us-gaap_PremiumsWrittenGross	$ 1,551,591us-gaap_PremiumsWrittenGross
Catastrophe Reinsurance
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written									933,969us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	1,120,379us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember	1,182,207us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember
Catastrophe Reinsurance | U.S. and Caribbean
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written									573,696us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_U.S.andCaribbeanMember	782,211us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_U.S.andCaribbeanMember	857,740us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_U.S.andCaribbeanMember
Catastrophe Reinsurance | Worldwide
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written									157,674us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_WorldwideMember	99,179us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_WorldwideMember	81,595us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_WorldwideMember
Catastrophe Reinsurance | Worldwide (excluding U.S.)
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written									123,476us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_WorldwideExcludingU.S.Member	146,048us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_WorldwideExcludingU.S.Member	139,265us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_WorldwideExcludingU.S.Member
Catastrophe Reinsurance | Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written									31,484us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = country_JP	39,060us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = country_JP	43,238us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = country_JP
Catastrophe Reinsurance | Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written									25,353us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	25,659us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	37,113us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
Catastrophe Reinsurance | Australia and New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written									20,807us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_AustraliaandNewZealandMember	22,460us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_AustraliaandNewZealandMember	18,578us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_AustraliaandNewZealandMember
Catastrophe Reinsurance | Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written									1,479us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_OtherGeographicalLocationsMember	5,762us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_OtherGeographicalLocationsMember	4,678us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_OtherGeographicalLocationsMember
Specialty Reinsurance
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written									346,638us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	259,489us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember	209,887us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember
Specialty Reinsurance | U.S. and Caribbean
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written									169,045us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_U.S.andCaribbeanMember	91,203us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_U.S.andCaribbeanMember	69,070us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_U.S.andCaribbeanMember
Specialty Reinsurance | Worldwide
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written									161,329us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_WorldwideMember	151,879us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_WorldwideMember	96,081us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_WorldwideMember
Specialty Reinsurance | Worldwide (excluding U.S.)
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written									7,506us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_WorldwideExcludingU.S.Member	1,661us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_WorldwideExcludingU.S.Member	0us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_WorldwideExcludingU.S.Member
Specialty Reinsurance | Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written									460us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	2,612us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	16,429us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
Specialty Reinsurance | Australia and New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written									6,898us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_AustraliaandNewZealandMember	12,068us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_AustraliaandNewZealandMember	28,307us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_AustraliaandNewZealandMember
Specialty Reinsurance | Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written									1,400us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_OtherGeographicalLocationsMember	66us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_OtherGeographicalLocationsMember	0us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember / us-gaap_StatementGeographicalAxis = rnr_OtherGeographicalLocationsMember
Lloyd's
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written									269,656us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	226,532us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember	159,987us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember
Lloyd's | U.S. and Caribbean
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written									120,066us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember / us-gaap_StatementGeographicalAxis = rnr_U.S.andCaribbeanMember	88,535us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember / us-gaap_StatementGeographicalAxis = rnr_U.S.andCaribbeanMember	57,332us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember / us-gaap_StatementGeographicalAxis = rnr_U.S.andCaribbeanMember
Lloyd's | Worldwide
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written									118,190us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember / us-gaap_StatementGeographicalAxis = rnr_WorldwideMember	104,249us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember / us-gaap_StatementGeographicalAxis = rnr_WorldwideMember	75,132us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember / us-gaap_StatementGeographicalAxis = rnr_WorldwideMember
Lloyd's | Worldwide (excluding U.S.)
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written									13,655us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember / us-gaap_StatementGeographicalAxis = rnr_WorldwideExcludingU.S.Member	8,071us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember / us-gaap_StatementGeographicalAxis = rnr_WorldwideExcludingU.S.Member	6,064us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember / us-gaap_StatementGeographicalAxis = rnr_WorldwideExcludingU.S.Member
Lloyd's | Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written									7,609us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	14,763us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	14,456us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
Lloyd's | Australia and New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written									2,907us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember / us-gaap_StatementGeographicalAxis = rnr_AustraliaandNewZealandMember	2,948us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember / us-gaap_StatementGeographicalAxis = rnr_AustraliaandNewZealandMember	2,152us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember / us-gaap_StatementGeographicalAxis = rnr_AustraliaandNewZealandMember
Lloyd's | Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written									7,229us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember / us-gaap_StatementGeographicalAxis = rnr_OtherGeographicalLocationsMember	7,966us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember / us-gaap_StatementGeographicalAxis = rnr_OtherGeographicalLocationsMember	4,851us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember / us-gaap_StatementGeographicalAxis = rnr_OtherGeographicalLocationsMember
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written									309us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	(988)us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	(490)us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Intersegment Eliminations
Revenues from External Customers and Long-Lived Assets [Line Items]
Gross premiums written									$ 300us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember	$ (1,000)us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember	$ (500)us-gaap_PremiumsWrittenGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_IntersegmentEliminationMember

X

- Definition

Amount of direct and assumed premiums written.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 605

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

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