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Subsequent Events (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 2 Months Ended | 3 Months Ended |  |  |  |  |  |  |  |  |
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Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2015 | Mar. 31, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Jul. 01, 2014 | Jun. 30, 2014 | Jan. 01, 2014 | Dec. 31, 2013 | Jan. 02, 2013 | Dec. 31, 2012 | Feb. 28, 2014 | Jan. 01, 2015
DaVinciRe |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest, ownership percentage |  |  |  |  |  | 23.40%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 | 27.30%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rnr_DavincireMember | 32.90%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rnr_DavincireMember | 30.80%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rnr_DavincireMember |  |
Redeemable Noncontrolling Interest | DaVinciRe |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest, net redemptions | $ 300.0 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesNet / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_StatementEquityComponentsAxis = rnr_RedeemableNoncontrollingInterestMember | $ 150.0 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesNet / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_StatementEquityComponentsAxis = rnr_RedeemableNoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest, Reserve holdback |  | 20.5 rnr_RedeemableNoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterestsReserveHoldback / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_StatementEquityComponentsAxis = rnr_RedeemableNoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |  | 60.0 rnr_RedeemableNoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterestsReserveHoldback / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_StatementEquityComponentsAxis = rnr_RedeemableNoncontrollingInterestMember |
Subsequent Event | DaVinciRe |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 26.30%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent Event | Upsilon RFO | Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital returned to investors |  |  | 317.5 rnr_ConsolidationLessthanWhollyOwnedSubsidiaryParentOwnershipInterestChangesReturnofCapital / dei_LegalEntityAxis = rnr_UpsilonRFOMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 35.3 rnr_ConsolidationLessthanWhollyOwnedSubsidiaryParentOwnershipInterestChangesReturnofCapital / dei_LegalEntityAxis = rnr_UpsilonRFOMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 352.8 rnr_ConsolidationLessthanWhollyOwnedSubsidiaryParentOwnershipInterestChangesReturnofCapital / dei_LegalEntityAxis = rnr_UpsilonRFOMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |  |  |  |  |  |  |  |
Subsequent Event | Redeemable Noncontrolling Interest | DaVinciRe |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest, net redemptions |  |  | 225.0 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesNet / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_StatementEquityComponentsAxis = rnr_RedeemableNoncontrollingInterestMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest, Reserve holdback |  |  | $ 45.0 rnr_RedeemableNoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterestsReserveHoldback / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_StatementEquityComponentsAxis = rnr_RedeemableNoncontrollingInterestMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |  |  |  |  |  |

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- Definition Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Return of Capital + References No definition available. + Details
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Namespace Prefix: | rnr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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

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- 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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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Balance Type: |
Period Type: |