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Income Taxes (Narrative) (Details) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2014 jackup | Dec. 31, 2013 jackup | Dec. 31, 2012 jackup
Income Tax Expense (Benefit), Discrete Item |  |  |  |  |  |  | $ 18,400,000 esv_IncomeTaxExpenseBenefitDiscreteItem |  |
Income from continuing operations before income taxes in the U.S. countries |  |  |  |  |  |  | (460,300,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | 173,400,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | 101,100,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Income from continuing operations before income taxes in the non-U.S. countries |  |  |  |  |  |  | (2,088,500,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 1,500,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 1,203,600,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Deferred tax assets related to U.S. foreign tax credits | 159,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign |  | 98,600,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign |  |  |  | 98,600,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign | 159,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign |
Deferred tax assets related to net operating loss carryforwards | 104,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |  | 204,500,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |  |  |  | 204,500,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 104,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |
Net operating loss carryforwards |  |  | 814,500,000 us-gaap_OperatingLossCarryforwards |  |  |  | 814,500,000 us-gaap_OperatingLossCarryforwards |  |
Operating loss carryforwards, Not subject to expiration |  |  | 459,500,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration |  |  |  | 459,500,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration |  |
Operating loss carryforwards, Subject to expiration |  |  | 355,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration |  |  |  | 355,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration |  |
Valuation allowance on NOL carryforwards and FTC |  |  | 267,500,000 esv_ValuationAllowanceOnNolCarryforwardsAndFtcDueToUncertaintyOfRealization |  |  |  | 267,500,000 esv_ValuationAllowanceOnNolCarryforwardsAndFtcDueToUncertaintyOfRealization |  |
Proceeds from Income Tax Refunds |  |  |  |  |  |  | 9,600,000 us-gaap_LitigationSettlementAmount |  |
Valuation Allowance, Deferred Tax Asset, Change in Amount | 7,000,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |  |  |  |  |  | 41,400,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |  |
Asset Impairment Charges |  |  | 3,515,200,000 us-gaap_AssetImpairmentCharges | 0 us-gaap_AssetImpairmentCharges | 703,500,000 us-gaap_AssetImpairmentCharges | 0 us-gaap_AssetImpairmentCharges | 4,218,700,000 us-gaap_AssetImpairmentCharges | 0 us-gaap_AssetImpairmentCharges | 0 us-gaap_AssetImpairmentCharges
Consilidated effective income tax rate excluding discrete items |  |  |  |  |  |  | 10.70%esv_EffectiveIncomeTaxRateContinuingOperationsExcludingDiscreteItems | 12.20%esv_EffectiveIncomeTaxRateContinuingOperationsExcludingDiscreteItems | 12.40%esv_EffectiveIncomeTaxRateContinuingOperationsExcludingDiscreteItems
Restructuring Charges, Tax |  |  |  |  |  |  |  |  | 51,200,000 esv_RestructuringChargesTax
Minimum percentage threshold for recognition of tax benefits |  |  |  |  |  |  | 50.00%esv_PercentRequiredForRecognitionOfTaxBenefitAmounts |  |
Total unrecognized tax benefits | 151,700,000 us-gaap_UnrecognizedTaxBenefits | 110,700,000 us-gaap_UnrecognizedTaxBenefits | 134,400,000 us-gaap_UnrecognizedTaxBenefits |  |  |  | 134,400,000 us-gaap_UnrecognizedTaxBenefits | 151,700,000 us-gaap_UnrecognizedTaxBenefits | 110,700,000 us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions With Net Operating Loss Carryforwards |  |  |  |  |  |  | 18,500,000 esv_UnrecognizedTaxBenefitsIncreaseResultingfromPriorPeriodTaxPositionsWithNetOperatingLossCarryforwards | 21,000,000 esv_UnrecognizedTaxBenefitsIncreaseResultingfromPriorPeriodTaxPositionsWithNetOperatingLossCarryforwards |
Amount of unrecognized tax benefits affecting the consolidated effective income tax rate if recognized |  |  | 110,400,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |  |  | 110,400,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |
Amount of accrued interest and penalties included in other liabilities | 17,300,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued |  | 26,500,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued |  |  |  | 26,500,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued | 17,300,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued |
Amount of interest and penalties recognized in net tax expense |  |  |  |  |  |  | (9,200,000)us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense | 1,600,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense | 2,800,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense
Income tax benefits, inclusive of interest and penalties due to lapses in statute of limitations | 3,100,000 esv_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccruedDueToLapsesInStatuteOfLimitations | 28,600,000 esv_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccruedDueToLapsesInStatuteOfLimitations | 2,400,000 esv_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccruedDueToLapsesInStatuteOfLimitations |  |  |  | 2,400,000 esv_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccruedDueToLapsesInStatuteOfLimitations | 3,100,000 esv_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccruedDueToLapsesInStatuteOfLimitations | 28,600,000 esv_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccruedDueToLapsesInStatuteOfLimitations
Decline in unrecognized tax benefits during next twelve months |  |  | 9,600,000 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit |  |  |  | 9,600,000 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit |  |
Accrued interest and penalty assessments related to the decline in unrecognized tax benefits |  |  | 2,800,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued |  |  |  | 2,800,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued |  |
Number of assets transferred (in drillships or jackups) |  |  |  |  |  |  | 3 esv_NumberOfAssetsTransferred | 2 esv_NumberOfAssetsTransferred | 1 esv_NumberOfAssetsTransferred
Income tax liability from gain on intercompany transfers |  | 1,700,000 esv_IncomeTaxLiabilityTransfersToSubsidiaryGains | 0 esv_IncomeTaxLiabilityTransfersToSubsidiaryGains |  |  |  | 0 esv_IncomeTaxLiabilityTransfersToSubsidiaryGains |  | 1,700,000 esv_IncomeTaxLiabilityTransfersToSubsidiaryGains
Remaining useful life of drilling rigs associated with amortization of deferred income tax expense, minimum years |  |  |  |  |  |  | 15 years |  |
Unamortized deferred charges related to intercompany transfers | 50,200,000 esv_UnamortizedDeferredChargesTransfersToSubsidiary |  | 39,700,000 esv_UnamortizedDeferredChargesTransfersToSubsidiary |  |  |  | 39,700,000 esv_UnamortizedDeferredChargesTransfersToSubsidiary | 50,200,000 esv_UnamortizedDeferredChargesTransfersToSubsidiary |
Amount included in current income taxes for amortization of deferred income taxes related to intercompany transfers |  |  |  |  |  |  | 2,600,000 us-gaap_AmortizationOfDeferredCharges | 4,100,000 us-gaap_AmortizationOfDeferredCharges | 9,100,000 us-gaap_AmortizationOfDeferredCharges
Deferred tax liability related to temporary difference from transferred drilling rigs | 29,200,000 esv_DeferredTaxLiabilityRelatedToTemporaryDifferenceFromTransferredDrillingRigs |  | 23,000,000 esv_DeferredTaxLiabilityRelatedToTemporaryDifferenceFromTransferredDrillingRigs |  |  |  | 23,000,000 esv_DeferredTaxLiabilityRelatedToTemporaryDifferenceFromTransferredDrillingRigs | 29,200,000 esv_DeferredTaxLiabilityRelatedToTemporaryDifferenceFromTransferredDrillingRigs |
Tax benefits included in deferred income tax expense related to amortization of deferred reversing temporary differences from intercompany transfers |  |  |  |  |  |  | 4,800,000 esv_DeferredTaxExpenseBenefitAmortizationOfDeferredCharges | 1,900,000 esv_DeferredTaxExpenseBenefitAmortizationOfDeferredCharges | 3,400,000 esv_DeferredTaxExpenseBenefitAmortizationOfDeferredCharges
Aggregate Indefinitely reinvested undistributed subsidiary earnings. |  | 530,000,000 esv_IndefinitelyReinvestedUndistributedSubsidiaryEarnings |  |  |  |  |  |  |
Undistributed Earnings of Foreign Subsidiaries | 2,100,000,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  | 2,300,000,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |  |  | 2,300,000,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries | 2,100,000,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |
Other Liabilities [Member] |  |  |  |  |  |  |  |  |
Total unrecognized tax benefits | 130,700,000 us-gaap_UnrecognizedTaxBenefits / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember |  | 115,900,000 us-gaap_UnrecognizedTaxBenefits / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember |  |  |  | 115,900,000 us-gaap_UnrecognizedTaxBenefits / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember | 130,700,000 us-gaap_UnrecognizedTaxBenefits / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember |
Minimum [Member] |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Foreign, Expiration Date |  |  |  |  |  |  | 2017 |  |
Operating loss carryforwards tax credits expiration year |  |  |  |  |  |  | 2015 |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Foreign, Expiration Date |  |  |  |  |  |  | 2023 |  |
Operating loss carryforwards tax credits expiration year |  |  |  |  |  |  | 2020 |  |
Mexican Tax Authority [Member] |  |  |  |  |  |  |  |  |
Deferred Tax Liabilities, Gross |  |  |  |  |  |  |  | 7,400,000 esv_Discretetaxexpense / us-gaap_IncomeTaxAuthorityAxis = us-gaap_MexicanTaxAuthorityMember |
Proceeds from Income Tax Refunds |  |  |  |  |  |  |  | 30,600,000 us-gaap_LitigationSettlementAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_MexicanTaxAuthorityMember |
Rig Impairments [Member] |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit), Discrete Item |  |  |  |  |  |  | $ 16,400,000 esv_IncomeTaxExpenseBenefitDiscreteItem / esv_ImpairmentofLongLivedAssetsAxis = esv_RigImpairmentsMember |  |

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