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Debt and Credit Facilities Debt and Credit Facilities (Summary of Debt Obligations) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Debt	$ 826,774us-gaap_LongTermDebt	$ 249,522us-gaap_LongTermDebt
RenRe North America Holdings Inc.
Debt Instrument [Line Items]
Long-term Debt, Fair Value	863,566us-gaap_LongTermDebtFairValue / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	279,000us-gaap_LongTermDebtFairValue / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
RenRe North America Holdings Inc. | 5.75% Senior Notes Due March 15, 2020
Debt Instrument [Line Items]
Long-term Debt, Fair Value	285,000us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = rnr_A5.75SeniorNotesDueMarch152020Member / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	279,000us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = rnr_A5.75SeniorNotesDueMarch152020Member / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Debt	249,545us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = rnr_A5.75SeniorNotesDueMarch152020Member / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	249,522us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = rnr_A5.75SeniorNotesDueMarch152020Member / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
RenRe North America Holdings Inc. | 3.700% Senior Notes Due April 1, 2025
Debt Instrument [Line Items]
Long-term Debt, Fair Value	300,450us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = rnr_A3.700SeniorNotesDueApril12025Member / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	0us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = rnr_A3.700SeniorNotesDueApril12025Member / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Debt	299,400us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = rnr_A3.700SeniorNotesDueApril12025Member / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	0us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = rnr_A3.700SeniorNotesDueApril12025Member / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
RenRe North America Holdings Inc. | Series B 7.50% Notes Due June 1, 2017
Debt Instrument [Line Items]
Long-term Debt, Fair Value	278,116us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = rnr_SeriesB7.50NotesDueJune12017Member / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	0us-gaap_LongTermDebtFairValue / us-gaap_DebtInstrumentAxis = rnr_SeriesB7.50NotesDueJune12017Member / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Debt	$ 277,829us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = rnr_SeriesB7.50NotesDueJune12017Member / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	$ 0us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = rnr_SeriesB7.50NotesDueJune12017Member / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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-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 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

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Reference 6: 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

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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