XML 117 R84.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Reserve for Claims and Claim Expenses (Narrative) (Details) (USD $) | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 01, 2012
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | $ 143,798,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense | $ 143,954,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense | $ 157,969,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense |
Reinsurance Balances Payable |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Aggregate deposit liabilities | 39,000,000 us-gaap_DepositContractsLiabilities / us-gaap_BalanceSheetLocationAxis = rnr_ReinsuranceBalancesPayableMember | 39,700,000 us-gaap_DepositContractsLiabilities / us-gaap_BalanceSheetLocationAxis = rnr_ReinsuranceBalancesPayableMember |  |
Aggregate deposit assets |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Aggregate deposit assets | 0 us-gaap_DepositContractsAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember | 0 us-gaap_DepositContractsAssets / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember |  |
Deposit Contracts, Underwriting Risk Only |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Increase (decrease) in net claims and claim expenses related to assumed reinsurance contracts | (300,000)us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_DepositContractsUnderwritingRiskOnlyMember | (400,000)us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_DepositContractsUnderwritingRiskOnlyMember | (100,000)us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_DepositContractsUnderwritingRiskOnlyMember |
Deposit Contracts, Timing Risk Only |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Increase (decrease) in other income related to assumed reinsurance contracts | (100,000)rnr_ReinsuranceEffectOnOtherIncomeAmountAssumed / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_DepositContractsTimingRiskOnlyMember | (100,000)rnr_ReinsuranceEffectOnOtherIncomeAmountAssumed / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_DepositContractsTimingRiskOnlyMember | (7,500,000)rnr_ReinsuranceEffectOnOtherIncomeAmountAssumed / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_DepositContractsTimingRiskOnlyMember |
Catastrophe |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 92,366,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember | 111,496,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember | 124,215,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember |
Catastrophe | Large Catastrophe Event |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 65,537,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember | 94,527,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember | 76,390,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember |
Catastrophe | Hurricanes Katrina, Rita and Wilma (2005) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  |  | 7,730,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesKatrinaRitaAndWilma2005Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember |
Catastrophe | Hurricanes Gustav and Ike (2008) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 6,647,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember | 16,665,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember | 20,467,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember |
Catastrophe | European Floods (2013) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 7,552,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_EuropeanFloods2013Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember |  |  |
Catastrophe | Storm Sandy (2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 24,232,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_StormSandy2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember | 48,285,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_StormSandy2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember |  |
Catastrophe | Tohoku Earthquake and Tsunami (2011) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 5,131,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember | 19,033,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember | 3,896,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember |
Catastrophe | New Zealand Earthquake (2011) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  | 10,944,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember | (17,912,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember |
Catastrophe | New Zealand Earthquake (2010) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | (24,692,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember | (11,340,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember | (3,570,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember |
Catastrophe | U.S. PCS 70 and 73 Wind and Thunderstorm (2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | (13,362,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS73WindandThunderstorm2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember |  |  |
Catastrophe | Hurricane Isaac (2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  | (2,610,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIsaac2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember |  |
Catastrophe | Thailand Floods (2011) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 11,754,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_ThailandFloods2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember |  | 9,433,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_ThailandFloods2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember |
Catastrophe | Hurricane Irene (2011) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 4,506,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIrene2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember |  | 7,130,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIrene2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember |
Catastrophe | Other |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 13,704,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember | 5,306,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember | 3,953,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember |
Catastrophe | Small Catastrophe Event |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 26,829,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember | 16,969,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember | 47,825,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember |
Catastrophe | U.S. PCS 70 Wind and Thunderstorm (2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  | (8,225,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS70WindandThunderstorm2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember |  |
Catastrophe | April and May U.S. Tornadoes 2011 |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 13,939,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_AprilandMayU.S.Tornadoes2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember |  |  |
Catastrophe | U.S. PCS 24 Wind and Thunderstorm (2013) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 6,712,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS24WindandThunderstorm2013Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember |  |  |
Catastrophe | LIBOR (2011 and 2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 11,750,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LIBOR2011and2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember |  |  |
