Supplemental Financial Information [Abstract]
Supplemental Financial Information [Abstract]
Supplemental Balance Sheet Disclosures [Text Block]
Supplemental Balance Sheet Disclosures [Text Block]
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Summary Of Components Of Provision For Income Taxes From Continuing Operations
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Summary Of Significant Components Of Deferred Income Tax Assets (Liabilities)
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Summary Of Effective Income Tax Rate On Continuing Operations
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Summary Of Reconciliation Of The Beginning And Ending Amount Of Unrecognized Tax Benefits
Summary of Income Tax Contingencies [Table Text Block]
Debt Instruments [Abstract]
Schedule Of Long-Term Debt Instruments
Schedule of Long-term Debt Instruments [Table Text Block]
Aggregate Maturities Of Long-Term Debt
Schedule of Maturities of Long-term Debt [Table Text Block]
Quarterly Financial Data [Abstract]
Unaudited Quarterly Financial Data
Quarterly Financial Information [Text Block]
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill [Table]
Schedule of Goodwill [Table]
Scenario [Axis]
Scenario [Axis]
Scenario, Unspecified [Domain]
Scenario, Unspecified [Domain]
Scenario, Forecast [Member]
Scenario, Forecast [Member]
Range [Axis]
Range [Axis]
Range [Domain]
Range [Domain]
Minimum [Member]
Minimum [Member]
Maximum [Member]
Maximum [Member]
Weighted Average [Member]
Weighted Average [Member]
Segments [Axis]
Segments [Axis]
Segments [Domain]
Segments [Domain]
Floaters [Member]
Floaters [Member]
Floaters [Member]
Jackups [Member]
Jackups Member
Jackups [Member]
Goodwill [Line Items]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Expense (Income), Net, Next Twelve Months
Finite-Lived Intangible Assets, Expense (Income), Net, Next Twelve Months
Finite-Lived Intangible Assets, Expense (Income), Net, Next Twelve Months
Asset Impairment Charges, Assumptions Used, Weighted Average Capital Cost
Asset Impairment Charges, Assumptions Used, Weighted Average Capital Cost
Asset Impairment Charges, Assumptions Used, Weighted Average Capital Cost
Goodwill, Gross
Goodwill, Gross
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount
Price Per Barrel
Price Per Barrel
Price Per Barrel
Goodwill
Goodwill
Drilling contract intangible assets, Gross Carrying Amount
Finite-Lived Intangible Assets, Gross
Intangible Assets, Accumulated Amortization [Roll Forward]
Intangible Assets, Accumulated Amortization [Roll Forward]
Intangible Assets, Accumulated Amortization [Roll Forward]
Balance, beginning of period
Finite-Lived Intangible Assets, Accumulated Amortization
Amortization
Amortization of Intangible Assets
Balance, end of period
Intangible Assets, Net Carrying Amount [Roll Forward]
Intangible Assets, Net Carrying Amount [Roll Forward]
Intangible Assets, Net Carrying Amount [Roll Forward]
Balance, beginning of period
Intangible Assets, Net (Excluding Goodwill)
Amortization
Balance, end of period
Drilling contract intangible liabilities, Gross Carrying Amount
Finite-Lived Intangible Liabilities, Gross
Finite-Lived Intangible Liabilities, Gross
Intangible Liabilities, Accumulated Amortization [Roll Forward]
Intangible Liabilities, Accumulated Amortization [Roll Forward]
Intangible Liabilities, Accumulated Amortization [Roll Forward]
Balance, beginning of period
Finite-Lived Intangible Liabilities, Accumulated Amortization
Finite-Lived Intangible Liabilities, Accumulated Amortization
Amortization
Amortization Income
Amortization Income
Balance, end of period
Intangible Liabilities, Net Carrying Amount [Roll Forward]
Intangible Liabilities, Net Carrying Amount [Roll Forward]
Intangible Liabilities, Net Carrying Amount [Roll Forward]
Balance, beginning of period
Intangible Liabilities, Net (Excluding Goodwill)
Intangible Liabilities, Net (Excluding Goodwill)
Amortization
Balance, end of period
Finite-Lived Intangible Assets, Net, Amortization Income (Expense), Fiscal Year Maturity [Abstract]
Finite-Lived Intangible Assets, Net, Amortization Expense (Income), Fiscal Year Maturity [Abstract]
Finite-Lived Intangible Assets, Net, Amortization Expense (Income), Fiscal Year Maturity [Abstract]
2015
Finite-Lived Intangible Assets, Expense (Income), Net, Year Two
Finite-Lived Intangible Assets, Expense (Income), Net, Year Two
2016
Finite-Lived Intangible Assets, Expense (Income), Net, Year Three
Finite-Lived Intangible Assets, Expense (Income), Net, Year Three
Total
Finite-Lived Intangible Assets, Expense (Income), Net
Finite-Lived Intangible Assets, Expense (Income), Net
Share Price
Share Price
Share Price During The Period
Share Price During The Period
Share Price During The Period
Average Share Price
Average Share Price
Average Share Price
Goodwill, Impaired, Accumulated Impairment Loss
Goodwill, Impaired, Accumulated Impairment Loss
Goodwill, Impairment Loss
Goodwill, Impairment Loss
Asset Impairment Charges, Assumptions Used, Terminal Growth Rate
Asset Impairment Charges, Assumptions Used, Terminal Growth Rate
Asset Impairment Charges, Assumptions Used, Terminal Growth Rate
Income Statement [Abstract]
OPERATING REVENUES
Revenue, Oil and Gas Services
OPERATING EXPENSES
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)
Cost of Services, Oil and Gas
Asset Impairment Charges
Asset Impairment Charges
Depreciation
Cost of Services, Depreciation
General and administrative
General and Administrative Expense
Total operating expenses
Costs and Expenses
OPERATING INCOME
Operating Income (Loss)
OTHER INCOME (EXPENSE)
Other Nonoperating Income (Expense) [Abstract]
Interest income
Other Interest and Dividend Income
Interest expense, net
Interest Expense
Other, net
Other Nonoperating Income (Expense)
Other income (expense), net
Nonoperating Income (Expense)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest
PROVISION FOR INCOME TAXES
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current income tax expense
Current Income Tax Expense (Benefit)
Deferred income tax expense (benefit)
Deferred Income Tax Expense (Benefit)
Total provision for income taxes
Income Tax Expense (Benefit)
INCOME FROM CONTINUING OPERATIONS
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest
DISCONTINUED OPERATIONS, NET
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest
NET INCOME
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS
Net Income (Loss) Attributable to Noncontrolling Interest
NET INCOME ATTRIBUTABLE TO ENSCO
Net Income (Loss) Attributable to Parent
EARNINGS PER SHARE - BASIC
Earnings Per Share, Basic [Abstract]
Continuing operations
Income (Loss) from Continuing Operations, Per Basic Share
Discontinued operations
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share
Total earnings per share - basic
Earnings Per Share, Basic
EARNINGS PER SHARE - DILUTED
Earnings Per Share, Diluted [Abstract]
Continuing operations
Income (Loss) from Continuing Operations, Per Diluted Share
Discontinued operations
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share
Total earnings per share - diluted
Earnings Per Share, Diluted
NET INCOME ATTRIBUTABLE TO ENSCO SHARES - BASIC AND DILUTED
Net Income (Loss) Available to Common Stockholders, Diluted
WEIGHTED-AVERAGE SHARES OUTSTANDING
Weighted Average Common Shares Outstanding [Abstract]
Weighted-Average Common Shares Outstanding [Abstract]
Basic
Weighted Average Number of Shares Outstanding, Basic
Diluted
Weighted Average Number of Shares Outstanding, Diluted
CASH DIVIDENDS PER SHARE
Common Stock, Dividends, Per Share, Cash Paid
Property, Plant and Equipment [Abstract]
Public Utility, Property, Plant and Equipment [Table]
Public Utility, Property, Plant and Equipment [Table]
Property, Plant and Equipment by Type [Axis]
Property, Plant and Equipment, Type [Axis]
Property, Plant and Equipment, Type [Domain]
Property, Plant and Equipment, Type [Domain]
Drilling rigs and equipment [Member]
Drilling Rights [Member]
Other [Member]
Other Capitalized Property Plant and Equipment [Member]
Work in progress [Member]
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment [Line Items]
Property and equipment
Property, Plant and Equipment, Gross
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Schedule of Segment Reporting Information, by Segment [Table]
Schedule of Segment Reporting Information, by Segment [Table]
Segments [Axis]
Segments [Domain]
Other [Member]
Other Segments [Member]
Operating Segments Total [Member]
Operating Segments Total Member
Operating Segments Total [Member]
Reconciling Items [Member]
Reconciling Items Member
Reconciling Items [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
Revenues
Operating expenses - Contract drilling (exclusive of depreciation)
Property and equipment, net
Property, Plant and Equipment, Net
Capital expenditures
Payments to Acquire Property, Plant, and Equipment
Debt
Debt Disclosure [Text Block]
2016
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months
2017
Long-term Debt, Maturities, Repayments of Principal in Year Two
2018
Long-term Debt, Maturities, Repayments of Principal in Year Three
2019
Long-term Debt, Maturities, Repayments of Principal in Year Four
2020
Long-term Debt, Maturities, Repayments of Principal in Year Five
Thereafter
Long-term Debt, Maturities, Repayments of Principal after Year Five
Total
Long-term Debt
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax
Derivative Instruments
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax
Other
Accumulated Other Comprehensive Income (Loss), Other, Net of Tax
Accumulated Other Comprehensive Income (Loss), Other, Net of Tax
Accumulated other comprehensive income
Accumulated Other Comprehensive Income (Loss), Net of Tax
Statement [Table]
Statement [Table]
Impairment of Long-Lived Assets [Axis]
Impairment of Long-Lived Assets [Axis]
Impairment of Long-Lived Assets [Axis]
Impairment of Long-Lived Assets [Domain]
Impairment of Long-Lived Assets [Domain]
[Domain] for Impairment of Long-Lived Assets [Axis]
Rig Impairments [Member]
Rig Impairments [Member]
Rig Impairments [Member]
Income Tax Authority [Axis]
Income Tax Authority [Axis]
Income Tax Authority [Domain]
Income Tax Authority [Domain]
Mexican Tax Authority [Member]
Mexican Tax Authority [Member]
Balance Sheet Location [Axis]
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Balance Sheet Location [Domain]
Other Liabilities [Member]
Other Liabilities [Member]
Statement [Line Items]
Statement [Line Items]
Income Tax Expense (Benefit), Discrete Item
income Tax Expense (Benefit), Discrete Item
income Tax Expense (Benefit), Discrete Item
Income from continuing operations before income taxes in the U.S. countries
Income (Loss) from Continuing Operations before Income Taxes, Domestic
Income from continuing operations before income taxes in the non-U.S. countries
Income (Loss) from Continuing Operations before Income Taxes, Foreign
Deferred tax assets related to U.S. foreign tax credits
Deferred Tax Assets, Operating Loss Carryforwards, Foreign
Deferred tax assets related to net operating loss carryforwards
Deferred Tax Assets, Operating Loss Carryforwards
Net operating loss carryforwards
Operating Loss Carryforwards
Deferred Tax Assets, Foreign, Expiration Date
Deferred Tax Assets, Foreign, Expiration Date
Deferred Tax Assets, Foreign, Expiration Date
Operating loss carryforwards tax credits expiration year
Operating Loss Carryforwards Tax Credits Expiration Dates
Operating Loss Carryforwards Tax Credits Expiration Dates
Operating loss carryforwards, Not subject to expiration
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration
Operating loss carryforwards, Subject to expiration
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration
Valuation allowance on NOL carryforwards and FTC
Valuation Allowance On NOL Carryforwards And FTC Due To Uncertainty Of Realization
Valuation Allowance On NOL Carryforwards And FTC Due To Uncertainty Of Realization
Deferred Tax Liabilities, Gross
discrete tax expense
Discrete tax expense attributable to reimbursement received during the current year.
