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Discontinued Operations (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Jun. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations, Income Tax Expense (Benefit), Discrete Item	$ (13.3)esv_DiscontinuedOperationsIncomeTaxExpenseBenefitDiscreteItem
Gain (loss) on disposal of discontinued operations, net	0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	19.4us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Floaters [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Rigs Committed to be Sold	6esv_NumberofRigsCommittedtobeSold / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember
Floaters [Member] | ENSCO 5000 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from rig sale			1.3us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = esv_ENSCO5000Member / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember
Jackups Member
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Rigs Committed to be Sold	2esv_NumberofRigsCommittedtobeSold / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember
Jackups Member | ENSCO 85 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from rig sale				64.4us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = esv_ENSCO85Member / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember
Jackups Member | ENSCO69andPrideWisconsin [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from rig sale		32.2us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = esv_ENSCO69andPrideWisconsinMember / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal		$ 23.6us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = esv_ENSCO69andPrideWisconsinMember / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember

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- Definition

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Number of Rigs Committed to be Sold

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Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 3B

-URI http://asc.fasb.org/extlink&oid=51716988&loc=SL51721525-107759



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Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



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