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Discontinued Operations (Schedule of Rig Sales) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 32 Months Ended 3 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2014
Sep. 30, 2014
Mar. 31, 2014
Jun. 30, 2014
Mar. 31, 2013
Oct. 31, 2012
Jun. 30, 2012
May 31, 2012
Sep. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Net Book Value $ 291.8us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation [1],[2]     $ 291.8us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation [1],[2] $ 291.8us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation [1],[2]                
Pre-tax Gain/(Loss)       19.3us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax [2],[3]                  
Net Cash Provided by (Used in) Discontinued Operations 105.5us-gaap_NetCashProvidedByUsedInDiscontinuedOperations 202.1us-gaap_NetCashProvidedByUsedInDiscontinuedOperations 290.8us-gaap_NetCashProvidedByUsedInDiscontinuedOperations 311.1us-gaap_NetCashProvidedByUsedInDiscontinuedOperations [2]                  
Floaters [Member] | ENSCO 5000 [Member]                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Net Book Value 0.5us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_ENSCO5000Member
/ us-gaap_StatementBusinessSegmentsAxis
= esv_FloatersMember		 [1],[2]     0.5us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_ENSCO5000Member
/ us-gaap_StatementBusinessSegmentsAxis
= esv_FloatersMember		 [1],[2] 0.5us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_ENSCO5000Member
/ us-gaap_StatementBusinessSegmentsAxis
= esv_FloatersMember		 [1],[2]                
Pre-tax Gain/(Loss)         0.8us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_ENSCO5000Member
/ us-gaap_StatementBusinessSegmentsAxis
= esv_FloatersMember		                
Net Cash Provided by (Used in) Discontinued Operations         1.3us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_ENSCO5000Member
/ us-gaap_StatementBusinessSegmentsAxis
= esv_FloatersMember		 [2]                
Floaters [Member] | ENSCO 5003 [Member]                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Net Book Value     89.4us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_Ensco5003RigMember
/ us-gaap_StatementBusinessSegmentsAxis
= esv_FloatersMember		 [1],[2]                    
Pre-tax Gain/(Loss)     (21.2)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_Ensco5003RigMember
/ us-gaap_StatementBusinessSegmentsAxis
= esv_FloatersMember		                    
Net Cash Provided by (Used in) Discontinued Operations     68.2us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_Ensco5003RigMember
/ us-gaap_StatementBusinessSegmentsAxis
= esv_FloatersMember		 [2]                    
Jackups [Member] | ENSCO 93 [Member]                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Net Book Value           52.9us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_ENSCO93Member
/ us-gaap_StatementBusinessSegmentsAxis
= esv_JackupsMember		 [1],[2]              
Pre-tax Gain/(Loss) 1.2us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_ENSCO93Member
/ us-gaap_StatementBusinessSegmentsAxis
= esv_JackupsMember		         (1.2)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_ENSCO93Member
/ us-gaap_StatementBusinessSegmentsAxis
= esv_JackupsMember		              
Net Cash Provided by (Used in) Discontinued Operations 51.7us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_ENSCO93Member
/ us-gaap_StatementBusinessSegmentsAxis
= esv_JackupsMember		 [2]         51.7us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_ENSCO93Member
/ us-gaap_StatementBusinessSegmentsAxis
= esv_JackupsMember		 [2]              
Jackups [Member] | ENSCO 69 And Wisconsin [Member]                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Net Book Value             8.6us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_ENSCO69AndWisconsinMember
/ us-gaap_StatementBusinessSegmentsAxis
= esv_JackupsMember		 [1],[2]            
Pre-tax Gain/(Loss)             23.6us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_ENSCO69AndWisconsinMember
/ us-gaap_StatementBusinessSegmentsAxis
= esv_JackupsMember		            
Net Cash Provided by (Used in) Discontinued Operations             32.2us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_ENSCO69AndWisconsinMember
/ us-gaap_StatementBusinessSegmentsAxis
= esv_JackupsMember		 [2]            
Jackups [Member] | ENSCO 85 [Member]                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Net Book Value               54.1us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_ENSCO85Member
/ us-gaap_StatementBusinessSegmentsAxis
= esv_JackupsMember		 [1],[2]          
Pre-tax Gain/(Loss)               10.3us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_ENSCO85Member
/ us-gaap_StatementBusinessSegmentsAxis
= esv_JackupsMember		          
Net Cash Provided by (Used in) Discontinued Operations               64.4us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_ENSCO85Member
/ us-gaap_StatementBusinessSegmentsAxis
= esv_JackupsMember		 [2]          
Jackups [Member] | Pride Pennsylvania Rig [Member]                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Net Book Value                 15.7us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_PridePennsylvaniaRigMember
/ us-gaap_StatementBusinessSegmentsAxis
= esv_JackupsMember		 [1],[2]        
Pre-tax Gain/(Loss)                 (0.2)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_PridePennsylvaniaRigMember
/ us-gaap_StatementBusinessSegmentsAxis
= esv_JackupsMember		        
Net Cash Provided by (Used in) Discontinued Operations                 15.5us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_PridePennsylvaniaRigMember
/ us-gaap_StatementBusinessSegmentsAxis
= esv_JackupsMember		 [2]        
Jackups [Member] | Pride Hawaii [Member]                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Net Book Value                   16.8us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_PrideHawaiiRigMember
/ us-gaap_StatementBusinessSegmentsAxis
= esv_JackupsMember		 [1],[2]      
Pre-tax Gain/(Loss)                   2.0us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_PrideHawaiiRigMember
/ us-gaap_StatementBusinessSegmentsAxis
= esv_JackupsMember		      
Net Cash Provided by (Used in) Discontinued Operations                   18.8us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_PrideHawaiiRigMember
/ us-gaap_StatementBusinessSegmentsAxis
= esv_JackupsMember		 [2]      
Jackups [Member] | ENSCO 61 [Member]                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Net Book Value                     19.6us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_Ensco61RigMember
/ us-gaap_StatementBusinessSegmentsAxis
= esv_JackupsMember		 [1],[2]    
Pre-tax Gain/(Loss)                     12.1us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_Ensco61RigMember
/ us-gaap_StatementBusinessSegmentsAxis
= esv_JackupsMember		    
Net Cash Provided by (Used in) Discontinued Operations                     31.7us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_Ensco61RigMember
/ us-gaap_StatementBusinessSegmentsAxis
= esv_JackupsMember		 [2]    
Jackups [Member] | ENSCO 59 [Member]                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Net Book Value                       21.9us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_Ensco59RigMember
/ us-gaap_StatementBusinessSegmentsAxis
= esv_JackupsMember		 [1],[2]  
Pre-tax Gain/(Loss)                       0.9us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_Ensco59RigMember
/ us-gaap_StatementBusinessSegmentsAxis
= esv_JackupsMember		  
Net Cash Provided by (Used in) Discontinued Operations                       22.8us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_Ensco59RigMember
/ us-gaap_StatementBusinessSegmentsAxis
= esv_JackupsMember		 [2]  
Other [Member] | ENSCO I [Member]                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Net Book Value                         12.3us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_EnscoIRigMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 [1],[2]
Pre-tax Gain/(Loss)                         (7.8)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_EnscoIRigMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Net Cash Provided by (Used in) Discontinued Operations                         $ 4.5us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_EnscoIRigMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 [2]
[1] Includes the rig's net book value as well as inventory and other assets on the date of the sale.
[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.
[3] 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.