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Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
NET INCOME	$ (3,448.5)us-gaap_ProfitLoss	$ 432.9us-gaap_ProfitLoss	$ (1,169.6)us-gaap_ProfitLoss	$ 296.7us-gaap_ProfitLoss	$ 364.0us-gaap_ProfitLoss	$ 381.4us-gaap_ProfitLoss	$ 362.6us-gaap_ProfitLoss	$ 319.9us-gaap_ProfitLoss	$ (3,888.5)us-gaap_ProfitLoss	$ 1,427.9us-gaap_ProfitLoss	$ 1,176.7us-gaap_ProfitLoss
OTHER COMPREHENSIVE INCOME (LOSS), NET
Net change in fair value of derivatives									(11.7)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	(5.8)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	8.7us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Reclassification of gains and losses on derivative instruments from other comprehensive (income) loss into net income									(0.9)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	2.0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Other									6.3esv_AccumulatedOtherComprehensiveIncomeGainsAndLossesOnDerivativeInstrumentsOther	1.9esv_AccumulatedOtherComprehensiveIncomeGainsAndLossesOnDerivativeInstrumentsOther	2.8esv_AccumulatedOtherComprehensiveIncomeGainsAndLossesOnDerivativeInstrumentsOther
NET OTHER COMPREHENSIVE INCOME (LOSS)									(6.3)us-gaap_OtherComprehensiveIncomeLossNetOfTax	(1.9)us-gaap_OtherComprehensiveIncomeLossNetOfTax	11.5us-gaap_OtherComprehensiveIncomeLossNetOfTax
COMPREHENSIVE INCOME									(3,894.8)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	1,426.0us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	1,188.2us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									(14.1)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	(9.7)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	(7.0)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO									$ (3,908.9)us-gaap_ComprehensiveIncomeNetOfTax	$ 1,416.3us-gaap_ComprehensiveIncomeNetOfTax	$ 1,181.2us-gaap_ComprehensiveIncomeNetOfTax

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