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Condensed Consolidated Statements Of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
OPERATING REVENUES	$ 1,163.9us-gaap_RevenueOilAndGasServices	$ 1,066.7us-gaap_RevenueOilAndGasServices
OPERATING EXPENSES
Contract drilling (exclusive of depreciation)	518.3us-gaap_CostOfServicesOilAndGas	520.2us-gaap_CostOfServicesOilAndGas
Depreciation	137.1us-gaap_CostOfServicesDepreciation	131.1us-gaap_CostOfServicesDepreciation
General and administrative	30.1us-gaap_GeneralAndAdministrativeExpense	38.1us-gaap_GeneralAndAdministrativeExpense
Total operating expenses	685.5us-gaap_CostsAndExpenses	689.4us-gaap_CostsAndExpenses
OPERATING (LOSS) INCOME	478.4us-gaap_OperatingIncomeLoss	377.3us-gaap_OperatingIncomeLoss
OTHER INCOME (EXPENSE)
Interest income	2.4us-gaap_OtherInterestAndDividendIncome	3.6us-gaap_OtherInterestAndDividendIncome
Interest expense, net	(52.4)us-gaap_InterestExpenseOther	(34.6)us-gaap_InterestExpenseOther
Other, net	(22.6)us-gaap_OtherNonoperatingIncomeExpense	1.9us-gaap_OtherNonoperatingIncomeExpense
Other income (expense), net	(72.6)us-gaap_NonoperatingIncomeExpense	(29.1)us-gaap_NonoperatingIncomeExpense
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	405.8us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	348.2us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
PROVISION FOR INCOME TAXES
Current income tax expense	62.7us-gaap_CurrentIncomeTaxExpenseBenefit	55.2us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax expense (benefit)	15.0us-gaap_DeferredIncomeTaxExpenseBenefit	(5.7)us-gaap_DeferredIncomeTaxExpenseBenefit
Total provision for income taxes	77.7us-gaap_IncomeTaxExpenseBenefit	49.5us-gaap_IncomeTaxExpenseBenefit
INCOME FROM CONTINUING OPERATIONS	328.1us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	298.7us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
DISCONTINUED OPERATIONS, NET	(0.2)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	(2.0)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
NET INCOME	327.9us-gaap_ProfitLoss	296.7us-gaap_ProfitLoss
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(3.2)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	(4.2)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
NET INCOME ATTRIBUTABLE TO ENSCO	324.7us-gaap_NetIncomeLoss	292.5us-gaap_NetIncomeLoss
EARNINGS (LOSS) PER SHARE - BASIC AND DILUTED
Income (Loss) from Continuing Operations, Per Basic and Diluted Share	$ 1.38us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare	$ 1.26us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic and Diluted Share	$ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare	$ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare
Earnings Per Share, Basic and Diluted	$ 1.38us-gaap_EarningsPerShareBasicAndDiluted	$ 1.25us-gaap_EarningsPerShareBasicAndDiluted
NET INCOME ATTRIBUTABLE TO ENSCO SHARES - BASIC AND DILUTED	$ 321.0esv_NetIncomeLossAvailabletoCommonStockholdersBasicandDiluted	$ 289.5esv_NetIncomeLossAvailabletoCommonStockholdersBasicandDiluted
WEIGHTED-AVERAGE SHARES OUTSTANDING
Basic (in shares)	231.9us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	231.3us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares)	231.9us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	231.4us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
CASH DIVIDENDS PER SHARE (in dollars per share)	$ 0.150us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.750us-gaap_CommonStockDividendsPerShareCashPaid

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The net result for the period of deducting operating expenses from operating revenues.

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Includes all other interest income, net of discount accretion and premium amortization, and dividend income. It may include dividend income from equity securities that do not have readily determinable fair values that are reportable in Other Assets, and interest income on interest-only strips receivable (not in the form of a security) that are included in Other Assets.

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The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Revenue from oil and gas-related services including well services (such as drilling, rigs and analytic evaluations), transportation, and other supporting contractor services, during the reporting period.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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