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Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Apr. 30, 2014 | Mar. 31, 2015 occurrence plaintiffs | Mar. 31, 2014 | Mar. 31, 2009 mi
Oil and Gas Delivery Commitments and Contracts [Line Items] |  |  |  |
Distance from original drilling location in miles |  |  |  | 95 esv_DistanceFromOriginalDrillingLocation
Loss Contingency, Damages Sought, Value |  | $ 5.0 us-gaap_LossContingencyDamagesSoughtValue |  |
Civil litigation claim damages for cost of repair and business interruption due to pipeline rupture |  | 26.0 esv_CivilLitigationDamagesPipelineRupture |  |
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 |  |
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 |  |
Litigation Settlement, Amount |  |  | 9.6 us-gaap_LitigationSettlementAmount |
Number of plaintiffs |  | 125 esv_NumberOfPlaintiffs |  |
Loss Contingency, Claims Settled, Number |  | 58 us-gaap_LossContingencyClaimsSettledNumber |  |
Letters of Credit Outstanding, Amount |  | 260.2 us-gaap_LettersOfCreditOutstandingAmount |  |
Legal Fees |  |  | 3.6 us-gaap_LegalFees |
Payments for Legal Settlements | 6.4 us-gaap_PaymentsForLegalSettlements |  |  |
Litigation Settlement, Amount Paid by Underwriters |  |  | 3.2 esv_LitigationSettlementAmountPaidbyUnderwriters |
ENSCO 29 [Member] |  |  |  |
Oil and Gas Delivery Commitments and Contracts [Line Items] |  |  |  |
Annual liability coverage limit for wreckage and debris removal costs |  | $ 3.8 esv_LiabilityCoverageLimitWreckageAndDebrisRemovalCosts / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = esv_ENSCO29Member |  |

X
- Definition Civil litigation damages pipeline rupture + References No definition available. + Details
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Namespace Prefix: | esv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Distance from original drilling location + References No definition available. + Details
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Namespace Prefix: | esv_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Liability coverage limit wreckage and debris removal costs + References No definition available. + Details
Name: | esv_LiabilityCoverageLimitWreckageAndDebrisRemovalCosts
Namespace Prefix: | esv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Liability Insurance Self Insured Retention For Each Occurrence Thereafter + References No definition available. + Details
Name: | esv_LiabilityInsuranceSelfInsuredRetentionForEachOccurrenceThereafter
Namespace Prefix: | esv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Liability insurance self insured retention per multiple occurrence + References No definition available. + Details
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Namespace Prefix: | esv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Liability insurance self insured retention per occurrence + References No definition available. + Details
Name: | esv_LiabilityInsuranceSelfInsuredRetentionPerOccurrence
Namespace Prefix: | esv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Litigation Settlement, Amount Paid by Underwriters + References No definition available. + Details
Name: | esv_LitigationSettlementAmountPaidbyUnderwriters
Namespace Prefix: | esv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of Occurrences + References No definition available. + Details
Name: | esv_NumberOfOccurrences
Namespace Prefix: | esv_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of plaintiffs + References No definition available. + Details
Name: | esv_NumberOfPlaintiffs
Namespace Prefix: | esv_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of claims settled. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585 + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |