Valaris Limited (VAL) 8-K 22 Sep 14 2013 FY Other Events Financial data

Document_And_Entity_Informatio

Document And Entity Information (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Feb. 10, 2014	Jun. 30, 2013
Document And Entity Information [Abstract]	'	'	'
Document Type	'8-K	'	'
Amendment Flag	'false	'	'
Document Period End Date	31-Dec-13	'	'
Entity Registrant Name	'Ensco plc	'	'
Entity Central Index Key	'0000314808	'	'
Current Fiscal Year End Date	'--12-31	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Entity Public Float	'	'	$11,730,723
Entity Common Shares, Shares Outstanding	'	233,568,357	'

Consolidated_Statements_Of_Inc

Consolidated Statements Of Income (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]	'	'	'
OPERATING REVENUES	$4,519.90	$3,869.20	$2,599.20
OPERATING EXPENSES	'	'	'
Contract drilling (exclusive of depreciation)	2,080.10	1,747.90	1,286.10
Depreciation	528.2	476.1	357.6
General and administrative	146.8	148.9	158.6
Total operating expenses	2,755.10	2,372.90	1,802.30
OPERATING INCOME	1,764.80	1,496.30	796.9
OTHER INCOME (EXPENSE)	'	'	'
Interest income	16.6	22.8	17.2
Interest expense, net	-158.8	-123.6	-95.9
Other, net	42.1	2.2	20.8
Other income (expense), net	-100.1	-98.6	-57.9
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	1,664.70	1,397.70	739
PROVISION FOR INCOME TAXES	'	'	'
Current income tax expense	201.5	211	124.7
Deferred income tax expense (benefit)	11.2	27.1	-13.1
Total provision for income taxes	212.7	238.1	111.6
INCOME FROM CONTINUING OPERATIONS	1,452	1,159.60	627.4
DISCONTINUED OPERATIONS, NET	-24.1	17.1	-21.8
NET INCOME	1,427.90	1,176.70	605.6
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	-9.7	-7	-5.2
NET INCOME ATTRIBUTABLE TO ENSCO	1,418.20	1,169.70	600.4
EARNINGS PER SHARE - BASIC	'	'	'
Continuing operations	$6.19	$4.97	$3.20
Discontinued operations	($0.11)	$0.08	($0.11)
Total earnings per share - basic	$6.08	$5.05	$3.09
EARNINGS PER SHARE - DILUTED	'	'	'
Continuing operations	$6.18	$4.97	$3.19
Discontinued operations	($0.11)	$0.07	($0.11)
Total earnings per share - diluted	$6.07	$5.04	$3.08
NET INCOME ATTRIBUTABLE TO ENSCO SHARES - BASIC AND DILUTED	$1,403.10	$1,157.40	$593.50
WEIGHTED-AVERAGE SHARES OUTSTANDING	'	'	'
Basic	230.9	229.4	192.2
Diluted	231.1	229.7	192.6
CASH DIVIDENDS PER SHARE	$2.25	$1.50	$1.40

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]	'	'	'	'	'	'	'	'	'	'	'
NET INCOME	$364	$381.40	$362.60	$319.90	$221.20	$345.40	$342.70	$267.40	$1,427.90	$1,176.70	$605.60
OTHER COMPREHENSIVE INCOME (LOSS), NET	'	'	'	'	'	'	'	'	'	'	'
Net change in fair value of derivatives	'	'	'	'	'	'	'	'	-5.8	8.7	0.1
Reclassification of gains and losses on derivative instruments from other comprehensive (income) loss into net income	'	'	'	'	'	'	'	'	2	0	-5.5
Other	'	'	'	'	'	'	'	'	1.9	2.8	2.9
NET OTHER COMPREHENSIVE INCOME (LOSS)	'	'	'	'	'	'	'	'	-1.9	11.5	-2.5
COMPREHENSIVE INCOME	'	'	'	'	'	'	'	'	1,426	1,188.20	603.1
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	'	'	'	'	'	'	'	'	-9.7	-7	-5.2
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	'	'	'	'	'	'	'	'	$1,416.30	$1,181.20	$597.90

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
CURRENT ASSETS	'	'
Cash and cash equivalents	$165,600,000	$487,100,000
Accounts receivable, net	855,700,000	811,400,000
Other	513,900,000	425,400,000
Total current assets	1,535,200,000	1,723,900,000
PROPERTY AND EQUIPMENT, AT COST	17,498,500,000	15,737,100,000
Less accumulated depreciation	3,187,500,000	2,591,500,000
Property and equipment, net	14,311,000,000	13,145,600,000
GOODWILL	3,274,000,000	3,274,000,000
OTHER ASSETS, NET	352,700,000	421,800,000
TOTAL ASSETS	19,472,900,000	18,565,300,000
CURRENT LIABILITIES	'	'
Accounts payable - trade	341,100,000	357,800,000
Accrued liabilities and other	658,700,000	584,400,000
Short-term debt	'	0
Current maturities of long-term debt	47,500,000	47,500,000
Total current liabilities	1,047,300,000	989,700,000
LONG-TERM DEBT	4,718,900,000	4,798,400,000
DEFERRED INCOME TAXES	362,100,000	351,700,000
OTHER LIABILITIES	545,700,000	573,400,000
COMMITMENTS AND CONTINGENCIES	'	'
ENSCO SHAREHOLDERS' EQUITY	'	'
Additional paid-in capital	5,467,200,000	5,398,700,000
Retained earnings	7,327,300,000	6,434,700,000
Accumulated other comprehensive income	18,200,000	20,100,000
Treasury shares, at cost, 6.0 million shares and 5.3 million shares	-45,200,000	-31,000,000
Total Ensco shareholders' equity	12,791,600,000	11,846,400,000
NONCONTROLLING INTERESTS	7,300,000	5,700,000
Total equity	12,798,900,000	11,852,100,000
Total liabilities and shareholders' equity	19,472,900,000	18,565,300,000
Class A Ordinary Shares, U.S. [Member]	'	'
ENSCO SHAREHOLDERS' EQUITY	'	'
Common shares, value	24,000,000	23,800,000
Common Class B, Par Value In GBP [Member]	'	'
ENSCO SHAREHOLDERS' EQUITY	'	'
Common shares, value	$100,000	$100,000

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
			Class A Ordinary Shares, U.S. [Member]	Class A Ordinary Shares, U.S. [Member]	Common Class B, Par Value In GBP [Member]	Common Class B, Par Value In GBP [Member]
			USD ($)	USD ($)	GBP (£)	GBP (£)
Common shares, par value	'	'	$0.10	$0.10	£ 1	£ 1
Common shares, shares authorized	'	'	450,000,000	450,000,000	50,000	50,000
Common shares, shares issued	'	'	239,500,000	237,700,000	50,000	50,000
Treasury shares, shares held	6,000,000	5,300,000	'	'	'	'

Consolidated_Statements_Of_Cas

Consolidated Statements Of Cash Flows (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
OPERATING ACTIVITIES	'	'	'
Net income	$1,427.90	$1,176.70	$605.60
Adjustments to reconcile net income to net cash provided by operating activities of continuing operations:	'	'	'
Discontinued operations, net	24.1	-17.1	21.8
Depreciation expense	528.2	476.1	357.6
Settlement of warranty or other claims	-11	-57.9	0
Share-based compensation expense	50.3	53.2	47.7
Amortization of intangibles and other, net	-20.7	-16.4	-18.2
Deferred income tax expense (benefit)	11.2	27.1	-13.1
Other	15	6	-0.9
Changes in operating assets and liabilities	-138.3	426.4	-243.1
Net cash provided by operating activities of continuing operations	1,886.70	2,074.10	757.4
INVESTING ACTIVITIES	'	'	'
Additions to property and equipment	-1,768.50	-1,715	-645.7
Acquisition of Pride International, Inc., net of cash acquired	0	0	-2,656
Purchases of short-term investments	-50	-90	-4.5
Maturities of short-term investments	50	44.5	0
Other	6	3.2	5.3
Net cash used in investing activities of continuing operations	-1,762.50	-1,757.30	-3,300.90
FINANCING ACTIVITIES	'	'	'
Cash dividends paid	-525.6	-348.1	-292.3
Reduction of long-term borrowings	-47.5	-47.5	-213.3
Proceeds from exercise of share options	22.3	35.8	39.9
Debt financing costs	-4.6	0	-31.8
Commercial paper borrowings, net	0	-125	125
Equity financing costs	0	66.7	-70.5
Proceeds from issuance of senior notes	0	0	2,462.80
Other	-21.7	-17.4	-15.7
Net cash (used in) provided by financing activities of continuing operations	-577.1	-435.5	2,004.10
DISCONTINUED OPERATIONS	'	'	'
Operating activities	93.8	113	-25.2
Investing activities	37.8	60.1	-54.6
Net cash provided by discontinued operations	131.6	173.1	-79.8
Effect of exchange rate changes on cash and cash equivalents	-0.2	2	-0.8
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	-321.5	56.4	-620
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	487.1	430.7	1,050.70
CASH AND CASH EQUIVALENTS, END OF YEAR	$165.60	$487.10	$430.70

Description_Of_The_Business_An

Description Of The Business And Summary Of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
Description Of The Business And Summary Of Significant Accounting Policies [Abstract]	'
Description Of The Business And Summary Of Significant Accounting Policies	'
	DESCRIPTION OF THE BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Business
	We are one of the leading providers of offshore contract drilling services to the international oil and gas industry. We own an offshore drilling rig fleet of 74 rigs, including six rigs under construction, spanning most of the strategic, high-growth markets around the globe. Our rig fleet includes ten drillships, 13 dynamically positioned semisubmersible rigs, six moored semisubmersible rigs and 45 jackup rigs.  Our fleet is the world's second largest amongst competitive rigs, our ultra-deepwater fleet is the newest in the industry, and our premium jackup fleet is the largest of any offshore drilling company.
	Our customers include most of the leading national and international oil companies, in addition to many independent operators. We are among the most geographically diverse offshore drilling companies, with current operations and drilling contracts spanning approximately 20 countries on six continents in nearly every major offshore basin around the world. The markets in which we operate include the U.S. Gulf of Mexico, Mexico, Brazil, the Mediterranean, the North Sea, the Middle East, West Africa, Australia and Southeast Asia.
	We provide drilling services on a "day rate" contract basis. Under day rate contracts, we provide a drilling rig and rig crews and receive a fixed amount per day for drilling a well. Our customers bear substantially all of the ancillary costs of constructing the well and supporting drilling operations, as well as the economic risk relative to the success of the well. In addition, our customers may pay all or a portion of the cost of moving our equipment and personnel to and from the well site. We do not provide "turnkey" or other risk-based drilling services.
	Redomestication
	During 2009, we completed a reorganization of the corporate structure of the group of companies controlled by our predecessor, ENSCO International Incorporated ("Ensco Delaware"), pursuant to which an indirect, wholly-owned subsidiary merged with Ensco Delaware, and Ensco plc became our publicly-held parent company incorporated under English law (the "redomestication").
	The redomestication was accounted for as an internal reorganization of entities under common control and, therefore, Ensco Delaware's assets and liabilities were accounted for at their historical cost basis and not revalued in the transaction. We remain subject to the U.S. Securities and Exchange Commission (the "SEC") reporting requirements, the mandates of the Sarbanes-Oxley Act of 2002, as amended, and the applicable corporate governance rules of the New York Stock Exchange ("NYSE"), and we will continue to report our consolidated financial results in U.S. dollars and in accordance with U.S. generally accepted accounting principles ("GAAP"). We also must comply with additional reporting requirements of English law.
	Basis of Presentation—U.K. Companies Act 2006 Section 435 Statement
	The accompanying consolidated financial statements have been prepared in accordance with GAAP, which the directors consider to be the most meaningful presentation of our results of operations and financial position.  The accompanying consolidated financial statements do not constitute statutory accounts required by the U.K. Companies Act 2006, which for the year ended December 31, 2013 will be prepared in accordance with generally accepted accounting principles in the U.K. and delivered to the Registrar of Companies in the U.K. following the annual general meeting of shareholders.  The U.K. statutory accounts are expected to include an unqualified auditor’s report, which is not expected to contain any references to matters on which the auditors drew attention by way of emphasis without qualifying the report or any statements under Sections 498(2) or 498(3) of the U.K. Companies Act 2006.
	Principles of Consolidation
	The accompanying consolidated financial statements include the accounts of Ensco plc and its majority-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated. Certain previously reported amounts have been reclassified to conform to the current year presentation.
	Pervasiveness of Estimates
	The preparation of financial statements in conformity with GAAP requires management to make certain estimates, judgments and assumptions that affect the reported amounts of assets and liabilities, the related revenues and expenses and disclosures of gain and loss contingencies as of the date of the financial statements. Actual results could differ from those estimates.
	Foreign Currency Remeasurement and Translation
	Our functional currency is the U.S. dollar. As is customary in the oil and gas industry, a majority of our revenues and expenses are denominated in U.S. dollars; however, a portion of the revenues earned and expenses incurred by certain of our subsidiaries are denominated in currencies other than the U.S. dollar ("foreign currencies"). These transactions are remeasured in U.S. dollars based on a combination of both current and historical exchange rates. Most transaction gains and losses, including certain gains and losses on our derivative instruments, are included in other, net, in our consolidated statement of income.  Certain gains and losses from the translation of foreign currency balances of our non-U.S. dollar functional currency subsidiaries are included in accumulated other comprehensive income on our consolidated balance sheet.  We incurred net foreign currency exchange gains of $6.4 million, net foreign currency exchange losses of $3.5 million and net foreign currency exchange gains of $16.9 million for the years ended December 31, 2013, 2012 and 2011, respectively.
	Cash Equivalents and Short-Term Investments
	Highly liquid investments with maturities of three months or less at the date of purchase are considered cash equivalents. Highly liquid investments with maturities of greater than three months but less than one year at the date of purchase are classified as short-term investments.
	Short-term investments, consisting of time deposits with initial maturities in excess of three months but less than one year, were included in other current assets on our consolidated balance sheets and totaled $50.0 million as of December 31, 2013 and 2012. Cash flows from purchases and maturities of short-term investments were classified as investing activities in our consolidated statements of cash flows for the years ended December 31, 2013, 2012 and 2011.
	Property and Equipment
	All costs incurred in connection with the acquisition, construction, major enhancement and improvement of assets are capitalized, including allocations of interest incurred during periods that our drilling rigs are under construction or undergoing major enhancements and improvements. Repair and maintenance costs are charged to contract drilling expense in the period in which they occur. Upon sale or retirement of assets, the related cost and accumulated depreciation are removed from the balance sheet, and the resulting gain or loss is included in contract drilling expense, unless reclassified to discontinued operations.
	Our property and equipment is depreciated on a straight-line basis, after allowing for salvage values, over the estimated useful lives of our assets. Drilling rigs and related equipment are depreciated over estimated useful lives ranging from four to 35 years.  Buildings and improvements are depreciated over estimated useful lives ranging from two to 30 years. Other equipment, including computer and communications hardware and software costs, is depreciated over estimated useful lives ranging from two to six years.
	We evaluate the carrying value of our property and equipment for impairment when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable. For property and equipment used in our operations, recoverability generally is determined by comparing the carrying value of an asset to the expected undiscounted future cash flows of the asset. If the carrying value of an asset is not recoverable, the amount of impairment loss is measured as the difference between the carrying value of the asset and its estimated fair value. Property and equipment held for sale is recorded at the lower of net book value or net realizable value.
	If the global economy were to deteriorate and/or the offshore drilling industry were to incur a significant prolonged downturn, it is reasonably possible that impairment charges may occur with respect to specific individual rigs, groups of rigs, such as a specific type of drilling rig, or rigs in a certain geographic location.
	Goodwill
	Our business consists of three operating segments: (1) Floaters, which includes our drillships and semisubmersible rigs, (2) Jackups and (3) Other, which consists of management services on rigs owned by third-parties. Our two reportable segments, Floaters and Jackups, provide one service, contract drilling.
	We test goodwill for impairment on an annual basis as of December 31 of each year or when events or changes in circumstances indicate that a potential impairment exists.  When testing goodwill for impairment, we perform a qualitative assessment to determine whether it is more-likely-than-not that the fair value of a reporting unit is less than its carrying amount.
	If we conclude that the fair value of one or both of our reporting units has more-likely-than-not declined below its carrying amount after qualitatively assessing existing facts and circumstances, we perform a quantitative assessment whereby we estimate the fair value of each reporting unit.  In most instances, our calculation of the fair value of our reporting units is based on estimates of future discounted cash flows to be generated by our drilling rigs in the reporting unit.
	Based on a qualitative assessment performed as of December 31, 2013, we concluded it was more-likely-than-not that the fair value of our reporting units exceeded their carrying amount, and there was no impairment of goodwill. However, if the market value of our shares declines for a prolonged period, and if management's judgments and assumptions regarding future industry conditions and operations diminish, it is reasonably possible that our expectations of future cash flows may decline and ultimately result in goodwill impairment for our Floaters reporting unit. See "Note 9 - Goodwill and Other Intangible Assets and Liabilities" for additional information on our goodwill.
	Operating Revenues and Expenses
	Substantially all of our drilling contracts ("contracts") are performed on a day rate basis, and the terms of such contracts are typically for a specific period of time or the period of time required to complete a specific task, such as drill a well. Contract revenues and expenses are recognized on a per day basis, as the work is performed. Day rate revenues are typically earned, and contract drilling expense is typically incurred, on a uniform basis over the terms of our contracts.
	In connection with some contracts, we receive lump-sum fees or similar compensation for the mobilization of equipment and personnel prior to the commencement of drilling services or the demobilization of equipment and personnel upon contract completion. Fees received for the mobilization or demobilization of equipment and personnel are included in operating revenues. The costs incurred in connection with the mobilization and demobilization of equipment and personnel are included in contract drilling expense.
	Mobilization fees received and costs incurred prior to commencement of drilling operations are deferred and recognized on a straight-line basis over the period that the related drilling services are performed. Demobilization fees and related costs are recognized as incurred upon contract completion. Costs associated with the mobilization of equipment and personnel to more promising market areas without contracts are expensed as incurred.
	Deferred mobilization costs were included in other current assets and other assets, net, on our consolidated balance sheets and totaled $66.6 million and $54.5 million as of December 31, 2013 and 2012, respectively. Deferred mobilization revenue was included in accrued liabilities and other, and other liabilities on our consolidated balance sheets and totaled $76.8 million and $52.6 million as of December 31, 2013 and 2012, respectively.
	In connection with some contracts, we receive up-front lump-sum fees or similar compensation for capital improvements to our drilling rigs. Such compensation is deferred and recognized as revenue over the period that the related drilling services are performed. The cost of such capital improvements is capitalized and depreciated over the useful life of the asset. Deferred revenue associated with capital improvements was included in accrued liabilities and other, and other liabilities on our consolidated balance sheets and totaled $273.6 million and $301.9 million as of December 31, 2013 and 2012, respectively.
	We must obtain certifications from various regulatory bodies in order to operate our drilling rigs and must maintain such certifications through periodic inspections and surveys. The costs incurred in connection with maintaining such certifications, including inspections, tests, surveys and drydock, as well as remedial structural work and other compliance costs, are deferred and amortized over the corresponding certification periods. Deferred regulatory certification and compliance costs were included in other current assets and other assets, net, on our consolidated balance sheets and totaled $18.3 million and $14.4 million as of December 31, 2013 and 2012, respectively.
	In certain countries in which we operate, taxes such as sales, use, value-added, gross receipts and excise may be assessed by the local government on our revenues. We generally record our tax-assessed revenue transactions on a net basis in our consolidated statement of income.
	Derivative Instruments
	We use derivatives to reduce our exposure to various market risks, primarily foreign currency exchange rate risk. See "Note 6 - Derivative Instruments" for additional information on how and why we use derivatives.
	All derivatives are recorded on our consolidated balance sheet at fair value. Derivatives subject to legally enforceable master netting agreements are not offset on our consolidated balance sheet. Accounting for the gains and losses resulting from changes in the fair value of derivatives depends on the use of the derivative and whether it qualifies for hedge accounting. Derivatives qualify for hedge accounting when they are formally designated as hedges and are effective in reducing the risk exposure that they are designated to hedge. Our assessment of hedge effectiveness is formally documented at hedge inception, and we review hedge effectiveness and measure any ineffectiveness throughout the designated hedge period on at least a quarterly basis.
	Changes in the fair value of derivatives that are designated as hedges of the variability in expected future cash flows associated with existing recognized assets or liabilities or forecasted transactions ("cash flow hedges") are recorded in accumulated other comprehensive income ("AOCI").  Amounts recorded in AOCI associated with cash flow hedges are subsequently reclassified into contract drilling, depreciation or interest expense as earnings are affected by the underlying hedged forecasted transactions.
	Gains and losses on a cash flow hedge, or a portion of a cash flow hedge, that no longer qualifies as effective due to an unanticipated change in the forecasted transaction are recognized currently in earnings and included in other, net, in our consolidated statement of income based on the change in the fair value of the derivative. When a forecasted transaction is no longer probable of occurring, gains and losses on the derivative previously recorded in AOCI are reclassified currently into earnings and included in other, net, in our consolidated statement of income.
	We occasionally enter into derivatives that hedge the fair value of recognized assets or liabilities, but do not designate such derivatives as hedges or the derivatives otherwise do not qualify for hedge accounting. In these situations, there generally is a natural hedging relationship where changes in the fair value of the derivatives offset changes in the fair value of the underlying hedged items. Changes in the fair value of these derivatives are recognized currently in earnings in other, net, in our consolidated statement of income.
	Derivatives with asset fair values are reported in other current assets or other assets, net, on our consolidated balance sheet depending on maturity date. Derivatives with liability fair values are reported in accrued liabilities and other or other liabilities on our consolidated balance sheet depending on maturity date.
	Income Taxes
	We conduct operations and earn income in numerous countries. Current income taxes are recognized for the amount of taxes payable or refundable based on the laws and income tax rates in the taxing jurisdictions in which operations are conducted and income is earned.
	Deferred tax assets and liabilities are recognized for the anticipated future tax effects of temporary differences between the financial statement basis and the tax basis of our assets and liabilities using the enacted tax rates in effect at year-end. A valuation allowance for deferred tax assets is recorded when it is more-likely-than-not that the benefit from the deferred tax asset will not be realized. We do not offset deferred tax assets and deferred tax liabilities attributable to different tax paying jurisdictions.
	We operate in certain jurisdictions where tax laws relating to the offshore drilling industry are not well developed and change frequently. Furthermore, we may enter into transactions with affiliates or employ other tax planning strategies that generally are subject to complex tax regulations. As a result of the foregoing, the tax liabilities and assets we recognize in our financial statements may differ from the tax positions taken, or expected to be taken, in our tax returns. Our tax positions are evaluated for recognition using a more-likely-than-not threshold, and those tax positions requiring recognition are measured as the largest amount of tax benefit that is greater than 50% likely of being realized upon effective settlement with a taxing authority that has full knowledge of all relevant information. Interest and penalties relating to income taxes are included in current income tax expense in our consolidated statement of income.
	Our drilling rigs frequently move from one taxing jurisdiction to another based on where they are contracted to perform drilling services. The movement of drilling rigs among taxing jurisdictions may involve a transfer of drilling rig ownership among our subsidiaries (“intercompany rig sale”). The pre-tax profit resulting from an intercompany rig sale is eliminated from our consolidated financial statements and the carrying value of a rig sold in an intercompany transaction remains at historical net depreciated cost prior to the transaction. Our consolidated financial statements do not reflect the asset disposition transaction of the selling subsidiary or the asset acquisition transaction of the acquiring subsidiary. Income taxes resulting from an intercompany rig sale, as well as the tax effect of any reversing temporary differences resulting from the sale, are deferred and amortized on a straight-line basis over the remaining useful life of the rig.
	In some instances, we may determine that certain temporary differences will not result in a taxable or deductible amount in future years; as it is more-likely-than-not we will commence operations and depart from a given taxing jurisdiction without such temporary differences being recovered or settled. Under these circumstances, no future tax consequences are expected and no deferred taxes are recognized in connection with such operations. We evaluate these determinations on a periodic basis and, in the event our expectations relative to future tax consequences change, the applicable deferred taxes are recognized or derecognized.
	We do not provide deferred taxes on the undistributed earnings of certain subsidiaries because our policy and intention is to reinvest such earnings indefinitely. See "Note 10 - Income Taxes" for additional information on our deferred taxes, unrecognized tax benefits, intercompany transfers of drilling rigs and undistributed earnings.
	Share-Based Compensation
	We sponsor share-based compensation plans that provide equity compensation to our key employees, officers and non-employee directors. Share-based compensation cost is measured at fair value on the date of grant and recognized on a straight-line basis over the requisite service period (usually the vesting period). The amount of compensation cost recognized in our consolidated statement of income is based on the awards ultimately expected to vest and, therefore, reduced for estimated forfeitures. All changes in estimated forfeitures are based on historical experience and are recognized as a cumulative adjustment to compensation cost in the period in which they occur. See "Note 8 - Benefit Plans" for additional information on our share-based compensation.
	Fair Value Measurements
	We measure certain of our assets and liabilities based on a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy assigns the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities ("Level 1") and the lowest priority to unobservable inputs ("Level 3").  Level 2 measurements represent inputs that are observable for similar assets or liabilities, either directly or indirectly, other than quoted prices included within Level 1.  See "Note 3 - Fair Value Measurements" for additional information on the fair value measurement of certain of our assets and liabilities.
	Earnings Per Share
	We compute basic and diluted earnings per share ("EPS") in accordance with the two-class method. Net income attributable to Ensco used in our computations of basic and diluted EPS is adjusted to exclude net income allocated to non-vested shares granted to our employees and non-employee directors. Weighted-average shares outstanding used in our computation of diluted EPS is calculated using the treasury stock method and excludes non-vested shares.
	The following table is a reconciliation of net income attributable to Ensco shares used in our basic and diluted EPS computations for each of the years in the three-year period ended December 31, 2013 (in millions):
		2013				2012			2011
	Net income attributable to Ensco		$1,418.20				$1,169.70			$600.40
	Net income allocated to non-vested share awards	(15.1		)		(12.3		)	(6.9		)
	Net income attributable to Ensco shares		$1,403.10				$1,157.40			$593.50
	The following table is a reconciliation of the weighted-average shares used in our basic and diluted earnings per share computations for each of the years in the three-year period ended December 31, 2013 (in millions):
	2013			2012			2011
Weighted-average shares - basic	230.9			229.4			192.2
Potentially dilutive shares	0.2			0.3			0.4
Weighted-average shares - diluted	231.1			229.7			192.6
Antidilutive share options totaling 300,000 for the year ended December 31, 2013 and 400,000 for the years ended December 31, 2012 and 2011 were excluded from the computation of diluted EPS.
Noncontrolling Interests
Third parties hold a noncontrolling ownership interest in certain of our non-U.S. subsidiaries. Noncontrolling interests are classified as equity on our consolidated balance sheet and net income attributable to noncontrolling interests is presented separately in our consolidated statement of income.
Income from continuing operations attributable to Ensco for each of the years in the three-year period ended December 31, 2013 was as follows (in millions):
	2013				2012			2011
Income from continuing operations	$	1,452.00			$	1,159.60		$	627.4
Income from continuing operations attributable to noncontrolling interests	(8.9		)		(7.0		)	(5.2		)
Income from continuing operations attributable to Ensco	$	1,443.10			$	1,152.60		$	622.2
(Loss) income from discontinued operations attributable to Ensco for each of the years in the three-year period ended December 31, 2013 was as follows (in millions):
	2013				2012			2011
(Loss) income from discontinued operations	$	(24.1	)		$	17.1		$	(21.8	)
Income from discontinued operations attributable to noncontrolling interests	(.8		)		—			—
(Loss) income from discontinued operations attributable to Ensco	$	(24.9	)		$	17.1		$	(21.8	)

Acquisition_Of_Pride_Internati

Acquisition Of Pride International, Inc.	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
Acquisition Of Pride International, Inc.	'
	ACQUISITION OF PRIDE INTERNATIONAL, INC.
	On May 31, 2011 (the "Merger Date"), Ensco plc completed a merger transaction (the "Merger") with Pride International, Inc., a Delaware corporation ("Pride"), pursuant to which Pride became an indirect, wholly-owned subsidiary of Ensco plc.
	The Merger  added drillships to our asset base, increased our presence in Angola and Brazil as well as various other major offshore drilling markets and established our fleet as the world's second largest competitive offshore drilling rig fleet.
	Pro Forma Impact of the Merger
	The following unaudited supplemental pro forma results for the year ended December 31, 2011 includes pro forma results for the period prior to the closing date of May 31, 2011 and actual results for the period from May 31, 2011 through December 31, 2011. The pro forma results include, among others, (i) the amortization associated with the acquired intangible assets and liabilities; (ii) interest expense associated with debt used to fund a portion of the Merger; and (iii) the impact of certain fair value adjustments such as additional depreciation expense for adjustments to property and equipment and reductions to interest expense for adjustments to debt.  The pro forma results do not include any potential synergies, non-recurring charges resulting directly from the Merger, cost savings or other expected benefits of the Merger. The pro forma results should not be considered indicative of future results.
	(In millions, except per share amounts)
		2011*
	Revenues	$	3,094.60
	Net income	604.8
	Earnings per share - basic	2.61
	Earnings per share - diluted	2.6
	*	Supplemental pro forma earnings were adjusted to exclude an aggregate $157.6 million of merger-related costs incurred by Ensco and Pride during 2011.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	FAIR VALUE MEASUREMENTS
	The following fair value hierarchy table categorizes information regarding our net financial assets measured at fair value on a recurring basis as of December 31, 2013 and 2012 (in millions):
		Quoted Prices in			Significant			Significant			Total
		Active Markets			Other			Unobservable
		for			Observable			Inputs
		Identical Assets			Inputs			(Level 3)
		(Level 1)			(Level 2)
	As of December 31, 2013
	Supplemental executive retirement plan assets	$	37.7		$	—		$	—		$	37.7
	Derivatives, net	—			1.8			—			1.8
	Total financial assets	$	37.7		$	1.8		$	—		$	39.5
	As of December 31, 2012
	Supplemental executive retirement plan assets	$	29.8		$	—		$	—		$	29.8
	Derivatives, net	—			5.2			—			5.2
	Total financial assets	$	29.8		$	5.2		$	—		$	35
	Supplemental Executive Retirement Plans
	Our Ensco supplemental executive retirement plans (the "SERP") are non-qualified plans that provide for eligible employees to defer a portion of their compensation for use after retirement. Assets held in the SERP were marketable securities measured at fair value on a recurring basis using Level 1 inputs and were included in other assets, net, on our consolidated balance sheets as of December 31, 2013 and 2012.  The fair value measurements of assets held in the SERP were based on quoted market prices. Net unrealized gains of $6.2 million and $2.8 million and net unrealized losses of $300,000 from marketable securities held in our SERP were included in other, net, in our consolidated statements of income for the years ended December 31, 2013, 2012 and 2011, respectively.
	Derivatives
	Our derivatives were measured at fair value on a recurring basis using Level 2 inputs as of December 31, 2013 and 2012.  See "Note 6 - Derivative Instruments" for additional information on our derivatives, including a description of our foreign currency hedging activities and related methodologies used to manage foreign currency exchange rate risk. The fair value measurements of our derivatives were based on market prices that are generally observable for similar assets or liabilities at commonly quoted intervals.
	Other Financial Instruments
	The carrying values and estimated fair values of our debt instruments as of December 31, 2013 and 2012 were as follows (in millions):
			31-Dec-13						31-Dec-12
			Carrying			Estimated			Carrying			Estimated
			Value			Fair			Value			Fair
						Value						Value
	4.70% Senior notes due 2021		$	1,477.20		$	1,596.90		$	1,474.70		$	1,715.60
	6.875% Senior notes due 2020		1,024.80			1,086.70			1,040.60			1,138.30
	3.25% Senior notes due 2016		996.5			1,045.80			995.1			1,068.90
	8.50% Senior notes due 2019		600.5			635.8			616.4			661.7
	7.875% Senior notes due 2040		382.6			410.5			383.8			423.9
	7.20% Debentures due 2027		149.1			178.6			149			193.2
	4.33% MARAD bonds, including current maturities, due 2016		78.9			79.7			112.3			121.6
	6.36% MARAD bonds, including current maturities, due 2015		25.3			27.1			38			48.7
	4.65% MARAD bonds, including current maturities, due 2020		31.5			35.2			36			43.9
	Total		$	4,766.40		$	5,096.30		$	4,845.90		$	5,415.80
	The estimated fair values of our senior notes and debentures were determined using quoted market prices. The estimated fair values of our U.S. Maritime Administration ("MARAD") bonds were determined using an income approach valuation model. The estimated fair values of our cash and cash equivalents, short-term investments, receivables, trade payables and other liabilities approximated their carrying values as of December 31, 2013 and 2012.

