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Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Narrative) (Details) (RenRe North America Holdings Inc. (Subsidiary Issuer), 5.75% Senior Notes Due March 15, 2020, USD $)	0 Months Ended
	Mar. 17, 2010
RenRe North America Holdings Inc. (Subsidiary Issuer) | 5.75% Senior Notes Due March 15, 2020
Debt Instrument [Line Items]
Senior notes issuance date	Mar. 17, 2010
5.75% Senior Notes Due March 15, 2020	$ 250,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = rnr_FivePointSevenFivePercentageSeniorNotesDueMarchFifteenTwoThousandAndTwentyMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Senior notes interest rate	5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = rnr_FivePointSevenFivePercentageSeniorNotesDueMarchFifteenTwoThousandAndTwentyMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Senior notes maturity date	March 15, 2020

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

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-Section 55

-Paragraph 8

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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- Definition

Date the debt instrument was issued, in CCYY-MM-DD format.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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

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-Name Accounting Standards Codification

-Topic 210

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-Section S99

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