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Noncontrolling Interests (Narrative) (Details) (USD $)	3 Months Ended		1 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Jan. 31, 2015	Jan. 31, 2014	Dec. 31, 2014	Jan. 01, 2015	Jul. 01, 2014	Jun. 30, 2014	Jan. 01, 2014
DaVinciRe
Redeemable Noncontrolling Interest [Line Items]
Parent company ownership in redeemable noncontrolling interest	26.30%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rnr_DavincireMember				23.40%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rnr_DavincireMember	26.30%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rnr_DavincireMember	23.40%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rnr_DavincireMember	26.50%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rnr_DavincireMember	26.50%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rnr_DavincireMember
Redemption of shares from redeemable noncontrolling interest	$ 207,898,000us-gaap_MinorityInterestDecreaseFromRedemptions / dei_LegalEntityAxis = rnr_DavincireMember	$ 218,879,000us-gaap_MinorityInterestDecreaseFromRedemptions / dei_LegalEntityAxis = rnr_DavincireMember
DaVinciRe | Redeemable Noncontrolling Interest
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interest, net redemptions			225,000,000us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesNet / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_StatementEquityComponentsAxis = rnr_RedeemableNoncontrollingInterestMember	300,000,000us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesNet / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_StatementEquityComponentsAxis = rnr_RedeemableNoncontrollingInterestMember
Redeemable noncontrolling interest, reserve holdback			22,500,000rnr_RedeemableNoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterestsReserveHoldback / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_StatementEquityComponentsAxis = rnr_RedeemableNoncontrollingInterestMember	30,000,000rnr_RedeemableNoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterestsReserveHoldback / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_StatementEquityComponentsAxis = rnr_RedeemableNoncontrollingInterestMember
Proceeds from sale of partial interest in consolidated subsidiary							38,900,000rnr_ProceedsFromDivestitureOfPartialInterestInConsolidatedSubsidiaries / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_StatementEquityComponentsAxis = rnr_RedeemableNoncontrollingInterestMember
DaVinciRe | Redeemable Noncontrolling Interest | Maximum
Redeemable Noncontrolling Interest [Line Items]
Share repurchase requests, limit	25.00%rnr_MinorityInterestAggregateShareRepurchaseRequestLimitAsPercentOfCapital / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementEquityComponentsAxis = rnr_RedeemableNoncontrollingInterestMember
Medici
Redeemable Noncontrolling Interest [Line Items]
Parent company ownership in redeemable noncontrolling interest	48.60%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rnr_MediciMember				53.20%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rnr_MediciMember
Redemption provision, notice period	30 days
Subscription from redeemable noncontrolling interest	19,600,000us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance / dei_LegalEntityAxis = rnr_MediciMember				57,300,000us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance / dei_LegalEntityAxis = rnr_MediciMember
Redemption of shares from redeemable noncontrolling interest	$ 14,684,000us-gaap_MinorityInterestDecreaseFromRedemptions / dei_LegalEntityAxis = rnr_MediciMember	$ 1,875,000us-gaap_MinorityInterestDecreaseFromRedemptions / dei_LegalEntityAxis = rnr_MediciMember			$ 3,100,000us-gaap_MinorityInterestDecreaseFromRedemptions / dei_LegalEntityAxis = rnr_MediciMember

X

- Definition

This item limits the aggregate of all share repurchase requests to 25% of DaVinciRe's capital in any given year and satisfying all applicable regulatory requirements. If total shareholder requests exceed 25% of DaVinciRe's capital, the number of shares repurchased will be reduced among the requesting shareholders pro-rata, based on the amounts desired to be repurchased.

+ References

No definition available.

+ Details

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Namespace Prefix:	rnr_
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Balance Type:	na
Period Type:	instant

X

- Definition

Noncontrolling Interest, Redemption Provision, Notice Period

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
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X

- Definition

Proceeds from Divestiture of Partial Interest in Consolidated Subsidiaries

+ References

No definition available.

+ Details

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Namespace Prefix:	rnr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Reserve holdback.

+ References

No definition available.

+ Details

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Namespace Prefix:	rnr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The increase (decrease) during the period impacting the parent's ownership interest in a subsidiary as it relates to the total (consolidated) equity attributable to the parent. The changes to the parent's ownership interest in a subsidiary represented by this element did not arise in a deconsolidation of the subsidiary from the consolidated financial statements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4M

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591554-111686

+ Details

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

- Definition

Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 23

-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569655-111683



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 24

-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4616395-111683

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of increase in noncontrolling interest from subsidiary issuance of equity interests to noncontrolling interest holders.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- Details

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- Details

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X

- Details

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Namespace Prefix:
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Period Type: