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Commitments And Contingencies (Capital Commitments) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Property, Plant and Equipment [Line Items]  
Cumulative Paid $ 736.9esv_CapitalCommitmentsPaidtoDate [1]
2014 1,353.5esv_AggregateContractualCapitalCommitmentsDueInOneYear
2015 373.8esv_AggregateContractualCapitalCommitmentsDueInTwoYears
2016 0esv_AggregateContractualCapitalCommitmentsDueInThreeYears
Total 2,464.2esv_TotalAggregateContractualCapitalCommitments [2]
ENSCO DS-8 [Member]  
Property, Plant and Equipment [Line Items]  
Cumulative Paid 161.4esv_CapitalCommitmentsPaidtoDate
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCODS8Member		 [1]
2014 384.4esv_AggregateContractualCapitalCommitmentsDueInOneYear
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCODS8Member
2015 0esv_AggregateContractualCapitalCommitmentsDueInTwoYears
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCODS8Member
2016 0esv_AggregateContractualCapitalCommitmentsDueInThreeYears
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCODS8Member
Total 545.8esv_TotalAggregateContractualCapitalCommitments
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCODS8Member		 [2]
ENSCO DS-9 [Member]  
Property, Plant and Equipment [Line Items]  
Cumulative Paid 157.4esv_CapitalCommitmentsPaidtoDate
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCODS9Member		 [1]
2014 375.0esv_AggregateContractualCapitalCommitmentsDueInOneYear
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCODS9Member
2015 0esv_AggregateContractualCapitalCommitmentsDueInTwoYears
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCODS9Member
2016 0esv_AggregateContractualCapitalCommitmentsDueInThreeYears
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCODS9Member
Total 532.4esv_TotalAggregateContractualCapitalCommitments
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCODS9Member		 [2]
ENSCO DS-10 [Member]  
Property, Plant and Equipment [Line Items]  
Cumulative Paid 206.0esv_CapitalCommitmentsPaidtoDate
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCODS10Member		 [1]
2014 310.3esv_AggregateContractualCapitalCommitmentsDueInOneYear
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCODS10Member
2015 0esv_AggregateContractualCapitalCommitmentsDueInTwoYears
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCODS10Member
2016 0esv_AggregateContractualCapitalCommitmentsDueInThreeYears
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCODS10Member
Total 516.3esv_TotalAggregateContractualCapitalCommitments
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCODS10Member		 [2]
ENSCO 110 [Member]  
Property, Plant and Equipment [Line Items]  
Cumulative Paid 41.0esv_CapitalCommitmentsPaidtoDate
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO110Member		 [1]
2014 166.2esv_AggregateContractualCapitalCommitmentsDueInOneYear
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO110Member
2015 0esv_AggregateContractualCapitalCommitmentsDueInTwoYears
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO110Member
2016 0esv_AggregateContractualCapitalCommitmentsDueInThreeYears
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO110Member
Total 207.2esv_TotalAggregateContractualCapitalCommitments
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO110Member		 [2]
ENSCO 123 [Member]  
Property, Plant and Equipment [Line Items]  
Cumulative Paid 53.5esv_CapitalCommitmentsPaidtoDate
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO123Member		 [1]
2014 0esv_AggregateContractualCapitalCommitmentsDueInOneYear
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO123Member
2015 217.0esv_AggregateContractualCapitalCommitmentsDueInTwoYears
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO123Member
2016 0esv_AggregateContractualCapitalCommitmentsDueInThreeYears
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO123Member
Total 270.5esv_TotalAggregateContractualCapitalCommitments
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO123Member
ENSCO 140 [Member]  
Property, Plant and Equipment [Line Items]  
Cumulative Paid 78.4esv_CapitalCommitmentsPaidtoDate
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO140Member		 [1]
2014 78.9esv_AggregateContractualCapitalCommitmentsDueInOneYear
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO140Member
2015 39.2esv_AggregateContractualCapitalCommitmentsDueInTwoYears
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO140Member
2016 0esv_AggregateContractualCapitalCommitmentsDueInThreeYears
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO140Member
Total 196.5esv_TotalAggregateContractualCapitalCommitments
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO140Member
ENSCO 141 [Member]  
Property, Plant and Equipment [Line Items]  
Cumulative Paid 39.2esv_CapitalCommitmentsPaidtoDate
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO141Member		 [1]
2014 38.7esv_AggregateContractualCapitalCommitmentsDueInOneYear
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO141Member
2015 117.6esv_AggregateContractualCapitalCommitmentsDueInTwoYears
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO141Member
2016 0esv_AggregateContractualCapitalCommitmentsDueInThreeYears
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO141Member
Total $ 195.5esv_TotalAggregateContractualCapitalCommitments
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= esv_ENSCO141Member
[1] Cumulative paid represents the aggregate amount of contractual payments made from commencement of the construction agreement through December 31, 2014.
[2] Total commitments are based on fixed-price shipyard construction contracts, exclusive of costs associated with commissioning, systems integration testing, project management and capitalized interest.