Proceeds from Income Tax Refunds
Litigation Settlement, Amount
Valuation Allowance, Deferred Tax Asset, Change in Amount
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount
Consilidated effective income tax rate excluding discrete items
Effective Income Tax Rate, Continuing Operations, Excluding Discrete Items
Effective Income Tax Rate, Continuing Operations, Excluding Discrete Items
Restructuring Charges, Tax
Restructuring Charges, Tax
Restructuring Charges, Tax
Minimum percentage threshold for recognition of tax benefits
Percent Required For Recognition Of Tax Benefit Amounts
Percent required for recognition of tax benefit amounts.
Total unrecognized tax benefits
Unrecognized Tax Benefits
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions With Net Operating Loss Carryforwards
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions With Net Operating Loss Carryforwards
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions With Net Operating Loss Carryforwards
Amount of unrecognized tax benefits affecting the consolidated effective income tax rate if recognized
Unrecognized Tax Benefits that Would Impact Effective Tax Rate
Amount of accrued interest and penalties included in other liabilities
Unrecognized Tax Benefits, Interest on Income Taxes Accrued
Amount of interest and penalties recognized in net tax expense
Unrecognized Tax Benefits, Interest on Income Taxes Expense
Income tax benefits, inclusive of interest and penalties due to lapses in statute of limitations
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Due to Lapses in Statute of Limitations
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Due to Lapses in Statute of Limitations
Decline in unrecognized tax benefits during next twelve months
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit
Accrued interest and penalty assessments related to the decline in unrecognized tax benefits
Income Tax Examination, Penalties and Interest Accrued
Number of assets transferred (in drillships or jackups)
Number of Assets Transferred
Number of Assets Transferred
Income tax liability from gain on intercompany transfers
Income Tax Liability Transfers To Subsidiary Gains
Income tax liability transfers to subsidiary gains.
Remaining useful life of drilling rigs associated with amortization of deferred income tax expense, minimum years
Finite-Lived Intangible Asset, Useful Life
Unamortized deferred charges related to intercompany transfers
Unamortized Deferred Charges Transfers To Subsidiary
Unamortized deferred charges transfers to subsidiary
Amount included in current income taxes for amortization of deferred income taxes related to intercompany transfers
Amortization of Deferred Charges
Deferred tax liability related to temporary difference from transferred drilling rigs
Deferred Tax Liability Related to Temporary Difference From Transferred Drilling Rigs
Deferred tax liability related to temporary difference from transferred drilling rigs.
Tax benefits included in deferred income tax expense related to amortization of deferred reversing temporary differences from intercompany transfers
Deferred Tax Expense Benefit Amortization Of Deferred Charges
Deferred tax expense benefit amortization of deferred charges.
Aggregate Indefinitely reinvested undistributed subsidiary earnings.
Indefinitely Reinvested Undistributed Subsidiary Earnings
Indefinitely reinvested undistributed subsidiary earnings.
Undistributed Earnings of Foreign Subsidiaries
Undistributed Earnings of Foreign Subsidiaries
Schedule Of Property And Equipment
Property, Plant and Equipment [Table Text Block]
Description Of The Business And Summary Of Significant Accounting Policies [Abstract]
Description of the business and summary of significant accounting policies [Abstract].
Description Of The Business And Summary Of Significant Accounting Policies [Table]
Description Of The Business And Summary Of Significant Accounting Policies [Table]
Description Of The Business And Summary Of Significant Accounting Policies [Table]
Impairment impact [Axis]
Impairment impact [Axis]
Impairment impact [Axis]
Impairment impact [Domain]
Impairment impact [Domain]
[Domain] for Impairment impact [Axis]
Impairment impact [Member]
Impairment impact [Member]
Impairment impact [Member]
Change in useful lives [Axis]
Change in useful lives [Axis]
Change in useful lives [Axis]
Change in useful lives [Domain]
Change in useful lives [Domain]
[Domain] for Change in useful lives [Axis]
Change in useful lives [Member]
Change in useful lives [Member]
Change in useful lives [Member]
Change in depreciation expense [Axis]
Change in depreciation expense [Axis]
Change in depreciation expense [Axis]
Change in depreciation expense [Domain]
Change in depreciation expense [Domain]
[Domain] for Change in depreciation expense [Axis]
Change in depreciation expense [Member]
Change in depreciation expense [Member]
Change in depreciation expense [Member]
Products and Services [Axis]
Products and Services [Axis]
Deferred Revenue [Domain]
Deferred Revenue [Domain]
Capital Reimbursements [Member]
Capital Reimbursements [Member]
Capital Reimbursements [Member]
Mobilization Revenue [Member]
Mobilization Revenue [Member]
Mobilization Revenue [Member]
Ensco DS-9 [Member]
Ensco DS-9 [Member]
Ensco DS-9 [Member]
Ensco DS-4 [Member]
Ensco DS-4 [Member]
Ensco DS-4 [Member]
Income Statement Location [Axis]
Income Statement Location [Axis]
Income Statement Location [Domain]
Income Statement Location [Domain]
Sales Revenue, Net [Member]
Sales Revenue, Net [Member]
Deferred Revenue Arrangement Type [Axis]
Deferred Revenue Arrangement Type [Axis]
Ultra Deepwater Drillships [Member]
Ultra Deepwater Drillships [Member]
Ultra-Deepwater Drillships [Member]
Semisubmersible Rigs [Member]
Ultra Deepwater Semisubmersible Rig Member
Ultra Deepwater Semisubmersible Rig [Member]
Moored Semisubmersible Rigs [Member]
Moored Semisubmersible Rigs [Member]
Moored Semisubmersible Rigs [Member]
Jackup Rigs [Member]
Jackup Rigs Member
Jackup Rigs [Member]
Building and Building Improvements [Member]
Building and Building Improvements [Member]
Other Equipment And Computer Hardware Software [Member]
Other Equipment And Computer Hardware Software [Member]
Other Equipment And Computer Hardware Software [Member]
Operating Expenses [Axis]
Operating Expenses [Axis]
Operating Expenses [Axis]
Operating Expenses [Domain]
Operating Expenses [Domain]
Operating Expenses [Domain]
Deferred Mobilization Costs [Member]
Deferred Mobilization Costs [Member]
Deferred Mobilization Costs [Member]
Deferred Regulatory Certification And Compliance Costs [Member]
Deferred Regulatory Certification And Compliance Costs [Member]
Deferred Regulatory Certification And Compliance Costs [Member]
New Accounting Pronouncement, Early Adoption [Axis]
New Accounting Pronouncement, Early Adoption [Axis]
New Accounting Principles, Early Adoption [Domain]
New Accounting Principles, Early Adoption [Domain]
New Accounting Pronouncement, Early Adoption, Effect [Member]
New Accounting Pronouncement, Early Adoption, Effect [Member]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life
Property, Plant and Equipment, Useful Life
Number of contract drilling rigs
Number Of Contract Drilling Rigs
Number Of Contract Drilling Rig
Number of rigs under construction
Number of Rigs Under Construction
Number of Rigs Under Construction
Number of different countries having drilling contracts spanning
Number Of Different Countries Having Drilling Contracts Spanning
Number of different countries having drilling contracts spanning.
Number of different continents having drilling contracts
Number Of Different Continents Having Drilling Contracts
Number Of Different Continents Having Drilling Contracts
Net foreign currency exchange gains (losses)
Foreign Currency Transaction Gain (Loss), before Tax
Short-term Investments
Short-term Investments
Cost of Services, Depreciation
Property, Plant and Equipment, future useful life
Property, Plant and Equipment, future useful life
Property, Plant and Equipment, future useful life
Number of operating segments
Number of Operating Segments
Number of reportable segments
Number of Reportable Segments
Number of services
Number of Services
Number of Services
Other assets
Other Assets
Deferred revenue
Deferred Revenue
Gain (Loss) on Contract Termination
Gain (Loss) on Contract Termination
Other Nonrecurring Income
Other Nonrecurring Income
Antidilutive share options excluded from computation of diluted earnings per share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Impairment of Long Lived Assets
Impairment of Long Lived Assets
Impairment of Long Lived Assets
Deferred tax assets, current
Deferred Tax Assets, Net of Valuation Allowance, Current
Deferred tax assets, noncurrent
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent
Deferred tax liabilities, current
Deferred Tax Liabilities, Net, Current
Deferred tax liabilities, noncurrent
Deferred Tax Liabilities, Net, Noncurrent
Goodwill, Impairment Loss
Impairment of Long-Lived Assets Held-for-use
Impairment of Long-Lived Assets Held-for-use
Fair Value Disclosures [Abstract]
Fair Value, Assets Measured On Recurring Basis [Table]
Fair Value Measurements, Recurring and Nonrecurring [Table]
Debt Instrument [Axis]
Debt Instrument [Axis]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
4.70% Senior notes due 2021 [Member]
Four Point Seven Zero Percent Senior Notes Due Two Thousand Twenty One Member
Four Point Seven Zero Percent Senior Notes Due Two Thousand Twenty One [Member]
6.875% Senior notes due 2020 [Member]
Six Point Eight Seven Five Percent Senior Notes Due Two Thousand Twenty Member
Six Point Eight Seven Five Percent Senior Notes Due Two Thousand Twenty [Member]
3.25% Senior notes due 2016 [Member]
Three Point Two Five Percent Senior Notes Due Two Thousand Sixteen Member
Three Point Two Five Percent Senior Notes Due Two Thousand Sixteen [Member]
Four Point Five Percent Senior Notes Member [Member]
Four Point Five Percent Senior Notes Member [Member]
Four Point Five Percent Senior Notes Member [Member]
Five Point Seven Five Percent Senior Notes [Member]
Five Point Seven Five Percent Senior Notes [Member]
Five Point Seven Five Percent Senior Notes [Member]
8.50% Senior notes due 2019 [Member]
Eight Point Five Zero Percent Senior Notes Due Two Thousand Nineteen Member
Eight Point Five Zero Percent Senior Notes Due Two Thousand Nineteen [Member]
7.875% Senior notes due 2040 [Member]
Seven Point Eight Seven Five Percent Senior Notes Due Two Thousand Forty [Member]
Seven Point Eight Seven Five Percent Senior Notes Due Two Thousand Forty [Member]
7.20% Debentures due 2027 [Member]
Seven Point Two Zero Percent Debentures Due Two Thousand Twenty Seven Member
Seven Point Two Zero Percent Debentures Due Two Thousand Twenty Seven [Member]
4.33% MARAD bonds due 2016 [Member]
Four Point Three Three Percent Notes Due Two Thousand Sixteen Member
Four Point Three Three Percent Notes Due Two Thousand Sixteen [Member]
4.33% MARAD bonds, including current maturities, due 2016 [Member]
Five Point Two Percent Senior Notes [Member]
Five Point Two Percent Senior Notes [Member]
6.36% MARAD bonds, including current maturities, due 2015 [Member]
Six Point Three Six Percent Bonds Due Two Thousand Fifteen Member
Six Point Three Six Percent Bonds Due Two Thousand Fifteen [Member]
4.65% MARAD bonds, including current maturities, due 2020 [Member]
Four Point Six Five Percent Bonds Due Two Thousand Twenty Member
Four Point Six Five Percent Bonds Due Two Thousand Twenty [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt Instrument Carrying Value
Debt Instrument Carrying Value
Debt Instrument Carrying Value
Debt instrument
Debt Instrument, Fair Value Disclosure
Debt instrument, interest rate, stated percentage
Debt Instrument, Interest Rate, Stated Percentage
Debt instrument maturity period
Debt Instrument, Maturity Date, Description
Interest, net of amounts capitalized
Interest Paid, Net
Income taxes
Income Taxes Paid
Statement of Cash Flows [Abstract]
Cash and Cash Equivalents, Period Increase (Decrease) [Abstract]
Cash and Cash Equivalents, Period Increase (Decrease) [Abstract]
Net Cash Provided by (Used In) Operating Activities [Abstract]
Net Cash Provided by (Used in) Operating Activities [Abstract]
OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract]
Net income
Adjustments to reconcile net income to net cash provided by operating activities of continuing operations:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Deferred income tax expense (benefit)
Discontinued operations, net
Share-based compensation expense
Share-based Compensation
Gains (Losses) on Extinguishment of Debt
Gains (Losses) on Extinguishment of Debt
Provision for Doubtful Accounts
Provision for Doubtful Accounts
Amortization of intangibles and other, net
Amortization of Other Deferred Charges
Other
Other Noncash Income (Expense)
Changes in operating assets and liabilities
Increase (Decrease) in Other Operating Assets and Liabilities, Net
Net cash provided by operating activities of continuing operations
Net Cash Provided by (Used in) Operating Activities, Continuing Operations
INVESTING ACTIVITIES
Net Cash Provided by (Used in) Investing Activities [Abstract]
Purchases of short-term investments
Payments for (Proceeds from) Short-term Investments
Additions to property and equipment
Maturities of short-term investments
Proceeds from Sale, Maturity and Collection of Short-term Investments
Proceeds from Sale of Property, Plant, and Equipment
Proceeds from Sale of Property, Plant, and Equipment
Net cash used in investing activities of continuing operations
Net Cash Provided by (Used in) Investing Activities, Continuing Operations
FINANCING ACTIVITIES
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from issuance of senior notes
Proceeds from Issuance of Senior Long-term Debt
Reduction of long-term borrowings
Repayments of Long-term Debt
Cash dividends paid
Payments of Ordinary Dividends, Common Stock
Equity financing costs
Payments of Debt Extinguishment Costs
Debt financing costs
Payments of Debt Issuance Costs
Proceeds from exercise of share options
Proceeds from Stock Options Exercised
Other
Proceeds from (Payments for) Other Financing Activities
Net cash (used in) provided by financing activities of continuing operations
Net Cash Provided by (Used in) Financing Activities
DISCONTINUED OPERATIONS
Net Cash Provided by (Used in) Discontinued Operations [Abstract]
Operating activities
Cash Provided by (Used in) Operating Activities, Discontinued Operations
Investing activities
Cash Provided by (Used in) Investing Activities, Discontinued Operations
Net Cash Provided by (Used in) Discontinued Operations
Net Cash Provided by (Used in) Discontinued Operations
Effect of exchange rate changes on cash and cash equivalents
Effect of Exchange Rate on Cash and Cash Equivalents
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS
Cash and Cash Equivalents, Period Increase (Decrease)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR
Cash and Cash Equivalents, at Carrying Value
CASH AND CASH EQUIVALENTS, END OF YEAR
ensco 91 [Member]
ensco 91 [Member]
ensco 91 [Member]
Continuing Operations [Member]
Continuing Operations [Member]
Discontinued Operations [Member]
Discontinued Operations [Member]
Rig Enhancement Projects [Member]
Rig Enhancement Projects [Member]
Rig Enhancement Projects [Member]
ENSCO DS-2 [Member]
ENSCO DS-2 [Member]
ENSCO DS-2 [Member]
Equipment By Name [Axis]
Equipment By Name [Axis]
Equipment By Name [Axis]
Equipment By Name [Domain]
Equipment By Name [Domain]
Equipment By Name [Domain]
Premium Jackup Rigs [Member]
Premium Jackup Rigs [Member]
Premium Jackup Rigs [Member]
Impaired Long-Lived Assets Held and Used, Asset Description
Impaired Long-Lived Assets Held and Used, Asset Description
Increase in drilling rigs and equipment
Property, Plant and Equipment, Gross, Period Increase (Decrease)
Assets held for sale
Disposal Group, Including Discontinued Operation, Assets, Current
Impairment of Long-Lived Assets to be Disposed of
Impairment of Long-Lived Assets to be Disposed of
Number of Rigs Committed to be Sold
Number of Rigs Committed to be Sold
Number of Rigs Committed to be Sold
Number Of Additional Rigs Committed To Be Sold
Number Of Additional Rigs Committed To Be Sold
Number Of Additional Rigs Committed To Be Sold
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Intrinsic value of options exercised during the year (in millions)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments, Gain (Loss) By Hedging Relationship, By Income Statement Location, By Derivative Instrument Risk [Table]
Derivative Instruments, Gain (Loss) [Table]
Contract Drilling [Member]
Contract Drilling [Member]
Contract Drilling [Member]
Depreciation Expense [Member]
Depreciation Expense [Member]
Depreciation Expense [Member]
Major Types of Debt and Equity Securities [Axis]
Major Types of Debt and Equity Securities [Axis]
Major Types of Debt and Equity Securities [Domain]
Major Types of Debt and Equity Securities [Domain]
Foreign Exchange [Member]
Foreign Exchange [Member]
Derivative Instrument Risk [Axis]
Derivative Instrument [Axis]
Derivative Contract Type [Domain]
Derivative Contract [Domain]
Foreign Currency Derivative [Member]
Foreign Exchange Contract [Member]
Foreign Exchange Forward [Member]
Foreign Exchange Forward [Member]
Derivative Instruments, Gain (Loss) by Hedging Relationship [Axis]
Hedging Relationship [Axis]
Hedging Relationship [Domain]
Hedging Relationship [Domain]
Cash Flow Hedges [Member]
Cash Flow Hedging [Member]
Hedging Designation [Axis]
Hedging Designation [Axis]
Hedging Designation [Domain]
Hedging Designation [Domain]
Designated as Hedging Instrument [Member]
Designated as Hedging Instrument [Member]
Not Designated as Hedging Instrument [Member]
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net
Derivative Assets (Liabilities), at Fair Value, Net
Maximum maturity period for all derivatives
Derivative, Higher Remaining Maturity Range
Aggregate cash flow hedges outstanding
Aggregate cash flow hedges outstanding
Aggregate cash flow hedges outstanding
British pounds
British Pounds Hedges Outstanding
British pounds hedges outstanding
Brazilian reais
Brazilian Reals Hedges Outstanding
Brazilian Reals Hedges Outstanding
Singapore dollars
Singapore Dollars Hedges Outstanding
Singapore dollars hedges outstanding
Australian dollars
Australian Dollars Hedges Outstanding
