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Derivative Instruments (Schedule Of Estimated Amount Of Net Gains Associated With Derivatives) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Net unrealized gains to be reclassified to contract drilling expense | $ (9.4)esv_NetUnrealizedGainsLossesToBeReclassifiedToContractDrillingExpense
Net realized gains to be reclassified to depreciation expense | 0.9 esv_NetRealizedGainsToBeReclassifiedToDepreciationExpense
Net realized (losses) to be reclassified to interest expense | (0.4)esv_NetRealizedLossesToBeReclassifiedToInterestExpense
Net gains to be reclassified to earnings | $ (8.9)esv_NetGainsLossesToBeReclassifiedToEarnings

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- Definition Net Gains (Losses) To Be Reclassified To Earnings + References No definition available. + Details
Name: | esv_NetGainsLossesToBeReclassifiedToEarnings
Namespace Prefix: | esv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Net Realized Gains To Be Reclassified To Depreciation Expense + References No definition available. + Details
Name: | esv_NetRealizedGainsToBeReclassifiedToDepreciationExpense
Namespace Prefix: | esv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Net Realized Losses To Be Reclassified To Interest Expense + References No definition available. + Details
Name: | esv_NetRealizedLossesToBeReclassifiedToInterestExpense
Namespace Prefix: | esv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Net Unrealized Gains (Losses) To Be Reclassified To Contract Drilling Expense + References No definition available. + Details
Name: | esv_NetUnrealizedGainsLossesToBeReclassifiedToContractDrillingExpense
Namespace Prefix: | esv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration