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Subsequent Events (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 1 Months Ended |  |
--- | --- | --- | ---
May 04, 2015 | Mar. 31, 2015 | Apr. 01, 2011
Common Shares | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Common shares repurchased during period, Number of shares | 3 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Common shares repurchased during period, Aggregate amount | $ 300,000 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Common shares repurchased during period, Average cost per share | $ 99.91 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
DaVinciRe |  |  |
Subsequent Event [Line Items] |  |  |
Related party debt to be repaid |  | 100,000,000 us-gaap_LoansAndLeasesReceivableRelatedParties / dei_LegalEntityAxis = rnr_DavincireMember | 200,000,000 us-gaap_LoansAndLeasesReceivableRelatedParties / dei_LegalEntityAxis = rnr_DavincireMember
DaVinciRe | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Related party debt to be repaid | 100,000,000 us-gaap_LoansAndLeasesReceivableRelatedParties / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
DaVinciRe | 4.750% Senior Notes Due May 1, 2025 [Member] | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Debt Instrument, face amount | $ 150,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = rnr_A4.750SeniorNotesDueMay12025Member / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Senior notes interest rate | 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = rnr_A4.750SeniorNotesDueMay12025Member / dei_LegalEntityAxis = rnr_DavincireMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |

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