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Noncontrolling Interests (Schedule Of Redeemable Noncontrolling Interest) (Details) (USD $) | 12 Months Ended | 1 Months Ended | 7 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 28, 2014 | Jan. 31, 2014 | Jan. 31, 2013 | Dec. 31, 2013 | Jul. 01, 2014 | Jun. 30, 2014 | Jan. 01, 2014 | Jan. 02, 2013 | Sep. 30, 2013
Activity in redeemable noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |
Balance, Beginning | $ 1,099,860,000 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount |  |  |  |  |  |  |  |  |  |  |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to redeemable noncontrolling interest | 153,538,000 us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest | 151,144,000 us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest | 148,040,000 us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest |  |  |  |  |  |  |  |  |
Balance, Ending | 1,131,708,000 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount | 1,099,860,000 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount |  |  |  |  | 1,099,860,000 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount |  |  |  |  |
DaVinciRe |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest, ownership percentage | 23.40%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rnr_DavincireMember | 27.30%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rnr_DavincireMember | 30.80%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rnr_DavincireMember |  |  |  | 27.30%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 | 32.90%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rnr_DavincireMember |
Redeemable Noncontrolling Interest Decrease from Redemptions or Purchase of Interests Reserve Holdback Payments |  |  |  | 30,000,000 rnr_RedeemableNoncontrollingInterestDecreasefromRedemptionsorPurchaseofInterestsReserveHoldbackPayments / dei_LegalEntityAxis = rnr_DavincireMember |  |  |  |  |  |  |  |
Activity in redeemable noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |
Balance, Beginning | 1,063,368,000 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = rnr_DavincireMember | 968,259,000 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = rnr_DavincireMember |  |  |  | 968,259,000 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = rnr_DavincireMember |  |  |  |  |  |
Redemption of shares from redeemable noncontrolling interests | (224,455,000)us-gaap_MinorityInterestDecreaseFromRedemptions / dei_LegalEntityAxis = rnr_DavincireMember | (209,356,000)us-gaap_MinorityInterestDecreaseFromRedemptions / dei_LegalEntityAxis = rnr_DavincireMember |  |  |  |  |  |  |  |  |  |
Sale of shares to redeemable noncontrolling interest | 48,576,000 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesIssuanceOfEquityBySubsidiaryToNoncontrollingInterests / dei_LegalEntityAxis = rnr_DavincireMember | 153,884,000 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesIssuanceOfEquityBySubsidiaryToNoncontrollingInterests / dei_LegalEntityAxis = rnr_DavincireMember |  |  |  |  |  |  |  |  |  |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to redeemable noncontrolling interest | 149,817,000 us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest / dei_LegalEntityAxis = rnr_DavincireMember | 150,581,000 us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest / dei_LegalEntityAxis = rnr_DavincireMember | 147,499,000 us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest / dei_LegalEntityAxis = rnr_DavincireMember |  |  |  |  |  |  |  |  |
Balance, Ending | 1,037,306,000 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = rnr_DavincireMember | 1,063,368,000 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = rnr_DavincireMember | 968,259,000 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = rnr_DavincireMember |  |  |  | 1,063,368,000 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = rnr_DavincireMember |  |  |  |  |
DaVinciRe | Redeemable Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption rights for repurchase of initial aggregate shares held, maximum | 50.00%rnr_RedeemableNoncontrollingInterestRedemptionRequirementPercentageOfAggregateSharesHeldMaximum / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_StatementEquityComponentsAxis = rnr_RedeemableNoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest, net redemptions |  |  |  |  | 300,000,000 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesNet / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_StatementEquityComponentsAxis = rnr_RedeemableNoncontrollingInterestMember | 150,000,000 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesNet / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_StatementEquityComponentsAxis = rnr_RedeemableNoncontrollingInterestMember |  |  |  |  |  |
Redeemable noncontrolling interest, Reserve holdback |  |  |  | 60,000,000 rnr_RedeemableNoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterestsReserveHoldback / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_StatementEquityComponentsAxis = rnr_RedeemableNoncontrollingInterestMember |  | 20,500,000 rnr_RedeemableNoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterestsReserveHoldback / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_StatementEquityComponentsAxis = rnr_RedeemableNoncontrollingInterestMember |  |  |  |  |  |
Proceeds from sale of partial interest in consolidated subsidiary |  |  |  |  |  |  |  | 38,900,000 rnr_ProceedsFromDivestitureOfPartialInterestInConsolidatedSubsidiaries / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_StatementEquityComponentsAxis = rnr_RedeemableNoncontrollingInterestMember |  |  |  | 77,400,000 rnr_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] |  |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest, ownership percentage | 53.20%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rnr_MediciMember | 73.90%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rnr_MediciMember |  |  |  |  | 73.90%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rnr_MediciMember |  |  |  |  |