Property_And_Equipment

Property And Equipment	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Property And Equipment	'
	PROPERTY AND EQUIPMENT
	Property and equipment as of December 31, 2013 and 2012 consisted of the following (in millions):
		2013		2012
	Drilling rigs and equipment	$	15,839.00	$	13,499.40
	Other	101		89.1
	Work in progress	1,558.50		2,148.60
		$	17,498.50	$	15,737.10
	Drilling rigs and equipment increased $2.3 billion primarily due to ENSCO 8506, ENSCO DS-6 and ENSCO DS-7, which were placed into service during 2013, and capital upgrades to the rig fleet.
	Work in progress decreased $590.1 million during 2013 primarily due to the aforementioned rigs that were placed into service, partially offset by the construction of four ultra-premium harsh environment jackup rigs, three ultra-deepwater drillships and one premium jackup rig. Work in progress as of December 31, 2013 primarily consisted of $627.2 million related to the construction of the ENSCO 120 Series ultra-premium harsh environment jackup rigs, $513.4 million related to the construction of ENSCO DS-8, ENSCO DS-9 and ENSCO DS-10 ultra-deepwater drillships, $43.7 million related to the construction of ENSCO 110 premium jackup rig and costs associated with various modification and enhancement projects.
	Work in progress as of December 31, 2012 primarily consisted of $1.1 billion related to the construction of ENSCO DS-6, ENSCO DS-7, ENSCO DS-8 and ENSCO DS-9 ultra-deepwater drillships, $603.9 million related to the construction of ENSCO 8506 ultra-deepwater semisubmersible rig, $157.4 million related to the construction of the ENSCO 120 Series ultra-premium harsh environment jackup rigs and costs associated with various modification and enhancement projects.

Debt

Debt	12 Months Ended
	Dec. 31, 2013
Debt Instruments [Abstract]	'
Debt	'
	DEBT
	The carrying value of long-term debt as of December 31, 2013 and 2012 consisted of the following (in millions):
		2013			2012
	4.70% Senior notes due 2021	$	1,477.20		$	1,474.70
	6.875% Senior notes due 2020	1,024.80			1,040.60
	3.25% Senior notes due 2016	996.5			995.1
	8.50% Senior notes due 2019	600.5			616.4
	7.875% Senior notes due 2040	382.6			383.8
	7.20% Debentures due 2027	149.1			149
	4.33% MARAD bonds due 2016	78.9			112.3
	6.36% MARAD bonds due 2015	25.3			38
	4.65% MARAD bonds due 2020	31.5			36
	Total debt	4,766.40			4,845.90
	Less current maturities	(47.5		)	(47.5		)
	Total long-term debt	$	4,718.90		$	4,798.40
	Senior Notes
	During 2011, we issued $1.0 billion aggregate principal amount of unsecured 3.25% senior notes due 2016 at a discount of $7.6 million and $1.5 billion aggregate principal amount of unsecured 4.70% senior notes due 2021 at a discount of $29.6 million (collectively the "Notes") in a public offering. Interest on the Notes is payable semiannually in March and September of each year.  The Notes were issued pursuant to an indenture between us and Deutsche Bank Trust Company Americas, as trustee (the "Trustee"), dated March 17, 2011, and a supplemental indenture between us and the Trustee, dated March 17, 2011. The proceeds from the sale of the Notes were used to fund a portion of the cash consideration payable in connection with the Merger.
	Upon consummation of the Merger, we assumed the acquired company's outstanding debt comprised of $900.0 million aggregate principal amount of 6.875% senior notes due 2020, $500.0 million aggregate principal amount of 8.5% senior notes due 2019 and $300.0 million aggregate principal amount of 7.875% senior notes due 2040 (the "Acquired Notes"). Under a supplemental indenture, Ensco plc has fully and unconditionally guaranteed the performance of all obligations of Pride with respect to the Acquired Notes.  See "Note 15 - Guarantee of Registered Securities" for additional information on the guarantee of the Acquired Notes.
	We may redeem each series of the Notes and Acquired Notes, in whole or in part, at any time, at a price equal to 100% of their principal amount, plus accrued and unpaid interest and a "make-whole" premium. The indentures governing both the Notes and Acquired Notes contain customary events of default, including failure to pay principal or interest on the Notes and Acquired Notes when due, among others. The indentures governing both the Notes and Acquired Notes also contain certain restrictions, including, among others, restrictions on our ability and the ability of our subsidiaries to create or incur secured indebtedness, enter into certain sale/leaseback transactions and enter into certain merger or consolidation transactions.
	Debentures Due 2027
	During 1997, Ensco Delaware issued $150.0 million of unsecured 7.20% Debentures due November 15, 2027 (the "Debentures") in a public offering. Interest on the Debentures is payable semiannually in May and November. We may redeem the Debentures, in whole or in part, at any time prior to maturity, at a price equal to 100% of their principal amount, plus accrued and unpaid interest and a "make-whole" premium. The indenture under which the Debentures were issued contains limitations on the incurrence of indebtedness secured by certain liens and limitations on engaging in certain sale/leaseback transactions and certain merger, consolidation or reorganization transactions. The Debentures are not subject to any sinking fund requirements. During 2009, in connection with the redomestication, Ensco plc entered into a supplemental indenture to unconditionally guarantee the principal and interest payments on the Debentures.
	The Debentures, the indenture and the supplemental indenture also contain customary events of default, including failure to pay principal or interest on the Debentures when due, among others. The supplemental indenture contains certain restrictions, including, among others, restrictions on our ability and the ability of our subsidiaries to create or incur secured indebtedness, enter into certain sale/leaseback transactions and enter into certain merger or consolidation transactions.
	MARAD Bonds Due 2015, 2016 and 2020
	During 2001, a subsidiary of Ensco Delaware issued $190.0 million of 15-year bonds which are guaranteed by MARAD to provide long-term financing for ENSCO 7500. The bonds will be repaid in 30 equal semiannual principal installments of $6.3 million ending in December 2015. Interest on the bonds is payable semiannually, in June and December, at a fixed rate of 6.36%.
	During 2003, a subsidiary of Ensco Delaware issued $76.5 million of 17-year bonds which are guaranteed by MARAD to provide long-term financing for ENSCO 105. The bonds will be repaid in 34 equal semiannual principal installments of $2.3 million ending in October 2020. Interest on the bonds is payable semiannually, in April and October, at a fixed rate of 4.65%.
	Ensco Delaware issued separate guaranties to MARAD, guaranteeing the performance of obligations under the bonds.  In February 2010, the documents governing MARAD's guarantee commitments were amended to address certain changes arising from the redomestication and to include Ensco plc as an additional guarantor of the debt obligations of Ensco Delaware and its subsidiaries.
	Upon consummation of the Merger, we assumed $151.5 million of MARAD bonds issued to provide long-term financing for ENSCO 6003 and ENSCO 6004. The bonds are guaranteed by MARAD and will be repaid in semiannual principal installments ending in 2016. Interest on the bonds is payable semiannually at a weighted average fixed rate of 4.33%.
	Commercial Paper
	We participate in a commercial paper program with four commercial paper dealers pursuant to which we may issue, on a private placement basis, unsecured commercial paper notes up to a maximum aggregate amount outstanding at any time of $1.0 billion.  Amounts issued under the commercial paper program are supported by the available and unused committed capacity under our Five-Year Credit Facility. As a result, amounts issued under the commercial paper program will be limited by the amount of our available and unused committed capacity under our Five-Year Credit Facility. The proceeds of such financings may be used for capital expenditures and other general corporate purposes.  The commercial paper will bear interest at rates that will vary based on market conditions and the ratings assigned by credit rating agencies at the time of issuance.  The weighted-average interest rate on our commercial paper borrowings was 0.35% and 0.44% during 2013 and 2012, respectively.  The maturities of the commercial paper will vary, but may not exceed 364 days from the date of issue. The commercial paper is not redeemable or subject to voluntary prepayment by us prior to maturity.  We had no amounts outstanding under our commercial paper program as of December 31, 2013 and 2012.
	Revolving Credit Facility
	On May 7, 2013, we entered into the Fourth Amended and Restated Credit Agreement (the "Five-Year Credit Facility"), among Ensco, a subsidiary of Ensco, Citibank, N.A., as Administrative Agent, DNB Bank ASA, as Syndication Agent, and a syndicate of banks party thereto. The Five-Year Credit Facility provides for a $2.0 billion senior unsecured revolving credit facility to be used for general corporate purposes with a five-year term expiring on May 7, 2018. The Five-Year Credit Facility amends and restates our $1.45 billion credit agreement which was scheduled to mature on May 12, 2016. Advances under the Five-Year Credit Facility bear interest at Base Rate or LIBOR plus an applicable margin rate (currently 0.125% per annum for Base Rate advances and 1.125% per annum for LIBOR advances) depending on our credit rating. Amounts repaid may be re-borrowed during the term. We are required to pay a quarterly undrawn facility fee (currently 0.125% per annum) on the total $2.0 billion commitment, which is also based on our credit rating. In addition to other customary restrictive covenants, the Five-Year Credit Facility requires us to maintain a total debt to total capitalization ratio less than or equal to 50%. We have the right, subject to lender consent, to increase the commitments under the Five-Year Credit Facility to an aggregate amount of up to $2.5 billion. We had no amounts outstanding under the Five-Year Credit Facility as of December 31, 2013 and 2012.
	In connection with the amendment of our Five-Year Credit Facility, we terminated our $450.0 million 364-day revolving unsecured credit facility dated as of May 12, 2011. We had no amounts outstanding under the 364-Day Credit Facility as of December 31, 2012.
	Maturities
	The aggregate maturities of our debt, excluding net unamortized premiums of $283.7 million, as of December 31, 2013 were as follows (in millions):
	2014	$	47.5
	2015	47.5
	2016	1,019.70
	2017	4.5
	2018	4.5
	Thereafter	3,359.00
	Total	$	4,482.70
	Interest expense totaled $158.8 million, $123.6 million and $95.9 million for the years ended December 31, 2013, 2012 and 2011, respectively, which was net of interest amounts capitalized of $67.7 million, $105.8 million and $80.2 million in connection with our newbuild rig construction and other capital projects.

Derivative_Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivative Instruments	'
	DERIVATIVE INSTRUMENTS
	We use derivatives to reduce our exposure to various market risks, primarily foreign currency exchange rate risk. We maintain a foreign currency exchange rate risk management strategy that utilizes derivatives to reduce our exposure to unanticipated fluctuations in earnings and cash flows caused by changes in foreign currency exchange rates. We mitigate our credit risk relating to the counterparties of our derivatives by transacting with multiple, high-quality financial institutions, thereby limiting exposure to individual counterparties, and by entering into International Swaps and Derivatives Association, Inc. (“ISDA”) Master Agreements, which include provisions for a legally enforceable master netting agreement, with almost all of our derivative counterparties. See "Note 14 - Supplemental Financial Information" for additional information on the mitigation of credit risk relating to counterparties of our derivatives. We do not enter into derivatives for trading or other speculative purposes.
	All derivatives were recorded on our consolidated balance sheets at fair value. Derivatives subject to legally enforceable master netting agreements were not offset on our consolidated balance sheets. Accounting for the gains and losses resulting from changes in the fair value of derivatives depends on the use of the derivative and whether it qualifies for hedge accounting. See "Note 1 - Description of the Business and Summary of Significant Accounting Policies" for additional information on our accounting policy for derivatives and "Note 3 - Fair Value Measurements" for additional information on the fair value measurement of our derivatives.
	As of December 31, 2013 and 2012, our consolidated balance sheets included net foreign currency derivative assets of $1.8 million and $5.2 million, respectively.  All of our derivatives mature during the next 18 months.  Derivatives recorded at fair value on our consolidated balance sheets as of December 31, 2013 and 2012 consisted of the following (in millions):
		Derivative Assets						Derivative Liabilities
		2013				2012		2013		2012
	Derivatives Designated as Hedging Instruments
	Foreign currency forward contracts - current(1)	$	9.1			$	5	$	9.8	$	0.3
	Foreign currency forward contracts - non-current(2)	1.2				0.5		0.6		—
		10.3				5.5		10.4		0.3
	Derivatives not Designated as Hedging Instruments
	Foreign currency forward contracts - current(1)	2.5				0.2		0.6		0.2
		2.5				0.2		0.6		0.2
	Total	$	12.8			$	5.7	$	11	$	0.5
	(1)	Derivative assets and liabilities that have maturity dates equal to or less than 12 months from the respective balance sheet dates were included in other current assets and accrued liabilities and other, respectively, on our consolidated balance sheets.
	(2)	Derivative assets and liabilities that have maturity dates greater than 12 months from the respective balance sheet dates were included in other assets, net, and other liabilities, respectively, on our consolidated balance sheets.
	We utilize cash flow hedges to hedge forecasted foreign currency denominated transactions, primarily to reduce our exposure to foreign currency exchange rate risk associated with contract drilling expenses and capital expenditures denominated in various currencies.  As of December 31, 2013, we had cash flow hedges outstanding to exchange an aggregate $376.1 million for various foreign currencies, including $175.1 million for British pounds, $110.8 million for Brazilian reais, $35.3 million for Singapore dollars, $23.6 million for Australian dollars, $22.3 million for Euros and $9.0 million for other currencies.
	Gains and losses, net of tax, on derivatives designated as cash flow hedges included in our consolidated statements of income and comprehensive income for each of the years in the three-year period ended December 31, 2013 were as follows (in millions):
		(Loss) Gain Recognized in Other Comprehensive								(Loss) Gain									(Loss) Gain Recognized
		Income ("OCI")								Reclassified from									in Income on
		on Derivatives								AOCI into Income									Derivatives (Ineffective
		(Effective Portion)								(Effective Portion)(1)									Portion and Amount
																			Excluded from
																			Effectiveness Testing)(2)
		2013				2012		2011		2013			2012			2011			2013			2012			2011
	Interest rate lock contracts(3)	$	—			$	—	$	—	$	(.4	)	$	(.5	)	$	(.5	)	$	—		$	—		$	—
	Foreign currency forward contracts(4)	(5.8		)		8.7		0.1		(1.6		)	0.5			6			(.3		)	(.3		)	0.3
	Total	$	(5.8	)		$	8.7	$	0.1	$	(2.0	)	$	—		$	5.5		$	(.3	)	$	(.3	)	$	0.3
	-1	Changes in the fair value of cash flow hedges are recorded in AOCI.  Amounts recorded in AOCI associated with cash flow hedges are subsequently reclassified into contract drilling, depreciation or interest expense as earnings are affected by the underlying hedged forecasted transaction.
	(2)	Gains and losses recognized in income for ineffectiveness and amounts excluded from effectiveness testing were included in other, net, in our consolidated statements of income.
	(3)	Losses on interest rate lock derivatives reclassified from AOCI into income (effective portion) were included in interest expense, net in our consolidated statements of income.
	(4)	During the year ended December 31, 2013, $2.5 million of losses were reclassified from AOCI into contract drilling expense and $900,000 of gains were reclassified from AOCI into depreciation expense in our consolidated statement of income.
	We have net assets and liabilities denominated in numerous foreign currencies and use various methods to manage our exposure to foreign currency exchange rate risk. We predominantly structure our drilling contracts in U.S. dollars, which significantly reduces the portion of our cash flows and assets denominated in foreign currencies. We occasionally enter into derivatives that hedge the fair value of recognized foreign currency denominated assets or liabilities but do not designate such derivatives as hedging instruments. In these situations, a natural hedging relationship generally exists whereby changes in the fair value of the derivatives offset changes in the fair value of the underlying hedged items. As of December 31, 2013, we held derivatives not designated as hedging instruments to exchange an aggregate $208.9 million for various foreign currencies, including $97.9 million for Euros, $25.8 million for British pounds, $21.4 million for Swiss francs, $20.8 million for Brazilian reais, $16.5 million for Australian dollars, $13.9 million for Indonesian Rupiah and $12.6 million for other currencies.
	Net gains of $3.6 million, $1.5 million and $500,000 associated with our derivatives not designated as hedging instruments were included in other, net, in our consolidated statements of income for the years ended December 31, 2013, 2012 and 2011, respectively.
	As of December 31, 2013, the estimated amount of net losses associated with derivatives, net of tax, that will be reclassified to earnings during the next 12 months was as follows (in millions):
	Net unrealized (losses) to be reclassified to contract drilling expense		$	(1.7	)
	Net realized gains to be reclassified to depreciation expense		0.9
	Net realized (losses) to be reclassified to interest expense		(.4		)
	Net (losses) to be reclassified to earnings		$	(1.2	)

Shareholders_Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2013
Stockholders' Equity Note [Abstract]	'
Shareholders' Equity	'
	SHAREHOLDERS' EQUITY
	Activity in our various shareholders' equity accounts for each of the years in the three-year period ended December 31, 2013 was as follows (in millions):
		Shares	Par Value		Additional			Retained			AOCI			Treasury			Noncontrolling
					Paid-in			Earnings						Shares			Interest
					Capital
	BALANCE, December 31, 2010	150.1	$	15.1	$	637.1		$	5,305.00		$	11.1		$	(8.8	)	$	5.5
	Net income	—	—		—			600.4			—			—			5.2
	Cash dividends paid	—	—		—			(292.3		)	—			—			—
	Distributions to noncontrolling interests	—	—		—			—			—			—			(5.5		)
	Shares issued under share-based compensation plans, net	—	—		39.7			—			—			0.2			—
	Shares issued in connection with the Merger	85.8	8.6		4,568.90			—			—			—			—
	Fair value of share options assumed in connection with the Merger	—	—		35.4			—			—			—			—
	Equity issuance costs	—	—		(70.5		)	—			—			—			—
	Tax benefit from share-based compensation	—	—		0.5			—			—			—			—
	Repurchase of shares	—	—		—			—			—			(10.5		)	—
	Share-based compensation cost	—	—		41.9			—			—			—			—
	Net other comprehensive loss	—	—		—			—			(2.5		)	—			—
	BALANCE, December 31, 2011	235.9	23.7		5,253.00			5,613.10			8.6			(19.1		)	5.2
	Net income	—	—		—			1,169.70			—			—			7
	Cash dividends paid	—	—		—			(348.1		)	—			—			—
	Distributions to noncontrolling interests	—	—		—			—			—			—			(6.5		)
	Shares issued in connection with share-based compensation plans, net	1.8	0.2		35.3			—			—			(.1		)	—
	Equity issuance cost refunds	—	—		66.7			—			—			—			—
	Tax deficiency from share-based compensation	—	—		(1.0		)	—			—			—			—
	Repurchase of shares	—	—		—			—			—			(11.8		)	—
	Share-based compensation cost	—	—		44.7			—			—			—			—
	Net other comprehensive income	—	—		—			—			11.5			—			—
	BALANCE, December 31, 2012	237.7	23.9		5,398.70			6,434.70			20.1			(31.0		)	5.7
	Net income	—	—		—			1,418.20			—			—			9.7
	Cash dividends paid	—	—		—			(525.6		)	—			—			—
	Distributions to noncontrolling interests	—	—		—			—			—			—			(8.1		)
	Shares issued in connection with share-based compensation plans, net	1.9	0.2		21.8			—			—			(.1		)	—
	Tax benefit from share-based compensation	—	—		0.1			—			—			—			—
	Repurchase of shares	—	—		—			—			—			(14.1		)	—
	Share-based compensation cost	—	—		46.6			—			—			—			—
	Net other comprehensive loss	—	—		—			—			(1.9		)	—			—
	BALANCE, December 31, 2013	239.6	$	24.1	$	5,467.20		$	7,327.30		$	18.2		$	(45.2	)	$	7.3
	In May 2013, our shareholders approved a new share repurchase program. Subject to certain provisions under English law, including the requirement of Ensco plc to have sufficient distributable reserves, we may purchase up to a maximum of $2.0 billion in the aggregate under the program, but in no case more than 35.0 million shares. The program terminates in May 2018. As of December 31, 2013, there had been no share repurchases under this program.

Benefit_Plans

Benefit Plans	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Benefit Plans	'
	BENEFIT PLANS
	During 2012, our shareholders approved the 2012 Long-Term Incentive Plan (the “2012 LTIP”) effective January 1, 2012, to provide for the issuance of non-vested share awards, share option awards and performance awards (collectively "awards"). The 2012 LTIP is similar to and replaces the Company's previously adopted 2005 Long-Term Incentive Plan. Under the 2012 LTIP, 14.0 million shares were reserved for issuance as awards to officers, non-employee directors and key employees who are in a position to contribute materially to our growth, development and long-term success. As of December 31, 2013, there were 9.8 million shares available for issuance as awards under the 2012 LTIP. Awards may be satisfied by newly issued shares, including shares held by a subsidiary or affiliated entity, or by delivery of shares held in an affiliated employee benefit trust at the Company's discretion.
	Non-Vested Share Awards
	Grants of non-vested share awards generally vest at rates of 20% or 33% per year, as determined by a committee or subcommittee of the Board of Directors at the time of grant. Our non-vested share awards have voting and dividend rights effective on the date of grant. Compensation expense is measured using the market value of our shares on the date of grant and is recognized on a straight-line basis over the requisite service period (usually the vesting period).
	The following table summarizes non-vested share award related compensation expense recognized during each of the years in the three-year period ended December 31, 2013 (in millions):
		2013				2012				2011
	Contract drilling	$	21.3			$	17.1			$	17
	General and administrative	21.6				24.8				21.5
	Non-vested share award related compensation expense included in operating expenses	42.9				41.9				38.5
	Tax benefit	(5.4		)		(7.0		)		(6.9		)
	Total non-vested share award related compensation expense included in net income	$	37.5			$	34.9			$	31.6
	The following table summarizes the value of non-vested share awards granted and vested during each of the years in the three-year period ended December 31, 2013:
		2013				2012				2011
	Weighted-average grant-date fair value of	$	59.79			$	48.32			$	52.5
	non-vested share awards granted (per share)
	Total fair value of non-vested share awards	$	49.6			$	42.5			$	41
	vested during the period (in millions)
	The following table summarizes non-vested share award activity for the year ended December 31, 2013 (shares in thousands):
		Shares			Weighted-Average
					Grant-Date
					Fair Value
	Non-vested share awards as of December 31, 2012	2,491			$	46.52
	Granted	1,018			59.79
	Vested	(829	)		49.96
	Forfeited	(184	)		49.16
	Non-vested share awards as of December 31, 2013	2,496			$	52.95
	As of December 31, 2013, there was $100.5 million of total unrecognized compensation cost related to non-vested share awards, which is expected to be recognized over a weighted-average period of 2.2 years.
	Share Option Awards
	Share option awards ("options") granted to officers and employees generally become exercisable in 25% increments over a four-year period or 33% increments over a three-year period and, to the extent not exercised, expire on the seventh anniversary of the date of grant. Options granted to non-employee directors are immediately exercisable and, to the extent not exercised, expire on the seventh anniversary of the date of grant. The exercise price of options granted under the 2012 LTIP equals the market value of the underlying shares on the date of grant. As of December 31, 2013, options granted under predecessor or acquired plans to purchase 814,000 shares were outstanding under the 2012 LTIP.
	The following table summarizes option related compensation expense recognized during each of the years in the three-year period ended December 31, 2013 (in millions):
		2013				2012				2011
	General and administrative	$	0.8			$	1.6			$	2.5
	Option related compensation expense included in operating expenses	0.8				1.6				2.5
	Tax benefit	(.1		)		(.3		)		(.5		)
	Total option related compensation expense included in net income	$	0.7			$	1.3			$	2
	The fair value of each option is estimated on the date of grant using the Black-Scholes option valuation model.  We did not grant share option awards during the years ended December 31, 2013 and 2012. The following weighted-average assumptions were utilized in the Black-Scholes model for options granted during the year ended December 31, 2011:
			2011
	Risk-free interest rate		1.4	%
	Expected term (in years)		3.7
	Expected volatility		50.2	%
	Dividend yield		2.6	%
	Expected volatility is based on the historical volatility in the market price of our shares over the period of time equivalent to the expected term of the options granted. The expected term of options granted is derived from historical exercise patterns over a period of time equivalent to the contractual term of the options granted. We have not experienced significant differences in the historical exercise patterns among officers, employees and non-employee directors for them to be considered separately for valuation purposes. The risk-free interest rate is based on the implied yield of U.S. Treasury zero-coupon issues on the date of grant with a remaining term approximating the expected term of the options granted.
	The following table summarizes option activity for the year ended December 31, 2013 (shares and intrinsic value in thousands, term in years):
		Shares			Weighted-Average				Weighted-Average			Intrinsic
					Exercise Price				Contractual			Value
									Term
	Outstanding as of December 31, 2012	1,346			$	46.05
	Granted	—			—
	Exercised	(506	)		43.96
	Forfeited	—			—
	Expired	(26	)		51.24
	Outstanding as of December 31, 2013	814			$	47.18			2.5			$	9,065
	Exercisable as of December 31, 2013	780			$	46.85			2.4			$	8,986
	The following table summarizes the value of options granted and exercised during each of the years in the three-year period ended December 31, 2013:
		2013				2012				2011
	Weighted-average grant-date fair value of	$	—			$	—			$	19.05
	options granted (per share)
	Intrinsic value of options exercised during	$	8.7			$	17.8			$	17.2
	the year (in millions)
	The following table summarizes information about options outstanding as of December 31, 2013 (shares in thousands):
			Options Outstanding						Options Exercisable
			Number		Weighted-Average		Weighted-Average		Number		Weighted-Average
					Remaining
Exercise Prices		Outstanding		Contractual Life		Exercise Price		Exercisable		Exercise Price
$21.54 - $40.99		247		3.1 years		$33.51		247		$33.51
41.18 - 54.30		229		3.5 years		43.77		217		43.22
55.34 - 60.74		338		1.3 years		59.5		316		59.79
		814		2.5 years		$47.18		780		$46.85
As of December 31, 2013, there was $200,000 of total unrecognized compensation cost related to options, which is expected to be recognized over a weighted-average period of 0.3 years.
Performance Awards
Under the 2012 LTIP, performance awards may be issued to our senior executive officers. Performance awards granted prior to 2013 are payable in Ensco shares, cash or a combination thereof upon attainment of specified performance goals based on relative total shareholder return ("TSR") and absolute and relative return on capital employed ("ROCE"). Performance awards granted during 2013 are payable in Ensco shares upon attainment of specified performance goals based on relative TSR and relative ROCE. The performance goals are determined by a committee or subcommittee of the Board of Directors.
Performance awards generally vest at the end of a three-year measurement period based on attainment of performance goals. Our performance awards granted prior to 2013 are classified as liability awards with compensation expense measured based on the estimated probability of attainment of the specified performance goals and recognized on a straight-line basis over the requisite service period. The estimated probable outcome of attainment of the specified performance goals is based on historical experience, and any subsequent changes in this estimate are recognized as a cumulative adjustment to compensation cost in the period in which the change in estimate occurs. Our performance awards granted during 2013 are classified as equity awards with compensation expense recognized on a straight-line basis over the requisite service period. The estimated probable outcome of attainment of the specified performance goals is based on historical experience, and any subsequent changes in this estimate for the relative ROCE performance goal are recognized as a cumulative adjustment to compensation cost in the period in which the change in estimate occurs. The aggregate grant-date fair value of performance awards granted during 2013, 2012 and 2011 totaled $8.2 million, $7.2 million and $3.1 million, respectively. The aggregate fair value of performance awards vested during 2013, 2012 and 2011 totaled $7.4 million, $5.3 million and $5.6 million, respectively, all of which was paid in cash.
During the years ended December 31, 2013, 2012 and 2011, we recognized $6.6 million, $9.7 million and $6.7 million of compensation expense for performance awards, respectively, which was included in general and administrative expense in our consolidated statements of income.  As of December 31, 2013, there was $8.7 million of total unrecognized compensation cost related to unvested performance awards, which is expected to be recognized over a weighted-average period of 1.8 years.
Savings Plans
We have profit sharing plans (the "Ensco Savings Plan," the "Ensco Multinational Savings Plan" and the "Ensco Limited Retirement Plan"), which cover eligible employees, as defined within each plan.  The Ensco Savings Plan includes a 401(k) savings plan feature which allows eligible employees to make tax deferred contributions to the plan.  The Ensco Limited Retirement Plan also allows eligible employees to make tax deferred contributions to the plan. Contributions made to the Ensco Multinational Savings Plan may or may not qualify for tax deferral based on each plan participant's local tax requirements.
We generally make matching cash contributions to the plans.  We match 100% of the amount contributed by the employee up to a maximum of 5% of eligible salary. Matching contributions totaled $21.1 million, $16.5 million and $12.8 million for the years ended December 31, 2013, 2012 and 2011, respectively.  Profit sharing contributions made into the plans require approval of the Board of Directors and are generally paid in cash.  We recorded profit sharing contribution provisions of $55.3 million, $45.1 million and $21.1 million for the years ended December 31, 2013, 2012 and 2011, respectively.  Matching contributions and profit sharing contributions become vested in 33% increments upon completion of each initial year of service with all contributions becoming fully vested subsequent to achievement of three or more years of service.  We have 1.0 million shares reserved for issuance as matching contributions under the Ensco Savings Plan.