Australian dollars hedges outstanding
Euros
Euros Hedges Outstanding
Euros Hedges Outstanding
Indonesian rupiah
Indonesian Rupiah Hedges Outstanding
Indonesian Rupiah Hedges Outstanding
Swiss francs
Swiss Francs Hedges Outstanding
Swiss Francs Hedges Outstanding
Mexican Pesos Hedges Outstanding
Mexican Pesos Hedges Outstanding
Mexican Pesos Hedges Outstanding
Other currencies
Other Currencies Hedges Outstanding
Other currencies hedges outstanding
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net
Net gains on derivatives not designated as hedging instruments
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net
Interest Rate Lock Contracts [Member]
Interest Rate Contract [Member]
Foreign Currency Forward Contracts [Member]
Derivative [Line Items]
Derivative [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivatives (Effective Portion)
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net
Income (Loss) from Continuing Operations Attributable to Parent
Income (Loss) from Continuing Operations Attributable to Parent
Other Preferred Stock Dividends and Adjustments
Other Preferred Stock Dividends and Adjustments
Income (Loss) from Continuing Operations Attributable to Parent, Available to Common Stockholders
Income (Loss) from Continuing Operations Attributable to Parent, Available to Common Stockholders
Income (Loss) from Continuing Operations Attributable to Parent, Available to Common Stockholders
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Non-vested as of December 31, 2011, Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Non-vested Granted, Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period
Non-vested Vested, Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period
Non-vested Forfeited, Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Non-vested as of December 31, 2012, Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Non-vested as of December 31, 2011, Weighted-Average Grant-Date Fair Value
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Non-vested Granted, Weighted-Average Grant-Date Fair Value
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Non-vested Vested, Weighted-Average Grant-Date Fair Value
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value
Non-vested Forfeited, Weighted-Average Grant-Date Fair Value
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value
Non-vested as of December 31, 2012, Weighted-Average Grant-Date Fair Value
Net unrealized gains to be reclassified to contract drilling expense
Net Unrealized Gains (Losses) To Be Reclassified To Contract Drilling Expense
Net Unrealized Gains (Losses) To Be Reclassified To Contract Drilling Expense
Net realized gains to be reclassified to depreciation expense
Net Realized Gains To Be Reclassified To Depreciation Expense
Net Realized Gains To Be Reclassified To Depreciation Expense
Net realized (losses) to be reclassified to interest expense
Net Realized Losses To Be Reclassified To Interest Expense
Net Realized Losses To Be Reclassified To Interest Expense
Net gains to be reclassified to earnings
Net Gains (Losses) To Be Reclassified To Earnings
Net Gains (Losses) To Be Reclassified To Earnings
Geographic Areas [Member]
Geographic Areas [Member]
Geographic Areas [Member]
Geographical [Axis]
Geographical [Axis]
Geographical [Domain]
Geographical [Domain]
United States [Member]
UNITED STATES
Brazil [Member]
BRAZIL
Angola [Member]
ANGOLA
Other countries [Member]
Other Countries [Member]
Other Countries [Member]
Long-lived Assets
Commitments and Contingencies Disclosure [Abstract]
Loss Contingencies [Table]
Loss Contingencies [Table]
Legal Entity [Axis]
Legal Entity [Axis]
Entity [Domain]
Entity [Domain]
Petrobras [Member]
Petrobras [Member]
Petrobras [Member]
Disposal Group Name [Axis]
Disposal Group Name [Axis]
Disposal Groups, Including Discontinued Operations, Name [Domain]
Disposal Group Name [Domain]
Ensco 29 [Member]
ENSCO 29 [Member]
ENSCO 29 [Member]
ENSCO DS-5 [Member]
ENSCO DS-5 [Member]
ENSCO DS-5 [Member]
Oil and Gas Delivery Commitments and Contracts [Line Items]
Oil and Gas Delivery Commitments and Contracts [Line Items]
Aggregate Contractual Capital Commitments Due In One Year
Aggregate Contractual Capital Commitments Due In One Year
Aggregate contractual capital commitments due in one year.
Rental expenses
Operating Leases, Rent Expense
2016
Operating Leases, Future Minimum Payments Due, Next Twelve Months
2017
Operating Leases, Future Minimum Payments, Due in Two Years
2018
Operating Leases, Future Minimum Payments, Due in Three Years
2019
Operating Leases, Future Minimum Payments, Due in Four Years
2020
Operating Leases, Future Minimum Payments, Due in Five Years
Thereafter
Operating Leases, Future Minimum Payments, Due Thereafter
Distance from original drilling location in miles
Distance From Original Drilling Location
Distance from original drilling location
Wreckage and debris removal receivables
Wreckage And Debris Removal Receivables
Wreckage And Debris Removal Receivables
Liability insurance self-insured retention per occurrence
Liability Insurance Self Insured Retention Per Occurrence
Liability insurance self insured retention per occurrence
Annual liability coverage limit for wreckage and debris removal costs
Liability Coverage Limit Wreckage And Debris Removal Costs
Liability coverage limit wreckage and debris removal costs
Damages sought
Loss Contingency, Damages Sought, Value
Civil litigation claim damages for cost of repairs and business interruption due to pipeline rupture
Civil Litigation Damages Pipeline Rupture
Civil litigation damages pipeline rupture
Litigation Settlement, Amount
Legal Fees
Legal Fees
Estimated Litigation Liability
Estimated Litigation Liability
Litigation Settlement, Amount to be Paid by Underwriters
Litigation Settlement, Amount to be Paid by Underwriters
Litigation Settlement, Amount to be Paid by Underwriters
Liability insurance self-insured retention
Liability Insurance Self Insured Retention Per Multiple Occurrence
Liability insurance self insured retention per multiple occurrence
Number of occurrences
Number of Occurrences
Number of Occurrences
Liability insurance self-insured retention for each occurrence thereafter
Liability Insurance Self Insured Retention For Each Occurrence Thereafter
Liability Insurance Self Insured Retention For Each Occurrence Thereafter
Number of plaintiffs
Number Of Plaintiffs
Number of plaintiffs
Loss Contingency, Claims Settled, Number
Loss Contingency, Claims Settled, Number
Letters of Credit Outstanding, Amount
Letters of Credit Outstanding, Amount
Derivative Instruments
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Description Of The Business And Summary Of Significant Accounting Policies
Business Description and Accounting Policies [Text Block]
Noncontrolling Interest Disclosure [Text Block]
Noncontrolling Interest Disclosure [Text Block]
Accounts Receivable, Net
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Other Current Assets
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
Other Assets, Net
Schedule of Other Assets [Table Text Block]
Accrued Liabilities And Other
Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block]
Other Liabilities
Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Noncurrent [Text Block]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Repair And Maintenance Expense Related To Continuing Operations
Repair And Maintenance Expense [Table Text Block]
Repair and maintenance expense [Table Text Block]
Schedule of Cash Flows Information
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
Cash Paid For Interest And Income Taxes
Cash Paid For Interest And Income Taxes [Table Text Block]
Cash paid for interest and income taxes [Table Text Block]
Revenue from External Customers by Products and Services [Table Text Block]
Revenue from External Customers by Products and Services [Table Text Block]
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Defined Benefit Plans and Other Postretirement Benefit Plans [Domain]
Defined Benefit Plan and Other Postretirement Benefit Plan [Domain]
Supplemental Executive Retirement Plans [Member]
Supplemental Employee Retirement Plan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in unrealized gains (losses) included in other income
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)
Business
Nature of Operations [Text Block]
Redomestication
Redomestication [Policy Text Block]
Redomestication [Policy Text Block]
Basis Of Presentation-U.K. Companies Act 2006 Section 435 Statement
Basis Of Presentation Certain Company Acts [Policy Text Block]
Basis Of Presentation Certain Company Acts [Policy Text Block]
Principles Of Consolidation
Consolidation, Policy [Policy Text Block]
Cash Equivalents And Short-Term Investments
Cash Equivalents And Short Term Investments [Policy Text Block]
Cash Equivalents And Short Term Investments [Policy Text Block]
Pervasiveness Of Estimates
Pervasiveness Of Estimates [Policy Text Block]
Pervasiveness Of Estimates [Policy Text Block]
Foreign Currency Remeasurement And Translation
Foreign Currency Transactions and Translations Policy [Policy Text Block]
Property And Equipment
Property, Plant and Equipment, Policy [Policy Text Block]
Goodwill
Goodwill and Intangible Assets, Policy [Policy Text Block]
Operating Revenues And Expenses
Operating Revenues and Expenses [Policy Text Block]
Operating Revenues and Expenses [Policy Text Block]
Derivative Instruments
Derivatives, Policy [Policy Text Block]
Income Taxes
Income Tax, Policy [Policy Text Block]
Share-Based Compensation
Compensation Related Costs, Policy [Policy Text Block]
Fair Value Measurements
Fair Value of Financial Instruments, Policy [Policy Text Block]
Earnings Per Share
Earnings Per Share, Policy [Policy Text Block]
Supplemental Information For Property, Casualty Insurance Underwriters [Table]
Supplemental Information for Property, Casualty Insurance Underwriters [Table]
Accounts, Notes, Loans and Financing Receivable by Receivable Type [Axis]
Receivable Type [Axis]
Receivable Type [Domain]
Receivable [Domain]
Trade [Member]
Trade Accounts Receivable [Member]
Other Credit Derivatives [Member]
Other Credit Derivatives [Member]
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Accounts receivable
Accounts Receivable, Gross, Current
Allowance for doubtful accounts
Allowance for Doubtful Accounts Receivable, Current
Accounts receivable, net
Receivables, Net, Current
Guarantees [Abstract]
Schedule of Guarantor Obligations [Table]
Schedule of Guarantor Obligations [Table]
Ensco Plc [Member]
Ensco Plc [Member]
Ensco Plc [Member]
ENSCO International Inc. [Member]
Ensco International Inc [Member]
Ensco International Inc [Member]
Pride International Inc. [Member]
Pride International Inc Member
Pride International Inc [Member]
Other Non-Guarantor Subsidiaries Of Ensco [Member]
Other Non Guarantor Subsidiaries Member
Other non-guarantor subsidiaries [Member].
Consolidating Adjustments [Member]
Consolidated Adjustments Member
Consolidated adjustments [Member].
Guarantor Obligations [Line Items]
Guarantor Obligations [Line Items]
Payments for (Proceeds from) Other Investing Activities
Payments for (Proceeds from) Other Investing Activities
Payments of Debt Extinguishment Costs
Advances (to) from affiliates
Payments for Advance to Affiliate
Net cash provided by discontinued operations
DISCONTINUED OPERATIONS, NET
Gains (Losses) on Extinguishment of Debt
Settlement of warranty or other claims
Settlement of warranty or other claims
Settlement of warranty or other claims
Other Noncash Income (Expense)
Increase (Decrease) in Other Operating Assets and Liabilities, Net
(Loss) income from discontinued operations
Income from discontinued operations attributable to noncontrolling interests
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest
(Loss) income from discontinued operations attributable to Ensco
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent
Repair and maintenance expense
Cost of Property Repairs and Maintenance
Guarantee Of Registered Securities
Guarantees [Text Block]
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-term Debt Instruments [Table]
Five Point Two Percent Senior Notes [Member]
6.36% MARAD bonds due 2015 [Member]
4.65% MARAD bonds due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Total
Debt and Capital Lease Obligations
Less current maturities
Debt, Current
Total long-term debt
Long-term Debt, Excluding Current Maturities
Debt instrument interest rate stated percentage
Segment Information
Segment Reporting Disclosure [Text Block]
Reconciliation Of Net Income Attributable To Ensco Shares Used In Basic And Diluted EPS Computations
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Reconciliation Of The Weighted-Average Shares Used In Basic And Diluted Earnings Per Share Computations
Schedule of Weighted Average Number of Shares [Table Text Block]
Schedule Of Income From Continuing Operations Attributable To Ensco
Reconciliation Of Income From Continuing Operations [Table Text Block]
Reconciliation Of Income From Continuing Operations [Table Text Block]
Reconciliation of Income (Loss) from Discontinued Operations [Table Text Block]
Reconciliation of Income (Loss) from Discontinued Operations [Table Text Block]
[Table Text Block] for Reconciliation of Income (Loss) from Discontinued Operations [Table]
(Increase) decrease in other assets
Increase (Decrease) in Other Operating Assets
(Decrease) increase in liabilities
Increase (Decrease) in Other Operating Liabilities
(Increase) decrease in accounts receivable
Increase (Decrease) in Accounts Receivable
Changes in operating assets and liabilities
Sale Leaseback [Abstract]
Sale Leaseback [Abstract]
Sale Leaseback Transaction Disclosure [Text Block]
Sale Leaseback Transaction Disclosure [Text Block]
Discontinued Operations and Disposal Groups [Abstract]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Table]
Disposal Groups, Including Discontinued Operations [Table]
ENSCO 69 And Wisconsin [Member]
ENSCO 69 And Wisconsin [Member]
ENSCO 69 And Wisconsin [Member]
ENSCO 93 [Member]
Ensco 93 [Member]
Ensco 93 [Member]
ENSCO 85 [Member]
ENSCO 85 [Member]
ENSCO 85 [Member]
ENSCO 5002 [Member]
ENSCO 5002 [Member] [Member]
ENSCO 5002 [Member] [Member]
ENSCO 5001 [Member]
ENSCO 5001 [Member]
ENSCO 5001 [Member]
Pride Pennsylvania Rig [Member]
Pride Pennsylvania Rig [Member]
Pride Pennsylvania Rig [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations, Income Tax Expense (Benefit), Discrete Item
Discontinued Operations, Income Tax Expense (Benefit), Discrete Item
Discontinued Operations, Income Tax Expense (Benefit), Discrete Item
Impairment of Long-Lived Assets to be Disposed of, Net of Tax Benefit
Impairment of Long-Lived Assets to be Disposed of, Net of Tax Benefit
Impairment of Long-Lived Assets to be Disposed of, Net of Tax Benefit
Impairment of Long-Lived Assets to be Disposed of, Tax Benefit
Impairment of Long-Lived Assets to be Disposed of, Tax Benefit
Impairment of Long-Lived Assets to be Disposed of, Tax Benefit
Pre-tax Gain/(Loss)
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax
Impairment charge for asset write down
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down
Credit Facility [Axis]
Credit Facility [Axis]
Credit Facility [Domain]
Credit Facility [Domain]
Revolving Credit Facility [Member]
Revolving Credit Facility [Member]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Domain]
Long-term Debt, Type [Domain]
Bonds [Member]
Bonds [Member]
Acquired Debt [Member]
Acquired Debt [Member]
Acquired Debt [Member]
Senior Notes [Member]
Senior Notes [Member]
Extinguishment of Debt [Axis]
Extinguishment of Debt [Axis]
Extinguishment of Debt, Type [Domain]
Extinguishment of Debt, Type [Domain]
TenderOffer [Member]
TenderOffer [Member]
TenderOffer [Member]
Variable Rate [Axis]
Variable Rate [Axis]
Variable Rate [Domain]
Variable Rate [Domain]
Base Rate [Member]
Base Rate [Member]
London Interbank Offered Rate (LIBOR) [Member]
London Interbank Offered Rate (LIBOR) [Member]
Five Year Credit Facility Member
Five year credit facility [Member]
Five year credit facility [Member]
Five Point Seven Five Percent Senior Notes Member [Domain]
Five Point Seven Five Percent Senior Notes Member [Domain]
Five Point Seven Five Percent Senior Notes Member [Domain]
Three Point Two Five Percent Senior Notes Member
Three Point Two Five Percent Senior Notes Member
Three Point Two Five Percent Senior Notes [Member]
Four Point Three Three Percent and Four Point Six Five Percent Maritime Administration Bonds [Member]
Four Point Three Three Percent and Four Point Six Five Percent Maritime Administration Bonds [Member]
Four Point Three Three Percent and Four Point Six Five Percent Maritime Administration Bonds [Member]
Four Point Three Three Percent Marine Administration Bonds Including Current Maturities Member
Four Point Three Three Percent Marine Administration Bonds Including Current Maturities Member
Four Point Three Three Percent Marine Administration Bonds Including Current Maturities [Member]
Four Point Six Five Percent Marine Administration Bonds Including Current Maturities Member
Four Point Six Five Percent Marine Administration Bonds Including Current Maturities Member
Four Point Six Five Percent Marine Administration Bonds Including Current Maturities [Member]
ENSCO 7500 [Member]
Ensco7500 [Member]
ENSCO 7500 [Member]
ENSCO 105 [Member]
Ensco105 [Member]
ENSCO 105 [Member]
Assets Sold under Agreements to Repurchase [Axis]
Securities or Other Assets Sold under Agreements to Repurchase [Axis]
Assets Sold under Agreements to Repurchase, Type [Domain]
Assets Sold under Agreements to Repurchase, Type [Domain]
Commercial Paper Program [Member]
Commercial Paper [Member]
Debentures Due 2027 [Member]
Debentures Due2027 [Member]
Debentures Due 2027 [Member]
Debt Instrument, Face Amount
Debt Instrument, Face Amount
Senior Note Maturity Year
Senior Note Maturity Year
Senior Note Maturity Year
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage
Unsecured debt instruments issued
Notes Issued
Debt Instrument, Redemption Price, Percentage
Debt Instrument, Redemption Price, Percentage
Commercial paper, capacity
Commercial Paper, Capacity
Commercial Paper, Capacity
Current borrowing capacity
Line of Credit Facility, Current Borrowing Capacity
Debt Instrument, Basis Spread on Variable Rate, Effect of One Notch Change in Rating
Debt Instrument, Basis Spread on Variable Rate, Effect of One Notch Change in Rating
Debt Instrument, Basis Spread on Variable Rate, Effect of One Notch Change in Rating
Line of Credit Facility, Commitment fee Percentage, Effect of One Notch Change in Rating
Line of Credit Facility, Commitment fee Percentage, Effect of One Notch Change in Rating
Line of Credit Facility, Commitment fee Percentage, Effect of One Notch Change in Rating
Maximum Percent of Debt to Total Capitalization Ratio
Maximum Percent of Debt to Total Capitalization Ratio
Maximum Percent of Debt to Total Capitalization Ratio
Aggregate amount of unsecured debt instrument
Long-term Debt, Gross
Discount to senior notes
Debt Instrument, Unamortized Discount (Premium), Net
Number of semiannual principal installments
Number Of Semiannual Principal Installments
Number of semiannual principal installments.
Semiannual principal installment amount
Semiannual Principal Installment Amount
Semiannual principal installment amount.
