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Sale Leaseback (Details) (USD $)
In Millions, unless otherwise specified
 32 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Sale Leaseback Transaction [Line Items]      
Deferred Gain on Sale of Property $ 22.4us-gaap_DeferredGainOnSaleOfProperty $ 22.4us-gaap_DeferredGainOnSaleOfProperty  
Other Accrued Liabilities, Noncurrent 39.8us-gaap_OtherAccruedLiabilitiesNoncurrent 39.8us-gaap_OtherAccruedLiabilitiesNoncurrent 33.3us-gaap_OtherAccruedLiabilitiesNoncurrent
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax 19.3us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax [1],[2]    
ENSCO 83, 89, 93 and 98 [Member]      
Sale Leaseback Transaction [Line Items]      
Proceeds from Sale of Other Property, Plant, and Equipment   211.8us-gaap_ProceedsFromSaleOfOtherPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO838993and98Member		  
Sales Commissions and Fees   5.3us-gaap_SalesCommissionsAndFees
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO838993and98Member		  
Sale Leaseback Transaction, Net Book Value 169.6us-gaap_SaleLeasebackTransactionNetBookValue
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO838993and98Member		 169.6us-gaap_SaleLeasebackTransactionNetBookValue
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO838993and98Member		  
Gain (Loss) on Disposition of Property Plant Equipment   7.5us-gaap_GainLossOnSaleOfPropertyPlantEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO838993and98Member		  
Sale Leaseback Transaction, Deferred Gain, Net 29.4us-gaap_SaleLeasebackTransactionDeferredGainNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO838993and98Member		 29.4us-gaap_SaleLeasebackTransactionDeferredGainNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO838993and98Member		  
Deferred Gain on Sale of Property $ 7.0us-gaap_DeferredGainOnSaleOfProperty
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO838993and98Member		 $ 7.0us-gaap_DeferredGainOnSaleOfProperty
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO838993and98Member		  
[1] In September 2014, we sold jackup rigs ENSCO 83, ENSCO 89, ENSCO 93 and ENSCO 98, all of which are contracted to Pemex. As described below, the loss on sale and operating results of ENSCO 93 were included in (loss) income from discontinued operations, net in our consolidated statement of operations for the three-year period ended December 31, 2014.
[2] The rigs' operating results were reclassified to discontinued operations in our consolidated statements of operations for each of the years in the three-year period ended December 31, 2014 and were previously included within the operating segment noted in the above table.