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets and Liabilities	12 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Other Intangible Assets and Liabilities	'
	GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES
	Goodwill
	The carrying amount of goodwill as of December 31, 2013 is detailed below by reporting unit (in millions):
	Floaters		$3,081.40
	Jackups	192.6
	Total		$3,274.00
	Drilling Contract Intangibles
	In connection with the Merger, we recorded intangible assets and liabilities representing the estimated fair values of the acquired company's firm drilling contracts in place at the Merger Date with favorable or unfavorable contract terms as compared to then-current market day rates for comparable drilling rigs. The gross carrying amounts of our drilling contract intangibles, which we consider to be definite-lived intangibles assets and intangible liabilities, and accumulated amortization as of December 31, 2013 and 2012 were as follows (in millions):
		December 31, 2013										December 31, 2012
		Gross Carrying Amount				Accumulated Amortization			Net Carrying Amount			Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Drilling contract intangible assets
	Balance, beginning of period	$	209			$	(88.3	)	$	120.7		$	209	$	(36.4	)	$	172.6
	Amortization	—				(42.3		)	(42.3		)	—		(51.9		)	(51.9		)
	Balance, end of period	$	209			$	(130.6	)	$	78.4		$	209	$	(88.3	)	$	120.7
	Drilling contract intangible liabilities
	Balance, beginning of period	$	278			$	(160.0	)	$	118		$	278	$	(92.8	)	$	185.2
	Amortization	—				(48.9		)	(48.9		)	—		(67.2		)	(67.2		)
	Balance, end of period	$	278			$	(208.9	)	$	69.1		$	278	$	(160.0	)	$	118
	The various factors considered in the determination of the fair values of our drilling contract intangibles were (1) the contracted day rate for each contract, (2) the remaining term of each contract, (3) the rig class and (4) the market conditions for each respective rig class at the Merger Date.  The intangible assets and liabilities were calculated based on the present value of the difference in cash inflows over the remaining contract term as compared to a hypothetical contract with the same remaining term at an estimated then-current market day rate using a risk-adjusted discount rate and an estimated effective income tax rate.
	We amortize the drilling contract intangibles to operating revenues over the respective remaining drilling contract terms on a straight-line basis. The estimated net (reduction) increase to future operating revenues related to the amortization of these intangible assets and liabilities as of December 31, 2013, is as follows (in millions):
	2014		$	(4.3	)
	2015		(4.5		)
	2016		(.8		)
	2017		0.3
	Total		$	(9.3	)

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]	'
Income Taxes	'
	INCOME TAXES
	We generated income of $173.4 million, $101.1 million and loss of $24.2 million from continuing operations before income taxes in the U.S. and $1.5 billion, $1.3 billion and $763.2 million of income from continuing operations before income taxes in non-U.S. countries for the years ended December 31, 2013, 2012 and 2011, respectively.
	The following table summarizes components of the provision for income taxes from continuing operations for each of the years in the three-year period ended December 31, 2013 (in millions):
		2013				2012				2011
	Current income tax expense:
	U.S.	$	94.2			$	45			$	36.4
	Non-U.S.	107.3				166				88.3
		201.5				211				124.7
	Deferred income tax expense (benefit):
	U.S.	19.8				29.6				(9.7		)
	Non-U.S.	(8.6		)		(2.5		)		(3.4		)
		11.2				27.1				(13.1		)
	Total income tax expense	$	212.7			$	238.1			$	111.6
	Deferred Taxes
	The following table summarizes significant components of deferred income tax assets (liabilities) as of December 31, 2013 and 2012 (in millions):
			2013				2012
	Deferred tax assets:
	Foreign tax credits		$	159			$	173.4
	Premium on long-term debt		111.9				124
	Net operating loss carryforwards		104				87.8
	Employee benefits, including share-based compensation		41.7				33.4
	Deferred revenue		19.4				22.7
	Other		19.8				24.5
	Total deferred tax assets		455.8				465.8
	Valuation allowance		(232.6		)		(227.1		)
	Net deferred tax assets		223.2				238.7
	Deferred tax liabilities:
	Property and equipment		(453.6		)		(472.9		)
	Intercompany transfers of property		(29.2		)		(32.2		)
	Deferred costs		(11.4		)		(20.9		)
	Other		(24.0		)		(31.3		)
	Total deferred tax liabilities		(518.2		)		(557.3		)
	Net deferred tax liability		$	(295.0	)		$	(318.6	)
	Net current deferred tax asset		$	20.9			$	13.8
	Net noncurrent deferred tax liability		(315.9		)		(332.4		)
	Net deferred tax liability		$	(295.0	)		$	(318.6	)
	Unrecognized tax benefits of $21.0 million associated with a tax position taken in tax years with NOL carryforwards were presented as a reduction of deferred tax assets in accordance with Financial Accounting Standards Board ("FASB") ASC Topic 740 Income Taxes.
	The realization of substantially all of our deferred tax assets is dependent on generating sufficient taxable income during future periods in various jurisdictions in which we operate. Realization of certain of our deferred tax assets is not assured. We recognize a valuation allowance for deferred tax assets when it is more-likely-than-not that the benefit from the deferred tax asset will not be realized. The amount of deferred tax assets considered realizable could increase or decrease in the near-term if our estimates of future taxable income change.
	As of December 31, 2013, we had deferred tax assets of $159.0 million for U.S. foreign tax credits (“FTC”) and $104.0 million related to $375.6 million of net operating loss (“NOL”) carryforwards, which can be used to reduce our income taxes payable in future years.  The FTC expires between 2017 and 2023.  NOL carryforwards, which were generated in various jurisdictions worldwide, include $231.4 million that do not expire and $144.2 million that will expire, if not utilized, beginning in 2014 through 2020.  Due to the uncertainty of realization, we have a $228.8 million valuation allowance on FTC and NOL carryforwards, primarily relating to countries where we no longer operate or do not expect to generate future taxable income.
	Effective Tax Rate
	Ensco plc, our parent company, is domiciled and resident in the U.K. Our subsidiaries conduct operations and earn income in numerous countries and are subject to the laws of taxing jurisdictions within those countries. The income of our non-U.K. subsidiaries is not subject to U.K. taxation. As a result of frequent changes in the taxing jurisdictions in which our drilling rigs are operated and/or owned, changes in the overall level of our income and changes in tax laws, our consolidated effective income tax rate may vary substantially from one reporting period to another. Our consolidated effective income tax rate on continuing operations for each of the years in the three-year period ended December 31, 2013, differs from the U.K. statutory income tax rate as follows:
		2013			2012			2011
	U.K. statutory income tax rate	23.3	%		24.5	%		26.5	%
	Non-U.K. taxes	(13.7	)		(17.3	)		(18.1	)
	Valuation allowance	1.9			4.8			4.7
	Net expense associated with uncertain tax positions and other adjustments relating to prior years	0.6			1			0.8
	Amortization of net deferred charges	0.1			0.4			0.8
	associated with intercompany rig sales
	Income taxes associated with restructuring transactions	—			3.7			—
	Other	0.6			(.1	)		0.4
	Effective income tax rate	12.8	%		17	%		15.1	%
	In December 2012, we completed the restructuring of certain subsidiaries of the acquired company and recognized $51.2 million of income tax expense in connection therewith.
	Our consolidated effective income tax rate for 2013 includes various discrete tax items. The majority of discrete tax expense recognized during 2013 was attributable to the recognition of a $7.4 million liability for taxes associated with a $30.6 million reimbursement from the resolution of a dispute with the Mexican tax authority and a $7.0 million increase in the valuation allowance on U.S. FTC resulting from a restructuring transaction in December 2013. Our consolidated effective income tax rate for 2012 also includes the impact of various discrete tax items. The majority of discrete tax expense recognized during 2012 was attributable to income tax expense associated with certain restructuring transactions in December 2012 and net income tax expense associated with liabilities for unrecognized tax benefits and other adjustments relating to prior years. Excluding the impact of the aforementioned discrete tax items, our consolidated effective income tax rate for the years ended December 31, 2013 and 2012 was 12.5% and 12.3%, respectively. The increase in our consolidated effective income tax rate, excluding discrete tax items, was due to the change in taxing jurisdictions in which our drilling rigs are operated and/or owned that resulted in an increase in the relative components of our earnings generated in taxing jurisdictions with higher tax rates.
	Our consolidated effective income tax rate for 2011 includes the impact of various discrete tax items. The majority of discrete tax expense recognized during 2011 was attributable to the recognition of a liability for unrecognized tax benefits associated with a tax position taken in a prior year. Excluding the impact of the aforementioned discrete tax items, our consolidated effective income tax rate for the year ended December 31, 2011 was 13.0%. The decrease in our 2012 consolidated effective income tax rate, excluding discrete tax items, to 12.3% from 13.0% in 2011 was due to unrecognized benefits related to net operating losses and foreign tax credits of certain acquired subsidiaries in 2011 and changes in taxing jurisdictions in which our drilling rigs are operated and/or owned that resulted in an increase in the relative components of our earnings generated in taxing jurisdictions with lower tax rates.
	Unrecognized Tax Benefits
	Our tax positions are evaluated for recognition using a more-likely-than-not threshold, and those tax positions requiring recognition are measured as the largest amount of tax benefit that is greater than 50% likely of being realized upon effective settlement with a taxing authority that has full knowledge of all relevant information.  As of December 31, 2013, we had $151.7 million of unrecognized tax benefits, of which $130.7 million was included in other liabilities on our consolidated balance sheet. Unrecognized tax benefits of $21.0 million associated with a tax position taken in tax years with NOL carryforwards were presented as a reduction of deferred tax assets in accordance with FASB ASC Topic 740 Income Taxes. If recognized, $127.4 million of our unrecognized tax benefits would impact our consolidated effective income tax rate. A reconciliation of the beginning and ending amount of unrecognized tax benefits for the years ended December 31, 2013 and 2012 is as follows (in millions):
			2013				2012
	Balance, beginning of year		$	110.7			$	53.6
	Increases in unrecognized tax benefits as a result		35.8				21.3
	of tax positions taken during prior years
	Increases in unrecognized tax benefits as a result		10				60.7
	of tax positions taken during the current year
	Decreases in unrecognized tax benefits as a result		(3.7		)		(.4		)
of tax positions taken during prior years
Settlements with taxing authorities		—				(4.1		)
Lapse of applicable statutes of limitations		(1.1		)		(20.8		)
Impact of foreign currency exchange rates		—				0.4
Balance, end of year		$	151.7			$	110.7
Accrued interest and penalties totaled $17.3 million and $18.9 million as of December 31, 2013 and 2012, respectively, and were included in other liabilities on our consolidated balance sheets. We recognized net benefits of $1.6 million, $2.8 million and $400,000 associated with interest and penalties during the years ended December 31, 2013, 2012 and 2011, respectively. Interest and penalties are included in current income tax expense in our consolidated statements of income.
Tax years as early as 2003 remain subject to examination in the major tax jurisdictions in which we operated. Ensco Delaware and Ensco United Incorporated, an indirect wholly-owned subsidiary of Ensco, participate in the U.S. Internal Revenue Service’s Compliance Assurance Process ("IRS CAP") which, among other things, provides for the resolution of tax issues in a timely manner and generally eliminates the need for lengthy post-filing examinations. The 2010, 2011 and 2012 U.S. federal tax returns of Ensco Delaware remain subject to examination under the IRS CAP.
Statutes of limitations applicable to certain of our tax positions lapsed during 2013, 2012 and 2011, resulting in net income tax benefits, inclusive of interest and penalties, of $3.1 million, $28.6 million and $4.2 million, respectively.
Statutes of limitations applicable to certain of our tax positions will lapse during 2014.  Therefore, it is reasonably possible that our unrecognized tax benefits will decline during the next 12 months by $2.3 million, inclusive of $900,000 of accrued interest and penalties, all of which would impact our consolidated effective income tax rate if recognized.
Intercompany Transfer of Drilling Rigs
Subsequent to the Merger, we transferred ownership of several acquired drilling rigs among our subsidiaries, including five drillships during 2011, one jackup rig during 2012 and two semisubmersible rigs during 2013.  The income tax liability associated with gains on the intercompany transfers of drilling rigs totaled $3.3 million and $10.3 million in 2012 and 2011, respectively. There was no income tax liability associated with the intercompany transfers of drilling rigs during 2013. The related income tax expense was deferred and is being amortized on a straight-line basis over the remaining useful lives of the associated rigs, which range from 15 to 35 years for the rigs transferred during 2012 and 2011. Similarly, the tax effects of $29.6 million of reversing temporary differences of the selling subsidiaries during 2011 also were deferred and are being amortized on the same basis and over the same periods as described above.
As of December 31, 2013 and 2012, the unamortized balance associated with deferred charges for income taxes incurred in connection with intercompany transfers of drilling rigs totaled $50.2 million and $58.3 million, respectively, and was included in other assets, net, on our consolidated balance sheets. Current income tax expense from continuing operations for the years ended December 31, 2013, 2012 and 2011 included $4.1 million, $9.1 million and $9.7 million, respectively, of amortization of income taxes incurred in connection with intercompany transfers of drilling rigs.
As of December 31, 2013 and 2012, the deferred tax liability associated with temporary differences of transferred drilling rigs totaled $29.2 million and $32.2 million, respectively, and was included in deferred income taxes on our consolidated balance sheets.  Deferred income tax expense from continuing operations for the years ended December 31, 2013, 2012 and 2011 included benefits of $2.4 million, $3.4 million and $3.8 million, respectively, of amortization of deferred reversing temporary differences associated with intercompany transfers of drilling rigs.
Undistributed Earnings
Dividend income received by Ensco plc from its subsidiaries is exempt from U.K. taxation. We do not provide deferred taxes on undistributed earnings of certain subsidiaries because our policy and intention is to reinvest such earnings indefinitely. Each of the subsidiaries for which we maintain such policy has significant net assets, liquidity, contract backlog and/or other financial resources available to meet operational and capital investment requirements and otherwise allow us to continue to maintain our policy of reinvesting the undistributed earnings indefinitely.
In December 2012, a U.S. subsidiary received $530.0 million in earnings distributions from two non-U.S. subsidiaries. There was no net U.S. tax liability on the earnings repatriation, as we utilized net operating loss carryforwards to offset the previously untaxed portion of the earnings distribution. The earnings distribution was made in consideration of unique circumstances, and our U.S. subsidiaries continue to have significant net assets, liquidity, contract backlog and other financial resources available to meet operational and capital investment requirements. Accordingly, this distribution does not change, and we continue to maintain, our policy and intention to reinvest the undistributed earnings of the two aforementioned subsidiaries indefinitely.
As of December 31, 2013, the aggregate undistributed earnings of the subsidiaries for which we maintain a policy and intention to reinvest earnings indefinitely totaled $2.1 billion. Should we make a distribution from these subsidiaries in the form of dividends or otherwise, we would be subject to additional income taxes. The unrecognized deferred tax liability related to these undistributed earnings was not practicable to estimate as of December 31, 2013.

Discontinued_Operations

Discontinued Operations	12 Months Ended
	Dec. 31, 2013
Discontinued Operations and Disposal Groups [Abstract]	'
Discontinued Operations	'
	DISCONTINUED OPERATIONS
	We sold the following rigs during the three-year period ended December 31, 2013 (in millions):
	Rig	Date of Rig Sale		Segment(1)	Net Proceeds			Net Book Value(2)			Pre-tax (Loss)/Gain(3)
	Pride Pennsylvania	Mar-13		Jackups	$	15.5		$	15.7		$	(.2	)
	ENSCO 5003	Dec-12		Floaters	68.2			89.4			(21.2		)
	Pride Hawaii	Oct-12		Jackups	18.8			16.8			2
	ENSCO I	Sep-12		Other	4.5			12.3			(7.8		)
	ENSCO 61	Jun-12		Jackups	31.7			19.6			12.1
	ENSCO 59	May-12		Jackups	22.8			21.9			0.9
	ENSCO 95	Jun-11		Jackups	41.5			28.8			12.7
					$	203		$	204.5		$	(1.5	)
	(1) The rigs' operating results were reclassified to discontinued operations in our consolidated statements of income for each of the years in the three-year period ended December 31, 2013 and were previously included within the operating segment noted in the above table.
	(2) Includes the rig's net book value as well as inventory and other assets on the date of the sale.
	(3) The pre-tax (loss)/gain was included in loss from discontinued operations, net in our consolidated statement of income in the year of sale. Income tax expense of $900,000 and $10.9 million was recognized in connection with the sale of assets during the years ended December 31, 2013 and December 31, 2011, respectively. There was no net income tax expense recognized in connection with the sale of assets during the year ended December 31, 2012.
	During the quarter ended June 30, 2014, management committed to a plan to sell five floaters. The ENSCO 5000, ENSCO 5001, ENSCO 5002, ENSCO 6000 and ENSCO 7500 were removed from our portfolio of rigs marketed for contract drilling services and are being actively marketed for sale. The operating results from these rigs were included in (loss) income from discontinued operations, net in our consolidated statement of income for the three-year period ended December 31, 2013.
	In connection with the sale of the ENSCO 7500, we will be required to pay the outstanding principal on the 6.36% MARAD bonds due 2015, which are collateralized by this rig. The outstanding principal balance on this bond is $25.3 million as of December 31, 2013, of which $12.7 million is included in current maturities of long-term debt on our consolidated balance sheet as of December 31, 2013.
	During the quarter ended June 30, 2014, we sold ENSCO 85 for net proceeds of $64.4 million. ENSCO 85 operating results were included in (loss) income from discontinued operations, net in our consolidated statement of income for the three-year period ended December 31, 2013.
	During the quarter ended March 31, 2014, we sold ENSCO 69 and Pride Wisconsin for net proceeds of $32.2 million. These rigs were classified as held for sale on our consolidated balance sheet as of December 31, 2013. The proceeds from the sale were received in December 2013 and included in net cash used in investing activities of discontinued operations in our consolidated statement of cash flows for the year ended December 31, 2013. ENSCO 69 and Pride Wisconsin operating results were included in (loss) income from discontinued operations, net in our consolidated statement of income for the three-year period ended December 31, 2013.
	During 2012, we classified Pride Pennsylvania as held for sale and the rig was written down to fair value less estimated cost to sell. We recognized a $2.5 million loss, which was included in (loss) income from discontinued operations, net in our consolidated statement of income during the year ended December 31, 2012.
	The following table summarizes (loss) income from discontinued operations for each of the years in the three-year period ended December 31, 2013 (in millions):
		2013			2012			2011
	Revenues	$	399.9		$	438.2		$	243.5
	Operating expenses	412.6			406.9			258.7
	Operating (loss) income	(12.7		)	31.3			(15.2		)
	Other income	0.3			1.3			0.2
	Income tax (expense) benefit	(10.6		)	1			(8.6		)
	(Loss) gain on disposal of discontinued operations, net	(1.1		)	(16.5		)	1.8
	(Loss) income from discontinued operations	$	(24.1	)	$	17.1		$	(21.8	)
	Debt and interest expense are not allocated to our discontinued operations.
	During 2008, ENSCO 74 was lost as a result of Hurricane Ike in the U.S. Gulf of Mexico. The owner of a pipeline filed claims alleging that ENSCO 74 caused the pipeline to rupture during Hurricane Ike. We incurred $3.6 million in professional fees in connection with this matter, which we applied against our $10.0 million per occurrence deductible under our liability insurance policy.
	In February 2014, we reached an agreement in principle to settle with the pipeline owner for $9.6 million. Accordingly, we recorded a $6.4 million charge for our remaining obligation under our liability insurance policy in loss from discontinued operations in our consolidated statement of income for the year ended December 31, 2013. The remaining $3.2 million was settled by our underwriters. See "Note 12 - Commitments and Contingencies" for additional information on the ENSCO 74 loss.

Commitments_And_Contingencies

Commitments And Contingencies	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments And Contingencies	'
	COMMITMENTS AND CONTINGENCIES
	Leases
	We are obligated under leases for certain of our offices and equipment.  Rental expense relating to operating leases was $53.6 million, $47.5 million and $31.5 million during the years ended December 31, 2013, 2012 and 2011, respectively. Future minimum rental payments under our noncancellable operating lease obligations are as follows:  $36.9 million during 2014; $20.1 million during 2015; $10.3 million during 2016; $9.5 million during 2017; $9.6 million during 2018 and $63.7 million thereafter.
	Capital Commitments
	The following table summarizes the cumulative amount of contractual payments made as of December 31, 2013 for our rigs under construction and estimated timing of our remaining contractual payments (in millions):
			Cumulative Paid(1)		2014		2015		2016		Total(2)
	ENSCO DS-8		161.4		383.2		—		—		544.6
	ENSCO DS-9		157.4		373.2		—		—		530.6
	ENSCO DS-10		103		103		307.4		—		513.4
	ENSCO 110		41		—		166.1		—		207.1
	ENSCO 122		49		202		—		—		251
	ENSCO 123		53.5		—		—		213.8		267.3
			$	565.3	$	1,061.40	$	473.5	$	213.8	$	2,314.00
	-1	Cumulative paid represents the aggregate amount of contractual payments made from commencement of the construction agreement through December 31, 2013.
	-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.
	Future contractual payments for rig enhancement projects, which are not reflected in the table above, are $94.2 million. We currently estimate these payments will be made during 2014.
	The actual timing of these expenditures may vary based on the completion of various construction milestones, which are, to a large extent, beyond our control.
	ENSCO 74 Loss
	During 2008, ENSCO 74 was lost as a result of Hurricane Ike in the U.S. Gulf of Mexico.  Portions of its legs remained underwater adjacent to the customer's platform, and the sunken rig hull of ENSCO 74 was located approximately 95 miles from the original drilling location when it was struck by an oil tanker during 2009.  Wreck removal operations on the sunken rig hull of ENSCO 74 were completed during 2010.
	During 2012, we entered into an agreement with the customer pursuant to which, among other matters, the customer agreed to remove the legs. Regardless of the actual removal costs incurred by the customer, we agreed to pay $19.0 million in nine installments upon the completion of certain milestones during the removal. We have insurance coverage for the actual removal costs incurred by the customer.
	We have paid $19.0 million to the customer and received $18.5 million in insurance reimbursements through December 31, 2013. Our consolidated balance sheet as of December 31, 2013 included a $500,000 receivable for recovery of related costs under our insurance policy in other assets, net.
	We filed a petition for exoneration or limitation of liability under U.S. admiralty and maritime law during 2009. A number of claimants presented claims in the exoneration/limitation proceedings. Currently, only three claimants remain. We have liability insurance policies that provide coverage for such claims as well as removal of wreckage and debris in excess of the property insurance policy sublimit, subject to a $10.0 million per occurrence deductible for third-party claims and an annual aggregate limit of $490.0 million.
	The owner of the oil tanker that struck the hull of ENSCO 74 filed claims seeking monetary damages currently in excess of $5.0 million for losses incurred when the tanker struck the sunken hull of ENSCO 74. The owner of a pipeline filed claims alleging that ENSCO 74 caused the pipeline to rupture during Hurricane Ike and sought damages for the cost of repairs and business interruption in an amount in excess of $26.0 million. We have reached an agreement in principle with the owner of the pipeline to settle the claims for $9.6 million. Prior to the settlement we incurred legal fees of $3.6 million for this matter. Accordingly, we accrued a $6.4 million liability as of December 31, 2013 for the remainder of our deductible under our liability insurance policy, which was included in accrued liabilities and other on our consolidated balance sheet. The remaining $3.2 million was paid by underwriters. Based on information currently available, primarily the adequacy of available defenses, we have not concluded that it is probable a liability exists with respect to the claim by the owner of the oil tanker.
	We believe all liabilities associated with the ENSCO 74 loss during Hurricane Ike resulted from a single occurrence under the terms of the applicable insurance policies. However, legal counsel for certain liability underwriters have asserted that the liability claims arise from separate occurrences. In the event of multiple occurrences, the deductible is $15.0 million for two occurrences and $1.0 million for each occurrence thereafter.
	Although we do not expect final disposition of the claims associated with the ENSCO 74 loss to have a material adverse effect upon our financial position, operating results or cash flows, there can be no assurances as to the ultimate outcome.
	Asbestos Litigation
	We and certain subsidiaries have been named as defendants, along with numerous third-party companies as co-defendants, in multi-party lawsuits filed in Mississippi and Louisiana by approximately 100 plaintiffs. The lawsuits seek an unspecified amount of monetary damages on behalf of individuals alleging personal injury or death, primarily under the Jones Act, purportedly resulting from exposure to asbestos on drilling rigs and associated facilities during the 1960s through the 1980s.
	In December 2013, we reached an agreement in principle with 58 of the plaintiffs to settle lawsuits filed in Mississippi for a nominal amount. While we believe the special master's recommendations will be accepted by the plaintiffs and approved by the Court, there can be no assurances as to the ultimate outcome.
	We intend to vigorously defend against the remaining claims and have filed responsive pleadings preserving all defenses and challenges to jurisdiction and venue. However, discovery is still ongoing and, therefore, available information regarding the nature of all pending claims is limited. At present, we cannot reasonably determine how many of the claimants may have valid claims under the Jones Act or estimate a range of potential liability exposure, if any.
	In addition to the pending cases in Mississippi and Louisiana, we have other asbestos or lung injury claims pending against us in litigation in other jurisdictions. Although we do not expect final disposition of these asbestos or lung injury lawsuits to have a material adverse effect upon our financial position, operating results or cash flows, there can be no assurances as to the ultimate outcome of the lawsuits.
	Other Matters
	In addition to the foregoing, we are named defendants or parties in certain other lawsuits, claims or proceedings incidental to our business and are involved from time to time as parties to governmental investigations or proceedings, including matters related to taxation, arising in the ordinary course of business. Although the outcome of such lawsuits or other proceedings cannot be predicted with certainty and the amount of any liability that could arise with respect to such lawsuits or other proceedings cannot be predicted accurately, we do not expect these matters to have a material adverse effect on our financial position, operating results or cash flows.
	In the ordinary course of business with customers and others, we have entered into letters of credit and surety bonds to guarantee our performance as it relates to our drilling contracts, contract bidding, customs duties, tax appeals and other obligations in various jurisdictions. Letters of credit and surety bonds outstanding as of December 31, 2013 totaled $232.3 million and are issued under facilities provided by various banks and other financial institutions. Obligations under these letters of credit and surety bonds are not normally called, as we typically comply with the underlying performance requirement. As of December 31, 2013, we had not been required to make collateral deposits with respect to these agreements.

