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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. 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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- 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.

+ Details

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

- Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=rnr_A3.700SeniorNotesDueApril12025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=rnr_A4.750SeniorNotesDueMay12025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rnr_A3.600SeniorNotesDue2029Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rnr_A3.450SeniorNotesDueJuly12027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rnr_A5.75SeniorNotesDueMarch152020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt and Credit Facilities (Schedule of Carrying Values and Estimated Fair Values of Debt Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Apr. 02, 2019	Dec. 31, 2018	Jun. 29, 2017	May 04, 2015	Mar. 24, 2015
Debt Instrument [Line Items]
Fair Value	$ 1,468,618		$ 974,714
Carrying Value	$ 1,384,105		991,127
RenaissanceRe Finance, Inc. \| 3.700% Senior Notes due 2025
Debt Instrument [Line Items]
Interest rate						3.70%
DaVinciRe Holdings Ltd. \| 4.750% Senior Notes due 2025 (DaVinciRe)
Debt Instrument [Line Items]
Interest rate					4.75%
Senior Notes \| 3.600% Senior Notes due 2029
Debt Instrument [Line Items]
Interest rate	3.60%	3.60%
Senior Notes \| 3.450% Senior Notes due 2027
Debt Instrument [Line Items]
Interest rate	3.45%
Senior Notes \| 3.700% Senior Notes due 2025
Debt Instrument [Line Items]
Interest rate	3.70%
Senior Notes \| 5.750% Senior Notes due 2020
Debt Instrument [Line Items]
Interest rate	5.75%
Senior Notes \| 4.750% Senior Notes due 2025 (DaVinciRe)
Debt Instrument [Line Items]
Interest rate	4.75%
Senior Notes \| RenaissanceRe Finance, Inc. \| 3.600% Senior Notes due 2029
Debt Instrument [Line Items]
Fair Value	$ 424,920		0
Carrying Value	391,475		0
Senior Notes \| RenaissanceRe Finance, Inc. \| 3.450% Senior Notes due 2027
Debt Instrument [Line Items]
Interest rate				3.45%
Fair Value	314,070		283,680
Carrying Value	296,292		295,797
Senior Notes \| RenaissanceRe Finance, Inc. \| 3.700% Senior Notes due 2025
Debt Instrument [Line Items]
Fair Value	318,567		292,557
Carrying Value	298,057		297,688
Senior Notes \| RenaissanceRe Finance, Inc. \| 5.750% Senior Notes due 2020
Debt Instrument [Line Items]
Fair Value	251,030		255,938
Carrying Value	249,931		249,602
Senior Notes \| DaVinciRe Holdings Ltd. \| 4.750% Senior Notes due 2025 (DaVinciRe)
Debt Instrument [Line Items]
Fair Value	160,031		142,539
Carrying Value	$ 148,350		$ 148,040