Noncontrolling interest, value subscribed | 57,300,000 us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance / dei_LegalEntityAxis = rnr_MediciMember |  |  |  |  |  | 37,200,000 us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance / dei_LegalEntityAxis = rnr_MediciMember |  |  |  |  |
Activity in redeemable noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |
Balance, Beginning | 36,492,000 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = rnr_MediciMember | 0 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = rnr_MediciMember |  |  |  | 0 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = rnr_MediciMember |  |  |  |  |  |
Redemption of shares from redeemable noncontrolling interests | (3,075,000)us-gaap_MinorityInterestDecreaseFromRedemptions / dei_LegalEntityAxis = rnr_MediciMember | (1,325,000)us-gaap_MinorityInterestDecreaseFromRedemptions / dei_LegalEntityAxis = rnr_MediciMember |  |  |  |  | (1,300,000)us-gaap_MinorityInterestDecreaseFromRedemptions / dei_LegalEntityAxis = rnr_MediciMember |  |  |  |  |
Sale of shares to redeemable noncontrolling interest | 57,264,000 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesIssuanceOfEquityBySubsidiaryToNoncontrollingInterests / dei_LegalEntityAxis = rnr_MediciMember | 37,200,000 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesIssuanceOfEquityBySubsidiaryToNoncontrollingInterests / dei_LegalEntityAxis = rnr_MediciMember |  |  |  |  |  |  |  |  |  |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to redeemable noncontrolling interest | 3,721,000 us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest / dei_LegalEntityAxis = rnr_MediciMember | 617,000 us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest / dei_LegalEntityAxis = rnr_MediciMember | 0 us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest / dei_LegalEntityAxis = rnr_MediciMember |  |  |  |  |  |  |  |  |
Balance, Ending | 94,402,000 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = rnr_MediciMember | 36,492,000 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = rnr_MediciMember | 0 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = rnr_MediciMember |  |  |  | 36,492,000 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = rnr_MediciMember |  |  |  |  |
Angus Fund |  |  |  |  |  |  |  |  |  |  |  |
Activity in redeemable noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |
Balance, Beginning | 0 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = rnr_AngusFundMember |  |  |  |  |  |  |  |  |  |  |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to redeemable noncontrolling interest | 0 us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest / dei_LegalEntityAxis = rnr_AngusFundMember | (54,000)us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest / dei_LegalEntityAxis = rnr_AngusFundMember | 541,000 us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest / dei_LegalEntityAxis = rnr_AngusFundMember |  |  |  |  |  |  |  |  |
Balance, Ending | $ 0 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = rnr_AngusFundMember | $ 0 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = rnr_AngusFundMember |  |  |  |  | $ 0 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / dei_LegalEntityAxis = rnr_AngusFundMember |  |  |  |  |

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- 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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- Definition Proceeds from Divestiture of Partial Interest in Consolidated Subsidiaries + References No definition available. + Details
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- Definition Reserve holdback. + References No definition available. + Details
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- Definition Redeemable Noncontrolling Interest Decrease from Redemptions or Purchase of Interests Reserve Holdback Payments + References No definition available. + Details
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- Definition Redeemable Noncontrolling Interest, Redemption Requirement, Percentage of Aggregate Shares Held, Maximum + References No definition available. + Details
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- Definition Represents a sale (new stock issuance) by a subsidiary to noncontrolling interests (third parties, parties directly or indirectly unrelated to parent) during the period. The capital transaction by subsidiary does not result in a loss of control by the parent, but does effect a change in total (consolidated) equity attributable to the parent. + 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 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 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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- 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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- Definition Amount of Net Income (Loss) attributable to redeemable noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.19) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- 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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- Definition As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 14 -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (16)(c) -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 15 -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (12)(c) -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 + Details
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