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Debt and Credit Facilities Debt and Credit Facilities (Credit Facilities) (Details) In Thousands, unless otherwise specified	Mar. 31, 2015 USD ($)	Mar. 31, 2015 GBP (£)	Mar. 31, 2015 Standby Letter of Credit Facility USD ($)	Mar. 31, 2015 Renaissance Reinsurance, DaVinci, RenaissanceRe Specialty Risks, ROE and RenaissanceRe Specialty U.S. Letter of Credit Bilateral Facility USD ($)	Mar. 31, 2015 Citibank Europe PLC Syndicate 1458 Letter of Credit USD ($)	Mar. 31, 2015 Citibank Europe PLC Syndicate 1458 Letter of Credit GBP (£)	Mar. 31, 2015 Citibank Europe PLC RenaissanceRe Specialty Risks Letter of Credit USD ($)	Mar. 31, 2015 Revolving Credit Facility USD ($)
Debt Instrument [Line Items]
Letters of credit outstanding			$ 73,584us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = us-gaap_StandbyLettersOfCreditMember	$ 139,463us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = rnr_BilateralFacilityMember / dei_LegalEntityAxis = rnr_RenaissanceReinsuranceDaVinciRenaissanceReSpecialtyRisksROEandRenaissanceReSpecialtyU.S.Member / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember			$ 8,609us-gaap_LettersOfCreditOutstandingAmount / dei_LegalEntityAxis = rnr_RenaissanceReSpecialtyRisksMember / us-gaap_LineOfCreditFacilityAxis = rnr_CitibankEuropePlcMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember
Long-term Line of Credit	$ 617,420us-gaap_LineOfCredit	£ 70,000us-gaap_LineOfCredit			$ 300,000us-gaap_LineOfCredit / dei_LegalEntityAxis = rnr_Syndicate1458Member / us-gaap_LineOfCreditFacilityAxis = rnr_CitibankEuropePlcMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember	£ 70,000us-gaap_LineOfCredit / dei_LegalEntityAxis = rnr_Syndicate1458Member / us-gaap_LineOfCreditFacilityAxis = rnr_CitibankEuropePlcMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LetterOfCreditMember		$ 0us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5



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 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant