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Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 327.9us-gaap_ProfitLoss	$ 296.7us-gaap_ProfitLoss
OTHER COMPREHENSIVE (LOSS) INCOME, NET
Net change in fair value of derivatives	(17.4)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	4.9us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Reclassification of net losses (gains) on derivative instruments from other comprehensive income into net income	5.0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	0.5us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Other	2.6esv_AccumulatedOtherComprehensiveIncomeGainsAndLossesOnDerivativeInstrumentsOther	0esv_AccumulatedOtherComprehensiveIncomeGainsAndLossesOnDerivativeInstrumentsOther
NET OTHER COMPREHENSIVE (LOSS) INCOME	(9.8)us-gaap_OtherComprehensiveIncomeLossNetOfTax	5.4us-gaap_OtherComprehensiveIncomeLossNetOfTax
COMPREHENSIVE INCOME	318.1us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	302.1us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(3.2)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	(4.2)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	$ 314.9us-gaap_ComprehensiveIncomeNetOfTax	$ 297.9us-gaap_ComprehensiveIncomeNetOfTax

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