Maximum days of maturity of notes
Maximum Days Of Maturity Of Notes
Maximum Days Of Maturity Of Notes
Commercial paper
Commercial Paper
Debt instrument maturity term, years
Debt Instrument Maturity Term Years
Debt Instrument Maturity Term Years
Debt Instrument, Repurchased Face Amount
Debt Instrument, Repurchased Face Amount
Debt Instrument, Repurchase Amount
Debt Instrument, Repurchase Amount
Gains (Losses) on Extinguishment of Debt, before Write off of Deferred Debt Issuance Cost
Gains (Losses) on Extinguishment of Debt, before Write off of Deferred Debt Issuance Cost
Amortization of Debt Discount (Premium)
Amortization of Debt Discount (Premium)
Write off of Deferred Debt Issuance Cost
Write off of Deferred Debt Issuance Cost
Total facility fee commitment
Long-term Line of Credit
Maximum amount of right to increase the commitment
Line of Credit Facility, Maximum Borrowing Capacity
Maximum percentage of debt to total capitalization ratio
Maximum Percentage Of Debt To Total Capitalization Ratio
Maximum Percentage Of Debt To Total Capitalization Ratio
Amounts outstanding
Basis spread on variable rate
Debt Instrument, Basis Spread on Variable Rate
Line of Credit Facility, Commitment Fee Percentage
Line of Credit Facility, Commitment Fee Percentage
Debt instrument maturity period
Weighted-average interest rate
Short-term Debt, Weighted Average Interest Rate
Net unamortized premiums
Debt Instrument, Unamortized Premium
Interest Expense
Capitalized interest
Interest Costs Capitalized
Line of Credit Facility, Fair Value of Amount Outstanding
Line of Credit Facility, Fair Value of Amount Outstanding
OTHER (EXPENSE) INCOME, NET
EQUITY EARNINGS IN AFFILIATES, NET OF TAX
Income (Loss) from Equity Method Investments
Statement of Comprehensive Income [Abstract]
NET INCOME
OTHER COMPREHENSIVE INCOME (LOSS), NET
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net change in fair value of derivatives
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax
Reclassification of gains and losses on derivative instruments from other comprehensive (income) loss into net income
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax
Other
Accumulated Other Comprehensive Income, Gains And Losses On Derivative Instruments, Other
Accumulated Other Comprehensive Income, Gains And Losses On Derivative Instruments, Other
NET OTHER COMPREHENSIVE INCOME (LOSS)
Other Comprehensive Income (Loss), Net of Tax
COMPREHENSIVE INCOME
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Stockholders' Equity Note [Abstract]
Shareholders' Equity
Shareholders' Equity and Share-based Payments [Text Block]
Income Taxes
Income Tax Disclosure [Text Block]
Property, Plant and Equipment [Table]
ENSCO DS-10 [Member]
ENSCO DS-10 [Member]
ENSCO DS-10 [Member]
ENSCO 123 [Member]
ENSCO 123 [Member]
ENSCO 123 [Member]
ENSCO 140 [Member]
ENSCO 140 [Member]
ENSCO 140 [Member]
ENSCO 141 [Member]
ENSCO 141 [Member]
ENSCO 141 [Member]
Cumulative Paid
Capital Commitments Paid to Date
Capital Commitments Paid to Date
2016
2017
Aggregate Contractual Capital Commitments Due In Two Years
Aggregate contractual capital commitments due in two years.
2018
Aggregate Contractual Capital Commitments Due In Three Years
Aggregate contractual capital commitments due in three years.
Total
Total Aggregate Contractual Capital Commitments
Total aggregate contractual capital commitments.
Discontinued Operations
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]
Provision for income taxes
Income from continuing operations
Continuing operations
Income (Loss) from Continuing Operations, Per Basic and Diluted Share
Discontinued operations
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic and Diluted Share
Total earnings per share - basic
Earnings Per Share, Basic and Diluted
Schedule Of Derivatives At Fair Value
Schedule of Derivative Instruments [Table Text Block]
Gains And Losses On Derivatives Designated As Cash Flow Hedges
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Schedule Of Estimated Amount Of Net Gains Associated With Derivatives
Schedule Of Estimated Amount Of Net Gains Associated With Derivatives [Table Text Block]
Schedule Of Estimated Amount Of Net Gains Associated With Derivatives [Table Text Block]
Statement, Equity Components [Axis]
Equity Components [Axis]
Equity Component [Domain]
Equity Component [Domain]
Common Stock [Member]
Common Stock [Member]
Additional Paid-In Capital [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Retained Earnings [Member]
AOCI [Member]
AOCI Attributable to Parent [Member]
Treasury Shares [Member]
Treasury Stock [Member]
Noncontrolling Interest [Member]
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
BALANCE, shares
Shares, Issued
BALANCE
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest
Cash dividends paid
Dividends, Common Stock, Cash
Distributions to noncontrolling interests
Payments of Ordinary Dividends, Noncontrolling Interest
Shares issued under share-based compensation plans, net, shares
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures
Shares issued under share-based compensation plans, net
Shares Issued Under Share Based Compensation Plans Net
Shares issued under share-based compensation plans, net
Equity financing costs
Payments of Stock Issuance Costs
Tax benefit (deficiency) from share-based compensation
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation
Repurchase of shares
Stock Repurchased During Period, Value
Share-based compensation cost
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition
Net other comprehensive income (loss)
BALANCE, shares
BALANCE
Intangible assets
Finite-Lived Intangible Assets, Net
Unbilled reimbursable receivables
Accounts Receivable, Net, Noncurrent
Prepaid taxes on intercompany transfers of property
Prepaid Expense Other, Noncurrent
Supplemental executive retirement plan assets
Assets Held-in-trust, Noncurrent
Contracts Receivable, Claims and Uncertain Amounts
Contracts Receivable, Claims and Uncertain Amounts
Deferred mobilization costs
Deferred Costs, Noncurrent
Deferred tax assets
Other
Assets Noncurrent Other
Assets Noncurrent Other
Other assets, net
Other Assets, Noncurrent
Benefit Plans
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Summary Of Non-Vested Share Award Related Compensation Expense Recognized
Schedule Of Summary Of Non-Vested Share Award Related Compensation Expense Recognized [Table Text Block]
Schedule Of Summary Of Non-Vested Share Award Related Compensation Expense Recognized [Table Text Block]
Summary Of Value Of Non-Vested Share Awards Granted And Vested
Schedule Of Summary Of Value Of Non-Vested Share Awards Granted And Vested [Table Text Block]
Schedule Of Summary Of Value Of Non-Vested Share Awards Granted And Vested [Table Text Block].
Summary Of Non-Vested Share Award Activity
Schedule Of Summary Of Non-Vested Share Award Activity [Table Text Block]
Schedule Of Summary Of Non-Vested Share Award Activity [Table Text Block].
Deferred revenue
Deferred Revenue, Noncurrent
Intangible liabilities
Intangible Liabilities Noncurrent
Intangible Liabilities Noncurrent
Unrecognized tax benefits (inclusive of interest and penalties)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued
Supplemental executive retirement plan liabilities
Supplemental Executive Retirement Plan Liabilities
Supplemental Executive Retirement Plan Liabilities
Personnel costs
Other Employee Related Liabilities
Other Accrued Liabilities, Noncurrent
Other Accrued Liabilities, Noncurrent
Other liabilities
Other Liabilities, Noncurrent
8.50% Senior Notes Due 2019 [Member]
Eight Point Five Zero Percent Senior Notes Member
Eight Point Five Zero Percent Senior Notes [Member]
7.875% Senior Notes Due 2040 [Member]
Seven Point Eight Seven Five Percent Senior Notes Member
Seven Point Eight Seven Five Percent Senior Notes [Member]
Senior notes aggregate outstanding principal balance
Senior Notes
Stock Repurchase Program, Authorized Amount
Stock Repurchase Program, Authorized Amount
Stock Repurchase Program, Number of Shares Authorized to be Repurchased
Stock Repurchase Program, Number of Shares Authorized to be Repurchased
Stock Repurchased During Period, Shares
Stock Repurchased During Period, Shares
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table]
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table]
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis]
General And Administrative [Member]
General and Administrative Expense [Member]
Operating Expenses [Member]
Operating Expenses [Member]
Operating Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Option related compensation expense
Option Related Compensation Expense
Option related compensation expense.
Tax benefit
Option Related Tax Benefit
Option related tax benefit.
Total option related compensation expense included in net income
Option Related Compensation expense Net Of Tax
Option related compensation expense net of tax.
Commitments And Contingencies
Commitments and Contingencies Disclosure [Text Block]
Income (Loss) from Continuing Operations, Portion Attributable to Noncontrolling Interest
Income (Loss) from Continuing Operations, Portion Attributable to Noncontrolling Interest
Income (Loss) from Continuing Operations, Portion Attributable to Noncontrolling Interest
Income from continuing operations attributable to Ensco
Schedule Of Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments
Fair Value, by Balance Sheet Grouping [Table Text Block]
Goodwill and Other Intangible Assets and Liabilities
Goodwill and Intangible Assets Disclosure [Text Block]
Balance, beginning of year
Increases in unrecognized tax benefits as a result of tax positions taken during prior years
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions
Increases in unrecognized tax benefits as a result of tax positions taken during the current year
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions
Decreases in unrecognized tax benefits as a result of tax positions taken during prior years
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions
Settlements with taxing authorities
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities
Lapse of applicable statutes of limitations
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations
Impact of foreign currency exchange rates
Unrecognized Tax Benefits Foreign Currency Translation Gain Loss Arising During Period
Unrecognized tax benefits foreign currency translation gain (loss) arising during period.
Balance, end of year
Schedule of Property, Plant and Equipment [Table]
Asia Pacific, Europe and Mediterranean, Middle East and Africa and North and South America [Member]
Asia Pacific, Europe and Mediterranean, Middle East and Africa and North and South America [Member]
Asia Pacific, Europe and Mediterranean, Middle East and Africa and North and South America [Member]
Singapore [Member]
SINGAPORE
Jackups [Member]
Dynamically Positioned Semisubmersible [Member]
Dynamically Positioned Semisubmersible [Member]
Dynamically Positioned Semisubmersible [Member]
Ultra-Deepwater [Member]
Ultra Deepwater [Member]
Ultra Deepwater [Member]
Asset under Construction [Member]
Asset under Construction [Member]
Number of drillships
Number Of Drillships
Number of drillships.
Number of drilling management contracts
Number of Drilling Management Contracts
Number of Drilling Management Contracts
Condensed Consolidating Statements Of Income
Schedule of Condensed Consolidated Statements of Income [Table Text Block]
Schedule of condensed consolidated statements of income [Table Text Block].
Schedule of Condensed Consolidated Statements of Comprehensive Income
Schedule of Condensed Consolidated Statements of Comprehensive Income [Table Text Block]
Schedule of Condensed Consolidated Statements of Comprehensive Income [Table Text Block]
Condensed Consolidating Balance Sheets
Schedule of Condensed Consolidated Balance Sheet [Table Text Block]
Schedule of condensed consolidated balance sheet [Table Text Block]
Condensed Consolidating Statements Of Cash Flows
Schedule of Condensed Consolidated Statements of Cash Flows [Table Text Block]
Schedule of condensed consolidated statements of cash flows [Table Text Block]
Inventory
Inventory, Net
Prepaid taxes
Prepaid Taxes
Deferred Tax Assets, Net, Current
Deferred Tax Assets, Net, Current
Deferred mobilization costs
Other Deferred Costs, Net
Prepaid expenses
Other Prepaid Expense, Current
Derivative assets
Derivative Asset, Current
Deferred tax assets
Other
Assets Current Other
Assets Current Other
Other current assets
Other Assets, Current
Revenue from External Customers by Products and Services [Table]
Revenue from External Customers by Products and Services [Table]
Customer [Axis]
Customer [Axis]
Customer [Domain]
Customer [Domain]
BP [Member]
BP [Member]
BP [Member]
TOTAL [Member]
TOTAL [Member]
TOTAL [Member]
Other Customers [Member]
Other Customers [Member]
Other Customers [Member]
Concentration Risk Type [Axis]
Concentration Risk Type [Axis]
Concentration Risk Type [Domain]
Concentration Risk Type [Domain]
Customer Concentration Risk [Member]
Customer Concentration Risk [Member]
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Domain]
Concentration Risk Benchmark [Domain]
Sales Revenue, Services, Net [Member]
Sales Revenue, Services, Net [Member]
Revenue from External Customer [Line Items]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage
Concentration Risk, Percentage
Schedule Of Segment Reporting Information
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Schedule Of Geographic Distribution Of Rigs By Segment
Schedule Of Segment Reporting Information By Geographical Segment [Table Text Block]
Schedule of segment reporting information by geographical segment [Table Text Block].
Schedule Of Revenues And Long-Lived Assets By Geographical Segment
Long-lived Assets by Geographic Areas [Table Text Block]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Foreign Currency Forward Contracts - Current [Member]
Foreign Currency Forward Contracts Current Member
Foreign Currency Forward Contracts Current [Member]
Foreign Currency Forward Contracts - Non-Current [Member]
Foreign Currency Forward Contracts Noncurrent Member
Foreign Currency Forward Contracts Noncurrent [Member]
Total fair value of derivative assets
Derivative Asset, Fair Value, Gross Asset
Total fair value of derivative liabilities
Derivative Liability, Fair Value, Gross Liability
Sale Leaseback Transaction [Table]
Sale Leaseback Transaction [Table]
ENSCO 83, 89, 93 and 98 [Member]
ENSCO 83, 89, 93 and 98 [Member]
ENSCO 83, 89, 93 and 98 [Member]
Sale Leaseback Transaction [Line Items]
Sale Leaseback Transaction [Line Items]
Proceeds from Sale of Other Property, Plant, and Equipment
Proceeds from Sale of Other Property, Plant, and Equipment
Sales Commissions and Fees
Sales Commissions and Fees
Sale Leaseback Transaction, Net Book Value
Sale Leaseback Transaction, Net Book Value
Gain (Loss) on Disposition of Property Plant Equipment
Gain (Loss) on Disposition of Property Plant Equipment
Sale Leaseback Transaction, Deferred Gain, Net
Sale Leaseback Transaction, Deferred Gain, Net
Deferred Gain on Sale of Property
Deferred Gain on Sale of Property
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax
Capital Commitments
Schedule of Construction Commitments [Table Text Block]
Schedule of Construction Commitments [Table Text Block]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding as of December 31, 2011, Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number
Granted, Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures
Exercised, Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period
Forfeited, Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period
Expired, Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period
Outstanding as of December 31, 2012, Shares
Exercisable as of December 31, 2012, Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding as of December 31, 2011, Weighted-Average Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price
Granted, Weighted-Average Exercise Price
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price
Exercised, Weighted-Average Exercise Price
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price
Forfeited, Weighted-Average Exercise Price
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price
Expired, Weighted-Average Exercise Price
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price
Outstanding as of December 31, 2012, Weighted-Average Exercise Price
Exercisable as of December 31, 2012, Weighted-Average Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price
Outstanding as of December 31, 2012, Weighted Average Contractual Term
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term
Exercisable as of December 31, 2012, Weighted-Average Contractual Term
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term
Outstanding as of December 31, 2012, Intrinsic Value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value
Exercisable as of December 31, 2012, Intrinsic Value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value
Revenues
Disposal Group, Including Discontinued Operation, Revenue
Operating expenses
Disposal Group, Including Discontinued Operation, Operating Expense
Operating (loss) income before income taxes
Disposal Group, Including Discontinued Operation, Operating Income (Loss)
Other income (expense)
Disposal Group, Including Discontinued Operation, Other Income (Loss)
Disposal Group, Including Discontinued Operation, Other Income (Loss)
Income tax benefit
Discontinued Operation, Tax Effect of Income (Loss) from Discontinued Operation During Phase-out Period
Impairment of Long-Lived Assets to be Disposed of, Net of Tax Benefit
Gain on disposal of discontinued operations, net
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax
Statement of Financial Position [Abstract]
Class of Stock [Axis]
Class of Stock [Axis]
Class of Stock [Domain]
Class of Stock [Domain]
Class A Ordinary Shares, U.S. [Member]
Common Class A [Member]
Common Class B, Par Value In GBP [Member]
Common Class B [Member]
Assets [Abstract]
Assets [Abstract]
CURRENT ASSETS
Assets, Current [Abstract]
Cash and cash equivalents
Accounts receivable, net
Other
Total current assets
Assets, Current
PROPERTY AND EQUIPMENT, AT COST
Less accumulated depreciation
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Property and equipment, net
GOODWILL
OTHER ASSETS, NET
TOTAL ASSETS
Assets
LIABILITIES AND SHAREHOLDERS' EQUITY
Liabilities and Equity [Abstract]
Liabilities [Abstract]
Liabilities [Abstract]
CURRENT LIABILITIES
Liabilities, Current [Abstract]
Accounts payable - trade
Accounts Payable, Current
Accrued liabilities and other
Other Liabilities, Current
Short-term debt
Current maturities of long-term debt
Long-term Debt, Current Maturities
Total current liabilities
Liabilities, Current
LONG-TERM DEBT
DEFERRED INCOME TAXES
OTHER LIABILITIES
COMMITMENTS AND CONTINGENCIES
Commitments and Contingencies
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
ENSCO SHAREHOLDERS' EQUITY
Stockholders' Equity Attributable to Parent [Abstract]
Common shares, value
Common Stock, Value, Issued
Additional paid-in capital
Additional Paid in Capital
Retained earnings
Retained Earnings (Accumulated Deficit)
Accumulated other comprehensive income
Treasury shares, at cost, 7.8 million shares and 6.5 million shares as of December 31, 2015 and 2014
Treasury Stock, Value
Total Ensco shareholders' equity
Stockholders' Equity Attributable to Parent
NONCONTROLLING INTERESTS
Stockholders' Equity Attributable to Noncontrolling Interest
Total equity
Total liabilities and shareholders' equity
Liabilities and Equity
Document And Entity Information [Abstract]
Document and Entity Information [Abstract]
Document Type
Document Type
Amendment Flag
Amendment Flag
Document Period End Date
Document Period End Date
Entity Registrant Name
Entity Registrant Name
Entity Central Index Key
Entity Central Index Key
Current Fiscal Year End Date
Current Fiscal Year End Date
Document Fiscal Year Focus
Document Fiscal Year Focus
Document Fiscal Period Focus
Document Fiscal Period Focus
Entity Well-known Seasoned Issuer
Entity Well-known Seasoned Issuer
Entity Voluntary Filers
Entity Voluntary Filers
Entity Current Reporting Status
Entity Current Reporting Status
Entity Filer Category
Entity Filer Category
Entity Public Float
Entity Public Float
Entity Common Shares, Shares Outstanding
Entity Common Stock, Shares Outstanding
U.K. statutory income tax rate
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Goodwill impairment
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Goodwill Impairment Losses, Percent
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Goodwill Impairment Losses, Percent
Assets impairment
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Percent
Non-U.K. taxes
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent
Amortization of deferred charges associated with intercompany rig sales
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amortization, Percent
Redomestication related income taxes
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent
Valuation allowance
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent
Net expense (benefit) in connection with resolutions of tax issues and adjustments relating to prior years
Effective Income Tax Rate Reconciliation, Uncertain Tax Positions and Other Adjustments, Percent
Effective Income Tax Rate Reconciliation, Uncertain Tax Positions and Other Adjustments, Percent
Other
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent
Effective income tax rate
Effective Income Tax Rate Reconciliation, Percent
Common shares, par value
Common Stock, Par or Stated Value Per Share
Common shares, shares authorized
Common Stock, Shares Authorized
Common shares, shares issued
Common Stock, Shares, Issued
Treasury shares, shares held
Treasury Stock, Shares
Plan Name [Axis]
Plan Name [Axis]
Plan Name [Domain]
Plan Name [Domain]
Long-Term Incentive Plan (LTIP) [Member]
Long Term Incentive Plan [Member]
Long-Term Incentive Plan [Member]
Non-Vested Share Awards [Member]
Non Vested Share Awards [Member]
Non-Vested Share Awards [Member]
Share Options Award [Member]
Share Options Award [Member]
Share Options Award [Member]
Exercisable In Increments Over Four-Year Period [Member]
Exercisable In Increments Over Four Year Period [Member]
Exercisable In Increments Over Four-Year Period [Member].