Catastrophe | Subprime (2007) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | (5,049,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_Subprime2007Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember |  |  |
Actuarial Assumption Changes |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  | 10,158,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ChangeInActuarialAssumptionMember | 13,114,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ChangeInActuarialAssumptionMember |
Actual Reported Claims Less than Expected Claims |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 51,432,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember | 22,300,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember | 20,640,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember |
Attritional Claims and Claim Expenses |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 51,432,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember | 32,458,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember | 33,754,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember |
Catastrophe Reinsurance |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 65,511,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 102,037,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 110,568,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |
Catastrophe Reinsurance | Catastrophe |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 65,511,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 102,037,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 110,568,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |
Catastrophe Reinsurance | Catastrophe | Large Catastrophe Event |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 47,506,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 85,068,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 62,743,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |
Catastrophe Reinsurance | Catastrophe | Hurricanes Katrina, Rita and Wilma (2005) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Initial estimated ultimate claim | 1,300,000,000 rnr_LiabilityForClaimsAndClaimsAdjustmentExpenseInitialEstimatedClaims / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesKatrinaRitaAndWilma2005Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |  |  |
Liability for unpaid claims and claim expenses |  |  | 6,420,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesKatrinaRitaAndWilma2005Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |
Catastrophe Reinsurance | Catastrophe | Hurricanes Gustav and Ike (2008) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Initial estimated ultimate claim | 530,000,000 rnr_LiabilityForClaimsAndClaimsAdjustmentExpenseInitialEstimatedClaims / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |  |  |
Liability for unpaid claims and claim expenses | 6,647,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 16,261,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 17,541,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |
Catastrophe Reinsurance | Catastrophe | New Zealand Earthquake, Tohoku Earthquake, United States Tornadoes, Australian Floods, Hurricane Irene, Thailand Floods |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Initial estimated ultimate claim | 1,100,000,000 rnr_LiabilityForClaimsAndClaimsAdjustmentExpenseInitialEstimatedClaims / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_A2011NewZealandEarthquaketheTohokuEarthquakethelargeU.S.tornadoesfloodinginAustraliacertainaggregatelossesHurricaneIreneandtheThailandFloodsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |  |  |
Catastrophe Reinsurance | Catastrophe | European Floods (2013) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 7,552,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_EuropeanFloods2013Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |  |  |
Catastrophe Reinsurance | Catastrophe | Storm Sandy (2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 20,104,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_StormSandy2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 44,460,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_StormSandy2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |  |
Catastrophe Reinsurance | Catastrophe | Tohoku Earthquake and Tsunami (2011) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 3,489,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 18,033,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 3,896,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |
Catastrophe Reinsurance | Catastrophe | New Zealand Earthquake (2011) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  | 10,944,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | (17,912,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |
Catastrophe Reinsurance | Catastrophe | New Zealand Earthquake (2010) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | (24,692,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | (11,040,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | (3,570,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |
Catastrophe Reinsurance | Catastrophe | U.S. PCS 70 and 73 Wind and Thunderstorm (2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | (13,362,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS73WindandThunderstorm2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |  |  |
Catastrophe Reinsurance | Catastrophe | Hurricane Isaac (2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  | (2,610,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIsaac2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |  |
Catastrophe Reinsurance | Catastrophe | Thailand Floods (2011) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 9,254,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_ThailandFloods2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |  | 3,933,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_ThailandFloods2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |
Catastrophe Reinsurance | Catastrophe | Hurricane Irene (2011) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 4,506,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIrene2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |  | 4,630,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIrene2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |
Catastrophe Reinsurance | Catastrophe | Other |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 10,644,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 776,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 2,542,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |
Catastrophe Reinsurance | Catastrophe | Small Catastrophe Event |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 18,005,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 16,969,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 47,825,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |
Catastrophe Reinsurance | Catastrophe | U.S. PCS 70 Wind and Thunderstorm (2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  | (8,225,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS70WindandThunderstorm2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |  |
Catastrophe Reinsurance | Catastrophe | April and May U.S. Tornadoes 2011 |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 13,939,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_AprilandMayU.S.Tornadoes2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |  |  |