Segment_Information

Segment Information	12 Months Ended
	Dec. 31, 2013
Segment Reporting Information, Revenue for Reportable Segment [Abstract]	'
Segment Information	'
	SEGMENT INFORMATION
	Our business consists of three operating segments: (1) Floaters, which includes our drillships and semisubmersible rigs, (2) Jackups and (3) Other, which consists of management services on rigs owned by third-parties. Our two reportable segments, Floaters and Jackups, provide one service, contract drilling.
	Segment information for each of the years in the three-year period ended December 31, 2013 is presented below (in millions).  General and administrative expense and depreciation expense incurred by our corporate office are not allocated to our operating segments for purposes of measuring segment operating income and were included in "Reconciling Items."  We measure segment assets as property and equipment.
	Year Ended December 31, 2013
		Floaters			Jackups		Other		Operating Segments Total		Reconciling Items			Consolidated Total
	Revenues	$	2,760.80		$	1,684.00	$	75.1	$	4,519.90	$	—		$	4,519.90
	Operating expenses
	Contract drilling	1,209.70			811.9		58.5		2,080.10		—			2,080.10
	(exclusive of depreciation)
	Depreciation	364.8			156.9		—		521.7		6.5			528.2
	General and administrative	—			—		—		—		146.8			146.8
	Operating income (loss)	$	1,186.30		$	715.2	$	16.6	$	1,918.10	$	(153.3	)	$	1,764.80
	Property and equipment, net	$	11,303.40		$	2,961.60	$	—	$	14,265.00	$	46		$	14,311.00
	Capital expenditures	$	1,031.30		$	710.6	$	—	$	1,741.90	$	26.6		$	1,768.50
	Year Ended December 31, 2012
		Floaters			Jackups		Other		Operating Segments Total		Reconciling Items			Consolidated Total
	Revenues	$	2,300.80		$	1,485.60	$	82.8	$	3,869.20	$	—		$	3,869.20
	Operating expenses
	Contract drilling	956			730.8		61.1		1,747.90		—			1,747.90
	(exclusive of depreciation)
	Depreciation	305.7			161.5		—		467.2		8.9			476.1
	General and administrative	—			—		—		—		148.9			148.9
	Operating income (loss)	$	1,039.10		$	593.3	$	21.7	$	1,654.10	$	(157.8	)	$	1,496.30
	Property and equipment, net	$	10,727.60		$	2,389.80	$	—	$	13,117.40	$	28.2		$	13,145.60
	Capital expenditures	$	1,520.10		$	192.2	$	—	$	1,712.30	$	2.7		$	1,715.00
	Year Ended December 31, 2011
		Floaters			Jackups		Other		Operating Segments Total		Reconciling Items			Consolidated Total
	Revenues	$	1,352.60		$	1,194.20	$	52.4	$	2,599.20	$	—		$	2,599.20
	Operating expenses
	Contract drilling	630.2			613		42.9		1,286.10		—			1,286.10
	(exclusive of depreciation)
	Depreciation	189.1			164.1		—		353.2		4.4			357.6
	General and administrative	—			—		—		—		158.6			158.6
	Operating income (loss)	$	533.3		$	417.1	$	9.5	$	959.9	$	(163.0	)	$	796.9
	Property and equipment, net	$	9,923.60		$	2,462.40	$	12.8	$	12,398.80	$	23.1		$	12,421.90
	Capital expenditures	$	355.4		$	276.3	$	—	$	631.7	$	14		$	645.7
	Information about Geographic Areas
	As of December 31, 2013, our Floaters segment consisted of seven drillships, 13 dynamically positioned semisubmersible rigs and six moored semisubmersible rigs deployed in various locations throughout North and South America, Middle East and Africa, Asia Pacific, Europe and Mediterranean and Brazil. Additionally, our Floaters segment consisted of three ultra-deepwater drillships under construction in South Korea.  Our Jackups segment consisted of 47 jackup rigs, of which 44 were deployed in various locations throughout North and South America, Middle East and Africa, Asia Pacific and Europe and Mediterranean, and three were under construction in Singapore.
	As of December 31, 2013, the geographic distribution of our drilling rigs by operating segment was as follows:
		Floaters(1)		Jackups(1)	Total(1)(2)
	North & South America (excluding Brazil)	8		14	22
	Middle East & Africa	6		10	16
	Asia & Pacific Rim	3		10	13
	Europe & Mediterranean	2		10	12
	Brazil	7		—	7
	Asia & Pacific Rim (under construction)	3		3	6
	Total	29		47	76
	(1)	The table above includes the five floaters classified as "held for sale" as of June 30, 2014, as well as ENSCO 69, Pride Wisconsin and ENSCO 85 which were sold during 2014.
	(2)	We provide management services on two rigs owned by third-parties not included in the table above.
	For purposes of our geographic disclosure, we attribute revenues to the geographic location where such revenues are earned and assets to the geographic location of the drilling rig as of the end of the applicable year. For new construction projects, assets are attributed to the location of future operation if known or to the location of construction if the ultimate location of operation is undetermined. Information by country for those countries that account for more than 10% of total revenues or 10% of our long-lived assets was as follows (in millions):
		Revenues							Long-lived Assets
		2013			2012		2011		2013		2012			2011
	United States	$	1,724.90		$	1,291.30	$	753.8	$	4,617.80	$	4,525.90		$	3,450.60
	Brazil	683.7			776.3		430.9		2,447.50		2,911.30			3,101.80
	Angola	467.1			341.6		209.5		2,543.70		2,147.20			1,347.90
	Other countries	1,644.20			1,460.00		1,205.00		4,702.00		3,561.20			4,521.60
	Total	$	4,519.90		$	3,869.20	$	2,599.20	$	14,311.00	$	13,145.60		$	12,421.90

Supplemental_Financial_Informa

Supplemental Financial Information	12 Months Ended
	Dec. 31, 2013
Supplemental Financial Information [Abstract]	'
Supplemental Financial Information	'
	SUPPLEMENTAL FINANCIAL INFORMATION
	Consolidated Balance Sheet Information
	Accounts receivable, net, as of December 31, 2013 and 2012 consisted of the following (in millions):
			2013				2012
	Trade		$	869.8			$	812.4
	Other		14.3				18.2
			884.1				830.6
	Allowance for doubtful accounts		(28.4		)		(19.2		)
			$	855.7			$	811.4
	The liquidity of OGX Petróleo e Gás Participações S.A. ("OGX") deteriorated during the second half of 2013, and on October 30, 2013, OGX filed for bankruptcy protection in Brazil. We did not recognize revenue for drilling services provided to OGX during the second half of 2013 as we concluded collectability of these amounts was not reasonably assured. Additionally, we recorded a $14.2 million provision for doubtful accounts during the year ended December 31, 2013 for receivables related to drilling services provided through June 30, 2013. Our receivables with OGX were fully reserved on our consolidated balance sheet as of December 31, 2013.
	Other current assets as of December 31, 2013 and 2012 consisted of the following (in millions):
			2013				2012
	Inventory		$	256.4			$	207.8
	Prepaid taxes		88.1				62.2
	Short-term investments		50				50
	Deferred costs		47.4				46.9
	Deferred tax assets		23.1				14.6
	Prepaid expenses		18.5				20.3
	Derivative assets		11.6				5.2
	Assets held for sale		8.6				14.2
	Other		10.2				4.2
			$	513.9			$	425.4
	Other assets, net, as of December 31, 2013 and 2012 consisted of the following (in millions):
			2013				2012
	Intangible assets		$	83.8			$	143.3
	Deferred costs		59.1				45.2
	Unbilled receivables		51.9				77.1
	Prepaid taxes on intercompany transfers of property		50.2				58.3
	Supplemental executive retirement plan assets		37.7				29.8
	Warranty and other claim receivables		30.6				30.6
	Deferred tax assets		25.2				19.3
	Wreckage and debris removal receivables		0.5				13.2
	Other		13.7				5
			$	352.7			$	421.8
	Accrued liabilities and other as of December 31, 2013 and 2012 consisted of the following (in millions):
			2013				2012
	Personnel costs		$	242			$	231.1
	Deferred revenue		169.8				146.9
	Taxes		84.2				86.9
	Accrued interest		68				67.9
	Advance payment received on sale of assets		33				—
	Customer pre-payments		20				—
	Wreckage and debris removal		—				9
	Other		41.7				42.6
			$	658.7			$	584.4
	Other liabilities as of December 31, 2013 and 2012 consisted of the following (in millions):
			2013				2012
	Deferred revenue		$	217.6			$	224.5
	Unrecognized tax benefits (inclusive of interest and penalties)		148				129.6
	Intangible liabilities		69.1				118
	Supplemental executive retirement plan liabilities		40.5				33.3
	Personnel costs		37.2				31.6
	Other		33.3				36.4
			$	545.7			$	573.4
	Accumulated other comprehensive income as of December 31, 2013 and 2012 consisted of the following (in millions):
		2013				2012
	Derivative Instruments	$	20.6			$	24.4
	Other	(2.4		)		(4.3		)
		$	18.2			$	20.1
	Consolidated Statement of Income Information
	Repair and maintenance expense related to continuing operations for each of the years in the three-year period ended December 31, 2013 was as follows (in millions):
			2013				2012			2011
	Repair and maintenance expense		$	311.7			$	294.7		$	223.6
Consolidated Statement of Cash Flows Information
Net cash provided by operating activities of continuing operations attributable to the net change in operating assets and liabilities for each of the years in the three-year period ended December 31, 2013 was as follows (in millions):
		2013				2012			2011
(Increase) decrease in other assets		$	(98.4	)		$	68.3		$	6.7
(Decrease) increase in liabilities		(10.6		)		312			(33.9		)
(Increase) decrease in accounts receivable		(29.3		)		46.1			(215.9		)
		$	(138.3	)		$	426.4		$	(243.1	)
Cash paid for interest and income taxes of continuing operations for each of the years in the three-year period ended December 31, 2013 was as follows (in millions):
		2013				2012			2011
Interest, net of amounts capitalized		$	182.2			$	150.7		$	28.6
Income taxes		203.9				88.1			113.7
Capitalized interest totaled $67.7 million, $105.8 million and $80.2 million during the years ended December 31, 2013, 2012 and 2011, respectively. Capital expenditure accruals totaling $113.9 million, $111.1 million and $303.7 million for the years ended December 31, 2013, 2012 and 2011, respectively, were excluded from investing activities in our consolidated statements of cash flows.
Amortization of intangibles and other, net, included amortization of intangible assets and liabilities related to the estimated fair values of acquired Company firm drilling contracts in place at the Merger Date, debt premiums related to the fair value adjustment of acquired Company debt instruments, deferred charges for income taxes incurred on intercompany transfers of drilling rigs and certain other deferred costs.
Concentration of Risk
We are exposed to credit risk relating to our receivables from customers, our cash and cash equivalents and investments and our use of derivatives in connection with the management of foreign currency exchange rate risk. We mitigate our credit risk relating to receivables from customers, which consist primarily of major international, government-owned and independent oil and gas companies, by performing ongoing credit evaluations. We also maintain reserves for potential credit losses, which generally have been within management's expectations. We mitigate our credit risk relating to cash and investments by focusing on diversification and quality of instruments. Cash equivalents and short-term investments consist of a portfolio of high-grade instruments. Custody of cash and cash equivalents and short-term investments is maintained at several well-capitalized financial institutions, and we monitor the financial condition of those financial institutions.
We mitigate our credit risk relating to counterparties of our derivatives through a variety of techniques, including transacting with multiple, high-quality financial institutions, thereby limiting our exposure to individual counterparties and by entering into ISDA Master Agreements, which include provisions for a legally enforceable master netting agreement, with almost all of our derivative counterparties. The terms of the ISDA agreements may also include credit support requirements, cross default provisions, termination events, or set-off provisions. Legally enforceable master netting agreements reduce credit risk by providing protection in bankruptcy in certain circumstances and generally permitting the closeout and netting of transactions with the same counterparty upon the occurrence of certain events.
During the years ended December 31, 2013, 2012 and 2011, Petrobras, our largest customer, accounted for $604.8 million, $788.2 million and $364.5 million, or 13%, 20% and 14%, of consolidated revenues, respectively, all of which were attributable to our Floaters segment.
During the year ended December 31, 2013, revenues provided by our drilling operations in the U. S. Gulf of Mexico totaled $1.7 billion, or 38%, of consolidated revenues, of which 75% were attributable to our Floaters segment. Revenues provided by our drilling operations in Brazil and Angola during the year ended December 31, 2013 totaled $683.7 million and 467.1 million, or 15% and 10%, respectively, of consolidated revenues, all of which were attributable to our Floaters segment.

Guarantee_Of_Registered_Securi

Guarantee Of Registered Securities	12 Months Ended
	Dec. 31, 2013
Guarantees [Abstract]	'
Guarantee Of Registered Securities	'
	GUARANTEE OF REGISTERED SECURITIES
	In connection with the Merger, Ensco plc and Pride entered into a supplemental indenture to the indenture dated as of July 1, 2004 between Pride and the Bank of New York Mellon, as indenture trustee, providing for, among other matters, the full and unconditional guarantee by Ensco plc of Pride’s 8.5% senior notes due 2019, 6.875% senior notes due 2020 and 7.875% senior notes due 2040, which had an aggregate outstanding principal balance of $1.7 billion as of December 31, 2013. The Ensco plc guarantee provides for the unconditional and irrevocable guarantee of the prompt payment, when due, of any amount owed to the holders of the notes.
	Ensco plc is also a full and unconditional guarantor of the 7.2% Debentures due 2027 issued by Ensco Delaware in November 1997, which had an aggregate outstanding principal balance of $150.0 million as of December 31, 2013.
	All guarantees are unsecured obligations of Ensco plc ranking equal in right of payment with all of its existing and future unsecured and unsubordinated indebtedness.
	The following tables present our condensed consolidating statements of income for each of the years in the three-year period ended December 31, 2013; our condensed consolidating statements of comprehensive income for each of the years in the three-year period ended December 31, 2013; our condensed consolidating balance sheets as of December 31, 2013 and 2012; and our condensed consolidating statements of cash flows for each of the years in the three-year period ended December 31, 2013, in accordance with Rule 3-10 of Regulation S-X.
	ENSCO PLC AND SUBSIDIARIES
	CONDENSED CONSOLIDATING STATEMENTS OF INCOME
	Year Ended December 31, 2013
	(in millions)
		Ensco plc			ENSCO International Incorporated			Pride International, Inc.			Other Non-guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
	OPERATING REVENUES	$	35		$	149.4		$	—		$	4,642.90		$	(307.4	)	$	4,519.90
	OPERATING EXPENSES
	Contract drilling (exclusive of depreciation)	27.5			149.4			—			2,210.60			(307.4		)	2,080.10
	Depreciation	0.3			4			—			523.9			—			528.2
	General and administrative	63.5			0.5			—			82.8			—			146.8
	OPERATING (LOSS) INCOME	(56.3		)	(4.5		)	—			1,825.60			—			1,764.80
	OTHER (EXPENSE) INCOME, NET	(65.6		)	(9.4		)	(27.9		)	2.8			—			(100.1		)
	(LOSS) INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(121.9		)	(13.9		)	(27.9		)	1,828.40			—			1,664.70
	INCOME TAX PROVISION	—			92.5			—			120.2			—			212.7
	DISCONTINUED OPERATIONS, NET	—			—			—			(24.1		)	—			(24.1		)
	EQUITY EARNINGS IN AFFILIATES, NET OF TAX	1,540.10			366.2			111.6			—			(2,017.9		)	—
	NET INCOME	1,418.20			259.8			83.7			1,684.10			(2,017.9		)	1,427.90
	NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—			—			—			(9.7		)	—			(9.7		)
	NET INCOME ATTRIBUTABLE TO ENSCO	$	1,418.20		$	259.8		$	83.7		$	1,674.40		$	(2,017.9	)	$	1,418.20
	ENSCO PLC AND SUBSIDIARIES
	CONDENSED CONSOLIDATING STATEMENTS OF INCOME
	Year Ended December 31, 2012
	(in millions)
		Ensco plc			ENSCO International Incorporated			Pride International, Inc.			Other Non-guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
	OPERATING REVENUES	$	44		$	147.6		$	—		$	3,997.70		$	(320.1	)	$	3,869.20
	OPERATING EXPENSES
	Contract drilling (exclusive of depreciation)	51.2			147.6			—			1,869.20			(320.1		)	1,747.90
	Depreciation	0.4			3.5			—			472.2			—			476.1
	General and administrative	63.8			0.4			—			84.7			—			148.9
	OPERATING (LOSS) INCOME	(71.4		)	(3.9		)	—			1,571.60			—			1,496.30
	OTHER (EXPENSE) INCOME, NET	(41.8		)	(7.0		)	(50.0		)	0.2			—			(98.6		)
	(LOSS) INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(113.2		)	(10.9		)	(50.0		)	1,571.80			—			1,397.70
	INCOME TAX PROVISION	—			68.8			—			169.3			—			238.1
	DISCONTINUED OPERATIONS, NET	—			—			—			17.1			—			17.1
	EQUITY EARNINGS IN AFFILIATES, NET OF TAX	1,282.90			335.9			239.2			—			(1,858.0		)	—
	NET INCOME	1,169.70			256.2			189.2			1,419.60			(1,858.0		)	1,176.70
	NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—			—			—			(7.0		)	—			(7.0		)
	NET INCOME ATTRIBUTABLE TO ENSCO	$	1,169.70		$	256.2		$	189.2		$	1,412.60		$	(1,858.0	)	$	1,169.70
	ENSCO PLC AND SUBSIDIARIES
	CONDENSED CONSOLIDATING STATEMENTS OF INCOME
	Year Ended December 31, 2011
	(in millions)
		Ensco plc			ENSCO International Incorporated			Pride International, Inc.			Other Non-guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
	OPERATING REVENUES	$	—		$	70		$	—		$	2,671.00		$	(141.8	)	$	2,599.20
	OPERATING EXPENSES
	Contract drilling (exclusive of depreciation)	46.9			70			—			1,311.00			(141.8		)	1,286.10
	Depreciation	0.4			1.8			—			355.4			—			357.6
	General and administrative	52.2			—			—			106.4			—			158.6
	OPERATING (LOSS) INCOME	(99.5		)	(1.8		)	—			898.2			—			796.9
	OTHER INCOME (EXPENSE), NET	32.1			0.4			(22.7		)	(67.7		)	—			(57.9		)
	(LOSS) INCOME BEFORE INCOME TAXES	(67.4		)	(1.4		)	(22.7		)	830.5			—			739
	INCOME TAX PROVISION	—			38.5			1.5			71.6			—			111.6
	DISCONTINUED OPERATIONS, NET	—			(11.1		)	—			(10.7		)				(21.8		)
	EQUITY EARNINGS IN AFFILIATES, NET OF TAX	667.8			271.5			143.9			—			(1,083.2		)	—
	NET INCOME	600.4			220.5			119.7			748.2			(1,083.2		)	605.6
	NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—			—			—			(5.2		)	—			(5.2		)
	NET INCOME ATTRIBUTABLE TO ENSCO	$	600.4		$	220.5		$	119.7		$	743		$	(1,083.2	)	$	600.4
	ENSCO PLC AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
Year Ended December 31, 2013
(in millions)
	Ensco plc			ENSCO International Incorporated			Pride International, Inc.			Other Non-Guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
NET INCOME	$	1,418.20		$	259.8		$	83.7		$	1,684.10		$	(2,017.9	)	$	1,427.90
OTHER COMPREHENSIVE (LOSS) INCOME, NET
Net change in fair value of derivatives	—			(5.8		)	—			—			—			(5.8		)
Reclassification of net losses on derivative instruments from other comprehensive income into net income	—			2			—			—			—			2
Other	—			—			—			1.9			—			1.9
NET OTHER COMPREHENSIVE (LOSS) INCOME	—			(3.8		)	—			1.9			—			(1.9		)
COMPREHENSIVE INCOME	1,418.20			256			83.7			1,686.00			(2,017.9		)	1,426.00
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—			—			—			(9.7		)	—			(9.7		)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	$	1,418.20		$	256		$	83.7		$	1,676.30		$	(2,017.9	)	$	1,416.30
ENSCO PLC AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
Year Ended December 31, 2012
(in millions)
				ENSCO International Incorporated			Pride International, Inc.			Other Non-Guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
	Ensco plc
NET INCOME	$	1,169.70		$	256.2		$	189.2		$	1,419.60		$	(1,858.0	)	$	1,176.70
OTHER COMPREHENSIVE INCOME (LOSS), NET
Net change in fair value of derivatives	—			6.3			—			2.4			—			8.7
Reclassification of net losses (gains) on derivative instruments from other comprehensive income into net income	—			0.2			—			(.2		)	—			—
Other	—			—			—			2.8			—			2.8
NET OTHER COMPREHENSIVE INCOME	—			6.5			—			5			—			11.5
COMPREHENSIVE INCOME	1,169.70			262.7			189.2			1,424.60			(1,858.0		)	1,188.20
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—			—			—			(7.0		)	—			(7.0		)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	$	1,169.70		$	262.7		$	189.2		$	1,417.60		$	(1,858.0	)	$	1,181.20
ENSCO PLC AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
Year Ended December 31, 2011
(in millions)
				ENSCO International Incorporated			Pride International, Inc.			Other Non-Guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
	Ensco plc
NET INCOME	$	600.4		$	220.5		$	119.7		$	748.2		$	(1,083.2	)	$	605.6
OTHER COMPREHENSIVE (LOSS) INCOME, NET
Net change in fair value of derivatives	—			(4.2		)	—			4.3			—			0.1
Reclassification of net losses (gains) on derivative instruments from other comprehensive income into net income	—			0.2			—			(5.7		)	—			(5.5		)
Other	—			—			—			2.9			—			2.9
NET OTHER COMPREHENSIVE (LOSS) INCOME	—			(4.0		)	—			1.5			—			(2.5		)
COMPREHENSIVE INCOME	600.4			216.5			119.7			749.7			(1,083.2		)	603.1
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—			—			—			(5.2		)	—			(5.2		)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	$	600.4		$	216.5		$	119.7		$	744.5		$	(1,083.2	)	$	597.9
ENSCO PLC AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEETS
31-Dec-13
(in millions)
	Ensco plc			ENSCO			Pride			Other			Consolidating			Total
				International Incorporated			International,			Non-guarantor			Adjustments
							Inc.			Subsidiaries of Ensco
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	46.5		$	0.5		$	4.9		$	113.7		$	—		$	165.6
Accounts receivable, net	—			—			—			855.7			—			855.7
Accounts receivable from	1,235.00			213.8			5.5			4,169.20			(5,623.5		)	—
affiliates
Other	3.2			61.3			—			449.4			—			513.9
Total current assets	1,284.70			275.6			10.4			5,588.00			(5,623.5		)	1,535.20
PROPERTY AND EQUIPMENT, AT COST	2.1			34.3			—			17,462.10			—			17,498.50
Less accumulated depreciation	1.5			26.5			—			3,159.50			—			3,187.50
Property and equipment, net	0.6			7.8			—			14,302.60			—			14,311.00
GOODWILL	—			—			—			3,274.00			—			3,274.00
DUE FROM AFFILIATES	4,876.80			4,236.00			1,898.00			5,069.70			(16,080.5		)	—
INVESTMENTS IN AFFILIATES	13,830.10			4,868.60			4,092.20			—			(22,790.9		)	—
OTHER ASSETS, NET	8.8			60.1			—			283.8			—			352.7
	$	20,001.00		$	9,448.10		$	6,000.60		$	28,518.10		$	(44,494.9	)	$	19,472.90
LIABILITIES AND SHAREHOLDERS' EQUITY
CURRENT LIABILITIES
Accounts payable and accrued	$	31.5		$	9.1		$	34.2		$	925		$	—		$	999.8
liabilities
Accounts payable to affiliates	3,666.10			549.7			—			1,407.70			(5,623.5		)	—
Current maturities of long-term	—			—			—			47.5			—			47.5
debt
Total current liabilities	3,697.60			558.8			34.2			2,380.20			(5,623.5		)	1,047.30
DUE TO AFFILIATES	1,030.80			2,760.40			1,331.10			10,958.20			(16,080.5		)	—
LONG-TERM DEBT	2,473.70			149.1			2,007.80			88.3			—			4,718.90
DEFERRED INCOME TAXES	—			358.3			—			3.8			—			362.1
OTHER LIABILITIES	—			2.3			8.7			534.7			—			545.7
ENSCO SHAREHOLDERS' EQUITY	12,798.90			5,619.20			2,618.80			14,545.60			(22,790.9		)	12,791.60
NONCONTROLLING INTERESTS	—			—			—			7.3			—			7.3
Total equity	12,798.90			5,619.20			2,618.80			14,552.90			(22,790.9		)	12,798.90
	$	20,001.00		$	9,448.10		$	6,000.60		$	28,518.10		$	(44,494.9	)	$	19,472.90
ENSCO PLC AND SUBSIDIARIES
CONDENSED CONSOLIDATING BALANCE SHEETS
31-Dec-12
(in millions)
	Ensco plc			ENSCO			Pride			Other			Consolidating			Total
				International Incorporated			International, Inc.			Non-guarantor			Adjustments
										Subsidiaries of Ensco
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	271.8		$	1.7		$	85		$	128.6		$	—		$	487.1
Accounts receivable, net	—			0.2			—			811.2			—			811.4
Accounts receivable from	1,294.50			226.5			—			2,375.10			(3,896.1		)	—
affiliates
Other	2.8			24.9			—			397.7			—			425.4
Total current assets	1,569.10			253.3			85			3,712.60			(3,896.1		)	1,723.90
PROPERTY AND EQUIPMENT, AT COST	2.1			30.2			—			15,704.80			—			15,737.10
Less accumulated depreciation	1.1			23.5			—			2,566.90			—			2,591.50
Property and equipment, net	1			6.7			—			13,137.90			—			13,145.60
GOODWILL	—			—			—			3,274.00			—			3,274.00
DUE FROM AFFILIATES	3,483.50			3,594.70			1,628.40			4,748.90			(13,455.5		)	—
INVESTMENTS IN AFFILIATES	13,469.30			2,693.80			3,824.80			—			(19,987.9		)	—
OTHER ASSETS, NET	11.3			67.4			—			343.1			—			421.8
	$	18,534.20		$	6,615.90		$	5,538.20		$	25,216.50		$	(37,339.5	)	$	18,565.30
LIABILITIES AND SHAREHOLDERS' EQUITY
CURRENT LIABILITIES
Accounts payable and accrued	$	31		$	28.1		$	34.1		$	849		$	—		$	942.2
liabilities
Accounts payable to affiliates	2,364.80			136.9			—			1,394.40			(3,896.1		)	—
Current maturities of long-term	—			—			—			47.5			—			47.5
debt
Total current liabilities	2,395.80			165			34.1			2,290.90			(3,896.1		)	989.7
DUE TO AFFILIATES	1,816.70			2,054.70			877.5			8,706.60			(13,455.5		)	—
LONG-TERM DEBT	2,469.60			149			2,040.80			139			—			4,798.40
DEFERRED INCOME TAXES	—			335.1			—			16.6			—			351.7
OTHER LIABILITIES	—			—			10.8			562.6			—			573.4
ENSCO SHAREHOLDERS' EQUITY	11,852.10			3,912.10			2,575.00			13,495.10			(19,987.9		)	11,846.40
NONCONTROLLING INTERESTS	—			—			—			5.7			—			5.7
Total equity	11,852.10			3,912.10			2,575.00			13,500.80			(19,987.9		)	11,852.10
	$	18,534.20		$	6,615.90		$	5,538.20		$	25,216.50		$	(37,339.5	)	$	18,565.30
ENSCO PLC AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
Year Ended December 31, 2013
(in millions)
	Ensco plc			ENSCO International Incorporated			Pride International, Inc.			Other Non-guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
OPERATING ACTIVITIES
Net cash (used in) provided by	$	(114.8	)	$	(128.7	)	$	(62.9	)	$	2,193.10		$	—		$	1,886.70
operating activities of continuing operations
INVESTING ACTIVITIES
Additions to property and equipment	—			—			—			(1,768.5		)	—			(1,768.5		)
Purchases of short-term investments	—			—			—			(50.0		)	—			(50.0		)
Maturities of short-term investments	—			—			—			50			—			50
Other	—			(4.1		)	—			10.1			—			6
Net cash used in investing activities of continuing operations	—			(4.1		)	—			(1,758.4		)	—			(1,762.5		)
FINANCING ACTIVITIES
Cash dividends paid	(525.6		)	—			—			—			—			(525.6		)
Reduction of long-term	—			—			—			(47.5		)	—			(47.5		)
borrowings
Proceeds from exercise of share	22.3			—			—			—			—			22.3
options
Debt financing costs	—			(4.6		)	—			—			—			(4.6		)
Advances from (to) affiliates	407.2			136.2			(17.2		)	(526.2		)	—			—
Other	(14.4		)	—			—			(7.3		)	—			(21.7		)
Net cash (used in) provided by	(110.5		)	131.6			(17.2		)	(581.0		)	—			(577.1		)
financing activities
DISCONTINUED OPERATIONS
Operating activities	—			—			—			93.8			—			93.8
Investing activities	—			—			—			37.8			—			37.8
Net cash provided by discontinued operations	—			—			—			131.6			—			131.6
Effect of exchange rate changes on cash and cash equivalents	—			—			—			(.2		)	—			(.2		)
DECREASE IN CASH AND CASH EQUIVALENTS	(225.3		)	(1.2		)	(80.1		)	(14.9		)	—			(321.5		)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	271.8			1.7			85			128.6			—			487.1
CASH AND CASH EQUIVALENTS, END OF YEAR	$	46.5		$	0.5		$	4.9		$	113.7		$	—		$	165.6
ENSCO PLC AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
Year Ended December 31, 2012
(in millions)
	Ensco plc			ENSCO International Incorporated			Pride International, Inc.			Other Non-guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
OPERATING ACTIVITIES
Net cash (used in) provided by	$	(71.6	)	$	(38.2	)	$	(21.6	)	$	2,205.50		$	—		$	2,074.10
operating activities of continuing operations
INVESTING ACTIVITIES
Additions to property and	—			—			—			(1,715.0		)	—			(1,715.0		)
equipment
Purchases of short-term investments	—			—			—			(90.0		)	—			(90.0		)
Maturities of short-term investments	—			—			—			44.5			—			44.5
Other	(.3		)	0.4			—			3.1			—			3.2
Net cash (used in) provided	(.3		)	0.4			—			(1,757.4		)	—			(1,757.3		)
by investing activities of
continuing operations
FINANCING ACTIVITIES
Cash dividends paid	(348.1		)	—			—			—			—			(348.1		)
Commercial paper borrowings,	(125.0		)	—			—			—			—			(125.0		)
net
Equity issuance reimbursement	66.7			—			—			—			—			66.7
Reduction of long-term	—			—			—			(47.5		)	—			(47.5		)
borrowings
Proceeds from exercise of share	23.9			11.9			—			—			—			35.8
options
Advances from (to) affiliates	501.2			27.6			84			(612.8		)	—			—
Other	(11.6		)	—			—			(5.8		)	—			(17.4		)
Net cash provided by (used in)	107.1			39.5			84			(666.1		)	—			(435.5		)
financing activities
DISCONTINUED OPERATIONS
Operating activities	—			—			—			113			—			113
Investing activities	—			—			—			60.1			—			60.1
Net cash provided by discontinued operations	—			—			—			173.1			—			173.1
Effect of exchange rate changes	—			—			—			2			—			2
on cash and cash equivalents
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	35.2			1.7			62.4			(42.9		)	—			56.4
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	236.6			—			22.6			171.5			—			430.7
CASH AND CASH EQUIVALENTS, END OF YEAR	$	271.8		$	1.7		$	85		$	128.6		$	—		$	487.1
ENSCO PLC AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
Year Ended December 31, 2011
(in millions)
	Ensco plc			ENSCO International Incorporated			Pride International, Inc.			Other Non-guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
OPERATING ACTIVITIES
Net cash provided by (used in)	$	2		$	(2.6	)	$	(59.9	)	$	817.9		$	—		$	757.4
operating activities of continuing operations
INVESTING ACTIVITIES
Acquisition of Pride International, Inc.,	—			—			92.9			(2,748.9		)	—			(2,656.0		)
net of cash acquired
Additions to property and equipment	—			—			—			(645.7		)	—			(645.7		)
Purchases of short-term investments	—			—			—			(4.5		)	—			(4.5		)
Other	—			(6.1		)	—			11.4			—			5.3
Net cash (used in) provided	—			(6.1		)	92.9			(3,387.7		)	—			(3,300.9		)
by investing activities of
continuing operations
FINANCING ACTIVITIES
Proceeds from issuance of senior	2,462.80			—			—			—			—			2,462.80
notes
Cash dividends paid	(292.3		)	—			—			—			—			(292.3		)
Reduction of long-term borrowings	—			—			(181.0		)	(32.3		)	—			(213.3		)
Commercial paper borrowings,	125			—			—			—			—			125
net
Equity issuance cost	(70.5		)	—			—			—			—			(70.5		)
Proceeds from exercise of share options	—			39.9												39.9
Debt financing costs	(27.1		)	(4.7		)	—			—			—			(31.8		)
Advances (to) from affiliates	(1,956.1		)	(34.5		)	170.6			1,820.00			—			—
Other	(10.6		)	—			—			(5.1		)	—			(15.7		)
Net cash provided by (used in) financing activities	231.2			0.7			(10.4		)	1,782.60			—			2,004.10
DISCONTINUED OPERATIONS
Operating activities	—			(11.1		)	—			(14.1		)	—			(25.2		)
Investing activities	—			—			—			(54.6		)	—			(54.6		)
Net cash used in discontinued operations	—			(11.1		)	—			(68.7		)	—			(79.8		)
Effect of exchange rate changes on cash and cash equivalents	—			—			—			(.8		)	—			(.8		)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	233.2			(19.1		)	22.6			(856.7		)	—			(620.0		)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	3.4			19.1			—			1,028.20			—			1,050.70
CASH AND CASH EQUIVALENTS, END	$	236.6		$	—		$	22.6		$	171.5		$	—		$	430.7
OF YEAR

