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Discontinued Operations (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 32 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Jun. 30, 2014
rigs
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Mar. 31, 2014
Sep. 30, 2014
Mar. 31, 2013
Dec. 31, 2014
rigs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Number Of Rigs Committed To Be Sold 5esv_NumberOfRigsCommittedToBeSold                
Pre-tax Gain/(Loss)         $ 19.3us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax [1],[2]        
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]        
Litigation Settlement, Amount   9.6us-gaap_LitigationSettlementAmount              
Legal Fees   3.6us-gaap_LegalFees              
Estimated Litigation Liability   6.4us-gaap_LitigationReserve     6.4us-gaap_LitigationReserve       6.4us-gaap_LitigationReserve
Liability insurance self-insured retention per occurrence   10.0esv_LiabilityInsuranceSelfInsuredRetentionPerOccurrence     10.0esv_LiabilityInsuranceSelfInsuredRetentionPerOccurrence       10.0esv_LiabilityInsuranceSelfInsuredRetentionPerOccurrence
Litigation Settlement, Amount to be Paid by Underwriters   3.2esv_LitigationSettlementAmounttobePaidbyUnderwriters     3.2esv_LitigationSettlementAmounttobePaidbyUnderwriters       3.2esv_LitigationSettlementAmounttobePaidbyUnderwriters
Pride Pennsylvania Rig [Member]                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Impairment charge for asset write down       (2.5)us-gaap_DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= esv_PridePennsylvaniaRigMember		          
Jackups [Member]                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Number Of Rigs Committed To Be Sold   2esv_NumberOfRigsCommittedToBeSold
/ us-gaap_StatementBusinessSegmentsAxis
= esv_JackupsMember		              
Jackups [Member] | ENSCO 69 And Wisconsin [Member]                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
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 93 [Member]                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
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 85 [Member]                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
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]                  
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]  
Floaters [Member]                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Number Of Rigs Committed To Be Sold   6esv_NumberOfRigsCommittedToBeSold
/ us-gaap_StatementBusinessSegmentsAxis
= esv_FloatersMember		             5esv_NumberOfRigsCommittedToBeSold
/ us-gaap_StatementBusinessSegmentsAxis
= esv_FloatersMember
Floaters [Member] | ENSCO 5000 [Member]                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
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]
Discontinued Operations [Member]                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Impairment of Long-Lived Assets to be Disposed of, Tax Benefit   $ 83.5esv_ImpairmentofLongLivedAssetstobeDisposedofTaxBenefit
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SegmentDiscontinuedOperationsMember		              
[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.