Exercisable In Increments Over Three-Year Period [Member]
Exercisable In Increments Over Three Year Period [Member]
Exercisable In Increments Over Three-Year Period [Member].
Performance Awards [Member]
Performance Awards [Member]
Performance Awards [Member]
Savings Plan [Member]
Savings Plan [Member]
Savings Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance as awards
Common Stock, Capital Shares Reserved for Future Issuance
Share awards, vest rate
Share Based Compensation Arrangement By Share Based Payment Award Award Requisite Service Increment
Share based compensation arrangement by share based payment award requisite service increment.
Unrecognized compensation cost on awards
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized
Recognized compensation cost, weighted-average period, years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition
Share options award, outstanding
Share option awards, exercisable, increment
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period
Performance awards, granted, aggregate grant-date fair value
Performance Awards Granted Aggregate Grant Date Fair Value
Performance awards granted aggregate grant date fair value
Performance awards, vested, aggregate fair value
Share Based Compensation Arrangement By Share Based Payment Award Options Vested Aggregate Fair Value
Share based compensation arrangement by share based payment award options vested aggregate fair value.
Recognized compensation expense
Allocated Share-based Compensation Expense
Employee match
Defined Contribution Plans Employee Contribution Percentage Matched By Employer
Defined contribution plans employee contribution percentage matched by employer.
Maximum percentage of eligible employee compensation to be matched by employer
Defined Contribution Plans Employee Contribution Percentage Of Eligible Compensation Matched By Employer
Defined Contribution Plans Employee Contribution Percentage Of Eligible Compensation Matched By Employer
Total matching contributions
Defined Benefit Plan, Contributions by Employer
Profit sharing contribution provisions
Profit Sharing Contribution Provisions
Profit sharing contribution provisions.
Summary Of Rig Sales and Income From Discontinued Operations
Disposal Groups, Including Discontinued Operations [Table Text Block]
Reconciliation of Revenue from Segments to Consolidated [Table]
Reconciliation of Revenue from Segments to Consolidated [Table]
Us Gulf Of Mexico [Member]
Us Gulf Of Mexico [Member]
Us Gulf Of Mexico [Member]
United Kingdom [Member]
UNITED KINGDOM
Other Geographic Areas [Member]
Other Geographic Areas [Member]
Other Geographic Areas [Member]
Geographic Concentration Risk [Member]
Geographic Concentration Risk [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues
Revenues
Increase (Decrease) in Other Operating Assets and Liabilities, Net
Increase (Decrease) in Other Current Assets and Liabilities, Net
Capital expenditure accruals
Capital Expenditure Accruals
Capital expenditure accruals.
Changes In The Carrying Amount Of Goodwill
Schedule of Goodwill [Table Text Block]
Schedule of Other Intangible Assets and Liabilities
Schedule of Other Intangible Assets and Liabilities [Table Text Block]
Schedule of Other Intangible Assets and Liabilities [Table Text Block]
Schedule of Expected Amortization Income (Expense)
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Fair Value, Hierarchy [Axis]
Fair Value, Hierarchy [Axis]
Fair Value Hierarchy [Domain]
Fair Value Hierarchy [Domain]
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Inputs, Level 1 [Member]
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Inputs, Level 2 [Member]
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Inputs, Level 3 [Member]
Supplemental executive retirement plan assets
Fair Value Measured On Recurring Basis Supplemental Executive Retirement Plan Assets
Fair Value Measured On Recurring Basis Supplemental Executive Retirement Plan Assets
Total financial assets
Total Financial Assets
Total Financial Assets
Financial Liabilities Fair Value Disclosure
Financial Liabilities Fair Value Disclosure
Fair Value Measurements
Fair Value Disclosures [Text Block]
Summary Of Unaudited Quarterly Consolidated Income Statement
Schedule of Quarterly Financial Information [Table Text Block]
Weighted-average shares - basic
Potentially dilutive share options
Weighted Average Number Diluted Shares Outstanding Adjustment
Weighted-average shares - diluted
Middle East, Africa, Asia & Pacific Rim [Member]
Middle East, Africa, Asia & Pacific Rim [Member]
Middle East, Africa, Asia & Pacific Rim [Member]
North & South America (Excluding Brazil) [Member]
North South America Excl Brazil Member
North & south america excl. brazil member.
Europe & Mediterranean [Member]
Europe Mediterranean Member
Europe & mediterranean member.
Asia & Pacific Rim (Under Construction) [Member]
Asia Under Construction Member
Asia - Under Construction [Member]
Middle East Under Construction [Member]
Middle East Under Construction [Member]
Middle East Under Construction [Member]
Middle East & Africa [Member]
Middle East [Member]
Asia & Pacific Rim [Member]
Asia [Member]
Total number of contract drilling rigs
Total Number Of Contract Drilling Rigs
Total Number Of Contract Drilling Rigs
Personnel costs
Employee-related Liabilities, Current
Deferred revenue
Deferred Revenue, Current
Taxes
Taxes Payable, Current
Accrued interest
Interest Payable, Current
Prepayment Liability for Sale of Assets, Current
Prepayment Liability for Sale of Assets, Current
Prepayment Liability for Sale of Assets, Current
Derivative Liability
Derivative Liability
Customer Prepayments, Current
Customer Prepayments, Current
Customer Prepayments, Current
Other
Liabilities Current Other
Liabilities Current Other
Accrued liabilities and other
Short-term Investments
Accounts receivable
Accounts receivable from affiliates
Due from Affiliate, Current
DUE FROM AFFILIATES
Due from Affiliate, Noncurrent
INVESTMENTS IN AFFILIATES
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
TOTAL ASSETS
Accounts payable and accrued liabilities
Accounts Payable and Accrued Liabilities, Current
Accounts payable to affiliates
Due to Affiliate, Current
DUE TO AFFILIATES
Due to Affiliate, Noncurrent
INVESTMENTS IN AFFILIATES
Due to Related Parties, Noncurrent
ENSCO SHAREHOLDERS' EQUITY
Weighted-average grant-date fair value of non-vested share awards granted (per share)
Total fair value of non-vested share awards vested during the period (in millions)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value
ENSCO 5000 [Member]
ENSCO 5000 [Member]
ENSCO 5000 [Member]
Net Book Value
Disposal Group, Including Discontinued Operation, Assets
Disposal Group, Including Discontinued Operation, Gross Profit (Loss)
Disposal Group, Including Discontinued Operation, Gross Profit (Loss)
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Foreign tax credits
Premium on long-term debt
Deferred Tax Assets Premium On Long Term Debt
Deferred Tax Assets Premium On Long Term Debt
Net operating loss carryfowards
Employee benefits, including share-based compensation
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits
Deferred Tax Assets, Deferred Income
Deferred Tax Assets, Deferred Income
Other
Deferred Tax Assets, Other
Total deferred tax assets
Deferred Tax Assets, Gross
Valuation allowance
Deferred Tax Assets, Valuation Allowance
Net deferred tax assets
Deferred Tax Assets, Net of Valuation Allowance
Property and equipment
Deferred Tax Liabilities, Property, Plant and Equipment
Intercompany transfers of property
Deferred Tax Liability Intercompany Property Transfers
Deferred tax liability intercompany property transfers.
Deferred costs
Deferred Tax Liabilities, Deferred Expense
Other
Deferred Tax Liabilities, Other
Total deferred tax liabilities
Deferred Tax Liabilities, Net
Net deferred tax liability
Deferred Income Tax Assets, Net
Net current deferred tax asset
Deferred Tax Assets (Liabilities), Net of Valuation Allowance, Current
Deferred Tax Assets (Liabilities), Net of Valuation Allowance, Current
Net noncurrent deferred tax liability
Noncurrent Deferred Tax Liabilities
Noncurrent deferred tax liabilities
Deferred Tax Liabilities, Net, Noncurrent
Deferred Income Tax Liabilities, Net
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain]
Non-vested share award related compensation expense
Tax benefit
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense
Total non-vested share award related compensation expense included in net income
Allocated Share-based Compensation Expense, Net of Tax
Schedule Of Activity In Our Various Shareholders' Equity
Schedule Of Activity In Our Various Shareholders Equity [Table Text Block]
Schedule Of Activity In Our Various Shareholders Equity [Table Text Block]
Property And Equipment
Property, Plant and Equipment Disclosure [Text Block]
Current income tax expense, U.S.
Current Federal Tax Expense (Benefit)
Current income tax expense, Non-U.S.
Current Foreign Tax Expense (Benefit)
Current Income Tax Expense, Total
Deferred income tax expense (benefit), U.S.
Deferred Federal Income Tax Expense (Benefit)
Deferred income tax expense (benefit), Non-U.S.
Deferred Foreign Income Tax Expense (Benefit)
Deferred income tax expense
Income Tax Expense (Benefit)