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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				95esv_DistanceFromOriginalDrillingLocation
Loss Contingency, Damages Sought, Value		$ 5.0us-gaap_LossContingencyDamagesSoughtValue
Civil litigation claim damages for cost of repair and business interruption due to pipeline rupture		26.0esv_CivilLitigationDamagesPipelineRupture
Liability insurance self-insured retention per occurrence		10.0esv_LiabilityInsuranceSelfInsuredRetentionPerOccurrence
Annual liability coverage limit for wreckage and debris removal costs		490.0esv_LiabilityCoverageLimitWreckageAndDebrisRemovalCosts
Liability insurance self-insured retention		15.0esv_LiabilityInsuranceSelfInsuredRetentionPerMultipleOccurrence
Number of Occurrences		2esv_NumberOfOccurrences
Liability insurance self insured retention for each occurrence thereafter		1.0esv_LiabilityInsuranceSelfInsuredRetentionForEachOccurrenceThereafter
Litigation Settlement, Amount			9.6us-gaap_LitigationSettlementAmount
Number of plaintiffs		125esv_NumberOfPlaintiffs
Loss Contingency, Claims Settled, Number		58us-gaap_LossContingencyClaimsSettledNumber
Letters of Credit Outstanding, Amount		260.2us-gaap_LettersOfCreditOutstandingAmount
Legal Fees			3.6us-gaap_LegalFees
Payments for Legal Settlements	6.4us-gaap_PaymentsForLegalSettlements
Litigation Settlement, Amount Paid by Underwriters			3.2esv_LitigationSettlementAmountPaidbyUnderwriters
ENSCO 29 [Member]
Oil and Gas Delivery Commitments and Contracts [Line Items]
Annual liability coverage limit for wreckage and debris removal costs		$ 3.8esv_LiabilityCoverageLimitWreckageAndDebrisRemovalCosts / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = esv_ENSCO29Member

X

- Definition

Civil litigation damages pipeline rupture

+ References

No definition available.

+ Details

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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_
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X

- Definition

Liability coverage limit wreckage and debris removal costs

+ References

No definition available.

+ Details

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Namespace Prefix:	esv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Liability Insurance Self Insured Retention For Each Occurrence Thereafter

+ References

No definition available.

+ Details

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Namespace Prefix:	esv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- 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

X

- Definition

Liability insurance self insured retention per occurrence

+ References

No definition available.

+ Details

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Namespace Prefix:	esv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Litigation Settlement, Amount Paid by Underwriters

+ References

No definition available.

+ Details

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Namespace Prefix:	esv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Number of Occurrences

+ References

No definition available.

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Data Type:	xbrli:integerItemType
Balance Type:	na
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- Definition

Number of plaintiffs

+ References

No definition available.

+ Details

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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

+ References

No definition available.

+ Details

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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

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Data Type:	xbrli:stringItemType
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X

- 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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Balance Type:	credit
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