Statutory Requirements - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Statutory Accounting Practices [Line Items]
Assets held in trust	$ 7,900.0	$ 8,700.0
U.S.
Statutory Accounting Practices [Line Items]
Ordinary dividend capacity	108.7
New York \| Multi-Beneficiary Reinsurance Trust \| Renaissance Reinsurance Ltd.
Statutory Accounting Practices [Line Items]
Assets held in trust	600.0	1,200.0
New York \| Multi-Beneficiary Reinsurance Trust \| Renaissance Reinsurance Ltd. \| Low
Statutory Accounting Practices [Line Items]
Assets held in trust	511.4	531.8
New York \| Multi-Beneficiary Reinsurance Trust \| DaVinci Reinsurance Ltd.
Statutory Accounting Practices [Line Items]
Assets held in trust	255.6	272.0
New York \| Multi-Beneficiary Reinsurance Trust \| DaVinci Reinsurance Ltd. \| Low
Statutory Accounting Practices [Line Items]
Assets held in trust	200.1	182.3
New York \| Multi-Beneficiary Reduced Collateral Reinsurance Trust \| Renaissance Reinsurance Ltd.
Statutory Accounting Practices [Line Items]
Assets held in trust	172.7	136.3
New York \| Multi-Beneficiary Reduced Collateral Reinsurance Trust \| Renaissance Reinsurance Ltd. \| Low
Statutory Accounting Practices [Line Items]
Assets held in trust	146.1	128.1
New York \| Multi-Beneficiary Reduced Collateral Reinsurance Trust \| DaVinci Reinsurance Ltd.
Statutory Accounting Practices [Line Items]
Assets held in trust	211.0	168.1
New York \| Multi-Beneficiary Reduced Collateral Reinsurance Trust \| DaVinci Reinsurance Ltd. \| Low
Statutory Accounting Practices [Line Items]
Assets held in trust	174.7	164.5
New York \| Multi-Beneficiary Reduced Collateral Reinsurance Trust \| RenaissanceRe Europe
Statutory Accounting Practices [Line Items]
Assets held in trust	106.5	86.6
New York \| Multi-Beneficiary Reduced Collateral Reinsurance Trust \| RenaissanceRe Europe \| Low
Statutory Accounting Practices [Line Items]
Assets held in trust	$ 98.3	$ 75.8
Florida \| Multi-Beneficiary Reduced Collateral Reinsurance Trust \| Renaissance Reinsurance Ltd.
Statutory Accounting Practices [Line Items]
Multi-beneficiary reduced collateral reinsurance trust collateral reduction	20.00%
Florida \| Multi-Beneficiary Reduced Collateral Reinsurance Trust \| DaVinci Reinsurance Ltd.
Statutory Accounting Practices [Line Items]
Multi-beneficiary reduced collateral reinsurance trust collateral reduction	50.00%
Florida \| Multi-Beneficiary Reduced Collateral Reinsurance Trust \| RenaissanceRe Europe
Statutory Accounting Practices [Line Items]
Multi-beneficiary reduced collateral reinsurance trust collateral reduction	20.00%

Reduction in collateral requirements of multi-beneficiary reinsurance trust to the percentage noted of the net outstanding insurance liabilities.

No definition available.

+ Details

Name:	rnr_MultiBeneficiaryReducedCollateralReinsuranceTrustCollateralReduction
Namespace Prefix:	rnr_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(b))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

+ Details

Name:	us-gaap_AssetsHeldInTrust
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_StatutoryAccountingPracticesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of dividends that can be declared or paid without approval of regulatory agency.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_StatutoryAccountingPracticesByJurisdictionAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatutoryAccountingPracticesByJurisdictionAxis=stpr_NY
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	rnr_ReinsuranceTrustFundAxis=rnr_MultiBeneficiaryReinsuranceTrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	rnr_ReinsuranceTrustFundAxis=rnr_MultiBeneficiaryReducedCollateralReinsuranceTrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=rnr_RenaissanceReEuropeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatutoryAccountingPracticesByJurisdictionAxis=stpr_FL
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: