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Guarantee Of Registered Securities Guarantee Of Registered Securities (Condensed Consolidating Statements of Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
NET INCOME	$ 327.9us-gaap_ProfitLoss	$ 296.7us-gaap_ProfitLoss
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in fair value of derivatives	(17.4)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	4.9us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Reclassification of net (gains) losses 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
Ensco Plc [Member]
NET INCOME	324.7us-gaap_ProfitLoss / dei_LegalEntityAxis = esv_EnscoPlcMember	292.5us-gaap_ProfitLoss / dei_LegalEntityAxis = esv_EnscoPlcMember
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in fair value of derivatives	0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = esv_EnscoPlcMember	0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = esv_EnscoPlcMember
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / dei_LegalEntityAxis = esv_EnscoPlcMember	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / dei_LegalEntityAxis = esv_EnscoPlcMember
NET OTHER COMPREHENSIVE (LOSS) INCOME	0us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = esv_EnscoPlcMember	0us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = esv_EnscoPlcMember
COMPREHENSIVE INCOME	324.7us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = esv_EnscoPlcMember	292.5us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = esv_EnscoPlcMember
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = esv_EnscoPlcMember	0us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = esv_EnscoPlcMember
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	324.7us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = esv_EnscoPlcMember	292.5us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = esv_EnscoPlcMember
ENSCO International Inc. [Member]
NET INCOME	12.0us-gaap_ProfitLoss / dei_LegalEntityAxis = esv_EnscoInternationalIncMember	57.6us-gaap_ProfitLoss / dei_LegalEntityAxis = esv_EnscoInternationalIncMember
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in fair value of derivatives	(17.4)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = esv_EnscoInternationalIncMember	4.9us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = esv_EnscoInternationalIncMember
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	5.0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / dei_LegalEntityAxis = esv_EnscoInternationalIncMember	0.5us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / dei_LegalEntityAxis = esv_EnscoInternationalIncMember
NET OTHER COMPREHENSIVE (LOSS) INCOME	(12.4)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = esv_EnscoInternationalIncMember	5.4us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = esv_EnscoInternationalIncMember
COMPREHENSIVE INCOME	(0.4)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = esv_EnscoInternationalIncMember	63.0us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = esv_EnscoInternationalIncMember
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = esv_EnscoInternationalIncMember	0us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = esv_EnscoInternationalIncMember
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	(0.4)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = esv_EnscoInternationalIncMember	63.0us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = esv_EnscoInternationalIncMember
Pride International, Inc. [Member]
NET INCOME	48.0us-gaap_ProfitLoss / dei_LegalEntityAxis = esv_PrideInternationalIncMember	(27.5)us-gaap_ProfitLoss / dei_LegalEntityAxis = esv_PrideInternationalIncMember
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in fair value of derivatives	0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = esv_PrideInternationalIncMember	0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = esv_PrideInternationalIncMember
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / dei_LegalEntityAxis = esv_PrideInternationalIncMember	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / dei_LegalEntityAxis = esv_PrideInternationalIncMember
NET OTHER COMPREHENSIVE (LOSS) INCOME	0us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = esv_PrideInternationalIncMember	0us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = esv_PrideInternationalIncMember
COMPREHENSIVE INCOME	48.0us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = esv_PrideInternationalIncMember	(27.5)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = esv_PrideInternationalIncMember
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = esv_PrideInternationalIncMember	0us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = esv_PrideInternationalIncMember
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	48.0us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = esv_PrideInternationalIncMember	(27.5)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = esv_PrideInternationalIncMember
Other Non-Guarantor Subsidiaries Of Ensco [Member]
NET INCOME	448.4us-gaap_ProfitLoss / dei_LegalEntityAxis = esv_OtherNonGuarantorSubsidiariesMember	377.9us-gaap_ProfitLoss / dei_LegalEntityAxis = esv_OtherNonGuarantorSubsidiariesMember
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in fair value of derivatives	0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = esv_OtherNonGuarantorSubsidiariesMember	0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = esv_OtherNonGuarantorSubsidiariesMember
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / dei_LegalEntityAxis = esv_OtherNonGuarantorSubsidiariesMember	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / dei_LegalEntityAxis = esv_OtherNonGuarantorSubsidiariesMember
Other	2.6esv_AccumulatedOtherComprehensiveIncomeGainsAndLossesOnDerivativeInstrumentsOther / dei_LegalEntityAxis = esv_OtherNonGuarantorSubsidiariesMember
NET OTHER COMPREHENSIVE (LOSS) INCOME	2.6us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = esv_OtherNonGuarantorSubsidiariesMember	0us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = esv_OtherNonGuarantorSubsidiariesMember
COMPREHENSIVE INCOME	451.0us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = esv_OtherNonGuarantorSubsidiariesMember	377.9us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = esv_OtherNonGuarantorSubsidiariesMember
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(3.2)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = esv_OtherNonGuarantorSubsidiariesMember	(4.2)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = esv_OtherNonGuarantorSubsidiariesMember
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	447.8us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = esv_OtherNonGuarantorSubsidiariesMember	373.7us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = esv_OtherNonGuarantorSubsidiariesMember
Consolidating Adjustments [Member]
NET INCOME	(505.2)us-gaap_ProfitLoss / dei_LegalEntityAxis = esv_ConsolidatedAdjustmentsMember	(403.8)us-gaap_ProfitLoss / dei_LegalEntityAxis = esv_ConsolidatedAdjustmentsMember
OTHER COMPREHENSIVE INCOME (LOSS), NET:
Net change in fair value of derivatives	0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = esv_ConsolidatedAdjustmentsMember	0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = esv_ConsolidatedAdjustmentsMember
Reclassification of net (gains) losses on derivative instruments from other comprehensive income into net income	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / dei_LegalEntityAxis = esv_ConsolidatedAdjustmentsMember	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / dei_LegalEntityAxis = esv_ConsolidatedAdjustmentsMember
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COMPREHENSIVE INCOME	(505.2)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = esv_ConsolidatedAdjustmentsMember	(403.8)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = esv_ConsolidatedAdjustmentsMember
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = esv_ConsolidatedAdjustmentsMember	0us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = esv_ConsolidatedAdjustmentsMember
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	$ (505.2)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = esv_ConsolidatedAdjustmentsMember	$ (403.8)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = esv_ConsolidatedAdjustmentsMember

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