Unaudited_Quarterly_Financial_

Unaudited Quarterly Financial Data	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Data [Abstract]	'
Unaudited Quarterly Financial Data	'
	UNAUDITED QUARTERLY FINANCIAL DATA
	The following tables summarize our unaudited quarterly consolidated income statement data for the years ended December 31, 2013 and 2012 (in millions, except per share amounts):
	2013	First			Second			Third			Fourth			Year
		Quarter			Quarter			Quarter			Quarter
	Operating revenues	$	1,040.30		$	1,130.30		$	1,162.20		$	1,187.10		$	4,519.90
	Operating expenses
	Contract drilling (exclusive of depreciation)	479.8			527.2			534.3			538.8			2,080.10
	Depreciation	127.9			132			132.6			135.7			528.2
	General and administrative	37.8			36.4			37.4			35.2			146.8
	Operating income	394.8			434.7			457.9			477.4			1,764.80
	Other expense, net	(29.8		)	(39.8		)	(1.6		)	(28.9		)	(100.1		)
	Income from continuing operations before income taxes	365			394.9			456.3			448.5			1,664.70
	Provision for income taxes	50.8			48.5			65.4			48			212.7
	Income from continuing operations	314.2			346.4			390.9			400.5			1,452.00
	Loss from discontinued operations, net	5.7			16.2			(9.5		)	(36.5		)	(24.1		)
	Net income	319.9			362.6			381.4			364			1,427.90
	Net income attributable to noncontrolling interests	(2.8		)	(1.7		)	(2.6		)	(2.6		)	(9.7		)
	Net income attributable to Ensco	$	317.1		$	360.9		$	378.8		$	361.4		$	1,418.20
	Earnings (loss) per share – basic
	Continuing operations	$	1.34		$	1.48		$	1.66		$	1.71		$	6.19
	Discontinued operations	0.02			0.07			(0.04		)	(0.16		)	(0.11		)
		$	1.36		$	1.55		$	1.62		$	1.55		$	6.08
	Earnings (loss) per share – diluted
	Continuing operations	$	1.34		$	1.48		$	1.66		$	1.7		$	6.18
	Discontinued operations	0.02			0.07			(0.04		)	(0.16		)	(0.11		)
		$	1.36		$	1.55		$	1.62		$	1.54		$	6.07
	2012	First			Second			Third			Fourth			Year
		Quarter			Quarter			Quarter			Quarter
	Operating revenues	$	916.5		$	965.7		$	1,013.90		$	973.1		$	3,869.20
	Operating expenses
	Contract drilling (exclusive of depreciation)	439.9			423.4			434.1			450.5			1,747.90
	Depreciation	116.4			115.5			121.2			123			476.1
	General and administrative	38.2			35.5			40.2			35			148.9
	Operating income	322			391.3			418.4			364.6			1,496.30
	Other expense, net	(26.7		)	(24.7		)	(25.5		)	(21.7		)	(98.6		)
	Income from continuing operations before income taxes	295.3			366.6			392.9			342.9			1,397.70
	Provision for income taxes	32.8			40.4			44.3			120.6			238.1
	Income from continuing operations	262.5			326.2			348.6			222.3			1,159.60
	(Loss) income from discontinued operations, net	4.9			16.5			(3.2		)	(1.1		)	17.1
	Net income	267.4			342.7			345.4			221.2			1,176.70
	Net income attributable to noncontrolling interests	(2.0		)	(1.4		)	(1.9		)	(1.7		)	(7.0		)
	Net income attributable to Ensco	$	265.4		$	341.3		$	343.5		$	219.5		$	1,169.70
	Earnings (loss) per share – basic
	Continuing operations	$	1.13		$	1.4		$	1.49		$	0.95		$	4.97
	Discontinued operations	0.02			0.07			(0.01		)	(0.01		)	0.08
		$	1.15		$	1.47		$	1.48		$	0.94		$	5.05
	Earnings (loss) per share – diluted
	Continuing operations	$	1.13		$	1.4		$	1.49		$	0.95		$	4.97
	Discontinued operations	0.02			0.07			(0.01		)	(0.01		)	0.07
		$	1.15		$	1.47		$	1.48		$	0.94		$	5.04

Subsequent_Events_Subsequent_E

Subsequent Events Subsequent Events	12 Months Ended
	Dec. 31, 2013
Subsequent Events [Abstract]	'
Subsequent Events [Text Block]	'
	SUBSEQUENT EVENTS
	In January 2014, we closed on the sale of ENSCO 69 and Pride Wisconsin for $32.2 million. The proceeds were received in December 2013 and included in net cash used in investing activities of discontinued operations in our consolidated statement of cash flows for the year ended December 31, 2013 and accrued liabilities and other on our consolidated balance sheet as of December 31, 2013. We classified the rigs as held for sale during the fourth quarter of 2013 and included the $8.6 million aggregate net book value in other current assets on our consolidated balance sheet as of December 31, 2013. The gain on sale was recognized during the first quarter of 2014.
	In April 2014, we sold ENSCO 85 for net proceeds of $64.4 million. The gain on sale was recognized during the second quarter of 2014.
	During recent periods, a reduction in demand by operators combined with an oversupply of rigs has negatively impacted the floater market. The supply and demand imbalance has significantly challenged drilling contractors to contract older, less capable floaters.
	During the second quarter of 2014, demand for floaters deteriorated further as a result of the continued reduction in capital spending by operators and recently announced delays in operators’ drilling programs. The further reduction in demand, when combined with the increasing supply from newbuild floater deliveries, has led to a very competitive market. In response to the adverse change in the current and anticipated floaters business climate, management evaluated our older, less capable floaters during the three-month period ended June 30, 2014 and committed to a plan to sell five rigs. These rigs were written down to fair value, less costs to sell, and classified as "held for sale" on our June 30, 2014 condensed consolidated balance sheet. We recorded a pre-tax, non-cash loss on impairment totaling $546.4 million during the three-month period ended June 30, 2014.
	As a result of the adverse change in the floater business climate observed during the second quarter of 2014, management's commitment to a plan to sell five floaters during the second quarter of 2014 and the impairment charge incurred on the "held for sale" floaters, management concluded that a triggering event had occurred during the second quarter of 2014 and performed an asset impairment analysis on our remaining older, less capable floaters. Based on the analysis performed, we recorded an additional non-cash loss on impairment with respect to four other floaters totaling $991.5 million during the three-month period ended June 30, 2014.

Description_Of_The_Business_An1

Description Of The Business And Summary Of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2013
Description Of The Business And Summary Of Significant Accounting Policies [Abstract]	'
Business	'
	Business
	We are one of the leading providers of offshore contract drilling services to the international oil and gas industry. We own an offshore drilling rig fleet of 74 rigs, including six rigs under construction, spanning most of the strategic, high-growth markets around the globe. Our rig fleet includes ten drillships, 13 dynamically positioned semisubmersible rigs, six moored semisubmersible rigs and 45 jackup rigs.  Our fleet is the world's second largest amongst competitive rigs, our ultra-deepwater fleet is the newest in the industry, and our premium jackup fleet is the largest of any offshore drilling company.
	Our customers include most of the leading national and international oil companies, in addition to many independent operators. We are among the most geographically diverse offshore drilling companies, with current operations and drilling contracts spanning approximately 20 countries on six continents in nearly every major offshore basin around the world. The markets in which we operate include the U.S. Gulf of Mexico, Mexico, Brazil, the Mediterranean, the North Sea, the Middle East, West Africa, Australia and Southeast Asia.
	We provide drilling services on a "day rate" contract basis. Under day rate contracts, we provide a drilling rig and rig crews and receive a fixed amount per day for drilling a well. Our customers bear substantially all of the ancillary costs of constructing the well and supporting drilling operations, as well as the economic risk relative to the success of the well. In addition, our customers may pay all or a portion of the cost of moving our equipment and personnel to and from the well site. We do not provide "turnkey" or other risk-based drilling services.
Redomestication	'
	Redomestication
	During 2009, we completed a reorganization of the corporate structure of the group of companies controlled by our predecessor, ENSCO International Incorporated ("Ensco Delaware"), pursuant to which an indirect, wholly-owned subsidiary merged with Ensco Delaware, and Ensco plc became our publicly-held parent company incorporated under English law (the "redomestication").
	The redomestication was accounted for as an internal reorganization of entities under common control and, therefore, Ensco Delaware's assets and liabilities were accounted for at their historical cost basis and not revalued in the transaction. We remain subject to the U.S. Securities and Exchange Commission (the "SEC") reporting requirements, the mandates of the Sarbanes-Oxley Act of 2002, as amended, and the applicable corporate governance rules of the New York Stock Exchange ("NYSE"), and we will continue to report our consolidated financial results in U.S. dollars and in accordance with U.S. generally accepted accounting principles ("GAAP"). We also must comply with additional reporting requirements of English law.
Basis Of Presentation-U.K. Companies Act 2006 Section 435 Statement	'
	Basis of Presentation—U.K. Companies Act 2006 Section 435 Statement
	The accompanying consolidated financial statements have been prepared in accordance with GAAP, which the directors consider to be the most meaningful presentation of our results of operations and financial position.  The accompanying consolidated financial statements do not constitute statutory accounts required by the U.K. Companies Act 2006, which for the year ended December 31, 2013 will be prepared in accordance with generally accepted accounting principles in the U.K. and delivered to the Registrar of Companies in the U.K. following the annual general meeting of shareholders.  The U.K. statutory accounts are expected to include an unqualified auditor’s report, which is not expected to contain any references to matters on which the auditors drew attention by way of emphasis without qualifying the report or any statements under Sections 498(2) or 498(3) of the U.K. Companies Act 2006.
Principles Of Consolidation	'
	Principles of Consolidation
	The accompanying consolidated financial statements include the accounts of Ensco plc and its majority-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated. Certain previously reported amounts have been reclassified to conform to the current year presentation.
Pervasiveness Of Estimates	'
	Pervasiveness of Estimates
	The preparation of financial statements in conformity with GAAP requires management to make certain estimates, judgments and assumptions that affect the reported amounts of assets and liabilities, the related revenues and expenses and disclosures of gain and loss contingencies as of the date of the financial statements. Actual results could differ from those estimates.
Foreign Currency Remeasurement And Translation	'
	Foreign Currency Remeasurement and Translation
	Our functional currency is the U.S. dollar. As is customary in the oil and gas industry, a majority of our revenues and expenses are denominated in U.S. dollars; however, a portion of the revenues earned and expenses incurred by certain of our subsidiaries are denominated in currencies other than the U.S. dollar ("foreign currencies"). These transactions are remeasured in U.S. dollars based on a combination of both current and historical exchange rates. Most transaction gains and losses, including certain gains and losses on our derivative instruments, are included in other, net, in our consolidated statement of income.  Certain gains and losses from the translation of foreign currency balances of our non-U.S. dollar functional currency subsidiaries are included in accumulated other comprehensive income on our consolidated balance sheet.  We incurred net foreign currency exchange gains of $6.4 million, net foreign currency exchange losses of $3.5 million and net foreign currency exchange gains of $16.9 million for the years ended December 31, 2013, 2012 and 2011, respectively.
Cash Equivalents And Short-Term Investments	'
	Cash Equivalents and Short-Term Investments
	Highly liquid investments with maturities of three months or less at the date of purchase are considered cash equivalents. Highly liquid investments with maturities of greater than three months but less than one year at the date of purchase are classified as short-term investments.
	Short-term investments, consisting of time deposits with initial maturities in excess of three months but less than one year, were included in other current assets on our consolidated balance sheets and totaled $50.0 million as of December 31, 2013 and 2012. Cash flows from purchases and maturities of short-term investments were classified as investing activities in our consolidated statements of cash flows for the years ended December 31, 2013, 2012 and 2011.
Property And Equipment	'
	Property and Equipment
	All costs incurred in connection with the acquisition, construction, major enhancement and improvement of assets are capitalized, including allocations of interest incurred during periods that our drilling rigs are under construction or undergoing major enhancements and improvements. Repair and maintenance costs are charged to contract drilling expense in the period in which they occur. Upon sale or retirement of assets, the related cost and accumulated depreciation are removed from the balance sheet, and the resulting gain or loss is included in contract drilling expense, unless reclassified to discontinued operations.
	Our property and equipment is depreciated on a straight-line basis, after allowing for salvage values, over the estimated useful lives of our assets. Drilling rigs and related equipment are depreciated over estimated useful lives ranging from four to 35 years.  Buildings and improvements are depreciated over estimated useful lives ranging from two to 30 years. Other equipment, including computer and communications hardware and software costs, is depreciated over estimated useful lives ranging from two to six years.
	We evaluate the carrying value of our property and equipment for impairment when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable. For property and equipment used in our operations, recoverability generally is determined by comparing the carrying value of an asset to the expected undiscounted future cash flows of the asset. If the carrying value of an asset is not recoverable, the amount of impairment loss is measured as the difference between the carrying value of the asset and its estimated fair value. Property and equipment held for sale is recorded at the lower of net book value or net realizable value.
	If the global economy were to deteriorate and/or the offshore drilling industry were to incur a significant prolonged downturn, it is reasonably possible that impairment charges may occur with respect to specific individual rigs, groups of rigs, such as a specific type of drilling rig, or rigs in a certain geographic location.
Goodwill	'
	Goodwill
	Our business consists of three operating segments: (1) Floaters, which includes our drillships and semisubmersible rigs, (2) Jackups and (3) Other, which consists of management services on rigs owned by third-parties. Our two reportable segments, Floaters and Jackups, provide one service, contract drilling.
	We test goodwill for impairment on an annual basis as of December 31 of each year or when events or changes in circumstances indicate that a potential impairment exists.  When testing goodwill for impairment, we perform a qualitative assessment to determine whether it is more-likely-than-not that the fair value of a reporting unit is less than its carrying amount.
	If we conclude that the fair value of one or both of our reporting units has more-likely-than-not declined below its carrying amount after qualitatively assessing existing facts and circumstances, we perform a quantitative assessment whereby we estimate the fair value of each reporting unit.  In most instances, our calculation of the fair value of our reporting units is based on estimates of future discounted cash flows to be generated by our drilling rigs in the reporting unit.
	Based on a qualitative assessment performed as of December 31, 2013, we concluded it was more-likely-than-not that the fair value of our reporting units exceeded their carrying amount, and there was no impairment of goodwill. However, if the market value of our shares declines for a prolonged period, and if management's judgments and assumptions regarding future industry conditions and operations diminish, it is reasonably possible that our expectations of future cash flows may decline and ultimately result in goodwill impairment for our Floaters reporting unit. See "Note 9 - Goodwill and Other Intangible Assets and Liabilities" for additional information on our goodwill.
Operating Revenues And Expenses	'
	Operating Revenues and Expenses
	Substantially all of our drilling contracts ("contracts") are performed on a day rate basis, and the terms of such contracts are typically for a specific period of time or the period of time required to complete a specific task, such as drill a well. Contract revenues and expenses are recognized on a per day basis, as the work is performed. Day rate revenues are typically earned, and contract drilling expense is typically incurred, on a uniform basis over the terms of our contracts.
	In connection with some contracts, we receive lump-sum fees or similar compensation for the mobilization of equipment and personnel prior to the commencement of drilling services or the demobilization of equipment and personnel upon contract completion. Fees received for the mobilization or demobilization of equipment and personnel are included in operating revenues. The costs incurred in connection with the mobilization and demobilization of equipment and personnel are included in contract drilling expense.
	Mobilization fees received and costs incurred prior to commencement of drilling operations are deferred and recognized on a straight-line basis over the period that the related drilling services are performed. Demobilization fees and related costs are recognized as incurred upon contract completion. Costs associated with the mobilization of equipment and personnel to more promising market areas without contracts are expensed as incurred.
	Deferred mobilization costs were included in other current assets and other assets, net, on our consolidated balance sheets and totaled $66.6 million and $54.5 million as of December 31, 2013 and 2012, respectively. Deferred mobilization revenue was included in accrued liabilities and other, and other liabilities on our consolidated balance sheets and totaled $76.8 million and $52.6 million as of December 31, 2013 and 2012, respectively.
	In connection with some contracts, we receive up-front lump-sum fees or similar compensation for capital improvements to our drilling rigs. Such compensation is deferred and recognized as revenue over the period that the related drilling services are performed. The cost of such capital improvements is capitalized and depreciated over the useful life of the asset. Deferred revenue associated with capital improvements was included in accrued liabilities and other, and other liabilities on our consolidated balance sheets and totaled $273.6 million and $301.9 million as of December 31, 2013 and 2012, respectively.
	We must obtain certifications from various regulatory bodies in order to operate our drilling rigs and must maintain such certifications through periodic inspections and surveys. The costs incurred in connection with maintaining such certifications, including inspections, tests, surveys and drydock, as well as remedial structural work and other compliance costs, are deferred and amortized over the corresponding certification periods. Deferred regulatory certification and compliance costs were included in other current assets and other assets, net, on our consolidated balance sheets and totaled $18.3 million and $14.4 million as of December 31, 2013 and 2012, respectively.
	In certain countries in which we operate, taxes such as sales, use, value-added, gross receipts and excise may be assessed by the local government on our revenues. We generally record our tax-assessed revenue transactions on a net basis in our consolidated statement of income.
Derivative Instruments	'
	Derivative Instruments
	We use derivatives to reduce our exposure to various market risks, primarily foreign currency exchange rate risk. See "Note 6 - Derivative Instruments" for additional information on how and why we use derivatives.
	All derivatives are recorded on our consolidated balance sheet at fair value. Derivatives subject to legally enforceable master netting agreements are not offset on our consolidated balance sheet. Accounting for the gains and losses resulting from changes in the fair value of derivatives depends on the use of the derivative and whether it qualifies for hedge accounting. Derivatives qualify for hedge accounting when they are formally designated as hedges and are effective in reducing the risk exposure that they are designated to hedge. Our assessment of hedge effectiveness is formally documented at hedge inception, and we review hedge effectiveness and measure any ineffectiveness throughout the designated hedge period on at least a quarterly basis.
	Changes in the fair value of derivatives that are designated as hedges of the variability in expected future cash flows associated with existing recognized assets or liabilities or forecasted transactions ("cash flow hedges") are recorded in accumulated other comprehensive income ("AOCI").  Amounts recorded in AOCI associated with cash flow hedges are subsequently reclassified into contract drilling, depreciation or interest expense as earnings are affected by the underlying hedged forecasted transactions.
	Gains and losses on a cash flow hedge, or a portion of a cash flow hedge, that no longer qualifies as effective due to an unanticipated change in the forecasted transaction are recognized currently in earnings and included in other, net, in our consolidated statement of income based on the change in the fair value of the derivative. When a forecasted transaction is no longer probable of occurring, gains and losses on the derivative previously recorded in AOCI are reclassified currently into earnings and included in other, net, in our consolidated statement of income.
	We occasionally enter into derivatives that hedge the fair value of recognized assets or liabilities, but do not designate such derivatives as hedges or the derivatives otherwise do not qualify for hedge accounting. In these situations, there generally is a natural hedging relationship where changes in the fair value of the derivatives offset changes in the fair value of the underlying hedged items. Changes in the fair value of these derivatives are recognized currently in earnings in other, net, in our consolidated statement of income.
	Derivatives with asset fair values are reported in other current assets or other assets, net, on our consolidated balance sheet depending on maturity date. Derivatives with liability fair values are reported in accrued liabilities and other or other liabilities on our consolidated balance sheet depending on maturity date.
Income Taxes	'
	Income Taxes
	We conduct operations and earn income in numerous countries. Current income taxes are recognized for the amount of taxes payable or refundable based on the laws and income tax rates in the taxing jurisdictions in which operations are conducted and income is earned.
	Deferred tax assets and liabilities are recognized for the anticipated future tax effects of temporary differences between the financial statement basis and the tax basis of our assets and liabilities using the enacted tax rates in effect at year-end. A valuation allowance for deferred tax assets is recorded when it is more-likely-than-not that the benefit from the deferred tax asset will not be realized. We do not offset deferred tax assets and deferred tax liabilities attributable to different tax paying jurisdictions.
	We operate in certain jurisdictions where tax laws relating to the offshore drilling industry are not well developed and change frequently. Furthermore, we may enter into transactions with affiliates or employ other tax planning strategies that generally are subject to complex tax regulations. As a result of the foregoing, the tax liabilities and assets we recognize in our financial statements may differ from the tax positions taken, or expected to be taken, in our tax returns. Our tax positions are evaluated for recognition using a more-likely-than-not threshold, and those tax positions requiring recognition are measured as the largest amount of tax benefit that is greater than 50% likely of being realized upon effective settlement with a taxing authority that has full knowledge of all relevant information. Interest and penalties relating to income taxes are included in current income tax expense in our consolidated statement of income.
	Our drilling rigs frequently move from one taxing jurisdiction to another based on where they are contracted to perform drilling services. The movement of drilling rigs among taxing jurisdictions may involve a transfer of drilling rig ownership among our subsidiaries (“intercompany rig sale”). The pre-tax profit resulting from an intercompany rig sale is eliminated from our consolidated financial statements and the carrying value of a rig sold in an intercompany transaction remains at historical net depreciated cost prior to the transaction. Our consolidated financial statements do not reflect the asset disposition transaction of the selling subsidiary or the asset acquisition transaction of the acquiring subsidiary. Income taxes resulting from an intercompany rig sale, as well as the tax effect of any reversing temporary differences resulting from the sale, are deferred and amortized on a straight-line basis over the remaining useful life of the rig.
	In some instances, we may determine that certain temporary differences will not result in a taxable or deductible amount in future years; as it is more-likely-than-not we will commence operations and depart from a given taxing jurisdiction without such temporary differences being recovered or settled. Under these circumstances, no future tax consequences are expected and no deferred taxes are recognized in connection with such operations. We evaluate these determinations on a periodic basis and, in the event our expectations relative to future tax consequences change, the applicable deferred taxes are recognized or derecognized.
	We do not provide deferred taxes on the undistributed earnings of certain subsidiaries because our policy and intention is to reinvest such earnings indefinitely. See "Note 10 - Income Taxes" for additional information on our deferred taxes, unrecognized tax benefits, intercompany transfers of drilling rigs and undistributed earnings.
Share-Based Compensation	'
	Share-Based Compensation
	We sponsor share-based compensation plans that provide equity compensation to our key employees, officers and non-employee directors. Share-based compensation cost is measured at fair value on the date of grant and recognized on a straight-line basis over the requisite service period (usually the vesting period). The amount of compensation cost recognized in our consolidated statement of income is based on the awards ultimately expected to vest and, therefore, reduced for estimated forfeitures. All changes in estimated forfeitures are based on historical experience and are recognized as a cumulative adjustment to compensation cost in the period in which they occur. See "Note 8 - Benefit Plans" for additional information on our share-based compensation.
Fair Value Measurements	'
	Fair Value Measurements
	We measure certain of our assets and liabilities based on a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy assigns the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities ("Level 1") and the lowest priority to unobservable inputs ("Level 3").  Level 2 measurements represent inputs that are observable for similar assets or liabilities, either directly or indirectly, other than quoted prices included within Level 1.  See "Note 3 - Fair Value Measurements" for additional information on the fair value measurement of certain of our assets and liabilities.
Earnings Per Share	'
	Earnings Per Share
	We compute basic and diluted earnings per share ("EPS") in accordance with the two-class method. Net income attributable to Ensco used in our computations of basic and diluted EPS is adjusted to exclude net income allocated to non-vested shares granted to our employees and non-employee directors. Weighted-average shares outstanding used in our computation of diluted EPS is calculated using the treasury stock method and excludes non-vested shares.
	The following table is a reconciliation of net income attributable to Ensco shares used in our basic and diluted EPS computations for each of the years in the three-year period ended December 31, 2013 (in millions):
		2013				2012			2011
	Net income attributable to Ensco		$1,418.20				$1,169.70			$600.40
	Net income allocated to non-vested share awards	(15.1		)		(12.3		)	(6.9		)
	Net income attributable to Ensco shares		$1,403.10				$1,157.40			$593.50
	The following table is a reconciliation of the weighted-average shares used in our basic and diluted earnings per share computations for each of the years in the three-year period ended December 31, 2013 (in millions):
		2013			2012			2011
	Weighted-average shares - basic	230.9			229.4			192.2
	Potentially dilutive shares	0.2			0.3			0.4
	Weighted-average shares - diluted	231.1			229.7			192.6
	Antidilutive share options totaling 300,000 for the year ended December 31, 2013 and 400,000 for the years ended December 31, 2012 and 2011 were excluded from the computation of diluted EPS.
Noncontrolling Interests	'
	Noncontrolling Interests
	Third parties hold a noncontrolling ownership interest in certain of our non-U.S. subsidiaries. Noncontrolling interests are classified as equity on our consolidated balance sheet and net income attributable to noncontrolling interests is presented separately in our consolidated statement of income.
	Income from continuing operations attributable to Ensco for each of the years in the three-year period ended December 31, 2013 was as follows (in millions):
		2013				2012			2011
	Income from continuing operations	$	1,452.00			$	1,159.60		$	627.4
	Income from continuing operations attributable to noncontrolling interests	(8.9		)		(7.0		)	(5.2		)
	Income from continuing operations attributable to Ensco	$	1,443.10			$	1,152.60		$	622.2
	(Loss) income from discontinued operations attributable to Ensco for each of the years in the three-year period ended December 31, 2013 was as follows (in millions):
		2013				2012			2011
	(Loss) income from discontinued operations	$	(24.1	)		$	17.1		$	(21.8	)
	Income from discontinued operations attributable to noncontrolling interests	(.8		)		—			—
	(Loss) income from discontinued operations attributable to Ensco	$	(24.9	)		$	17.1		$	(21.8	)

Description_Of_The_Business_An2

Description Of The Business And Summary Of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2013
Description Of The Business And Summary Of Significant Accounting Policies [Abstract]	'
Reconciliation Of Net Income Attributable To Ensco Shares Used In Basic And Diluted EPS Computations	'
	The following table is a reconciliation of net income attributable to Ensco shares used in our basic and diluted EPS computations for each of the years in the three-year period ended December 31, 2013 (in millions):
		2013				2012			2011
	Net income attributable to Ensco		$1,418.20				$1,169.70			$600.40
	Net income allocated to non-vested share awards	(15.1		)		(12.3		)	(6.9		)
	Net income attributable to Ensco shares		$1,403.10				$1,157.40			$593.50
Reconciliation Of The Weighted-Average Shares Used In Basic And Diluted Earnings Per Share Computations	'
	The following table is a reconciliation of the weighted-average shares used in our basic and diluted earnings per share computations for each of the years in the three-year period ended December 31, 2013 (in millions):
		2013			2012			2011
	Weighted-average shares - basic	230.9			229.4			192.2
	Potentially dilutive shares	0.2			0.3			0.4
	Weighted-average shares - diluted	231.1			229.7			192.6
Schedule Of Income From Continuing Operations Attributable To Ensco	'
	Income from continuing operations attributable to Ensco for each of the years in the three-year period ended December 31, 2013 was as follows (in millions):
		2013				2012			2011
	Income from continuing operations	$	1,452.00			$	1,159.60		$	627.4
	Income from continuing operations attributable to noncontrolling interests	(8.9		)		(7.0		)	(5.2		)
	Income from continuing operations attributable to Ensco	$	1,443.10			$	1,152.60		$	622.2

Acquisition_Of_Pride_Internati1

Acquisition Of Pride International, Inc. (Tables)	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
Business Acquisition, Pro Forma Information	'
	(In millions, except per share amounts)
		2011*
	Revenues	$	3,094.60
	Net income	604.8
	Earnings per share - basic	2.61
	Earnings per share - diluted	2.6
	*	Supplemental pro forma earnings were adjusted to exclude an aggregate $157.6 million of merger-related costs incurred by Ensco and Pride during 2011.

