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Consolidated Statements Of Income (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
OPERATING REVENUES	$ 4,564.5us-gaap_RevenueOilAndGasServices	$ 4,323.4us-gaap_RevenueOilAndGasServices	$ 3,638.8us-gaap_RevenueOilAndGasServices
OPERATING EXPENSES
Contract drilling (exclusive of depreciation)	2,076.9us-gaap_CostOfServicesOilAndGas	1,947.1us-gaap_CostOfServicesOilAndGas	1,642.8us-gaap_CostOfServicesOilAndGas
Asset Impairment Charges	4,218.7us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges
Depreciation	537.9us-gaap_CostOfServicesDepreciation	496.2us-gaap_CostOfServicesDepreciation	443.8us-gaap_CostOfServicesDepreciation
General and administrative	131.9us-gaap_GeneralAndAdministrativeExpense	146.8us-gaap_GeneralAndAdministrativeExpense	148.9us-gaap_GeneralAndAdministrativeExpense
Total operating expenses	6,965.4us-gaap_CostsAndExpenses	2,590.1us-gaap_CostsAndExpenses	2,235.5us-gaap_CostsAndExpenses
OPERATING INCOME	(2,400.9)us-gaap_OperatingIncomeLoss	1,733.3us-gaap_OperatingIncomeLoss	1,403.3us-gaap_OperatingIncomeLoss
OTHER INCOME (EXPENSE)
Interest income	13.0us-gaap_OtherInterestAndDividendIncome	16.6us-gaap_OtherInterestAndDividendIncome	22.8us-gaap_OtherInterestAndDividendIncome
Interest expense, net	(161.4)us-gaap_InterestExpense	(158.8)us-gaap_InterestExpense	(123.6)us-gaap_InterestExpense
Other, net	0.5us-gaap_OtherNonoperatingIncomeExpense	42.1us-gaap_OtherNonoperatingIncomeExpense	2.2us-gaap_OtherNonoperatingIncomeExpense
Other income (expense), net	(147.9)us-gaap_NonoperatingIncomeExpense	(100.1)us-gaap_NonoperatingIncomeExpense	(98.6)us-gaap_NonoperatingIncomeExpense
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(2,548.8)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1,633.2us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1,304.7us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
PROVISION FOR INCOME TAXES
Current income tax expense	264.0us-gaap_CurrentIncomeTaxExpenseBenefit	193.0us-gaap_CurrentIncomeTaxExpenseBenefit	200.8us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax expense (benefit)	(123.5)us-gaap_DeferredIncomeTaxExpenseBenefit	10.1us-gaap_DeferredIncomeTaxExpenseBenefit	27.8us-gaap_DeferredIncomeTaxExpenseBenefit
Total provision for income taxes	140.5us-gaap_IncomeTaxExpenseBenefit	203.1us-gaap_IncomeTaxExpenseBenefit	228.6us-gaap_IncomeTaxExpenseBenefit
INCOME FROM CONTINUING OPERATIONS	(2,689.3)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	1,430.1us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	1,076.1us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
DISCONTINUED OPERATIONS, NET	(1,199.2)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	(2.2)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	100.6us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
NET INCOME	(3,888.5)us-gaap_ProfitLoss	1,427.9us-gaap_ProfitLoss	1,176.7us-gaap_ProfitLoss
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(14.1)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	(9.7)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	(7.0)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
NET INCOME ATTRIBUTABLE TO ENSCO	(3,902.6)us-gaap_NetIncomeLoss	1,418.2us-gaap_NetIncomeLoss	1,169.7us-gaap_NetIncomeLoss
EARNINGS PER SHARE - BASIC
Continuing operations	$ (11.70)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 6.09us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 4.62us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Discontinued operations	$ (5.18)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	$ 0.43us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Total earnings per share - basic	$ (16.88)us-gaap_EarningsPerShareBasic	$ 6.08us-gaap_EarningsPerShareBasic	$ 5.05us-gaap_EarningsPerShareBasic
EARNINGS PER SHARE - DILUTED
Continuing operations	$ (11.70)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 6.08us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 4.61us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Discontinued operations	$ (5.18)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	$ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	$ 0.43us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Total earnings per share - diluted	$ (16.88)us-gaap_EarningsPerShareDiluted	$ 6.07us-gaap_EarningsPerShareDiluted	$ 5.04us-gaap_EarningsPerShareDiluted
NET INCOME ATTRIBUTABLE TO ENSCO SHARES - BASIC AND DILUTED	$ (3,910.5)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted	$ 1,403.1us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted	$ 1,157.4us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
WEIGHTED-AVERAGE SHARES OUTSTANDING
Basic	231.6us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	230.9us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	229.4us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted	231.6us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	231.1us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	229.7us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
CASH DIVIDENDS PER SHARE	$ 3.0us-gaap_CommonStockDividendsPerShareCashPaid	$ 2.25us-gaap_CommonStockDividendsPerShareCashPaid	$ 1.50us-gaap_CommonStockDividendsPerShareCashPaid

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