Debt Instrument, Number of Facilities

No definition available.

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Namespace Prefix:	rnr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Maximum Increases In Or Issuances Of Borrowing Capacity

+ References

No definition available.

+ Details

Name:	rnr_LineofCreditFacilityMaximumIncreasesInOrIssuancesOfBorrowingCapacity
Namespace Prefix:	rnr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: 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=64930785&loc=d3e28551-108399

+ Details

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

- Definition

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

+ References

Reference 1: 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(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=rnr_A3.450SeniorNotesDueJuly12027Member
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- Details

Name:	dei_LegalEntityAxis=rnr_RenaissanceReFinanceInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
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Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_DebtInstrumentAxis=rnr_SeriesB7.50NotesDueJune12017Member
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	dei_LegalEntityAxis=rnr_PlatinumUnderwritersFinanceIncMember
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Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_DebtInstrumentAxis=rnr_RenaissanceReinsuranceFALFacilityMember
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Data Type:	na
Balance Type:
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- Details

Name:	dei_LegalEntityAxis=rnr_Syndicate1458Member
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Data Type:	na
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- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
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Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_LineOfCreditFacilityAxis=rnr_BankOfMontrealCitibankEuropePlcANDINGBankN.V.Member
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Data Type:	na
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- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=rnr_LineOfCreditTwoMember
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Debt and Credit Facilities (Narrative) (Details)	May 24, 2017 USD ($) letter_of_credit	Sep. 30, 2017	Jun. 29, 2017 USD ($)	Jun. 01, 2017 USD ($)	May 25, 2017 USD ($)	May 25, 2017 GBP (£)	Dec. 31, 2016
3.450% Senior Notes due 2027
Debt Instrument [Line Items]
Senior notes interest rate		3.45%
3.450% Senior Notes due 2027 \| RenaissanceRe Finance, Inc. \| Senior Notes
Debt Instrument [Line Items]
Senior notes interest rate			3.45%
Debt instrument, Face amount			$ 300,000,000
Series B 7.50% Senior Notes due 2017
Debt Instrument [Line Items]
Senior notes interest rate							7.50%
Series B 7.50% Senior Notes due 2017 \| Platinum Underwriters Finance, Inc \| Senior Notes
Debt Instrument [Line Items]
Senior notes interest rate				7.50%
Debt instrument, Face amount				$ 250,000,000
Renaissance Reinsurance FAL Facility \| Syndicate 1458 \| Line of Credit \| Bank Of Montreal, Citibank Europe and ING Bank
Debt Instrument [Line Items]
Number of letters of credit \| letter_of_credit	2
Maximum increases in or issuances of borrowing capacity					$ 75,000,000
Renaissance Reinsurance FAL Facility \| Syndicate 1458 \| Line of Credit \| Bank Of Montreal, Citibank Europe and ING Bank \| Line of Credit
Debt Instrument [Line Items]
Letter of credit aggregate commitment	$ 380,000,000				$ 180,000,000
Renaissance Reinsurance FAL Facility \| Syndicate 1458 \| Line of Credit \| Bank Of Montreal, Citibank Europe and ING Bank \| Line Of Credit Two
Debt Instrument [Line Items]
Letter of credit aggregate commitment \| £						£ 90,000,000