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Schedule Of Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis	'
	The following fair value hierarchy table categorizes information regarding our net financial assets measured at fair value on a recurring basis as of December 31, 2013 and 2012 (in millions):
		Quoted Prices in			Significant			Significant			Total
		Active Markets			Other			Unobservable
		for			Observable			Inputs
		Identical Assets			Inputs			(Level 3)
		(Level 1)			(Level 2)
	As of December 31, 2013
	Supplemental executive retirement plan assets	$	37.7		$	—		$	—		$	37.7
	Derivatives, net	—			1.8			—			1.8
	Total financial assets	$	37.7		$	1.8		$	—		$	39.5
	As of December 31, 2012
	Supplemental executive retirement plan assets	$	29.8		$	—		$	—		$	29.8
	Derivatives, net	—			5.2			—			5.2
	Total financial assets	$	29.8		$	5.2		$	—		$	35
Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments	'
	The carrying values and estimated fair values of our debt instruments as of December 31, 2013 and 2012 were as follows (in millions):
			31-Dec-13						31-Dec-12
			Carrying			Estimated			Carrying			Estimated
			Value			Fair			Value			Fair
						Value						Value
	4.70% Senior notes due 2021		$	1,477.20		$	1,596.90		$	1,474.70		$	1,715.60
	6.875% Senior notes due 2020		1,024.80			1,086.70			1,040.60			1,138.30
	3.25% Senior notes due 2016		996.5			1,045.80			995.1			1,068.90
	8.50% Senior notes due 2019		600.5			635.8			616.4			661.7
	7.875% Senior notes due 2040		382.6			410.5			383.8			423.9
	7.20% Debentures due 2027		149.1			178.6			149			193.2
	4.33% MARAD bonds, including current maturities, due 2016		78.9			79.7			112.3			121.6
	6.36% MARAD bonds, including current maturities, due 2015		25.3			27.1			38			48.7
	4.65% MARAD bonds, including current maturities, due 2020		31.5			35.2			36			43.9
	Total		$	4,766.40		$	5,096.30		$	4,845.90		$	5,415.80

Property_And_Equipment_Tables

Property And Equipment (Tables)	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Schedule Of Property And Equipment	'
	Property and equipment as of December 31, 2013 and 2012 consisted of the following (in millions):
		2013		2012
	Drilling rigs and equipment	$	15,839.00	$	13,499.40
	Other	101		89.1
	Work in progress	1,558.50		2,148.60
		$	17,498.50	$	15,737.10

Debt_Tables

Debt (Tables)	12 Months Ended
	Dec. 31, 2013
Debt Instruments [Abstract]	'
Schedule Of Long-Term Debt Instruments	'
	The carrying value of long-term debt as of December 31, 2013 and 2012 consisted of the following (in millions):
		2013			2012
	4.70% Senior notes due 2021	$	1,477.20		$	1,474.70
	6.875% Senior notes due 2020	1,024.80			1,040.60
	3.25% Senior notes due 2016	996.5			995.1
	8.50% Senior notes due 2019	600.5			616.4
	7.875% Senior notes due 2040	382.6			383.8
	7.20% Debentures due 2027	149.1			149
	4.33% MARAD bonds due 2016	78.9			112.3
	6.36% MARAD bonds due 2015	25.3			38
	4.65% MARAD bonds due 2020	31.5			36
	Total debt	4,766.40			4,845.90
	Less current maturities	(47.5		)	(47.5		)
	Total long-term debt	$	4,718.90		$	4,798.40
Aggregate Maturities Of Long-Term Debt	'
	The aggregate maturities of our debt, excluding net unamortized premiums of $283.7 million, as of December 31, 2013 were as follows (in millions):
	2014	$	47.5
	2015	47.5
	2016	1,019.70
	2017	4.5
	2018	4.5
	Thereafter	3,359.00
	Total	$	4,482.70

Derivative_Instruments_Tables

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Schedule Of Derivatives At Fair Value	'
	Derivatives recorded at fair value on our consolidated balance sheets as of December 31, 2013 and 2012 consisted of the following (in millions):
		Derivative Assets						Derivative Liabilities
		2013				2012		2013		2012
	Derivatives Designated as Hedging Instruments
	Foreign currency forward contracts - current(1)	$	9.1			$	5	$	9.8	$	0.3
	Foreign currency forward contracts - non-current(2)	1.2				0.5		0.6		—
		10.3				5.5		10.4		0.3
	Derivatives not Designated as Hedging Instruments
	Foreign currency forward contracts - current(1)	2.5				0.2		0.6		0.2
		2.5				0.2		0.6		0.2
	Total	$	12.8			$	5.7	$	11	$	0.5
	(1)	Derivative assets and liabilities that have maturity dates equal to or less than 12 months from the respective balance sheet dates were included in other current assets and accrued liabilities and other, respectively, on our consolidated balance sheets.
	(2)	Derivative assets and liabilities that have maturity dates greater than 12 months from the respective balance sheet dates were included in other assets, net, and other liabilities, respectively, on our consolidated balance sheets.
Gains And Losses On Derivatives Designated As Cash Flow Hedges	'
	Gains and losses, net of tax, on derivatives designated as cash flow hedges included in our consolidated statements of income and comprehensive income for each of the years in the three-year period ended December 31, 2013 were as follows (in millions):
		(Loss) Gain Recognized in Other Comprehensive								(Loss) Gain									(Loss) Gain Recognized
		Income ("OCI")								Reclassified from									in Income on
		on Derivatives								AOCI into Income									Derivatives (Ineffective
		(Effective Portion)								(Effective Portion)(1)									Portion and Amount
																			Excluded from
																			Effectiveness Testing)(2)
		2013				2012		2011		2013			2012			2011			2013			2012			2011
	Interest rate lock contracts(3)	$	—			$	—	$	—	$	(.4	)	$	(.5	)	$	(.5	)	$	—		$	—		$	—
	Foreign currency forward contracts(4)	(5.8		)		8.7		0.1		(1.6		)	0.5			6			(.3		)	(.3		)	0.3
	Total	$	(5.8	)		$	8.7	$	0.1	$	(2.0	)	$	—		$	5.5		$	(.3	)	$	(.3	)	$	0.3
	-1	Changes in the fair value of cash flow hedges are recorded in AOCI.  Amounts recorded in AOCI associated with cash flow hedges are subsequently reclassified into contract drilling, depreciation or interest expense as earnings are affected by the underlying hedged forecasted transaction.
	(2)	Gains and losses recognized in income for ineffectiveness and amounts excluded from effectiveness testing were included in other, net, in our consolidated statements of income.
	(3)	Losses on interest rate lock derivatives reclassified from AOCI into income (effective portion) were included in interest expense, net in our consolidated statements of income.
	(4)	During the year ended December 31, 2013, $2.5 million of losses were reclassified from AOCI into contract drilling expense and $900,000 of gains were reclassified from AOCI into depreciation expense in our consolidated statement of income.
Schedule Of Estimated Amount Of Net Gains Associated With Derivatives	'
	As of December 31, 2013, the estimated amount of net losses associated with derivatives, net of tax, that will be reclassified to earnings during the next 12 months was as follows (in millions):
	Net unrealized (losses) to be reclassified to contract drilling expense		$	(1.7	)
	Net realized gains to be reclassified to depreciation expense		0.9
	Net realized (losses) to be reclassified to interest expense		(.4		)
	Net (losses) to be reclassified to earnings		$	(1.2	)

Shareholders_Equity_Tables

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2013
Stockholders' Equity Note [Abstract]	'
Schedule Of Activity In Our Various Shareholders' Equity	'
	Activity in our various shareholders' equity accounts for each of the years in the three-year period ended December 31, 2013 was as follows (in millions):
		Shares	Par Value		Additional			Retained			AOCI			Treasury			Noncontrolling
					Paid-in			Earnings						Shares			Interest
					Capital
	BALANCE, December 31, 2010	150.1	$	15.1	$	637.1		$	5,305.00		$	11.1		$	(8.8	)	$	5.5
	Net income	—	—		—			600.4			—			—			5.2
	Cash dividends paid	—	—		—			(292.3		)	—			—			—
	Distributions to noncontrolling interests	—	—		—			—			—			—			(5.5		)
	Shares issued under share-based compensation plans, net	—	—		39.7			—			—			0.2			—
	Shares issued in connection with the Merger	85.8	8.6		4,568.90			—			—			—			—
	Fair value of share options assumed in connection with the Merger	—	—		35.4			—			—			—			—
	Equity issuance costs	—	—		(70.5		)	—			—			—			—
	Tax benefit from share-based compensation	—	—		0.5			—			—			—			—
	Repurchase of shares	—	—		—			—			—			(10.5		)	—
	Share-based compensation cost	—	—		41.9			—			—			—			—
	Net other comprehensive loss	—	—		—			—			(2.5		)	—			—
	BALANCE, December 31, 2011	235.9	23.7		5,253.00			5,613.10			8.6			(19.1		)	5.2
	Net income	—	—		—			1,169.70			—			—			7
	Cash dividends paid	—	—		—			(348.1		)	—			—			—
	Distributions to noncontrolling interests	—	—		—			—			—			—			(6.5		)
	Shares issued in connection with share-based compensation plans, net	1.8	0.2		35.3			—			—			(.1		)	—
	Equity issuance cost refunds	—	—		66.7			—			—			—			—
	Tax deficiency from share-based compensation	—	—		(1.0		)	—			—			—			—
	Repurchase of shares	—	—		—			—			—			(11.8		)	—
	Share-based compensation cost	—	—		44.7			—			—			—			—
	Net other comprehensive income	—	—		—			—			11.5			—			—
	BALANCE, December 31, 2012	237.7	23.9		5,398.70			6,434.70			20.1			(31.0		)	5.7
	Net income	—	—		—			1,418.20			—			—			9.7
	Cash dividends paid	—	—		—			(525.6		)	—			—			—
	Distributions to noncontrolling interests	—	—		—			—			—			—			(8.1		)
	Shares issued in connection with share-based compensation plans, net	1.9	0.2		21.8			—			—			(.1		)	—
	Tax benefit from share-based compensation	—	—		0.1			—			—			—			—
	Repurchase of shares	—	—		—			—			—			(14.1		)	—
	Share-based compensation cost	—	—		46.6			—			—			—			—
	Net other comprehensive loss	—	—		—			—			(1.9		)	—			—
	BALANCE, December 31, 2013	239.6	$	24.1	$	5,467.20		$	7,327.30		$	18.2		$	(45.2	)	$	7.3

Benefit_Plans_Tables

Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Summary Of Non-Vested Share Award Related Compensation Expense Recognized	'
	The following table summarizes non-vested share award related compensation expense recognized during each of the years in the three-year period ended December 31, 2013 (in millions):
		2013				2012				2011
	Contract drilling	$	21.3			$	17.1			$	17
	General and administrative	21.6				24.8				21.5
	Non-vested share award related compensation expense included in operating expenses	42.9				41.9				38.5
	Tax benefit	(5.4		)		(7.0		)		(6.9		)
	Total non-vested share award related compensation expense included in net income	$	37.5			$	34.9			$	31.6
Summary Of Value Of Non-Vested Share Awards Granted And Vested	'
	The following table summarizes the value of non-vested share awards granted and vested during each of the years in the three-year period ended December 31, 2013:
		2013				2012				2011
	Weighted-average grant-date fair value of	$	59.79			$	48.32			$	52.5
	non-vested share awards granted (per share)
	Total fair value of non-vested share awards	$	49.6			$	42.5			$	41
	vested during the period (in millions)
Summary Of Non-Vested Share Award Activity	'
	The following table summarizes non-vested share award activity for the year ended December 31, 2013 (shares in thousands):
		Shares			Weighted-Average
					Grant-Date
					Fair Value
	Non-vested share awards as of December 31, 2012	2,491			$	46.52
	Granted	1,018			59.79
	Vested	(829	)		49.96
	Forfeited	(184	)		49.16
	Non-vested share awards as of December 31, 2013	2,496			$	52.95
Summary Of Option Related Compensation Expense Recognized	'
	The following table summarizes option related compensation expense recognized during each of the years in the three-year period ended December 31, 2013 (in millions):
		2013				2012				2011
	General and administrative	$	0.8			$	1.6			$	2.5
	Option related compensation expense included in operating expenses	0.8				1.6				2.5
	Tax benefit	(.1		)		(.3		)		(.5		)
	Total option related compensation expense included in net income	$	0.7			$	1.3			$	2
Weighted-Average Assumptions Utilizing The Black-Scholes Model	'
	The following weighted-average assumptions were utilized in the Black-Scholes model for options granted during the year ended December 31, 2011:
			2011
	Risk-free interest rate		1.4	%
	Expected term (in years)		3.7
	Expected volatility		50.2	%
	Dividend yield		2.6	%
Summary Of Option Activity	'
	The following table summarizes option activity for the year ended December 31, 2013 (shares and intrinsic value in thousands, term in years):
		Shares			Weighted-Average				Weighted-Average			Intrinsic
					Exercise Price				Contractual			Value
									Term
	Outstanding as of December 31, 2012	1,346			$	46.05
	Granted	—			—
	Exercised	(506	)		43.96
	Forfeited	—			—
	Expired	(26	)		51.24
	Outstanding as of December 31, 2013	814			$	47.18			2.5			$	9,065
	Exercisable as of December 31, 2013	780			$	46.85			2.4			$	8,986
Summary Of Value Of Options Granted And Exercised	'
	The following table summarizes the value of options granted and exercised during each of the years in the three-year period ended December 31, 2013:
		2013				2012				2011
	Weighted-average grant-date fair value of	$	—			$	—			$	19.05
	options granted (per share)
	Intrinsic value of options exercised during	$	8.7			$	17.8			$	17.2
	the year (in millions)
Summary Of Options Outstanding	'
	The following table summarizes information about options outstanding as of December 31, 2013 (shares in thousands):
			Options Outstanding						Options Exercisable
			Number		Weighted-Average		Weighted-Average		Number		Weighted-Average
					Remaining
	Exercise Prices		Outstanding		Contractual Life		Exercise Price		Exercisable		Exercise Price
	$21.54 - $40.99		247		3.1 years		$33.51		247		$33.51
	41.18 - 54.30		229		3.5 years		43.77		217		43.22
	55.34 - 60.74		338		1.3 years		59.5		316		59.79
			814		2.5 years		$47.18		780		$46.85

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Changes In The Carrying Amount Of Goodwill	'
	The carrying amount of goodwill as of December 31, 2013 is detailed below by reporting unit (in millions):
	Floaters		$3,081.40
	Jackups	192.6
	Total		$3,274.00
Schedule of Other Intangible Assets and Liabilities	'
	The gross carrying amounts of our drilling contract intangibles, which we consider to be definite-lived intangibles assets and intangible liabilities, and accumulated amortization as of December 31, 2013 and 2012 were as follows (in millions):
		December 31, 2013										December 31, 2012
		Gross Carrying Amount				Accumulated Amortization			Net Carrying Amount			Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
	Drilling contract intangible assets
	Balance, beginning of period	$	209			$	(88.3	)	$	120.7		$	209	$	(36.4	)	$	172.6
	Amortization	—				(42.3		)	(42.3		)	—		(51.9		)	(51.9		)
	Balance, end of period	$	209			$	(130.6	)	$	78.4		$	209	$	(88.3	)	$	120.7
	Drilling contract intangible liabilities
	Balance, beginning of period	$	278			$	(160.0	)	$	118		$	278	$	(92.8	)	$	185.2
	Amortization	—				(48.9		)	(48.9		)	—		(67.2		)	(67.2		)
	Balance, end of period	$	278			$	(208.9	)	$	69.1		$	278	$	(160.0	)	$	118
Schedule of Expected Amortization Income (Expense)	'
	The estimated net (reduction) increase to future operating revenues related to the amortization of these intangible assets and liabilities as of December 31, 2013, is as follows (in millions):
	2014		$	(4.3	)
	2015		(4.5		)
	2016		(.8		)
	2017		0.3
	Total		$	(9.3	)

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]	'
Summary Of Components Of Provision For Income Taxes From Continuing Operations	'
	The following table summarizes components of the provision for income taxes from continuing operations for each of the years in the three-year period ended December 31, 2013 (in millions):
		2013				2012				2011
	Current income tax expense:
	U.S.	$	94.2			$	45			$	36.4
	Non-U.S.	107.3				166				88.3
		201.5				211				124.7
	Deferred income tax expense (benefit):
	U.S.	19.8				29.6				(9.7		)
	Non-U.S.	(8.6		)		(2.5		)		(3.4		)
		11.2				27.1				(13.1		)
	Total income tax expense	$	212.7			$	238.1			$	111.6
Summary Of Significant Components Of Deferred Income Tax Assets (Liabilities)	'
	The following table summarizes significant components of deferred income tax assets (liabilities) as of December 31, 2013 and 2012 (in millions):
			2013				2012
	Deferred tax assets:
	Foreign tax credits		$	159			$	173.4
	Premium on long-term debt		111.9				124
	Net operating loss carryforwards		104				87.8
	Employee benefits, including share-based compensation		41.7				33.4
	Deferred revenue		19.4				22.7
	Other		19.8				24.5
	Total deferred tax assets		455.8				465.8
	Valuation allowance		(232.6		)		(227.1		)
	Net deferred tax assets		223.2				238.7
	Deferred tax liabilities:
	Property and equipment		(453.6		)		(472.9		)
	Intercompany transfers of property		(29.2		)		(32.2		)
	Deferred costs		(11.4		)		(20.9		)
	Other		(24.0		)		(31.3		)
	Total deferred tax liabilities		(518.2		)		(557.3		)
	Net deferred tax liability		$	(295.0	)		$	(318.6	)
	Net current deferred tax asset		$	20.9			$	13.8
	Net noncurrent deferred tax liability		(315.9		)		(332.4		)
	Net deferred tax liability		$	(295.0	)		$	(318.6	)
Summary Of Effective Income Tax Rate On Continuing Operations	'
	Our consolidated effective income tax rate on continuing operations for each of the years in the three-year period ended December 31, 2013, differs from the U.K. statutory income tax rate as follows:
		2013			2012			2011
	U.K. statutory income tax rate	23.3	%		24.5	%		26.5	%
	Non-U.K. taxes	(13.7	)		(17.3	)		(18.1	)
	Valuation allowance	1.9			4.8			4.7
	Net expense associated with uncertain tax positions and other adjustments relating to prior years	0.6			1			0.8
	Amortization of net deferred charges	0.1			0.4			0.8
	associated with intercompany rig sales
	Income taxes associated with restructuring transactions	—			3.7			—
	Other	0.6			(.1	)		0.4
	Effective income tax rate	12.8	%		17	%		15.1	%
Summary Of Reconciliation Of The Beginning And Ending Amount Of Unrecognized Tax Benefits	'
	A reconciliation of the beginning and ending amount of unrecognized tax benefits for the years ended December 31, 2013 and 2012 is as follows (in millions):
			2013				2012
	Balance, beginning of year		$	110.7			$	53.6
	Increases in unrecognized tax benefits as a result		35.8				21.3
	of tax positions taken during prior years
	Increases in unrecognized tax benefits as a result		10				60.7
	of tax positions taken during the current year
	Decreases in unrecognized tax benefits as a result		(3.7		)		(.4		)
	of tax positions taken during prior years
	Settlements with taxing authorities		—				(4.1		)
	Lapse of applicable statutes of limitations		(1.1		)		(20.8		)
	Impact of foreign currency exchange rates		—				0.4
	Balance, end of year		$	151.7			$	110.7

Discontinued_Operations_Tables

Discontinued Operations (Tables)	12 Months Ended
	Dec. 31, 2013
Discontinued Operations and Disposal Groups [Abstract]	'
Summary Of Rig Sales and Income From Discontinued Operations	'
	We sold the following rigs during the three-year period ended December 31, 2013 (in millions):
	Rig	Date of Rig Sale		Segment(1)	Net Proceeds			Net Book Value(2)			Pre-tax (Loss)/Gain(3)
	Pride Pennsylvania	Mar-13		Jackups	$	15.5		$	15.7		$	(.2	)
	ENSCO 5003	Dec-12		Floaters	68.2			89.4			(21.2		)
	Pride Hawaii	Oct-12		Jackups	18.8			16.8			2
	ENSCO I	Sep-12		Other	4.5			12.3			(7.8		)
	ENSCO 61	Jun-12		Jackups	31.7			19.6			12.1
	ENSCO 59	May-12		Jackups	22.8			21.9			0.9
	ENSCO 95	Jun-11		Jackups	41.5			28.8			12.7
					$	203		$	204.5		$	(1.5	)
	(1) The rigs' operating results were reclassified to discontinued operations in our consolidated statements of income for each of the years in the three-year period ended December 31, 2013 and were previously included within the operating segment noted in the above table.
	(2) Includes the rig's net book value as well as inventory and other assets on the date of the sale.
	(3) The pre-tax (loss)/gain was included in loss from discontinued operations, net in our consolidated statement of income in the year of sale. Income tax expense of $900,000 and $10.9 million was recognized in connection with the sale of assets during the years ended December 31, 2013 and December 31, 2011, respectively. There was no net income tax expense recognized in connection with the sale of assets during the year ended December 31, 2012.
	The following table summarizes (loss) income from discontinued operations for each of the years in the three-year period ended December 31, 2013 (in millions):
		2013			2012			2011
	Revenues	$	399.9		$	438.2		$	243.5
	Operating expenses	412.6			406.9			258.7
	Operating (loss) income	(12.7		)	31.3			(15.2		)
	Other income	0.3			1.3			0.2
	Income tax (expense) benefit	(10.6		)	1			(8.6		)
	(Loss) gain on disposal of discontinued operations, net	(1.1		)	(16.5		)	1.8
	(Loss) income from discontinued operations	$	(24.1	)	$	17.1		$	(21.8	)

Commitments_And_Contingencies_

Commitments And Contingencies (Tables)	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Capital Commitments	'
	The following table summarizes the cumulative amount of contractual payments made as of December 31, 2013 for our rigs under construction and estimated timing of our remaining contractual payments (in millions):
			Cumulative Paid(1)		2014		2015		2016		Total(2)
	ENSCO DS-8		161.4		383.2		—		—		544.6
	ENSCO DS-9		157.4		373.2		—		—		530.6
	ENSCO DS-10		103		103		307.4		—		513.4
	ENSCO 110		41		—		166.1		—		207.1
	ENSCO 122		49		202		—		—		251
	ENSCO 123		53.5		—		—		213.8		267.3
			$	565.3	$	1,061.40	$	473.5	$	213.8	$	2,314.00
	-1	Cumulative paid represents the aggregate amount of contractual payments made from commencement of the construction agreement through December 31, 2013.
	-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.

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2013
Segment Reporting Information, Revenue for Reportable Segment [Abstract]	'
Schedule Of Segment Reporting Information	'
	Year Ended December 31, 2013
		Floaters			Jackups		Other		Operating Segments Total		Reconciling Items			Consolidated Total
	Revenues	$	2,760.80		$	1,684.00	$	75.1	$	4,519.90	$	—		$	4,519.90
	Operating expenses
	Contract drilling	1,209.70			811.9		58.5		2,080.10		—			2,080.10
	(exclusive of depreciation)
	Depreciation	364.8			156.9		—		521.7		6.5			528.2
	General and administrative	—			—		—		—		146.8			146.8
	Operating income (loss)	$	1,186.30		$	715.2	$	16.6	$	1,918.10	$	(153.3	)	$	1,764.80
	Property and equipment, net	$	11,303.40		$	2,961.60	$	—	$	14,265.00	$	46		$	14,311.00
	Capital expenditures	$	1,031.30		$	710.6	$	—	$	1,741.90	$	26.6		$	1,768.50
	Year Ended December 31, 2012
		Floaters			Jackups		Other		Operating Segments Total		Reconciling Items			Consolidated Total
	Revenues	$	2,300.80		$	1,485.60	$	82.8	$	3,869.20	$	—		$	3,869.20
	Operating expenses
	Contract drilling	956			730.8		61.1		1,747.90		—			1,747.90
	(exclusive of depreciation)
	Depreciation	305.7			161.5		—		467.2		8.9			476.1
	General and administrative	—			—		—		—		148.9			148.9
	Operating income (loss)	$	1,039.10		$	593.3	$	21.7	$	1,654.10	$	(157.8	)	$	1,496.30
	Property and equipment, net	$	10,727.60		$	2,389.80	$	—	$	13,117.40	$	28.2		$	13,145.60
	Capital expenditures	$	1,520.10		$	192.2	$	—	$	1,712.30	$	2.7		$	1,715.00
	Year Ended December 31, 2011
		Floaters			Jackups		Other		Operating Segments Total		Reconciling Items			Consolidated Total
	Revenues	$	1,352.60		$	1,194.20	$	52.4	$	2,599.20	$	—		$	2,599.20
	Operating expenses
	Contract drilling	630.2			613		42.9		1,286.10		—			1,286.10
	(exclusive of depreciation)
	Depreciation	189.1			164.1		—		353.2		4.4			357.6
	General and administrative	—			—		—		—		158.6			158.6
	Operating income (loss)	$	533.3		$	417.1	$	9.5	$	959.9	$	(163.0	)	$	796.9
	Property and equipment, net	$	9,923.60		$	2,462.40	$	12.8	$	12,398.80	$	23.1		$	12,421.90
	Capital expenditures	$	355.4		$	276.3	$	—	$	631.7	$	14		$	645.7
Schedule Of Geographic Distribution Of Rigs By Segment	'
	As of December 31, 2013, the geographic distribution of our drilling rigs by operating segment was as follows:
		Floaters(1)		Jackups(1)	Total(1)(2)
	North & South America (excluding Brazil)	8		14	22
	Middle East & Africa	6		10	16
	Asia & Pacific Rim	3		10	13
	Europe & Mediterranean	2		10	12
	Brazil	7		—	7
	Asia & Pacific Rim (under construction)	3		3	6
	Total	29		47	76
	(1)	The table above includes the five floaters classified as "held for sale" as of June 30, 2014, as well as ENSCO 69, Pride Wisconsin and ENSCO 85 which were sold during 2014.
	(2)	We provide management services on two rigs owned by third-parties not included in the table above.
Schedule Of Revenues And Long-Lived Assets By Geographical Segment	'
	Information by country for those countries that account for more than 10% of total revenues or 10% of our long-lived assets was as follows (in millions):
		Revenues							Long-lived Assets
		2013			2012		2011		2013		2012			2011
	United States	$	1,724.90		$	1,291.30	$	753.8	$	4,617.80	$	4,525.90		$	3,450.60
	Brazil	683.7			776.3		430.9		2,447.50		2,911.30			3,101.80
	Angola	467.1			341.6		209.5		2,543.70		2,147.20			1,347.90
	Other countries	1,644.20			1,460.00		1,205.00		4,702.00		3,561.20			4,521.60
	Total	$	4,519.90		$	3,869.20	$	2,599.20	$	14,311.00	$	13,145.60		$	12,421.90