Catastrophe Reinsurance | Catastrophe | U.S. PCS 24 Wind and Thunderstorm (2013) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 6,712,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS24WindandThunderstorm2013Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |  |  |
Catastrophe Reinsurance | Catastrophe | LIBOR (2011 and 2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LIBOR2011and2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |  |  |
Catastrophe Reinsurance | Catastrophe | Subprime (2007) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_Subprime2007Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |  |  |
Catastrophe Reinsurance | Catastrophe Claims and Claim Expense Excluding Certain Specific Events |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  | (34,214,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_CatastropheClaimsandClaimExpenseExcludingCertainSpecificEventsMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 84,225,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_CatastropheClaimsandClaimExpenseExcludingCertainSpecificEventsMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |
Catastrophe Reinsurance | Actuarial Assumption Changes |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ChangeInActuarialAssumptionMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ChangeInActuarialAssumptionMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |
Catastrophe Reinsurance | Actual Reported Claims Less than Expected Claims |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |
Catastrophe Reinsurance | Attritional Claims and Claim Expenses |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = rnr_CatastropheReinsuranceSegmentMember |
Specialty Reinsurance |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 55,909,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 34,111,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 34,146,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |
Specialty Reinsurance | Catastrophe |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 11,419,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 2,463,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 3,000,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |
Specialty Reinsurance | Catastrophe | Large Catastrophe Event |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 11,419,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 2,463,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 3,000,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |
Specialty Reinsurance | Catastrophe | Hurricanes Katrina, Rita and Wilma (2005) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  |  | 3,000,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesKatrinaRitaAndWilma2005Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |
Specialty Reinsurance | Catastrophe | Hurricanes Gustav and Ike (2008) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |
Specialty Reinsurance | Catastrophe | European Floods (2013) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_EuropeanFloods2013Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |  |  |
Specialty Reinsurance | Catastrophe | Storm Sandy (2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_StormSandy2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_StormSandy2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |  |
Specialty Reinsurance | Catastrophe | Tohoku Earthquake and Tsunami (2011) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 1,642,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 1,000,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |
Specialty Reinsurance | Catastrophe | New Zealand Earthquake (2011) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |
Specialty Reinsurance | Catastrophe | New Zealand Earthquake (2010) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | (300,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |
Specialty Reinsurance | Catastrophe | U.S. PCS 70 and 73 Wind and Thunderstorm (2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS73WindandThunderstorm2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |  |  |
Specialty Reinsurance | Catastrophe | Hurricane Isaac (2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIsaac2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |  |
Specialty Reinsurance | Catastrophe | Thailand Floods (2011) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 2,500,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_ThailandFloods2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |  | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_ThailandFloods2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |
Specialty Reinsurance | Catastrophe | Hurricane Irene (2011) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIrene2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |  | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIrene2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |
Specialty Reinsurance | Catastrophe | Other |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 1,826,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 1,763,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |
Specialty Reinsurance | Catastrophe | Small Catastrophe Event |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |
Specialty Reinsurance | Catastrophe | U.S. PCS 70 Wind and Thunderstorm (2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS70WindandThunderstorm2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |  |
Specialty Reinsurance | Catastrophe | April and May U.S. Tornadoes 2011 |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_AprilandMayU.S.Tornadoes2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |  |  |
Specialty Reinsurance | Catastrophe | U.S. PCS 24 Wind and Thunderstorm (2013) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS24WindandThunderstorm2013Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |  |  |
Specialty Reinsurance | Catastrophe | LIBOR (2011 and 2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 10,500,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LIBOR2011and2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |  |  |
Specialty Reinsurance | Catastrophe | Subprime (2007) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | (5,049,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_Subprime2007Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |  |  |
Specialty Reinsurance | Actuarial Assumption Changes |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  | 10,432,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ChangeInActuarialAssumptionMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 14,399,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ChangeInActuarialAssumptionMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |
Specialty Reinsurance | Reported Claims Less than Expected Including Catastrophe Events |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  | 23,679,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessthanExpectedIncludingCertainCatastropheEventsMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |  |
Specialty Reinsurance | Actual Reported Claims Less than Expected Claims |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 44,490,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 21,216,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 16,747,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |
