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Commitments And Contingencies (Capital Commitments) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014
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Property, Plant and Equipment [Line Items] |  |
Cumulative Paid | $ 736.9 esv_CapitalCommitmentsPaidtoDate | [1]
2014 | 1,353.5 esv_AggregateContractualCapitalCommitmentsDueInOneYear |
2015 | 373.8 esv_AggregateContractualCapitalCommitmentsDueInTwoYears |
2016 | 0 esv_AggregateContractualCapitalCommitmentsDueInThreeYears |
Total | 2,464.2 esv_TotalAggregateContractualCapitalCommitments | [2]
ENSCO DS-8 [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Cumulative Paid | 161.4 esv_CapitalCommitmentsPaidtoDate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCODS8Member | [1]
2014 | 384.4 esv_AggregateContractualCapitalCommitmentsDueInOneYear / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCODS8Member |
2015 | 0 esv_AggregateContractualCapitalCommitmentsDueInTwoYears / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCODS8Member |
2016 | 0 esv_AggregateContractualCapitalCommitmentsDueInThreeYears / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCODS8Member |
Total | 545.8 esv_TotalAggregateContractualCapitalCommitments / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCODS8Member | [2]
ENSCO DS-9 [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Cumulative Paid | 157.4 esv_CapitalCommitmentsPaidtoDate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCODS9Member | [1]
2014 | 375.0 esv_AggregateContractualCapitalCommitmentsDueInOneYear / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCODS9Member |
2015 | 0 esv_AggregateContractualCapitalCommitmentsDueInTwoYears / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCODS9Member |
2016 | 0 esv_AggregateContractualCapitalCommitmentsDueInThreeYears / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCODS9Member |
Total | 532.4 esv_TotalAggregateContractualCapitalCommitments / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCODS9Member | [2]
ENSCO DS-10 [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Cumulative Paid | 206.0 esv_CapitalCommitmentsPaidtoDate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCODS10Member | [1]
2014 | 310.3 esv_AggregateContractualCapitalCommitmentsDueInOneYear / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCODS10Member |
2015 | 0 esv_AggregateContractualCapitalCommitmentsDueInTwoYears / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCODS10Member |
2016 | 0 esv_AggregateContractualCapitalCommitmentsDueInThreeYears / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCODS10Member |
Total | 516.3 esv_TotalAggregateContractualCapitalCommitments / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCODS10Member | [2]
ENSCO 110 [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Cumulative Paid | 41.0 esv_CapitalCommitmentsPaidtoDate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCO110Member | [1]
2014 | 166.2 esv_AggregateContractualCapitalCommitmentsDueInOneYear / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCO110Member |
2015 | 0 esv_AggregateContractualCapitalCommitmentsDueInTwoYears / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCO110Member |
2016 | 0 esv_AggregateContractualCapitalCommitmentsDueInThreeYears / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCO110Member |
Total | 207.2 esv_TotalAggregateContractualCapitalCommitments / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCO110Member | [2]
ENSCO 123 [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Cumulative Paid | 53.5 esv_CapitalCommitmentsPaidtoDate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCO123Member | [1]
2014 | 0 esv_AggregateContractualCapitalCommitmentsDueInOneYear / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCO123Member |
2015 | 217.0 esv_AggregateContractualCapitalCommitmentsDueInTwoYears / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCO123Member |
2016 | 0 esv_AggregateContractualCapitalCommitmentsDueInThreeYears / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCO123Member |
Total | 270.5 esv_TotalAggregateContractualCapitalCommitments / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCO123Member |
ENSCO 140 [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Cumulative Paid | 78.4 esv_CapitalCommitmentsPaidtoDate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCO140Member | [1]
2014 | 78.9 esv_AggregateContractualCapitalCommitmentsDueInOneYear / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCO140Member |
2015 | 39.2 esv_AggregateContractualCapitalCommitmentsDueInTwoYears / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCO140Member |
2016 | 0 esv_AggregateContractualCapitalCommitmentsDueInThreeYears / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCO140Member |
Total | 196.5 esv_TotalAggregateContractualCapitalCommitments / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCO140Member |
ENSCO 141 [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Cumulative Paid | 39.2 esv_CapitalCommitmentsPaidtoDate / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCO141Member | [1]
2014 | 38.7 esv_AggregateContractualCapitalCommitmentsDueInOneYear / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCO141Member |
2015 | 117.6 esv_AggregateContractualCapitalCommitmentsDueInTwoYears / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCO141Member |
2016 | 0 esv_AggregateContractualCapitalCommitmentsDueInThreeYears / us-gaap_PropertyPlantAndEquipmentByTypeAxis = esv_ENSCO141Member |
Total | $ 195.5 esv_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.

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