1.0.0.3 false Condensed Consolidated Statements of Income (USD $) In Millions, except Per Share data false 1 $ false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 Unit1 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 false 2 $ false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 Unit1 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 false 3 $ false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 Unit1 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 false 4 $ false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 Unit1 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 5 Operating revenues 3 us-gaap_RevenueOilAndGasServices us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 true true 425400000 425.4 false false 2 true true 619500000 619.5 false false 3 true true 1446300000 1446.3 false false 4 true true 1788800000 1788.8 false false No definition available. No authoritative reference available. false 15 Operating Expenses 12 us-gaap_OperatingExpensesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false 4 false false 0 0 false false No definition available. false 16 Contract drilling (exclusive of depreciation) 13 us-gaap_ContractRevenueCost us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 183300000 183.3 false false 2 false true 185200000 185.2 false false 3 false true 524800000 524.8 false false 4 false true 566800000 566.8 false false No definition available. No authoritative reference available. false 17 Depreciation expense 13 us-gaap_CostOfServicesDepreciation us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 53300000 53.3 false false 2 false true 47000000 47.0 false false 3 false true 149800000 149.8 false false 4 false true 139400000 139.4 false false No definition available. No authoritative reference available. false 18 General and administrative 13 us-gaap_GeneralAndAdministrativeExpense us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 13600000 13.6 false false 2 false true 15200000 15.2 false false 3 false true 41600000 41.6 false false 4 false true 41700000 41.7 false false No definition available. No authoritative reference available. true 19 Total operating expenses 12 us-gaap_CostsAndExpenses us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 250200000 250.2 false false 2 false true 247400000 247.4 false false 3 false true 716200000 716.2 false false 4 false true 747900000 747.9 false false No definition available. No authoritative reference available. true 20 Operating income 11 us-gaap_OperatingIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 175200000 175.2 false false 2 false true 372100000 372.1 false false 3 false true 730100000 730.1 false false 4 false true 1040900000 1040.9 false false No definition available. No authoritative reference available. false 21 Other income (expense), net 10 us-gaap_NonoperatingIncomeExpense us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 3600000 3.6 false false 2 false true -6500000 -6.5 false false 3 false true 6200000 6.2 false false 4 false true 4800000 4.8 false false No definition available. No authoritative reference available. true 22 Income from continuing operations before income taxes 10 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 178800000 178.8 false false 2 false true 365600000 365.6 false false 3 false true 736300000 736.3 false false 4 false true 1045700000 1045.7 false false No definition available. No authoritative reference available. false 23 Provision For Income Taxes 9 us-gaap_IncomeTaxExpenseBenefitAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false 4 false false 0 0 false false No definition available. false 24 Current income tax expense 10 us-gaap_CurrentIncomeTaxExpenseBenefit us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 17300000 17.3 false false 2 false true 59100000 59.1 false false 3 false true 104900000 104.9 false false 4 false true 175900000 175.9 false false No definition available. No authoritative reference available. false 25 Deferred income tax expense 10 us-gaap_DeferredIncomeTaxExpenseBenefit us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 11100000 11.1 false false 2 false true 9700000 9.7 false false 3 false true 28900000 28.9 false false 4 false true 16100000 16.1 false false No definition available. No authoritative reference available. true 26 Total provision for income taxes 10 us-gaap_IncomeTaxExpenseBenefit us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 28400000 28.4 false false 2 false true 68800000 68.8 false false 3 false true 133800000 133.8 false false 4 false true 192000000 192.0 false false No definition available. No authoritative reference available. true 27 Income from continuing operations 9 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 150400000 150.4 false false 2 false true 296800000 296.8 false false 3 false true 602500000 602.5 false false 4 false true 853700000 853.7 false false No definition available. No authoritative reference available. false 28 Discontinued Operations 8 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false 4 false false 0 0 false false No definition available. false 29 Income (loss) from discontinued operations, net 9 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 400000 0.4 false false 2 false true 10400000 10.4 false false 3 false true -16400000 -16.4 false false 4 false true 25100000 25.1 false false No definition available. No authoritative reference available. false 30 Loss on disposal of discontinued operations, net 9 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true -23500000 -23.5 false false 3 false true -11800000 -11.8 false false 4 false true -23500000 -23.5 false false No definition available. No authoritative reference available. true 31 Total income (loss) from discontinued operations, net 9 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 400000 0.4 false false 2 false true -13100000 -13.1 false false 3 false true -28200000 -28.2 false false 4 false true 1600000 1.6 false false No definition available. No authoritative reference available. true 32 Net income 6 us-gaap_ProfitLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 150800000 150.8 false false 2 false true 283700000 283.7 false false 3 false true 574300000 