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Discontinued Operations (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended
Oct. 01, 2013
Mar. 04, 2011
Jun. 01, 2012
REAL      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from sale of business $ 60.0us-gaap_ProceedsFromDivestitureOfBusinesses
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= rnr_REALMember
   
Loss on sale 8.8us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
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U.S.-based insurance operations      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from sale of business   269.5us-gaap_ProceedsFromDivestitureOfBusinesses
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U.S.-based insurance operations | Reserve Collar      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Payment related to Reserve Collar     $ 9.0us-gaap_LossContingencyAccrualCarryingValuePayments
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= rnr_FormerU.S.basedInsuranceoperationsMember
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= rnr_ReserveCollarMember