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Organization (Details) (RenaissanceRe Upsilon Fund Ltd, Variable Interest Entity, Not Primary Beneficiary)	0 Months Ended
	Nov. 13, 2014
RenaissanceRe Upsilon Fund Ltd | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Percent of segregated funds owned by third party investors	100.00%rnr_VariableInterestEntityNonredeemableNonvotingSharesSegregatedFundsOwnedbyThirdParties / dei_LegalEntityAxis = rnr_RenaissanceReUpsilonFundLtdMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember

X

- Definition

Variable Interest Entity, Nonredeemable Nonvoting Shares, Segregated Funds, Owned by Third Parties

+ References

No definition available.

+ Details

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Namespace Prefix:	rnr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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