Supplemental_Financial_Informa1

Supplemental Financial Information (Tables)	12 Months Ended
	Dec. 31, 2013
Supplemental Financial Information [Abstract]	'
Accounts Receivable, Net	'
	Accounts receivable, net, as of December 31, 2013 and 2012 consisted of the following (in millions):
			2013				2012
	Trade		$	869.8			$	812.4
	Other		14.3				18.2
			884.1				830.6
	Allowance for doubtful accounts		(28.4		)		(19.2		)
			$	855.7			$	811.4
Other Current Assets	'
	Other current assets as of December 31, 2013 and 2012 consisted of the following (in millions):
			2013				2012
	Inventory		$	256.4			$	207.8
	Prepaid taxes		88.1				62.2
	Short-term investments		50				50
	Deferred costs		47.4				46.9
	Deferred tax assets		23.1				14.6
	Prepaid expenses		18.5				20.3
	Derivative assets		11.6				5.2
	Assets held for sale		8.6				14.2
	Other		10.2				4.2
			$	513.9			$	425.4
Other Assets, Net	'
	Other assets, net, as of December 31, 2013 and 2012 consisted of the following (in millions):
			2013				2012
	Intangible assets		$	83.8			$	143.3
	Deferred costs		59.1				45.2
	Unbilled receivables		51.9				77.1
	Prepaid taxes on intercompany transfers of property		50.2				58.3
	Supplemental executive retirement plan assets		37.7				29.8
	Warranty and other claim receivables		30.6				30.6
	Deferred tax assets		25.2				19.3
	Wreckage and debris removal receivables		0.5				13.2
	Other		13.7				5
			$	352.7			$	421.8
Accrued Liabilities And Other	'
	Accrued liabilities and other as of December 31, 2013 and 2012 consisted of the following (in millions):
			2013				2012
	Personnel costs		$	242			$	231.1
	Deferred revenue		169.8				146.9
	Taxes		84.2				86.9
	Accrued interest		68				67.9
	Advance payment received on sale of assets		33				—
	Customer pre-payments		20				—
	Wreckage and debris removal		—				9
	Other		41.7				42.6
			$	658.7			$	584.4
Other Liabilities	'
	Other liabilities as of December 31, 2013 and 2012 consisted of the following (in millions):
			2013				2012
	Deferred revenue		$	217.6			$	224.5
	Unrecognized tax benefits (inclusive of interest and penalties)		148				129.6
	Intangible liabilities		69.1				118
	Supplemental executive retirement plan liabilities		40.5				33.3
	Personnel costs		37.2				31.6
	Other		33.3				36.4
			$	545.7			$	573.4
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	'
	Accumulated other comprehensive income as of December 31, 2013 and 2012 consisted of the following (in millions):
		2013				2012
	Derivative Instruments	$	20.6			$	24.4
	Other	(2.4		)		(4.3		)
		$	18.2			$	20.1
Repair And Maintenance Expense Related To Continuing Operations	'
	Repair and maintenance expense related to continuing operations for each of the years in the three-year period ended December 31, 2013 was as follows (in millions):
			2013				2012			2011
	Repair and maintenance expense		$	311.7			$	294.7		$	223.6
Schedule of Cash Flows Information	'
	Net cash provided by operating activities of continuing operations attributable to the net change in operating assets and liabilities for each of the years in the three-year period ended December 31, 2013 was as follows (in millions):
			2013				2012			2011
	(Increase) decrease in other assets		$	(98.4	)		$	68.3		$	6.7
	(Decrease) increase in liabilities		(10.6		)		312			(33.9		)
	(Increase) decrease in accounts receivable		(29.3		)		46.1			(215.9		)
			$	(138.3	)		$	426.4		$	(243.1	)
Cash Paid For Interest And Income Taxes	'
	Cash paid for interest and income taxes of continuing operations for each of the years in the three-year period ended December 31, 2013 was as follows (in millions):
			2013				2012			2011
	Interest, net of amounts capitalized		$	182.2			$	150.7		$	28.6
	Income taxes		203.9				88.1			113.7

Guarantee_Of_Registered_Securi1

Guarantee Of Registered Securities (Tables)	12 Months Ended
	Dec. 31, 2013
Guarantees [Abstract]	'
Condensed Consolidating Statements Of Income	'
	ENSCO PLC AND SUBSIDIARIES
	CONDENSED CONSOLIDATING STATEMENTS OF INCOME
	Year Ended December 31, 2013
	(in millions)
		Ensco plc			ENSCO International Incorporated			Pride International, Inc.			Other Non-guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
	OPERATING REVENUES	$	35		$	149.4		$	—		$	4,642.90		$	(307.4	)	$	4,519.90
	OPERATING EXPENSES
	Contract drilling (exclusive of depreciation)	27.5			149.4			—			2,210.60			(307.4		)	2,080.10
	Depreciation	0.3			4			—			523.9			—			528.2
	General and administrative	63.5			0.5			—			82.8			—			146.8
	OPERATING (LOSS) INCOME	(56.3		)	(4.5		)	—			1,825.60			—			1,764.80
	OTHER (EXPENSE) INCOME, NET	(65.6		)	(9.4		)	(27.9		)	2.8			—			(100.1		)
	(LOSS) INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(121.9		)	(13.9		)	(27.9		)	1,828.40			—			1,664.70
	INCOME TAX PROVISION	—			92.5			—			120.2			—			212.7
	DISCONTINUED OPERATIONS, NET	—			—			—			(24.1		)	—			(24.1		)
	EQUITY EARNINGS IN AFFILIATES, NET OF TAX	1,540.10			366.2			111.6			—			(2,017.9		)	—
	NET INCOME	1,418.20			259.8			83.7			1,684.10			(2,017.9		)	1,427.90
	NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—			—			—			(9.7		)	—			(9.7		)
	NET INCOME ATTRIBUTABLE TO ENSCO	$	1,418.20		$	259.8		$	83.7		$	1,674.40		$	(2,017.9	)	$	1,418.20
	ENSCO PLC AND SUBSIDIARIES
	CONDENSED CONSOLIDATING STATEMENTS OF INCOME
	Year Ended December 31, 2012
	(in millions)
		Ensco plc			ENSCO International Incorporated			Pride International, Inc.			Other Non-guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
	OPERATING REVENUES	$	44		$	147.6		$	—		$	3,997.70		$	(320.1	)	$	3,869.20
	OPERATING EXPENSES
	Contract drilling (exclusive of depreciation)	51.2			147.6			—			1,869.20			(320.1		)	1,747.90
	Depreciation	0.4			3.5			—			472.2			—			476.1
	General and administrative	63.8			0.4			—			84.7			—			148.9
	OPERATING (LOSS) INCOME	(71.4		)	(3.9		)	—			1,571.60			—			1,496.30
	OTHER (EXPENSE) INCOME, NET	(41.8		)	(7.0		)	(50.0		)	0.2			—			(98.6		)
	(LOSS) INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(113.2		)	(10.9		)	(50.0		)	1,571.80			—			1,397.70
	INCOME TAX PROVISION	—			68.8			—			169.3			—			238.1
	DISCONTINUED OPERATIONS, NET	—			—			—			17.1			—			17.1
	EQUITY EARNINGS IN AFFILIATES, NET OF TAX	1,282.90			335.9			239.2			—			(1,858.0		)	—
	NET INCOME	1,169.70			256.2			189.2			1,419.60			(1,858.0		)	1,176.70
	NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—			—			—			(7.0		)	—			(7.0		)
	NET INCOME ATTRIBUTABLE TO ENSCO	$	1,169.70		$	256.2		$	189.2		$	1,412.60		$	(1,858.0	)	$	1,169.70
	ENSCO PLC AND SUBSIDIARIES
	CONDENSED CONSOLIDATING STATEMENTS OF INCOME
	Year Ended December 31, 2011
	(in millions)
		Ensco plc			ENSCO International Incorporated			Pride International, Inc.			Other Non-guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
	OPERATING REVENUES	$	—		$	70		$	—		$	2,671.00		$	(141.8	)	$	2,599.20
	OPERATING EXPENSES
	Contract drilling (exclusive of depreciation)	46.9			70			—			1,311.00			(141.8		)	1,286.10
	Depreciation	0.4			1.8			—			355.4			—			357.6
	General and administrative	52.2			—			—			106.4			—			158.6
	OPERATING (LOSS) INCOME	(99.5		)	(1.8		)	—			898.2			—			796.9
	OTHER INCOME (EXPENSE), NET	32.1			0.4			(22.7		)	(67.7		)	—			(57.9		)
	(LOSS) INCOME BEFORE INCOME TAXES	(67.4		)	(1.4		)	(22.7		)	830.5			—			739
	INCOME TAX PROVISION	—			38.5			1.5			71.6			—			111.6
	DISCONTINUED OPERATIONS, NET	—			(11.1		)	—			(10.7		)				(21.8		)
	EQUITY EARNINGS IN AFFILIATES, NET OF TAX	667.8			271.5			143.9			—			(1,083.2		)	—
	NET INCOME	600.4			220.5			119.7			748.2			(1,083.2		)	605.6
	NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—			—			—			(5.2		)	—			(5.2		)
	NET INCOME ATTRIBUTABLE TO ENSCO	$	600.4		$	220.5		$	119.7		$	743		$	(1,083.2	)	$	600.4
Schedule of Condensed Consolidated Statements of Comprehensive Income	'
	ENSCO PLC AND SUBSIDIARIES
	CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
	Year Ended December 31, 2013
	(in millions)
		Ensco plc			ENSCO International Incorporated			Pride International, Inc.			Other Non-Guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
	NET INCOME	$	1,418.20		$	259.8		$	83.7		$	1,684.10		$	(2,017.9	)	$	1,427.90
	OTHER COMPREHENSIVE (LOSS) INCOME, NET
	Net change in fair value of derivatives	—			(5.8		)	—			—			—			(5.8		)
	Reclassification of net losses on derivative instruments from other comprehensive income into net income	—			2			—			—			—			2
	Other	—			—			—			1.9			—			1.9
	NET OTHER COMPREHENSIVE (LOSS) INCOME	—			(3.8		)	—			1.9			—			(1.9		)
	COMPREHENSIVE INCOME	1,418.20			256			83.7			1,686.00			(2,017.9		)	1,426.00
	COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—			—			—			(9.7		)	—			(9.7		)
	COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	$	1,418.20		$	256		$	83.7		$	1,676.30		$	(2,017.9	)	$	1,416.30
	ENSCO PLC AND SUBSIDIARIES
	CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
	Year Ended December 31, 2012
	(in millions)
					ENSCO International Incorporated			Pride International, Inc.			Other Non-Guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
		Ensco plc
	NET INCOME	$	1,169.70		$	256.2		$	189.2		$	1,419.60		$	(1,858.0	)	$	1,176.70
	OTHER COMPREHENSIVE INCOME (LOSS), NET
	Net change in fair value of derivatives	—			6.3			—			2.4			—			8.7
	Reclassification of net losses (gains) on derivative instruments from other comprehensive income into net income	—			0.2			—			(.2		)	—			—
	Other	—			—			—			2.8			—			2.8
	NET OTHER COMPREHENSIVE INCOME	—			6.5			—			5			—			11.5
	COMPREHENSIVE INCOME	1,169.70			262.7			189.2			1,424.60			(1,858.0		)	1,188.20
	COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—			—			—			(7.0		)	—			(7.0		)
	COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	$	1,169.70		$	262.7		$	189.2		$	1,417.60		$	(1,858.0	)	$	1,181.20
	ENSCO PLC AND SUBSIDIARIES
	CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
	Year Ended December 31, 2011
	(in millions)
					ENSCO International Incorporated			Pride International, Inc.			Other Non-Guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
		Ensco plc
	NET INCOME	$	600.4		$	220.5		$	119.7		$	748.2		$	(1,083.2	)	$	605.6
	OTHER COMPREHENSIVE (LOSS) INCOME, NET
	Net change in fair value of derivatives	—			(4.2		)	—			4.3			—			0.1
	Reclassification of net losses (gains) on derivative instruments from other comprehensive income into net income	—			0.2			—			(5.7		)	—			(5.5		)
	Other	—			—			—			2.9			—			2.9
	NET OTHER COMPREHENSIVE (LOSS) INCOME	—			(4.0		)	—			1.5			—			(2.5		)
	COMPREHENSIVE INCOME	600.4			216.5			119.7			749.7			(1,083.2		)	603.1
	COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—			—			—			(5.2		)	—			(5.2		)
	COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	$	600.4		$	216.5		$	119.7		$	744.5		$	(1,083.2	)	$	597.9
Condensed Consolidating Balance Sheets	'
	ENSCO PLC AND SUBSIDIARIES
	CONDENSED CONSOLIDATING BALANCE SHEETS
	31-Dec-13
	(in millions)
		Ensco plc			ENSCO			Pride			Other			Consolidating			Total
					International Incorporated			International,			Non-guarantor			Adjustments
								Inc.			Subsidiaries of Ensco
	ASSETS
	CURRENT ASSETS
	Cash and cash equivalents	$	46.5		$	0.5		$	4.9		$	113.7		$	—		$	165.6
	Accounts receivable, net	—			—			—			855.7			—			855.7
	Accounts receivable from	1,235.00			213.8			5.5			4,169.20			(5,623.5		)	—
	affiliates
	Other	3.2			61.3			—			449.4			—			513.9
	Total current assets	1,284.70			275.6			10.4			5,588.00			(5,623.5		)	1,535.20
	PROPERTY AND EQUIPMENT, AT COST	2.1			34.3			—			17,462.10			—			17,498.50
	Less accumulated depreciation	1.5			26.5			—			3,159.50			—			3,187.50
	Property and equipment, net	0.6			7.8			—			14,302.60			—			14,311.00
	GOODWILL	—			—			—			3,274.00			—			3,274.00
	DUE FROM AFFILIATES	4,876.80			4,236.00			1,898.00			5,069.70			(16,080.5		)	—
	INVESTMENTS IN AFFILIATES	13,830.10			4,868.60			4,092.20			—			(22,790.9		)	—
	OTHER ASSETS, NET	8.8			60.1			—			283.8			—			352.7
		$	20,001.00		$	9,448.10		$	6,000.60		$	28,518.10		$	(44,494.9	)	$	19,472.90
	LIABILITIES AND SHAREHOLDERS' EQUITY
	CURRENT LIABILITIES
	Accounts payable and accrued	$	31.5		$	9.1		$	34.2		$	925		$	—		$	999.8
	liabilities
	Accounts payable to affiliates	3,666.10			549.7			—			1,407.70			(5,623.5		)	—
	Current maturities of long-term	—			—			—			47.5			—			47.5
	debt
	Total current liabilities	3,697.60			558.8			34.2			2,380.20			(5,623.5		)	1,047.30
	DUE TO AFFILIATES	1,030.80			2,760.40			1,331.10			10,958.20			(16,080.5		)	—
	LONG-TERM DEBT	2,473.70			149.1			2,007.80			88.3			—			4,718.90
	DEFERRED INCOME TAXES	—			358.3			—			3.8			—			362.1
	OTHER LIABILITIES	—			2.3			8.7			534.7			—			545.7
	ENSCO SHAREHOLDERS' EQUITY	12,798.90			5,619.20			2,618.80			14,545.60			(22,790.9		)	12,791.60
	NONCONTROLLING INTERESTS	—			—			—			7.3			—			7.3
	Total equity	12,798.90			5,619.20			2,618.80			14,552.90			(22,790.9		)	12,798.90
		$	20,001.00		$	9,448.10		$	6,000.60		$	28,518.10		$	(44,494.9	)	$	19,472.90
	ENSCO PLC AND SUBSIDIARIES
	CONDENSED CONSOLIDATING BALANCE SHEETS
	31-Dec-12
	(in millions)
		Ensco plc			ENSCO			Pride			Other			Consolidating			Total
					International Incorporated			International, Inc.			Non-guarantor			Adjustments
											Subsidiaries of Ensco
	ASSETS
	CURRENT ASSETS
	Cash and cash equivalents	$	271.8		$	1.7		$	85		$	128.6		$	—		$	487.1
	Accounts receivable, net	—			0.2			—			811.2			—			811.4
	Accounts receivable from	1,294.50			226.5			—			2,375.10			(3,896.1		)	—
	affiliates
	Other	2.8			24.9			—			397.7			—			425.4
	Total current assets	1,569.10			253.3			85			3,712.60			(3,896.1		)	1,723.90
	PROPERTY AND EQUIPMENT, AT COST	2.1			30.2			—			15,704.80			—			15,737.10
	Less accumulated depreciation	1.1			23.5			—			2,566.90			—			2,591.50
	Property and equipment, net	1			6.7			—			13,137.90			—			13,145.60
	GOODWILL	—			—			—			3,274.00			—			3,274.00
	DUE FROM AFFILIATES	3,483.50			3,594.70			1,628.40			4,748.90			(13,455.5		)	—
	INVESTMENTS IN AFFILIATES	13,469.30			2,693.80			3,824.80			—			(19,987.9		)	—
	OTHER ASSETS, NET	11.3			67.4			—			343.1			—			421.8
		$	18,534.20		$	6,615.90		$	5,538.20		$	25,216.50		$	(37,339.5	)	$	18,565.30
	LIABILITIES AND SHAREHOLDERS' EQUITY
CURRENT LIABILITIES
Accounts payable and accrued	$	31		$	28.1		$	34.1		$	849		$	—		$	942.2
liabilities
Accounts payable to affiliates	2,364.80			136.9			—			1,394.40			(3,896.1		)	—
Current maturities of long-term	—			—			—			47.5			—			47.5
debt
Total current liabilities	2,395.80			165			34.1			2,290.90			(3,896.1		)	989.7
DUE TO AFFILIATES	1,816.70			2,054.70			877.5			8,706.60			(13,455.5		)	—
LONG-TERM DEBT	2,469.60			149			2,040.80			139			—			4,798.40
DEFERRED INCOME TAXES	—			335.1			—			16.6			—			351.7
OTHER LIABILITIES	—			—			10.8			562.6			—			573.4
ENSCO SHAREHOLDERS' EQUITY	11,852.10			3,912.10			2,575.00			13,495.10			(19,987.9		)	11,846.40
NONCONTROLLING INTERESTS	—			—			—			5.7			—			5.7
Total equity	11,852.10			3,912.10			2,575.00			13,500.80			(19,987.9		)	11,852.10
	$	18,534.20		$	6,615.90		$	5,538.20		$	25,216.50		$	(37,339.5	)	$	18,565.30
Condensed Consolidating Statements Of Cash Flows	'
	ENSCO PLC AND SUBSIDIARIES
	CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
	Year Ended December 31, 2013
	(in millions)
		Ensco plc			ENSCO International Incorporated			Pride International, Inc.			Other Non-guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
	OPERATING ACTIVITIES
	Net cash (used in) provided by	$	(114.8	)	$	(128.7	)	$	(62.9	)	$	2,193.10		$	—		$	1,886.70
	operating activities of continuing operations
	INVESTING ACTIVITIES
	Additions to property and equipment	—			—			—			(1,768.5		)	—			(1,768.5		)
	Purchases of short-term investments	—			—			—			(50.0		)	—			(50.0		)
	Maturities of short-term investments	—			—			—			50			—			50
	Other	—			(4.1		)	—			10.1			—			6
	Net cash used in investing activities of continuing operations	—			(4.1		)	—			(1,758.4		)	—			(1,762.5		)
	FINANCING ACTIVITIES
	Cash dividends paid	(525.6		)	—			—			—			—			(525.6		)
	Reduction of long-term	—			—			—			(47.5		)	—			(47.5		)
	borrowings
	Proceeds from exercise of share	22.3			—			—			—			—			22.3
	options
	Debt financing costs	—			(4.6		)	—			—			—			(4.6		)
	Advances from (to) affiliates	407.2			136.2			(17.2		)	(526.2		)	—			—
	Other	(14.4		)	—			—			(7.3		)	—			(21.7		)
	Net cash (used in) provided by	(110.5		)	131.6			(17.2		)	(581.0		)	—			(577.1		)
	financing activities
	DISCONTINUED OPERATIONS
	Operating activities	—			—			—			93.8			—			93.8
	Investing activities	—			—			—			37.8			—			37.8
	Net cash provided by discontinued operations	—			—			—			131.6			—			131.6
	Effect of exchange rate changes on cash and cash equivalents	—			—			—			(.2		)	—			(.2		)
	DECREASE IN CASH AND CASH EQUIVALENTS	(225.3		)	(1.2		)	(80.1		)	(14.9		)	—			(321.5		)
	CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	271.8			1.7			85			128.6			—			487.1
	CASH AND CASH EQUIVALENTS, END OF YEAR	$	46.5		$	0.5		$	4.9		$	113.7		$	—		$	165.6
	ENSCO PLC AND SUBSIDIARIES
	CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
	Year Ended December 31, 2012
	(in millions)
		Ensco plc			ENSCO International Incorporated			Pride International, Inc.			Other Non-guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
	OPERATING ACTIVITIES
	Net cash (used in) provided by	$	(71.6	)	$	(38.2	)	$	(21.6	)	$	2,205.50		$	—		$	2,074.10
	operating activities of continuing operations
	INVESTING ACTIVITIES
	Additions to property and	—			—			—			(1,715.0		)	—			(1,715.0		)
	equipment
	Purchases of short-term investments	—			—			—			(90.0		)	—			(90.0		)
	Maturities of short-term investments	—			—			—			44.5			—			44.5
	Other	(.3		)	0.4			—			3.1			—			3.2
	Net cash (used in) provided	(.3		)	0.4			—			(1,757.4		)	—			(1,757.3		)
	by investing activities of
	continuing operations
	FINANCING ACTIVITIES
	Cash dividends paid	(348.1		)	—			—			—			—			(348.1		)
	Commercial paper borrowings,	(125.0		)	—			—			—			—			(125.0		)
	net
	Equity issuance reimbursement	66.7			—			—			—			—			66.7
	Reduction of long-term	—			—			—			(47.5		)	—			(47.5		)
	borrowings
	Proceeds from exercise of share	23.9			11.9			—			—			—			35.8
	options
	Advances from (to) affiliates	501.2			27.6			84			(612.8		)	—			—
	Other	(11.6		)	—			—			(5.8		)	—			(17.4		)
	Net cash provided by (used in)	107.1			39.5			84			(666.1		)	—			(435.5		)
	financing activities
DISCONTINUED OPERATIONS
Operating activities	—			—			—			113			—			113
Investing activities	—			—			—			60.1			—			60.1
Net cash provided by discontinued operations	—			—			—			173.1			—			173.1
Effect of exchange rate changes	—			—			—			2			—			2
on cash and cash equivalents
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	35.2			1.7			62.4			(42.9		)	—			56.4
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	236.6			—			22.6			171.5			—			430.7
CASH AND CASH EQUIVALENTS, END OF YEAR	$	271.8		$	1.7		$	85		$	128.6		$	—		$	487.1
ENSCO PLC AND SUBSIDIARIES
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
Year Ended December 31, 2011
(in millions)
	Ensco plc			ENSCO International Incorporated			Pride International, Inc.			Other Non-guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
OPERATING ACTIVITIES
Net cash provided by (used in)	$	2		$	(2.6	)	$	(59.9	)	$	817.9		$	—		$	757.4
operating activities of continuing operations
INVESTING ACTIVITIES
Acquisition of Pride International, Inc.,	—			—			92.9			(2,748.9		)	—			(2,656.0		)
net of cash acquired
Additions to property and equipment	—			—			—			(645.7		)	—			(645.7		)
Purchases of short-term investments	—			—			—			(4.5		)	—			(4.5		)
Other	—			(6.1		)	—			11.4			—			5.3
Net cash (used in) provided	—			(6.1		)	92.9			(3,387.7		)	—			(3,300.9		)
by investing activities of
continuing operations
FINANCING ACTIVITIES
Proceeds from issuance of senior	2,462.80			—			—			—			—			2,462.80
notes
Cash dividends paid	(292.3		)	—			—			—			—			(292.3		)
Reduction of long-term borrowings	—			—			(181.0		)	(32.3		)	—			(213.3		)
Commercial paper borrowings,	125			—			—			—			—			125
net
Equity issuance cost	(70.5		)	—			—			—			—			(70.5		)
Proceeds from exercise of share options	—			39.9												39.9
Debt financing costs	(27.1		)	(4.7		)	—			—			—			(31.8		)
Advances (to) from affiliates	(1,956.1		)	(34.5		)	170.6			1,820.00			—			—
Other	(10.6		)	—			—			(5.1		)	—			(15.7		)
Net cash provided by (used in) financing activities	231.2			0.7			(10.4		)	1,782.60			—			2,004.10
DISCONTINUED OPERATIONS
Operating activities	—			(11.1		)	—			(14.1		)	—			(25.2		)
Investing activities	—			—			—			(54.6		)	—			(54.6		)
Net cash used in discontinued operations	—			(11.1		)	—			(68.7		)	—			(79.8		)
Effect of exchange rate changes on cash and cash equivalents	—			—			—			(.8		)	—			(.8		)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	233.2			(19.1		)	22.6			(856.7		)	—			(620.0		)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	3.4			19.1			—			1,028.20			—			1,050.70
CASH AND CASH EQUIVALENTS, END	$	236.6		$	—		$	22.6		$	171.5		$	—		$	430.7
OF YEAR

Unaudited_Quarterly_Financial_1

Unaudited Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Data [Abstract]	'
Summary Of Unaudited Quarterly Consolidated Income Statement	'
	The following tables summarize our unaudited quarterly consolidated income statement data for the years ended December 31, 2013 and 2012 (in millions, except per share amounts):
	2013	First			Second			Third			Fourth			Year
		Quarter			Quarter			Quarter			Quarter
	Operating revenues	$	1,040.30		$	1,130.30		$	1,162.20		$	1,187.10		$	4,519.90
	Operating expenses
	Contract drilling (exclusive of depreciation)	479.8			527.2			534.3			538.8			2,080.10
	Depreciation	127.9			132			132.6			135.7			528.2
	General and administrative	37.8			36.4			37.4			35.2			146.8
	Operating income	394.8			434.7			457.9			477.4			1,764.80
	Other expense, net	(29.8		)	(39.8		)	(1.6		)	(28.9		)	(100.1		)
	Income from continuing operations before income taxes	365			394.9			456.3			448.5			1,664.70
	Provision for income taxes	50.8			48.5			65.4			48			212.7
	Income from continuing operations	314.2			346.4			390.9			400.5			1,452.00
	Loss from discontinued operations, net	5.7			16.2			(9.5		)	(36.5		)	(24.1		)
	Net income	319.9			362.6			381.4			364			1,427.90
	Net income attributable to noncontrolling interests	(2.8		)	(1.7		)	(2.6		)	(2.6		)	(9.7		)
	Net income attributable to Ensco	$	317.1		$	360.9		$	378.8		$	361.4		$	1,418.20
	Earnings (loss) per share – basic
	Continuing operations	$	1.34		$	1.48		$	1.66		$	1.71		$	6.19
	Discontinued operations	0.02			0.07			(0.04		)	(0.16		)	(0.11		)
		$	1.36		$	1.55		$	1.62		$	1.55		$	6.08
	Earnings (loss) per share – diluted
	Continuing operations	$	1.34		$	1.48		$	1.66		$	1.7		$	6.18
	Discontinued operations	0.02			0.07			(0.04		)	(0.16		)	(0.11		)
		$	1.36		$	1.55		$	1.62		$	1.54		$	6.07
	2012	First			Second			Third			Fourth			Year
		Quarter			Quarter			Quarter			Quarter
	Operating revenues	$	916.5		$	965.7		$	1,013.90		$	973.1		$	3,869.20
	Operating expenses
	Contract drilling (exclusive of depreciation)	439.9			423.4			434.1			450.5			1,747.90
	Depreciation	116.4			115.5			121.2			123			476.1
	General and administrative	38.2			35.5			40.2			35			148.9
	Operating income	322			391.3			418.4			364.6			1,496.30
	Other expense, net	(26.7		)	(24.7		)	(25.5		)	(21.7		)	(98.6		)
	Income from continuing operations before income taxes	295.3			366.6			392.9			342.9			1,397.70
	Provision for income taxes	32.8			40.4			44.3			120.6			238.1
	Income from continuing operations	262.5			326.2			348.6			222.3			1,159.60
	(Loss) income from discontinued operations, net	4.9			16.5			(3.2		)	(1.1		)	17.1
	Net income	267.4			342.7			345.4			221.2			1,176.70
	Net income attributable to noncontrolling interests	(2.0		)	(1.4		)	(1.9		)	(1.7		)	(7.0		)
	Net income attributable to Ensco	$	265.4		$	341.3		$	343.5		$	219.5		$	1,169.70
	Earnings (loss) per share – basic
	Continuing operations	$	1.13		$	1.4		$	1.49		$	0.95		$	4.97
	Discontinued operations	0.02			0.07			(0.01		)	(0.01		)	0.08
		$	1.15		$	1.47		$	1.48		$	0.94		$	5.05
	Earnings (loss) per share – diluted
	Continuing operations	$	1.13		$	1.4		$	1.49		$	0.95		$	4.97
	Discontinued operations	0.02			0.07			(0.01		)	(0.01		)	0.07
		$	1.15		$	1.47		$	1.48		$	0.94		$	5.04

