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Description Of The Business And Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) Share data in Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 continent country segments service rigs | Dec. 31, 2013 | Dec. 31, 2012
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of rigs under construction | 7 esv_NumberOfRigsUnderConstruction |  |
Number of different countries having drilling contracts spanning | 20 esv_NumberOfDifferentCountriesHavingDrillingContractsSpanning |  |
Number of different continents having drilling contracts | 6 esv_NumberOfDifferentContinentsHavingDrillingContracts |  |
Net foreign currency exchange gains (losses) | $ (2,600,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | $ 6,400,000 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | $ (3,500,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Short-term Investments | 757,300,000 us-gaap_ShortTermInvestments | 50,000,000 us-gaap_ShortTermInvestments |
Number of operating segments | 3 us-gaap_NumberOfOperatingSegments |  |
Number of reportable segments | 2 us-gaap_NumberOfReportableSegments |  |
Number of services | 1 esv_NumberOfServices |  |
Antidilutive share options excluded from computation of diluted earnings per share | 0.4 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 0.3 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 0.4 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Impairment of Long Lived Assets | 2,500,000,000 esv_ImpairmentofLongLivedAssets |  |
Deferred Mobilization Costs [Member] |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Other assets | 95,700,000 us-gaap_OtherAssets / esv_OperatingExpensesAxis = esv_DeferredMobilizationCostsMember | 66,600,000 us-gaap_OtherAssets / esv_OperatingExpensesAxis = esv_DeferredMobilizationCostsMember |
Deferred Regulatory Certification And Compliance Costs [Member] |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Other assets | 20,000,000 us-gaap_OtherAssets / esv_OperatingExpensesAxis = esv_DeferredRegulatoryCertificationAndComplianceCostsMember | 18,300,000 us-gaap_OtherAssets / esv_OperatingExpensesAxis = esv_DeferredRegulatoryCertificationAndComplianceCostsMember |
Offshore Drilling Rigs [Member] |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of contract drilling rigs | 70 |  |
Ultra Deepwater Drillships [Member] |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of contract drilling rigs | 10 |  |
Semisubmersible Rigs [Member] |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of contract drilling rigs | 13 |  |
Moored Semisubmersible Rigs [Member] |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of contract drilling rigs | 5 |  |
Jackup Rigs [Member] |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of contract drilling rigs | 42 |  |
Drilling Rigs And Equipment [Member] | Minimum [Member] |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives assets, minimum years | 4 years |  |
Drilling Rigs And Equipment [Member] | Maximum [Member] |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives assets, minimum years | 35 years |  |
Buildings And Improvements [Member] | Minimum [Member] |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives assets, minimum years | 2 years |  |
Buildings And Improvements [Member] | Maximum [Member] |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives assets, minimum years | 30 years |  |
Other Equipment, Computer And Communications Hardware And Software [Member] | Minimum [Member] |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives assets, minimum years | 2 years |  |
Other Equipment, Computer And Communications Hardware And Software [Member] | Maximum [Member] |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives assets, minimum years | 6 years |  |
Capital Reimbursements [Member] |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Deferred revenue | 428,900,000 us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = esv_CapitalReimbursementsMember | 273,600,000 us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = esv_CapitalReimbursementsMember |
Mobilization Revenue [Member] |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Deferred revenue | $ 149,400,000 us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = esv_MobilizationRevenueMember | $ 76,800,000 us-gaap_DeferredRevenue / us-gaap_DeferredRevenueArrangementTypeAxis = esv_MobilizationRevenueMember |

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