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Property And Equipment (Narrative) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 rigs | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use | $ 517,300,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse |  |  |  |  |  |  |  | $ 1,220,800,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse |  |
Cost of Services, Depreciation | 139,400,000 us-gaap_CostOfServicesDepreciation | 135,200,000 us-gaap_CostOfServicesDepreciation | 132,200,000 us-gaap_CostOfServicesDepreciation | 131,100,000 us-gaap_CostOfServicesDepreciation | 127,500,000 us-gaap_CostOfServicesDepreciation | 124,700,000 us-gaap_CostOfServicesDepreciation | 124,000,000 us-gaap_CostOfServicesDepreciation | 120,000,000 us-gaap_CostOfServicesDepreciation | 537,900,000 us-gaap_CostOfServicesDepreciation | 496,200,000 us-gaap_CostOfServicesDepreciation | 443,800,000 us-gaap_CostOfServicesDepreciation
Assets held for sale | 152,400,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent |  |  |  | 8,600,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent |  |  |  | 152,400,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent | 8,600,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent |
Property and equipment | 14,975,500,000 us-gaap_PropertyPlantAndEquipmentGross |  |  |  | 17,498,500,000 us-gaap_PropertyPlantAndEquipmentGross |  |  |  | 14,975,500,000 us-gaap_PropertyPlantAndEquipmentGross | 17,498,500,000 us-gaap_PropertyPlantAndEquipmentGross |
Impairment of Long Lived Assets |  |  |  |  |  |  |  |  | 2,500,000,000 esv_ImpairmentofLongLivedAssets |  |
Impairment of Long-Lived Assets to be Disposed of |  |  |  |  |  |  |  |  | 1,242,300,000 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf |  |
Price Per Barrel | 55 esv_PricePerBarrel | 95 esv_PricePerBarrel |  |  |  |  |  |  | 55 esv_PricePerBarrel |  |
Asset Impairment Charges | 3,515,200,000 us-gaap_AssetImpairmentCharges | 0 us-gaap_AssetImpairmentCharges | 703,500,000 us-gaap_AssetImpairmentCharges | 0 us-gaap_AssetImpairmentCharges |  |  |  |  | 4,218,700,000 us-gaap_AssetImpairmentCharges | 0 us-gaap_AssetImpairmentCharges | 0 us-gaap_AssetImpairmentCharges
Number Of Rigs Committed To Be Sold |  |  | 5 esv_NumberOfRigsCommittedToBeSold |  |  |  |  |  |  |  |
Drilling rigs and equipment [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase in drilling rigs and equipment |  |  |  |  |  |  |  |  | (2,585,800,000)us-gaap_PropertyPlantAndEquipmentGrossPeriodIncreaseDecrease / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_DrillingRightsMember |  |
Property and equipment | 13,253,200,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_DrillingRightsMember |  |  |  | 15,839,000,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_DrillingRightsMember |  |  |  | 13,253,200,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_DrillingRightsMember | 15,839,000,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_DrillingRightsMember |
Work in progress [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property and equipment | 1,587,300,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember |  |  |  | 1,558,500,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember |  |  |  | 1,587,300,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember | 1,558,500,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember |
Work in progress [Member] | Jackup Rigs [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property and equipment | 179,300,000 us-gaap_PropertyPlantAndEquipmentGross / esv_EquipmentByNameAxis = esv_JackupRigsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember |  |  |  | 43,700,000 us-gaap_PropertyPlantAndEquipmentGross / esv_EquipmentByNameAxis = esv_JackupRigsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember |  |  |  | 179,300,000 us-gaap_PropertyPlantAndEquipmentGross / esv_EquipmentByNameAxis = esv_JackupRigsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember | 43,700,000 us-gaap_PropertyPlantAndEquipmentGross / esv_EquipmentByNameAxis = esv_JackupRigsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember |
