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Discontinued Operations (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended | 32 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 rigs | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 | Mar. 31, 2014 | Sep. 30, 2014 | Mar. 31, 2013 | Dec. 31, 2014 rigs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Rigs Committed To Be Sold | 5 esv_NumberOfRigsCommittedToBeSold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax Gain/(Loss) |  |  |  |  |  |  | $ 19.3 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax | [1],[2] |  |  |  |  |  |  |  |
Net Cash Provided by (Used in) Discontinued Operations |  |  | 105.5 us-gaap_NetCashProvidedByUsedInDiscontinuedOperations |  | 202.1 us-gaap_NetCashProvidedByUsedInDiscontinuedOperations | 290.8 us-gaap_NetCashProvidedByUsedInDiscontinuedOperations | 311.1 us-gaap_NetCashProvidedByUsedInDiscontinuedOperations | [2] |  |  |  |  |  |  |  |
Litigation Settlement, Amount |  |  | 9.6 us-gaap_LitigationSettlementAmount |  |  |  |  |  |  |  |  |  |  |  |  |
Legal Fees |  |  | 3.6 us-gaap_LegalFees |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Litigation Liability |  |  | 6.4 us-gaap_LitigationReserve |  |  |  | 6.4 us-gaap_LitigationReserve |  |  |  |  |  |  |  | 6.4 us-gaap_LitigationReserve |
Liability insurance self-insured retention per occurrence |  |  | 10.0 esv_LiabilityInsuranceSelfInsuredRetentionPerOccurrence |  |  |  | 10.0 esv_LiabilityInsuranceSelfInsuredRetentionPerOccurrence |  |  |  |  |  |  |  | 10.0 esv_LiabilityInsuranceSelfInsuredRetentionPerOccurrence |
Litigation Settlement, Amount to be Paid by Underwriters |  |  | 3.2 esv_LitigationSettlementAmounttobePaidbyUnderwriters |  |  |  | 3.2 esv_LitigationSettlementAmounttobePaidbyUnderwriters |  |  |  |  |  |  |  | 3.2 esv_LitigationSettlementAmounttobePaidbyUnderwriters |
Pride Pennsylvania Rig [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge for asset write down |  |  |  |  |  | (2.5)us-gaap_DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = esv_PridePennsylvaniaRigMember |  |  |  |  |  |  |  |  |  |
Jackups [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Rigs Committed To Be Sold |  |  | 2 esv_NumberOfRigsCommittedToBeSold / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember |  |  |  |  |  |  |  |  |  |  |  |  |
Jackups [Member] | ENSCO 69 And Wisconsin [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax Gain/(Loss) |  |  |  |  |  |  |  |  | 23.6 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = esv_ENSCO69AndWisconsinMember / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember |  |  |  |  |  |  |
Net Cash Provided by (Used in) Discontinued Operations |  |  |  |  |  |  |  |  | 32.2 us-gaap_NetCashProvidedByUsedInDiscontinuedOperations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = esv_ENSCO69AndWisconsinMember / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember | [2] |  |  |  |  |  |
Jackups [Member] | ENSCO 93 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax Gain/(Loss) |  |  | 1.2 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = esv_ENSCO93Member / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember |  |  |  |  |  |  |  | (1.2)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = esv_ENSCO93Member / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember |  |  |  |  |
Net Cash Provided by (Used in) Discontinued Operations |  |  | 51.7 us-gaap_NetCashProvidedByUsedInDiscontinuedOperations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = esv_ENSCO93Member / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember | [2] |  |  |  |  |  |  | 51.7 us-gaap_NetCashProvidedByUsedInDiscontinuedOperations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = esv_ENSCO93Member / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember | [2] |  |  |  |
Jackups [Member] | ENSCO 85 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax Gain/(Loss) | 10.3 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = esv_ENSCO85Member / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Cash Provided by (Used in) Discontinued Operations | 64.4 us-gaap_NetCashProvidedByUsedInDiscontinuedOperations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = esv_ENSCO85Member / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Jackups [Member] | Pride Pennsylvania Rig [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  | (0.2)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = esv_PridePennsylvaniaRigMember / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember |  |  |
Net Cash Provided by (Used in) Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  | 15.5 us-gaap_NetCashProvidedByUsedInDiscontinuedOperations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = esv_PridePennsylvaniaRigMember / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember | [2] |  |
Floaters [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Rigs Committed To Be Sold |  |  | 6 esv_NumberOfRigsCommittedToBeSold / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember |  |  |  |  |  |  |  |  |  |  |  | 5 esv_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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax Gain/(Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.8 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = esv_ENSCO5000Member / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember |
Net Cash Provided by (Used in) Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.3 us-gaap_NetCashProvidedByUsedInDiscontinuedOperations / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = esv_ENSCO5000Member / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember | [2]
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets to be Disposed of, Tax Benefit |  |  | $ 83.5 esv_ImpairmentofLongLivedAssetstobeDisposedofTaxBenefit / us-gaap_IncomeStatementLocationAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | In September 2014, we sold jackup rigs ENSCO 83, ENSCO 89, ENSCO 93 and ENSCO 98, all of which are contracted to Pemex. As described below, the loss on sale and operating results of ENSCO 93 were included in (loss) income from discontinued operations, net in our consolidated statement of operations for the three-year period ended December 31, 2014.
[2] | The rigs' operating results were reclassified to discontinued operations in our consolidated statements of operations for each of the years in the three-year period ended December 31, 2014 and were previously included within the operating segment noted in the above table.

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- Definition The loss (gain) resulting from the write-down of the carrying value of assets classified as a disposal group, but one which is not further classified as a discontinued operation, to fair value less cost to sell. A (gain) results from a subsequent increase in fair value less cost to sell, but not in excess of the cumulative loss previously recognized. For example, the write-down of a disposal group subject to a plan of sale, which was not sold in the current period, to its held-for-sale value. The loss (gain) is included in income from continuing operations before income taxes in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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