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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 $ 1,099,860,000us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount                      
Comprehensive income:                        
Net income attributable to redeemable noncontrolling interest 153,538,000us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest 151,144,000us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest 148,040,000us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest                  
Balance, Ending 1,131,708,000us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount 1,099,860,000us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount         1,099,860,000us-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       30,000,000rnr_RedeemableNoncontrollingInterestDecreasefromRedemptionsorPurchaseofInterestsReserveHoldbackPayments
/ dei_LegalEntityAxis
= rnr_DavincireMember
               
Activity in redeemable noncontrolling interest                        
Balance, Beginning 1,063,368,000us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
/ dei_LegalEntityAxis
= rnr_DavincireMember
968,259,000us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
/ dei_LegalEntityAxis
= rnr_DavincireMember
      968,259,000us-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 48,576,000us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesIssuanceOfEquityBySubsidiaryToNoncontrollingInterests
/ dei_LegalEntityAxis
= rnr_DavincireMember
153,884,000us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesIssuanceOfEquityBySubsidiaryToNoncontrollingInterests
/ dei_LegalEntityAxis
= rnr_DavincireMember
                   
Comprehensive income:                        
Net income attributable to redeemable noncontrolling interest 149,817,000us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
/ dei_LegalEntityAxis
= rnr_DavincireMember
150,581,000us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
/ dei_LegalEntityAxis
= rnr_DavincireMember
147,499,000us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
/ dei_LegalEntityAxis
= rnr_DavincireMember
                 
Balance, Ending 1,037,306,000us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
/ dei_LegalEntityAxis
= rnr_DavincireMember
1,063,368,000us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
/ dei_LegalEntityAxis
= rnr_DavincireMember
968,259,000us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
/ dei_LegalEntityAxis
= rnr_DavincireMember
      1,063,368,000us-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         300,000,000us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesNet
/ dei_LegalEntityAxis
= rnr_DavincireMember
/ us-gaap_StatementEquityComponentsAxis
= rnr_RedeemableNoncontrollingInterestMember
150,000,000us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesNet
/ dei_LegalEntityAxis
= rnr_DavincireMember
/ us-gaap_StatementEquityComponentsAxis
= rnr_RedeemableNoncontrollingInterestMember
           
Redeemable noncontrolling interest, Reserve holdback       60,000,000rnr_RedeemableNoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterestsReserveHoldback
/ dei_LegalEntityAxis
= rnr_DavincireMember
/ us-gaap_StatementEquityComponentsAxis
= rnr_RedeemableNoncontrollingInterestMember
  20,500,000rnr_RedeemableNoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterestsReserveHoldback
/ dei_LegalEntityAxis
= rnr_DavincireMember
/ us-gaap_StatementEquityComponentsAxis
= rnr_RedeemableNoncontrollingInterestMember
           
Proceeds from sale of partial interest in consolidated subsidiary               38,900,000rnr_ProceedsFromDivestitureOfPartialInterestInConsolidatedSubsidiaries
/ dei_LegalEntityAxis
= rnr_DavincireMember
/ us-gaap_StatementEquityComponentsAxis
= rnr_RedeemableNoncontrollingInterestMember
      77,400,000rnr_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 57,300,000us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance
/ dei_LegalEntityAxis
= rnr_MediciMember
          37,200,000us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance
/ dei_LegalEntityAxis
= rnr_MediciMember
         
Activity in redeemable noncontrolling interest                        
Balance, Beginning 36,492,000us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
/ dei_LegalEntityAxis
= rnr_MediciMember
0us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
/ dei_LegalEntityAxis
= rnr_MediciMember
      0us-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 57,264,000us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesIssuanceOfEquityBySubsidiaryToNoncontrollingInterests
/ dei_LegalEntityAxis
= rnr_MediciMember
37,200,000us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesIssuanceOfEquityBySubsidiaryToNoncontrollingInterests
/ dei_LegalEntityAxis
= rnr_MediciMember
                   
Comprehensive income:                        
Net income attributable to redeemable noncontrolling interest 3,721,000us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
/ dei_LegalEntityAxis
= rnr_MediciMember
617,000us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
/ dei_LegalEntityAxis
= rnr_MediciMember
0us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
/ dei_LegalEntityAxis
= rnr_MediciMember
                 
Balance, Ending 94,402,000us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
/ dei_LegalEntityAxis
= rnr_MediciMember
36,492,000us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
/ dei_LegalEntityAxis
= rnr_MediciMember
0us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
/ dei_LegalEntityAxis
= rnr_MediciMember
      36,492,000us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
/ dei_LegalEntityAxis
= rnr_MediciMember
         
Angus Fund                        
Activity in redeemable noncontrolling interest                        
Balance, Beginning 0us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
/ dei_LegalEntityAxis
= rnr_AngusFundMember
                     
Comprehensive income:                        
Net income attributable to redeemable noncontrolling interest 0us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
/ dei_LegalEntityAxis
= rnr_AngusFundMember
(54,000)us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
/ dei_LegalEntityAxis
= rnr_AngusFundMember
541,000us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
/ dei_LegalEntityAxis
= rnr_AngusFundMember
                 
Balance, Ending $ 0us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
/ dei_LegalEntityAxis
= rnr_AngusFundMember
$ 0us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
/ dei_LegalEntityAxis
= rnr_AngusFundMember
        $ 0us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
/ dei_LegalEntityAxis
= rnr_AngusFundMember