Work in progress [Member] | Ultra Deepwater Drillships [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property and equipment | 820,100,000 us-gaap_PropertyPlantAndEquipmentGross / esv_EquipmentByNameAxis = esv_UltraDeepwaterDrillshipsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember |  |  |  | 513,400,000 us-gaap_PropertyPlantAndEquipmentGross / esv_EquipmentByNameAxis = esv_UltraDeepwaterDrillshipsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember |  |  |  | 820,100,000 us-gaap_PropertyPlantAndEquipmentGross / esv_EquipmentByNameAxis = esv_UltraDeepwaterDrillshipsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember | 513,400,000 us-gaap_PropertyPlantAndEquipmentGross / esv_EquipmentByNameAxis = esv_UltraDeepwaterDrillshipsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember |
Work in progress [Member] | Premium Jackup Rigs [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property and equipment | 59,200,000 us-gaap_PropertyPlantAndEquipmentGross / esv_EquipmentByNameAxis = esv_PremiumJackupRigsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember |  |  |  | 627,200,000 us-gaap_PropertyPlantAndEquipmentGross / esv_EquipmentByNameAxis = esv_PremiumJackupRigsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember |  |  |  | 59,200,000 us-gaap_PropertyPlantAndEquipmentGross / esv_EquipmentByNameAxis = esv_PremiumJackupRigsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember | 627,200,000 us-gaap_PropertyPlantAndEquipmentGross / esv_EquipmentByNameAxis = esv_PremiumJackupRigsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember |
Rig Enhancement Projects [Member] | Moored Semisubmersible Rigs [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property and equipment | 233,100,000 us-gaap_PropertyPlantAndEquipmentGross / esv_EquipmentByNameAxis = esv_MooredSemisubmersibleRigsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_RigEnhancementProjectsMember |  |  |  |  |  |  |  | 233,100,000 us-gaap_PropertyPlantAndEquipmentGross / esv_EquipmentByNameAxis = esv_MooredSemisubmersibleRigsMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_RigEnhancementProjectsMember |  |
ENSCO DS-2 [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets to be Disposed of |  |  | (288,000,000)us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCODS2Member |  |  |  |  |  |  |  |
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets to be Disposed of | 407,900,000 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf / us-gaap_IncomeStatementLocationAxis = us-gaap_SegmentDiscontinuedOperationsMember |  | 546,400,000 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf / us-gaap_IncomeStatementLocationAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |  |  |  |  |  |  |
Floaters [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  | 991,500,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used, Asset Description |  |  |  |  |  |  |  |  | 2 |  |
Cost of Services, Depreciation |  |  |  |  |  |  |  |  | 358,100,000 us-gaap_CostOfServicesDepreciation / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember | 342,200,000 us-gaap_CostOfServicesDepreciation / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember | 283,300,000 us-gaap_CostOfServicesDepreciation / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember
Asset Impairment Charges |  |  |  |  |  |  |  |  | 3,982,300,000 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember |  |
Number Of Additional Rigs Committed To Be Sold | 1 esv_NumberOfAdditionalRigsCommittedToBeSold / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember |  |  |  |  |  |  |  |  |  |
Number Of Rigs Committed To Be Sold | 5 esv_NumberOfRigsCommittedToBeSold / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember |  |  |  |  |  |  |  | 6 esv_NumberOfRigsCommittedToBeSold / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember |  |
Jackups [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used, Asset Description |  |  |  |  |  |  |  |  | 10 |  |
Cost of Services, Depreciation |  |  |  |  |  |  |  |  | 171,200,000 us-gaap_CostOfServicesDepreciation / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember | 147,500,000 us-gaap_CostOfServicesDepreciation / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember | 151,600,000 us-gaap_CostOfServicesDepreciation / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember
Asset Impairment Charges |  |  |  |  |  |  |  |  | $ 236,400,000 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember |  |
Number Of Additional Rigs Committed To Be Sold | 2 esv_NumberOfAdditionalRigsCommittedToBeSold / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember |  |  |  |  |  |  |  |  |  |
Number Of Rigs Committed To Be Sold |  |  |  |  |  |  |  |  | 2 esv_NumberOfRigsCommittedToBeSold / us-gaap_StatementBusinessSegmentsAxis = esv_JackupsMember |  |

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