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Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 occurrence plaintiffs | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2009 mi
Oil and Gas Delivery Commitments and Contracts [Line Items] |  |  |  |
Aggregate Contractual Capital Commitments Due In One Year | $ 1,353.5 esv_AggregateContractualCapitalCommitmentsDueInOneYear |  |  |
Rental expenses | 54.4 us-gaap_LeaseAndRentalExpense | 49.1 us-gaap_LeaseAndRentalExpense | 46.9 us-gaap_LeaseAndRentalExpense |
2014 | 77.3 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent |  |  |
2015 | 31.8 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears |  |  |
2016 | 16.2 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears |  |  |
2017 | 10.6 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears |  |  |
2018 | 10.2 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears |  |  |
Thereafter | 55.0 us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter |  |  |
Distance from original drilling location in miles |  |  |  | 95 esv_DistanceFromOriginalDrillingLocation
Liability insurance self-insured retention per occurrence | 10.0 esv_LiabilityInsuranceSelfInsuredRetentionPerOccurrence |  |  |
Annual liability coverage limit for wreckage and debris removal costs | 490.0 esv_LiabilityCoverageLimitWreckageAndDebrisRemovalCosts |  |  |
Damages sought | 5.0 us-gaap_LossContingencyDamagesSoughtValue |  |  |
Civil litigation claim damages for cost of repairs and business interruption due to pipeline rupture | 26.0 esv_CivilLitigationDamagesPipelineRupture |  |  |
Litigation Settlement, Amount | 9.6 us-gaap_LitigationSettlementAmount |  |  |
Legal Fees | 3.6 us-gaap_LegalFees |  |  |
Estimated Litigation Liability | 6.4 us-gaap_LitigationReserve |  |  |
Litigation Settlement, Amount to be Paid by Underwriters | 3.2 esv_LitigationSettlementAmounttobePaidbyUnderwriters |  |  |
Liability insurance self-insured retention | 15.0 esv_LiabilityInsuranceSelfInsuredRetentionPerMultipleOccurrence |  |  |
Number of occurrences | 2 esv_NumberOfOccurrences |  |  |
Liability insurance self-insured retention for each occurrence thereafter | 1.0 esv_LiabilityInsuranceSelfInsuredRetentionForEachOccurrenceThereafter |  |  |
Number of plaintiffs | 125 esv_NumberOfPlaintiffs |  |  |
Loss Contingency, Claims Settled, Number | 58 us-gaap_LossContingencyClaimsSettledNumber |  |  |
Letters of Credit Outstanding, Amount | 263.9 us-gaap_LettersOfCreditOutstandingAmount |  |  |
Rig Enhancement Projects [Member] |  |  |  |
Oil and Gas Delivery Commitments and Contracts [Line Items] |  |  |  |
Aggregate Contractual Capital Commitments Due In One Year | 42.8 esv_AggregateContractualCapitalCommitmentsDueInOneYear / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_RigEnhancementProjectsMember |  |  |
Ensco 29 [Member] |  |  |  |
Oil and Gas Delivery Commitments and Contracts [Line Items] |  |  |  |
Annual liability coverage limit for wreckage and debris removal costs | $ 4.0 esv_LiabilityCoverageLimitWreckageAndDebrisRemovalCosts / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = esv_Ensco29Member |  |  |

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