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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 | $ 207,898,000 us-gaap_MinorityInterestDecreaseFromRedemptions / dei_LegalEntityAxis = rnr_DavincireMember | $ 218,879,000 us-gaap_MinorityInterestDecreaseFromRedemptions / dei_LegalEntityAxis = rnr_DavincireMember |  |  |  |  |  |  |
DaVinciRe | Redeemable Noncontrolling Interest |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest, net redemptions |  |  | 225,000,000 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesNet / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_StatementEquityComponentsAxis = rnr_RedeemableNoncontrollingInterestMember | 300,000,000 us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesNet / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_StatementEquityComponentsAxis = rnr_RedeemableNoncontrollingInterestMember |  |  |  |  |
Redeemable noncontrolling interest, reserve holdback |  |  | 22,500,000 rnr_RedeemableNoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterestsReserveHoldback / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_StatementEquityComponentsAxis = rnr_RedeemableNoncontrollingInterestMember | 30,000,000 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 |  |
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 | 19,600,000 us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance / dei_LegalEntityAxis = rnr_MediciMember |  |  |  | 57,300,000 us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance / dei_LegalEntityAxis = rnr_MediciMember |  |  |  |
Redemption of shares from redeemable noncontrolling interest | $ 14,684,000 us-gaap_MinorityInterestDecreaseFromRedemptions / dei_LegalEntityAxis = rnr_MediciMember | $ 1,875,000 us-gaap_MinorityInterestDecreaseFromRedemptions / dei_LegalEntityAxis = rnr_MediciMember |  |  | $ 3,100,000 us-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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- Definition Noncontrolling Interest, Redemption Provision, Notice Period + 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 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 increase in noncontrolling interest from subsidiary issuance of equity interests to noncontrolling interest holders. + References No definition available. + Details
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- Details
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- Details
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