Specialty Reinsurance | Attritional Claims and Claim Expenses |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 44,490,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 31,648,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember | 31,146,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = rnr_SpecialtyReinsuranceSegmentMember |
Lloyd's |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 16,241,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 8,256,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 16,202,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |
Lloyd's | Catastrophe |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 9,299,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 5,267,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 9,476,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |
Lloyd's | Catastrophe | Large Catastrophe Event |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 6,612,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 5,267,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 9,476,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |
Lloyd's | Catastrophe | Hurricanes Katrina, Rita and Wilma (2005) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  |  | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesKatrinaRitaAndWilma2005Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |
Lloyd's | Catastrophe | Hurricanes Gustav and Ike (2008) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |
Lloyd's | Catastrophe | European Floods (2013) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_EuropeanFloods2013Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |  |  |
Lloyd's | Catastrophe | Storm Sandy (2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 4,128,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_StormSandy2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 3,825,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_StormSandy2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |  |
Lloyd's | Catastrophe | Tohoku Earthquake and Tsunami (2011) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |
Lloyd's | Catastrophe | New Zealand Earthquake (2011) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |
Lloyd's | Catastrophe | New Zealand Earthquake (2010) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |
Lloyd's | Catastrophe | U.S. PCS 70 and 73 Wind and Thunderstorm (2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS73WindandThunderstorm2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |  |  |
Lloyd's | Catastrophe | Hurricane Isaac (2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIsaac2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |  |
Lloyd's | Catastrophe | Thailand Floods (2011) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_ThailandFloods2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |  | 5,500,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_ThailandFloods2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |
Lloyd's | Catastrophe | Hurricane Irene (2011) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIrene2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |  | 2,500,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIrene2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |
Lloyd's | Catastrophe | Other |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 1,234,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 1,442,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 1,476,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |
Lloyd's | Catastrophe | Small Catastrophe Event |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 2,687,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |
Lloyd's | Catastrophe | U.S. PCS 70 Wind and Thunderstorm (2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS70WindandThunderstorm2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |  |
Lloyd's | Catastrophe | April and May U.S. Tornadoes 2011 |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_AprilandMayU.S.Tornadoes2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |  |  |
Lloyd's | Catastrophe | U.S. PCS 24 Wind and Thunderstorm (2013) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS24WindandThunderstorm2013Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |  |  |
Lloyd's | Catastrophe | LIBOR (2011 and 2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 1,250,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LIBOR2011and2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |  |  |
Lloyd's | Catastrophe | Subprime (2007) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_Subprime2007Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |  |  |
Lloyd's | Actuarial Assumption Changes |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  | (274,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ChangeInActuarialAssumptionMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | (1,285,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ChangeInActuarialAssumptionMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |
Lloyd's | Actuarial Assumption Changes | Other |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  |  | 1,300,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ChangeInActuarialAssumptionMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |
Lloyd's | Actual Reported Claims Less than Expected Claims |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 6,942,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 3,263,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 8,011,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |
Lloyd's | Attritional Claims and Claim Expenses |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 6,942,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 2,989,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember | 6,726,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = rnr_LloydsSegmentMember |
Other |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 6,137,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (450,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (2,947,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Other | Catastrophe |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 6,137,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 1,729,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 1,171,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Other | Catastrophe | Large Catastrophe Event |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 1,729,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 1,171,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LargeCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Other | Catastrophe | Hurricanes Katrina, Rita and Wilma (2005) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  |  | (1,690,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesKatrinaRitaAndWilma2005Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Other | Catastrophe | Hurricanes Gustav and Ike (2008) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 404,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 2,926,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricanesGustavAndIke2008Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Other | Catastrophe | European Floods (2013) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_EuropeanFloods2013Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |
Other | Catastrophe | Storm Sandy (2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_StormSandy2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_StormSandy2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |
Other | Catastrophe | Tohoku Earthquake and Tsunami (2011) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_TohokuEarthquakeAndTsunami2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Other | Catastrophe | New Zealand Earthquake (2011) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Other | Catastrophe | New Zealand Earthquake (2010) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_NewZealandEarthquake2010Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Other | Catastrophe | U.S. PCS 70 and 73 Wind and Thunderstorm (2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS73WindandThunderstorm2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |
Other | Catastrophe | Hurricane Isaac (2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIsaac2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |
Other | Catastrophe | Thailand Floods (2011) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_ThailandFloods2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_ThailandFloods2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Other | Catastrophe | Hurricane Irene (2011) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIrene2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_HurricaneIrene2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Other | Catastrophe | Other |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 1,325,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (65,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_OtherLargeCatastropheEventsMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Other | Catastrophe | Small Catastrophe Event |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 6,137,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_SmallCatastropheEventMember / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Other | Catastrophe | U.S. PCS 70 Wind and Thunderstorm (2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS70WindandThunderstorm2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |
Other | Catastrophe | April and May U.S. Tornadoes 2011 |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_AprilandMayU.S.Tornadoes2011Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |
Other | Catastrophe | U.S. PCS 24 Wind and Thunderstorm (2013) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_UnitedStatesPCS24WindandThunderstorm2013Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |
Other | Catastrophe | LIBOR (2011 and 2012) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_LIBOR2011and2012Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |
Other | Catastrophe | Subprime (2007) |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis = rnr_Subprime2007Member / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = us-gaap_CatastropheMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  |  |
Other | Actuarial Assumption Changes |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ChangeInActuarialAssumptionMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ChangeInActuarialAssumptionMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Other | Actual Reported Claims Less than Expected Claims |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (2,179,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (4,118,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_ReportedClaimsLessThanExpectedMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Other | Attritional Claims and Claim Expenses |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses | 0 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (2,179,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (4,118,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_AttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Other | Loss Portfolio Transfer, Cash Consideration Paid |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  |  |  | (36,500,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_LossPortfolioTransferCashConsiderationPaidMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Loss Portfolio Transfer, Attritional Claims and Claim Expenses |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  |  |  | 29,100,000 us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_LossPortfolioTransferAttritionalClaimsAndClaimExpensesMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other | Loss Portfolio Transfer, Loss Recognized |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Liability for unpaid claims and claim expenses |  |  |  | $ (7,400,000)us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense / rnr_NetClaimsAndClaimsExpenseByExpenseAxis = rnr_LossPortfolioTransferLossRecognizedMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember

X
- Definition Liability for Claims and Claims Adjustment Expense, Initial Estimated Claims + References No definition available. + Details
Name: | rnr_LiabilityForClaimsAndClaimsAdjustmentExpenseInitialEstimatedClaims
Namespace Prefix: | rnr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Reinsurance Effect on Other Income, Amount Assumed + References No definition available. + Details
Name: | rnr_ReinsuranceEffectOnOtherIncomeAmountAssumed
Namespace Prefix: | rnr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount of assets as of the balance sheet date pertaining to amounts paid by the insured (including a ceding company) under insurance or reinsurance contracts for which insurance risk is not transferred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6387650&loc=d3e9420-108338 + Details
Name: | us-gaap_DepositContractsAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount of liabilities as of the balance sheet date pertaining to amounts received by the insurer or reinsurer from the insured (including a ceding company) under insurance or reinsurance contracts for which insurance risk is not transferred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6387650&loc=d3e9420-108338 + Details
Name: | us-gaap_DepositContractsLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of policy benefits and costs incurred for policies assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6811-158387 + Details
Name: | us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expense for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 18 -Article 12 + Details
Name: | us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | rnr_NetClaimsAndClaimsExpenseByExpenseAxis=rnr_AttritionalClaimsAndClaimExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | rnr_NetClaimsAndClaimsExpenseByExpenseAxis=rnr_ChangeInActuarialAssumptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | rnr_NetClaimsAndClaimsExpenseByExpenseAxis=rnr_ReportedClaimsLessThanExpectedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | rnr_NetClaimsAndClaimsExpenseByExpenseAxis=us-gaap_CatastropheMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=rnr_ReinsuranceBalancesPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=rnr_DepositContractsTimingRiskOnlyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=rnr_DepositContractsUnderwritingRiskOnlyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=rnr_CatastropheReinsuranceSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=rnr_LloydsSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=rnr_SpecialtyReinsuranceSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_AllOtherSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |