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Goodwill and Other Intangible Assets and Liabilities (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 16, 2014	Sep. 30, 2014	May 31, 2014	Dec. 31, 2012
Goodwill [Line Items]
Asset Impairment Charges, Assumptions Used, Weighted Average Capital Cost	11.00%esv_AssetImpairmentChargesAssumptionsUsedWeightedAverageCapitalCost
Goodwill, Gross					$ 3,100.0us-gaap_GoodwillGross
Price Per Barrel	55esv_PricePerBarrel			95esv_PricePerBarrel
Goodwill	276.1us-gaap_Goodwill	3,274.0us-gaap_Goodwill
Drilling contract intangible assets, Gross Carrying Amount	209.0us-gaap_FiniteLivedIntangibleAssetsGross	209.0us-gaap_FiniteLivedIntangibleAssetsGross				209.0us-gaap_FiniteLivedIntangibleAssetsGross
Intangible Assets, Accumulated Amortization [Roll Forward]
Balance, beginning of period	(130.6)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	(88.3)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Amortization	(32.7)us-gaap_AmortizationOfIntangibleAssets	(42.3)us-gaap_AmortizationOfIntangibleAssets
Balance, end of period	(163.3)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	(130.6)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible Assets, Net Carrying Amount [Roll Forward]
Balance, beginning of period	78.4us-gaap_IntangibleAssetsNetExcludingGoodwill	120.7us-gaap_IntangibleAssetsNetExcludingGoodwill
Amortization	(32.7)us-gaap_AmortizationOfIntangibleAssets	(42.3)us-gaap_AmortizationOfIntangibleAssets
Balance, end of period	45.7us-gaap_IntangibleAssetsNetExcludingGoodwill	78.4us-gaap_IntangibleAssetsNetExcludingGoodwill
Drilling contract intangible liabilities, Gross Carrying Amount	278.0esv_FiniteLivedIntangibleLiabilitiesGross	278.0esv_FiniteLivedIntangibleLiabilitiesGross				278.0esv_FiniteLivedIntangibleLiabilitiesGross
Intangible Liabilities, Accumulated Amortization [Roll Forward]
Balance, beginning of period	(208.9)esv_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization	(160.0)esv_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization
Amortization	(28.4)esv_AmortizationIncome	(48.9)esv_AmortizationIncome
Balance, end of period	(237.3)esv_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization	(208.9)esv_FiniteLivedIntangibleLiabilitiesAccumulatedAmortization
Intangible Liabilities, Net Carrying Amount [Roll Forward]
Balance, beginning of period	69.1esv_IntangibleLiabilitiesNetExcludingGoodwill	118.0esv_IntangibleLiabilitiesNetExcludingGoodwill
Amortization	(28.4)esv_AmortizationIncome	(48.9)esv_AmortizationIncome
Balance, end of period	40.7esv_IntangibleLiabilitiesNetExcludingGoodwill	69.1esv_IntangibleLiabilitiesNetExcludingGoodwill
Finite-Lived Intangible Assets, Net, Amortization Income (Expense), Fiscal Year Maturity [Abstract]
2014	(4.5)esv_FiniteLivedIntangibleAssetsExpenseIncomeNetNextTwelveMonths
2015	(0.8)esv_FiniteLivedIntangibleAssetsExpenseIncomeNetYearTwo
2016	0.3esv_FiniteLivedIntangibleAssetsExpenseIncomeNetYearThree
Total	(5.0)esv_FiniteLivedIntangibleAssetsExpenseIncomeNet
Share Price			$ 25.88us-gaap_SharePrice
Asset Impairment Charges, Assumptions Used, Terminal Growth Rate	3.00%esv_AssetImpairmentChargesAssumptionsUsedTerminalGrowthRate
Floaters [Member]
Goodwill [Line Items]
Goodwill, Gross	3,081.4us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember	3,081.4us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember				3,081.4us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount					7.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember
Goodwill	83.5us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember	3,081.4us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember				3,081.4us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember
Finite-Lived Intangible Assets, Net, Amortization Income (Expense), Fiscal Year Maturity [Abstract]
Goodwill, Impaired, Accumulated Impairment Loss	(2,997.9)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember	0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember				0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember
Jackups [Member]
Goodwill [Line Items]
Goodwill, Gross	192.6us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember	192.6us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember				192.6us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember
Goodwill	192.6us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember	192.6us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember				192.6us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember
Finite-Lived Intangible Assets, Net, Amortization Income (Expense), Fiscal Year Maturity [Abstract]
Goodwill, Impaired, Accumulated Impairment Loss	$ 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember	$ 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember				$ 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember
Minimum [Member]
Finite-Lived Intangible Assets, Net, Amortization Income (Expense), Fiscal Year Maturity [Abstract]
Share Price During The Period	$ 25.88esv_SharePriceDuringThePeriod / us-gaap_RangeAxis = us-gaap_MinimumMember
Asset Impairment Charges, Assumptions Used, Price-To-Earnings Multiple	6.0esv_AssetImpairmentChargesAssumptionsUsedPriceToEarningsMultiple / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member]
Finite-Lived Intangible Assets, Net, Amortization Income (Expense), Fiscal Year Maturity [Abstract]
Share Price During The Period	$ 41.99esv_SharePriceDuringThePeriod / us-gaap_RangeAxis = us-gaap_MaximumMember
Asset Impairment Charges, Assumptions Used, Price-To-Earnings Multiple	6.75esv_AssetImpairmentChargesAssumptionsUsedPriceToEarningsMultiple / us-gaap_RangeAxis = us-gaap_MaximumMember
Weighted Average [Member]
Finite-Lived Intangible Assets, Net, Amortization Income (Expense), Fiscal Year Maturity [Abstract]
Share Price	$ 35.23us-gaap_SharePrice / us-gaap_RangeAxis = us-gaap_WeightedAverageMember

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Intangible Liabilities, Net (Excluding Goodwill)

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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