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 511600000 511.6 false false 2 true true 609400000 609.4 false false 3 true true 1020900000 1020.9 false false 4 true true 1169300000 1169.3 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 177800000 177.8 false false 2 false true 203000000 203.0 false false 3 false true 341500000 341.5 false false 4 false true 381600000 381.6 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 49300000 49.3 false false 2 false true 46700000 46.7 false false 3 false true 96500000 96.5 false false 4 false true 92400000 92.4 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 16000000 16.0 false false 2 false true 13800000 13.8 false false 3 false true 28000000 28.0 false false 4 false true 26500000 26.5 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 243100000 243.1 false false 2 false true 263500000 263.5 false false 3 false true 466000000 466.0 false false 4 false true 500500000 500.5 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 268500000 268.5 false false 2 false true 345900000 345.9 false false 3 false true 554900000 554.9 false false 4 false true 668800000 668.8 false false No definition available. No authoritative reference available. false 21 Other income, 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 6900000 6.9 false false 2 false true 6800000 6.8 false false 3 false true 2600000 2.6 false false 4 false true 11300000 11.3 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 275400000 275.4 false false 2 false true 352700000 352.7 false false 3 false true 557500000 557.5 false false 4 false true 680100000 680.1 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 38100000 38.1 false false 2 false true 63500000 63.5 false false 3 false true 87600000 87.6 false false 4 false true 116800000 116.8 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 11000000 11.0 false false 2 false true 1100000 1.1 false false 3 false true 17800000 17.8 false false 4 false true 6400000 6.4 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 49100000 49.1 false false 2 false true 64600000 64.6 false false 3 false true 105400000 105.4 false false 4 false true 123200000 123.2 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 226300000 226.3 false false 2 false true 288100000 288.1 false false 3 false true 452100000 452.1 false false 4 false true 556900000 556.9 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 (Loss) income 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 -13100000 -13.1 false false 2 false true 9800000 9.8 false false 3 false true -16800000 -16.8 false false 4 false true 14700000 14.7 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 -11800000 -11.8 false false 2 false true 0 0 false false 3 false true -11800000 -11.8 false false 4 false true 0 0 false false No definition available. No authoritative reference available. true 31 Total (loss) income from discontinued operations, net 10 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -24900000 -24.9 false false 2 false true 9800000 9.8 false false 3 false true -28600000 -28.6 false false 4 false true 14700000 14.7 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 201400000 201.4 false false 2 false true 297900000 297.9 false false 3 false true 423500000 423.5 false false 4 false true 571600000 571.6 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 -1200000 -1.2 false false 3 false true -2500000 -2.5 false false 4 false true -2900000 -2.9 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 200300000 200.3 false false 2 false true 296700000 296.7 false false 3 false true 421000000 421.0 false false 4 false true 568700000 568.7 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 1.59 1.59 false false 2 true true 1.99 1.99 false false 3 true true 3.17 3.17 false false 4 true true 3.85 3.85 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 -0.18 -0.18 false false 2 true true 0.07 0.07 false false 3 true true -0.2 -0.2 false false 4 true true 0.1 0.1 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 1.41 1.41 false false 2 true true 2.06 2.06 false false 3 true true 2.97 2.97 false false 4 true true 3.95 3.95 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 1.59 1.59 false false 2 true true 1.98 1.98 false false 3 true true 3.17 3.17 false false 4 true true 3.83 3.83 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 -0.18 -0.18 false false 2 true true 0.07 0.07 false false 3 true true -0.2 -0.2 false false 4 true true 0.1 0.1 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 1.41 1.41 false false 2 true true 2.05 2.05 false false 3 true true 2.97 2.97 false false 4 true true 3.93 3.93 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 197900000 197.9 false false 2 false true 293500000 293.5 false false 3 false true 415900000 415.9 false false 4 false true 563300000 563.3 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 197900000 197.9 false false 2 true true 293500000 293.5 false false 3 true true 415900000 415.9 false false 4 true true 563300000 563.3 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 140300000 140.3 false false 2 false true 142700000 142.7 false false 3 false true 140200000 140.2 false false 4 false true 142700000 142.7 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 140400000 140.4 false false 2 false true 143200000 143.2 false false 3 false true 140200000 140.2 false false 4 false true 143200000 143.2 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 0.05 0.05 false false 4 false true 0.05 0.05 false false No definition available. No authoritative reference available. false false 4 36 false HundredThousands HundredThousands NoRounding false true