574.3 false false 4 false true 855300000 855.3 false false No definition available. No authoritative reference available. false 33 Less: Net income attributable to noncontrolling interests 5 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -1100000 -1.1 false false 2 false true -1400000 -1.4 false false 3 false true -3600000 -3.6 false false 4 false true -4300000 -4.3 false false No definition available. No authoritative reference available. true 34 Net income attributable to Ensco 5 us-gaap_NetIncomeLoss us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 149700000 149.7 false false 2 false true 282300000 282.3 false false 3 false true 570700000 570.7 false false 4 false true 851000000 851.0 false false No definition available. No authoritative reference available. true 36 Earnings (Loss) Per Common Share - Basic 4 us-gaap_EarningsPerShareBasicAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false 4 false false 0 0 false false No definition available. false 37 Continuing operations 5 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 1.05 1.05 false false 2 true true 2.07 2.07 false false 3 true true 4.22 4.22 false false 4 true true 5.91 5.91 false false No definition available. No authoritative reference available. false 38 Discontinued operations 5 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 0 0 false false 2 true true -0.09 -0.09 false false 3 true true -0.2 -0.2 false false 4 true true 0.01 0.01 false false No definition available. No authoritative reference available. true 39 Total earnings (loss) per common share - basic 5 us-gaap_EarningsPerShareBasic us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 1.05 1.05 false false 2 true true 1.98 1.98 false false 3 true true 4.02 4.02 false false 4 true true 5.92 5.92 false false No definition available. No authoritative reference available. true 40 Earnings (Loss) Per Common Share - Diluted 4 us-gaap_EarningsPerShareDilutedAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false 4 false false 0 0 false false No definition available. false 41 Continuing operations 5 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 1.05 1.05 false false 2 true true 2.06 2.06 false false 3 true true 4.21 4.21 false false 4 true true 5.9 5.9 false false No definition available. No authoritative reference available. false 42 Discontinued operations 5 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 0 0 false false 2 true true -0.09 -0.09 false false 3 true true -0.2 -0.2 false false 4 true true 0.01 0.01 false false No definition available. No authoritative reference available. true 43 Total earnings (loss) per common share - diluted 5 us-gaap_EarningsPerShareDiluted us-gaap true na duration decimal No definition available. false false false false false false false false true 1 true true 1.05 1.05 false false 2 true true 1.97 1.97 false false 3 true true 4.01 4.01 false false 4 true true 5.91 5.91 false false No definition available. No authoritative reference available. true 44 Net Income Attributable To Ensco Common Shares 3 esv_NetIncomeLossAttributableToParentCommonShares esv false na duration string Net Income Loss Attributable To Parent Common Shares [Abstract] false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false 4 false false 0 0 false false Net Income Loss Attributable To Parent Common Shares [Abstract] false 45 Basic 4 esv_NetIncomeLossAttributableToCommonStockholdersBasic esv false credit duration monetary Net income (loss) attributable to parent after adjustments for distributed and undistributed earnings on participating... false false false false false false false false false 1 false true 147800000 147.8 false false 2 false true 278800000 278.8 false false 3 false true 563700000 563.7 false false 4 false true 842100000 842.1 false false Net income (loss) attributable to parent after adjustments for distributed and undistributed earnings on participating securities, basic. No authoritative reference available. false 46 Diluted 4 esv_NetIncomeLossAttributableToCommonStockholdersDiluted esv false credit duration monetary Net income (loss) attributable to parent after adjustments for distributed and undistributed earnings on participating... false false false false false false false false false 1 true true 147800000 147.8 false false 2 true true 278800000 278.8 false false 3 true true 563700000 563.7 false false 4 true true 842100000 842.1 false false Net income (loss) attributable to parent after adjustments for distributed and undistributed earnings on participating securities, diluted. No authoritative reference available. false 47 Weighted-Average Common Shares Outstanding 3 esv_WeightedAverageCommonSharesOutstanding esv false na duration string Weighted-Average Common Shares Outstanding [Abstract] false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false 4 false false 0 0 false false Weighted-Average Common Shares Outstanding [Abstract] false 48 Basic 4 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic us-gaap true na duration shares No definition available. false false false false false false false false false 1 false true 140700000 140.7 false false 2 false true 141100000 141.1 false false 3 false true 140300000 140.3 false false 4 false true 142200000 142.2 false false No definition available. No authoritative reference available. false 49 Diluted 4 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding us-gaap true na duration shares No definition available. false false false false false false false false false 1 false true 140700000 140.7 false false 2 false true 141400000 141.4 false false 3 false true 140400000 140.4 false false 4 false true 142600000 142.6 false false No definition available. No authoritative reference available. false 50 Cash dividends per common share 3 us-gaap_CommonStockDividendsPerShareCashPaid us-gaap true na duration decimal No definition available. false false false false false false false false false 1 false true 0.025 0.025 false false 2 false true 0.025 0.025 false false 3 false true 0.075 0.075 false false 4 false true 0.075 0.075 false false No definition available. No authoritative reference available. false false 4 36 false HundredThousands HundredThousands NoRounding false true