Description_Of_The_Business_An3

Description Of The Business And Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	continent
	country
	segments
	service
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]	'	'	'
Number of rigs under construction	6	'	'
Number of different countries having drilling contracts spanning	20	'	'
Number of different continents having drilling contracts	6	'	'
Net foreign currency exchange gains (losses)	$6.40	($3.50)	$16.90
Short-term investments	50	50	'
Number of operating segments	3	'	'
Number of reportable segments	2	'	'
Number of services	1	'	'
Deferred mobilization revenue	76.8	52.6	'
Deferred revenue	273.6	301.9	'
Antidilutive share options excluded from computation of diluted earnings per share	0.3	0.4	'
Deferred Mobilization Costs [Member]	'	'	'
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]	'	'	'
Other assets	66.6	54.5	'
Deferred Regulatory Certification And Compliance Costs [Member]	'	'	'
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]	'	'	'
Other assets	$18.30	$14.40	'
Minimum [Member]	'	'	'
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]	'	'	'
Estimated useful lives assets, minimum years	'15 years	'	'
Maximum [Member]	'	'	'
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]	'	'	'
Estimated useful lives assets, minimum years	'35 years	'	'
Offshore Drilling Rigs [Member]	'	'	'
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]	'	'	'
Number of contract drilling rigs	'74	'	'
Ultra Deepwater Drillships [Member]	'	'	'
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]	'	'	'
Number of contract drilling rigs	'10	'	'
Semisubmersible Rigs [Member]	'	'	'
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]	'	'	'
Number of contract drilling rigs	'13	'	'
Moored Semisubmersible Rigs [Member]	'	'	'
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]	'	'	'
Number of contract drilling rigs	'6	'	'
Jackup Rigs [Member]	'	'	'
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]	'	'	'
Number of contract drilling rigs	'45	'	'
Drilling Rigs And Equipment [Member] | Minimum [Member]	'	'	'
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]	'	'	'
Estimated useful lives assets, minimum years	'4 years	'	'
Drilling Rigs And Equipment [Member] | Maximum [Member]	'	'	'
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]	'	'	'
Estimated useful lives assets, minimum years	'35 years	'	'
Buildings And Improvements [Member] | Minimum [Member]	'	'	'
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]	'	'	'
Estimated useful lives assets, minimum years	'2 years	'	'
Buildings And Improvements [Member] | Maximum [Member]	'	'	'
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]	'	'	'
Estimated useful lives assets, minimum years	'30 years	'	'
Other Equipment, Computer And Communications Hardware And Software [Member] | Minimum [Member]	'	'	'
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]	'	'	'
Estimated useful lives assets, minimum years	'2 years	'	'
Other Equipment, Computer And Communications Hardware And Software [Member] | Maximum [Member]	'	'	'
Description Of The Business And Summary Of Significant Accounting Policies [Line Items]	'	'	'
Estimated useful lives assets, minimum years	'6 years	'	'

Description_Of_The_Business_An4

Description Of The Business And Summary Of Significant Accounting Policies (Reconciliation Of Net Income Attributable To Ensco Shares Used In Basic And Diluted EPS Computations) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Description Of The Business And Summary Of Significant Accounting Policies [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Net income attributable to Ensco	$361.40	$378.80	$360.90	$317.10	$219.50	$343.50	$341.30	$265.40	$1,418.20	$1,169.70	$600.40
Net income allocated to non-vested share awards	'	'	'	'	'	'	'	'	-15.1	-12.3	-6.9
Net income attributable to Ensco shares	'	'	'	'	'	'	'	'	$1,403.10	$1,157.40	$593.50

Description_Of_The_Business_An5

Description Of The Business And Summary Of Significant Accounting Policies (Reconciliation Of The Weighted-Average Shares Used In Basic And Diluted Earnings Per Share Computations) (Details)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Description Of The Business And Summary Of Significant Accounting Policies [Abstract]	'	'	'
Weighted-average shares - basic	230.9	229.4	192.2
Potentially dilutive share options	0.2	0.3	0.4
Weighted-average shares - diluted	231.1	229.7	192.6

Description_Of_The_Business_An6

Description Of The Business And Summary Of Significant Accounting Policies (Schedule Of Income From Continuing Operations Attributable To Ensco) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Description Of The Business And Summary Of Significant Accounting Policies [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Income from continuing operations	$400.50	$390.90	$346.40	$314.20	$222.30	$348.60	$326.20	$262.50	$1,452	$1,159.60	$627.40
Income (Loss) from Continuing Operations, Portion Attributable to Noncontrolling Interest	'	'	'	'	'	'	'	'	-8.9	-7	-5.2
Income from continuing operations attributable to Ensco	'	'	'	'	'	'	'	'	$1,443.10	$1,152.60	$622.20

Description_Of_The_Business_An7

Description Of The Business And Summary Of Significant Accounting Policies (Schedule Of Income From Discontinued Operations Attributable To Ensco) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Description Of The Business And Summary Of Significant Accounting Policies [Abstract]	'	'	'	'	'	'	'	'	'	'	'
(Loss) income from discontinued operations	($36.50)	($9.50)	$16.20	$5.70	($1.10)	($3.20)	$16.50	$4.90	($24.10)	$17.10	($21.80)
Income from discontinued operations attributable to noncontrolling interests	'	'	'	'	'	'	'	'	-0.8	0	0
(Loss) income from discontinued operations attributable to Ensco	'	'	'	'	'	'	'	'	($24.90)	$17.10	($21.80)

Acquisition_Of_Pride_Internati2

Acquisition Of Pride International, Inc. (Business Acquisition, Pro Forma Information) (Details) (Pride International Inc. [Member], USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2011
Pride International Inc. [Member]	'
Business Acquisition [Line Items]	'
Revenues	$3,094.60	[1]
Net income	604.8	[1]
Earnings per share - basic (in dollars per share)	$2.61	[1]
Earnings per share - diluted (in dollars per share)	$2.60	[1]
Merger-related costs	$157.60
[1]	Supplemental pro forma earnings were adjusted to exclude an aggregate $157.6 million of merger-related costs incurred by Ensco and Pride during 2011.

Fair_Value_Measurements_Narrat

Fair Value Measurements (Narrative) (Details) (Supplemental Executive Retirement Plans [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Executive Retirement Plans [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Change in unrealized gains (losses) included in other income	$6.20	$2.80	($0.30)

Fair_Value_Measurements_Schedu

Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Supplemental executive retirement plan assets	$37.70	$29.80
Derivatives, net	1.8	5.2
Total financial assets	39.5	35
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Supplemental executive retirement plan assets	37.7	29.8
Derivatives, net	0	0
Total financial assets	37.7	29.8
Significant Other Observable Inputs (Level 2) [Member]	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Supplemental executive retirement plan assets	0	0
Derivatives, net	1.8	5.2
Total financial assets	1.8	5.2
Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Supplemental executive retirement plan assets	0	0
Derivatives, net	0	0
Total financial assets	$0	$0

Fair_Value_Measurements_Schedu1

Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) (USD $)

12 Months Ended

In Millions, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

4.70% Senior notes due 2021 [Member]

6.875% Senior notes due 2020 [Member]

3.25% Senior notes due 2016 [Member]

8.50% Senior notes due 2019 [Member]

7.875% Senior notes due 2040 [Member]

7.20% Debentures due 2027 [Member]

4.33% MARAD bonds, including current maturities, due 2016 [Member]

6.36% MARAD bonds, including current maturities, due 2015 [Member]

4.65% MARAD bonds, including current maturities, due 2020 [Member]

Carrying Value [Member]

Carrying Value [Member]

Carrying Value [Member]

Carrying Value [Member]

Carrying Value [Member]

Carrying Value [Member]

Carrying Value [Member]

Carrying Value [Member]

Carrying Value [Member]

Carrying Value [Member]

Carrying Value [Member]

Carrying Value [Member]

Carrying Value [Member]

Carrying Value [Member]

Carrying Value [Member]

Carrying Value [Member]

Carrying Value [Member]

Carrying Value [Member]

Carrying Value [Member]

Carrying Value [Member]

Estimated Fair Value [Member]

Estimated Fair Value [Member]

Estimated Fair Value [Member]

Estimated Fair Value [Member]

Estimated Fair Value [Member]

Estimated Fair Value [Member]

Estimated Fair Value [Member]

Estimated Fair Value [Member]

Estimated Fair Value [Member]

Estimated Fair Value [Member]

Estimated Fair Value [Member]

Estimated Fair Value [Member]

Estimated Fair Value [Member]

Estimated Fair Value [Member]

Estimated Fair Value [Member]

Estimated Fair Value [Member]

Estimated Fair Value [Member]

Estimated Fair Value [Member]

Estimated Fair Value [Member]

Estimated Fair Value [Member]

4.70% Senior notes due 2021 [Member]

4.70% Senior notes due 2021 [Member]

6.875% Senior notes due 2020 [Member]

6.875% Senior notes due 2020 [Member]

3.25% Senior notes due 2016 [Member]

3.25% Senior notes due 2016 [Member]

8.50% Senior notes due 2019 [Member]

8.50% Senior notes due 2019 [Member]

7.875% Senior notes due 2040 [Member]

7.875% Senior notes due 2040 [Member]

7.20% Debentures due 2027 [Member]

7.20% Debentures due 2027 [Member]

4.33% MARAD bonds, including current maturities, due 2016 [Member]

4.33% MARAD bonds, including current maturities, due 2016 [Member]

6.36% MARAD bonds, including current maturities, due 2015 [Member]

6.36% MARAD bonds, including current maturities, due 2015 [Member]

4.65% MARAD bonds, including current maturities, due 2020 [Member]

4.65% MARAD bonds, including current maturities, due 2020 [Member]

4.70% Senior notes due 2021 [Member]

4.70% Senior notes due 2021 [Member]

6.875% Senior notes due 2020 [Member]

6.875% Senior notes due 2020 [Member]

3.25% Senior notes due 2016 [Member]

3.25% Senior notes due 2016 [Member]

8.50% Senior notes due 2019 [Member]

8.50% Senior notes due 2019 [Member]

7.875% Senior notes due 2040 [Member]

7.875% Senior notes due 2040 [Member]

7.20% Debentures due 2027 [Member]

7.20% Debentures due 2027 [Member]

4.33% MARAD bonds, including current maturities, due 2016 [Member]

4.33% MARAD bonds, including current maturities, due 2016 [Member]

6.36% MARAD bonds, including current maturities, due 2015 [Member]

6.36% MARAD bonds, including current maturities, due 2015 [Member]

4.65% MARAD bonds, including current maturities, due 2020 [Member]

4.65% MARAD bonds, including current maturities, due 2020 [Member]

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt instrument

'

'

'

'

'

'

'

'

'

$4,766.40

$4,845.90

$1,477.20

$1,474.70

$1,024.80

$1,040.60

$996.50

$995.10

$600.50

$616.40

$382.60

$383.80

$149.10

$149

$78.90

$112.30

$25.30

$38

$31.50

$36

$5,096.30

$5,415.80

$1,596.90

$1,715.60

$1,086.70

$1,138.30

$1,045.80

$1,068.90

$635.80

$661.70

$410.50

$423.90

$178.60

$193.20

$79.70

$121.60

$27.10

$48.70

$35.20

$43.90

Debt instrument, interest rate, stated percentage

4.70%

6.88%

3.25%

8.50%

7.88%

7.20%

4.33%

6.36%

4.65%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt instrument maturity period

'2021

'2020

'2016

'2019

'2040

'2027

'2016

'2015

'2020

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property_And_Equipment_Narrati

Property And Equipment (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]	'	'
Property and equipment	$17,498.50	$15,737.10
Drilling rigs and equipment [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Increase in drilling rigs and equipment	2,339.60	'
Property and equipment	15,839	13,499.40
Work in progress [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Increase in drilling rigs and equipment	-590.1	'
Property and equipment	1,558.50	2,148.60
Work in progress [Member] | Jackup Rigs [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment	627.2	157.4
Work in progress [Member] | Ultra Deepwater Drillships [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment	513.4	1,100
Work in progress [Member] | Premium Jackup Rigs [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment	43.7	'
Work in progress [Member] | Ultra Deepwater Semisubmersible Rigs [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment	'	$603.90

Property_And_Equipment_Schedul

Property And Equipment (Schedule Of Property And Equipment) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'
Property and equipment	$17,498.50	$15,737.10
Drilling rigs and equipment [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment	15,839	13,499.40
Other [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment	101	89.1
Work in progress [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment	$1,558.50	$2,148.60

Debt_Narrative_Details

Debt (Narrative) (Details) (USD $)

12 Months Ended

12 Months Ended

12 Months Ended

0 Months Ended

0 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

7-May-13

Dec. 31, 2013

Mar. 31, 2013

Dec. 31, 2012

7-May-13

7-May-13

7-May-13

7-May-13

Dec. 31, 2012

Senior Notes [Member]

Commercial Paper Program [Member]

Commercial Paper Program [Member]

Debentures Due 2027 [Member]

ENSCO 7500 [Member]

ENSCO 105 [Member]

6.875% Senior notes due 2020 [Member]

6.875% Senior notes due 2020 [Member]

8.50% Senior notes due 2019 [Member]

8.50% Senior notes due 2019 [Member]

7.875% Senior notes due 2040 [Member]

7.875% Senior notes due 2040 [Member]

4.33% MARAD bonds due 2016 [Member]

4.33% MARAD bonds due 2016 [Member]

3.25% Senior notes due 2016 [Member]

3.25% Senior notes due 2016 [Member]

4.70% Senior notes due 2021 [Member]

4.70% Senior notes due 2021 [Member]

Five Year Credit Facility Member

Five Year Credit Facility Member

Five Year Credit Facility Member

Five Year Credit Facility Member

Base Rate [Member]

London Interbank Offered Rate (LIBOR) [Member]

Maximum [Member]

Three Hundred Sixty Four Day Credit Facility [Member]

Three Hundred Sixty Four Day Credit Facility [Member]

Bonds Due 2015 And 2020 [Member]

Bonds Due 2015 And 2020 [Member]

Acquired Debt [Member]

Acquired Debt [Member]

Acquired Debt [Member]

Acquired Debt [Member]

Senior Notes [Member]

Senior Notes [Member]

Five Year Credit Facility Member

Five Year Credit Facility Member

Five Year Credit Facility Member

Five Year Credit Facility Member

Five Year Credit Facility Member

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Unused Capacity, Commitment Fee Percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.13%

'

'

'

'

'

'

'

'

Unsecured debt instruments issued

'

'

'

'

'

'

$150,000,000

'

$76,500,000

'

$900,000,000

'

$500,000,000

'

$300,000,000

'

$151,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt instrument interest rate stated percentage

'

'

'

'

'

'

7.20%

6.36%

4.65%

6.88%

'

8.50%

'

7.88%

'

4.33%

'

3.25%

3.25%

4.70%

4.70%

'

'

'

'

'

'

'

'

'

Commercial paper, capacity

'

'

'

'

1,000,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Current borrowing capacity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,000,000,000

'

'

'

'

'

'

'

'

Aggregate amount of unsecured debt instrument

'

'

'

'

'

'

'

190,000,000

'

'

'

'

'

'

'

'

'

'

1,000,000,000

'

1,500,000,000

'

'

'

'

'

'

'

'

'

Discount to senior notes

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7,600,000

'

29,600,000

'

'

'

'

'

'

'

'

'

Aggregate redemption price of notes

'

'

'

100.00%

'

'

100.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of semiannual principal installments

'

'

'

'

'

'

'

30

34

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Semiannual principal installment amount

'

'

'

'

'

'

'

6,300,000

2,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Term of credit facility

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'5 years

'

'

'

'

'

'

'364 days

'

Maximum days of maturity of notes

'

'

'

'

364

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Commercial paper

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt instrument maturity term, years

'

'

'

'

'

'

'

15

17

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum amount of right to increase the commitment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,500,000,000

2,000,000,000

1,450,000,000

'

'

'

'

450,000,000

'

Maximum percentage of debt to total capitalization ratio

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

50.00%

'

'

Amounts outstanding

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

'

'

'

'

0

Basis spread on variable rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.13%

1.13%

'

'

'

Debt instrument maturity period

'

'

'

'

'

'

'

'

'

'2020

'

'2019

'

'2040

'

'2016

'

'2016

'2016

'2021

'2021

'

'

'

'

'

'

'

'

'

Weighted-average interest rate

'

'

'

'

0.35%

0.44%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net unamortized premiums

283,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest Expense

158,800,000

123,600,000

95,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Capitalized interest

$67,700,000

$105,800,000

$80,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt_Schedule_Of_LongTerm_Debt

Debt (Schedule Of Long-Term Debt Instruments) (Details) (USD $)

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

In Millions, unless otherwise specified

4.70% Senior notes due 2021 [Member]

6.875% Senior notes due 2020 [Member]

3.25% Senior notes due 2016 [Member]

8.50% Senior notes due 2019 [Member]

7.875% Senior notes due 2040 [Member]

7.20% Debentures due 2027 [Member]

4.33% MARAD bonds due 2016 [Member]

6.36% MARAD bonds due 2015 [Member]

4.65% MARAD bonds due 2020 [Member]

Reported Value Measurement [Member]

Reported Value Measurement [Member]

Reported Value Measurement [Member]

Reported Value Measurement [Member]

Reported Value Measurement [Member]

Reported Value Measurement [Member]

Reported Value Measurement [Member]

Reported Value Measurement [Member]

Reported Value Measurement [Member]

Reported Value Measurement [Member]

Reported Value Measurement [Member]

Reported Value Measurement [Member]

Reported Value Measurement [Member]

Reported Value Measurement [Member]

Reported Value Measurement [Member]

Reported Value Measurement [Member]

Reported Value Measurement [Member]

Reported Value Measurement [Member]

Reported Value Measurement [Member]

Reported Value Measurement [Member]

4.70% Senior notes due 2021 [Member]

4.70% Senior notes due 2021 [Member]

6.875% Senior notes due 2020 [Member]

6.875% Senior notes due 2020 [Member]

3.25% Senior notes due 2016 [Member]

3.25% Senior notes due 2016 [Member]

8.50% Senior notes due 2019 [Member]

8.50% Senior notes due 2019 [Member]

7.875% Senior notes due 2040 [Member]

7.875% Senior notes due 2040 [Member]

7.20% Debentures due 2027 [Member]

7.20% Debentures due 2027 [Member]

4.33% MARAD bonds due 2016 [Member]

4.33% MARAD bonds due 2016 [Member]

6.36% MARAD bonds due 2015 [Member]

6.36% MARAD bonds due 2015 [Member]

4.65% MARAD bonds due 2020 [Member]

4.65% MARAD bonds due 2020 [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Fair Value Disclosure

'

'

'

'

'

'

'

'

'

'

'

$4,766.40

$4,845.90

$1,477.20

$1,474.70

$1,024.80

$1,040.60

$996.50

$995.10

$600.50

$616.40

$382.60

$383.80

$149.10

$149

$78.90

$112.30

$25.30

$38

$31.50

$36

Total

4,766.40

4,845.90

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt, Current

-47.5

-47.5

'

'

'

'

'

'

'

12.7

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total long-term debt

$4,718.90

$4,798.40

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt instrument interest rate stated percentage

'

'

4.70%

6.88%

3.25%

8.50%

7.88%

7.20%

4.33%

6.36%

4.65%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt instrument maturity period

'

'

'2021

'2020

'2016

'2019

'2040

'2027

'2016

'2015

'2020

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt_Aggregate_Maturities_Of_L

Debt (Aggregate Maturities Of Long-Term Debt) (Details) (USD $)	Dec. 31, 2013
In Millions, unless otherwise specified
Debt Instruments [Abstract]	'
2013	$47.50
2014	47.5
2015	1,019.70
2016	4.5
2017	4.5
Thereafter	3,359
Total	$4,482.70

Derivative_Instruments_Narrati

Derivative Instruments (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'
Maximum maturity period for all derivatives	'18 months		'		'
Not Designated as Hedging Instrument [Member]	'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'
Net gains on derivatives not designated as hedging instruments	$3.60		$1.50		$0.50
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member]	'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	-2		0		5.5
Foreign Currency Derivative [Member]	'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'
Net foreign currency derivative asset (liability) included on balance sheet	1.8		5.2		'
Foreign Exchange Forward [Member] | Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member]	'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	-1.6	[1],[2]	0.5	[1],[2]	6	[1],[2]
Foreign Exchange [Member] | Cash Flow Hedges [Member]	'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'
Aggregate cash flow hedges outstanding	376.1		'		'
British pounds	175.1		'		'
Brazilian reais	110.8		'		'
Singapore dollars	35.3		'		'
Australian dollars	23.6		'		'
Euros	22.3		'		'
Other currencies	9		'		'
Foreign Exchange [Member] | Not Designated as Hedging Instrument [Member]	'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'
Aggregate cash flow hedges outstanding	208.9		'		'
British pounds	25.8		'		'
Brazilian reais	20.8		'		'
Australian dollars	16.5		'		'
Euros	97.9		'		'
Indonesian rupiah	13.9		'		'
Swiss francs	21.4		'		'
Other currencies	12.6		'		'
Contract Drilling [Member] | Foreign Exchange Forward [Member]	'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	-2.5		'		'
Depreciation Expense [Member] | Foreign Exchange Forward [Member]	'		'		'
Derivative Instruments, Gain (Loss) [Line Items]	'		'		'
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$0.90		'		'
[1]	Changes in the fair value of cash flow hedges are recorded in AOCI. Amounts recorded in AOCI associated with cash flow hedges are subsequently reclassified into contract drilling, depreciation or interest expense as earnings are affected by the underlying hedged forecasted transaction.
[2]	During the year ended DecemberB 31, 2013, $2.5 million of losses were reclassified from AOCI into contract drilling expense and $900,000 of gains were reclassified from AOCI into depreciation expense in our consolidated statement of income.

Derivative_Instruments_Schedul

Derivative Instruments (Schedule Of Derivatives At Fair Value) (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012
In Millions, unless otherwise specified
Derivative [Line Items]	'		'
Total fair value of derivative assets	$12.80		$5.70
Total fair value of derivative liabilities	11		0.5
Designated as Hedging Instrument [Member]	'		'
Derivative [Line Items]	'		'
Total fair value of derivative assets	10.3		5.5
Total fair value of derivative liabilities	10.4		0.3
Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts - Current [Member]	'		'
Derivative [Line Items]	'		'
Total fair value of derivative assets	9.1	[1]	5	[1]
Total fair value of derivative liabilities	9.8	[1]	0.3	[1]
Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts - Non-Current [Member]	'		'
Derivative [Line Items]	'		'
Total fair value of derivative assets	1.2	[2]	0.5	[2]
Total fair value of derivative liabilities	0.6	[2]	0	[2]
Not Designated as Hedging Instrument [Member]	'		'
Derivative [Line Items]	'		'
Total fair value of derivative assets	2.5		0.2
Total fair value of derivative liabilities	0.6		0.2
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Contracts - Current [Member]	'		'
Derivative [Line Items]	'		'
Total fair value of derivative assets	2.5	[1]	0.2	[1]
Total fair value of derivative liabilities	$0.60	[1]	$0.20	[1]
[1]	Derivative assets and liabilities that have maturity dates equal to or less than 12 months from the respective balance sheet dates were included in other current assets and accrued liabilities and other, respectively, on our consolidated balance sheets.
[2]	Derivative assets and liabilities that have maturity dates greater than 12 months from the respective balance sheet dates were included in other assets, net, and other liabilities, respectively, on our consolidated balance sheets.

Derivative_Instruments_Gains_A

Derivative Instruments (Gains And Losses On Derivatives Designated As Cash Flow Hedges) (Details) (Designated as Hedging Instrument [Member], Cash Flow Hedges [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Derivative [Line Items]	'		'		'
Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivatives (Effective Portion)	($5.80)		$8.70		$0.10
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	-2		0		5.5
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)	-0.3		-0.3		0.3
Interest Rate Lock Contracts [Member]	'		'		'
Derivative [Line Items]	'		'		'
Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivatives (Effective Portion)	0	[1]	0	[1]	0	[1]
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	-0.4	[1],[2]	-0.5	[1],[2]	-0.5	[1],[2]
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)	0	[1],[3]	0	[1],[3]	0	[1],[3]
Foreign Currency Forward Contracts [Member]	'		'		'
Derivative [Line Items]	'		'		'
Gain (Loss) Recognized in Other Comprehensive Income ("OCI") on Derivatives (Effective Portion)	-5.8	[4]	8.7	[4]	0.1	[4]
Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	-1.6	[2],[4]	0.5	[2],[4]	6	[2],[4]
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)	($0.30)	[3],[4]	($0.30)	[3],[4]	$0.30	[3],[4]
[1]	Losses on interest rate lock derivatives reclassified from AOCI into income (effecti
[2]	Changes in the fair value of cash flow hedges are recorded in AOCI. Amounts recorded in AOCI associated with cash flow hedges are subsequently reclassified into contract drilling, depreciation or interest expense as earnings are affected by the underlying hedged forecasted transaction.
[3]	Gains and losses recognized in income for ineffectiveness and amounts excluded from effectiveness testing were included in other, net,B in our consolidated statements of income.
[4]	During the year ended DecemberB 31, 2013, $2.5 million of losses were reclassified from AOCI into contract drilling expense and $900,000 of gains were reclassified from AOCI into depreciation expense in our consolidated statement of income.

Derivative_Instruments_Schedul1

Derivative Instruments (Schedule Of Estimated Amount Of Net Gains Associated With Derivatives) (Details) (USD $)	Dec. 31, 2013
In Millions, unless otherwise specified
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Net unrealized gains to be reclassified to contract drilling expense	($1.70)
Net realized gains to be reclassified to depreciation expense	0.9
Net realized (losses) to be reclassified to interest expense	-0.4
Net gains to be reclassified to earnings	($1.20)

Shareholders_Equity_Narrative_

Shareholders' Equity (Narrative) (Details) (USD $)	0 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013
Stockholders' Equity Note [Abstract]	'	'
Stock Repurchase Program, Authorized Amount	'	$2,000,000,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	35,000,000	35,000,000
Stock Repurchased During Period, Shares	0	'

Shareholders_Equity_Schedule_O

Shareholders' Equity (Schedule Of Activity In Our Various Shareholders' Equity) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'	'	'	'	'	'
BALANCE	'	'	'	$11,852.10	'	'	'	'	$11,852.10	'	'
Net income	364	381.4	362.6	319.9	221.2	345.4	342.7	267.4	1,427.90	1,176.70	605.6
Equity issuance and financing costs	'	'	'	'	'	'	'	'	0	-66.7	70.5
Net other comprehensive income (loss)	'	'	'	'	'	'	'	'	-1.9	11.5	-2.5
BALANCE	12,798.90	'	'	'	11,852.10	'	'	'	12,798.90	11,852.10	'
Common Stock [Member]	'	'	'	'	'	'	'	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'	'	'	'	'	'
BALANCE, shares	'	'	'	237.7	'	'	'	235.9	237.7	235.9	150.1
BALANCE	'	'	'	23.9	'	'	'	23.7	23.9	23.7	15.1
Shares issued under share-based compensation plans, net, shares	'	'	'	'	'	'	'	'	1.9	1.8	'
Shares issued under share-based compensation plans, net	'	'	'	'	'	'	'	'	0.2	0.2	'
Shares issued in connection with the Merger, shares	'	'	'	'	'	'	'	'	'	'	85.8
Shares issued in connection with the Merger	'	'	'	'	'	'	'	'	'	'	8.6
BALANCE, shares	239.6	'	'	'	237.7	'	'	'	239.6	237.7	235.9
BALANCE	24.1	'	'	'	23.9	'	'	'	24.1	23.9	23.7
Additional Paid-In Capital [Member]	'	'	'	'	'	'	'	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'	'	'	'	'	'
BALANCE	'	'	'	5,398.70	'	'	'	5,253	5,398.70	5,253	637.1
Shares issued under share-based compensation plans, net	'	'	'	'	'	'	'	'	21.8	35.3	39.7
Shares issued in connection with the Merger	'	'	'	'	'	'	'	'	'	'	4,568.90
Fair value of share options assumed in connection with the Merger	'	'	'	'	'	'	'	'	'	'	35.4
Equity issuance and financing costs	'	'	'	'	'	'	'	'	'	66.7	-70.5
Tax benefit (deficiency) from share-based compensation	'	'	'	'	'	'	'	'	0.1	-1	0.5
Share-based compensation cost	'	'	'	'	'	'	'	'	46.6	44.7	41.9
BALANCE	5,467.20	'	'	'	5,398.70	'	'	'	5,467.20	5,398.70	5,253
Retained Earnings [Member]	'	'	'	'	'	'	'	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'	'	'	'	'	'
BALANCE	'	'	'	6,434.70	'	'	'	5,613.10	6,434.70	5,613.10	5,305
Net income	'	'	'	'	'	'	'	'	1,418.20	1,169.70	600.4
Cash dividends paid	'	'	'	'	'	'	'	'	-525.6	-348.1	-292.3
BALANCE	7,327.30	'	'	'	6,434.70	'	'	'	7,327.30	6,434.70	5,613.10
AOCI [Member]	'	'	'	'	'	'	'	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'	'	'	'	'	'
BALANCE	'	'	'	20.1	'	'	'	8.6	20.1	8.6	11.1
Net other comprehensive income (loss)	'	'	'	'	'	'	'	'	-1.9	11.5	-2.5
BALANCE	18.2	'	'	'	20.1	'	'	'	18.2	20.1	8.6
Treasury Shares [Member]	'	'	'	'	'	'	'	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'	'	'	'	'	'
BALANCE	'	'	'	-31	'	'	'	-19.1	-31	-19.1	-8.8
Shares issued under share-based compensation plans, net	'	'	'	'	'	'	'	'	-0.1	-0.1	0.2
Repurchase of shares	'	'	'	'	'	'	'	'	-14.1	-11.8	-10.5
BALANCE	-45.2	'	'	'	-31	'	'	'	-45.2	-31	-19.1
Noncontrolling Interest [Member]	'	'	'	'	'	'	'	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'	'	'	'	'	'
BALANCE	'	'	'	5.7	'	'	'	5.2	5.7	5.2	5.5
Net income	'	'	'	'	'	'	'	'	9.7	7	5.2
Distributions to noncontrolling interests	'	'	'	'	'	'	'	'	-8.1	-6.5	-5.5
BALANCE	$7.30	'	'	'	$5.70	'	'	'	$7.30	$5.70	$5.20

Benefit_Plans_Narrative_Detail

Benefit Plans (Narrative) (Details) (USD $)

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2005

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

In Millions, except Share data, unless otherwise specified

Long-Term Incentive Plan (LTIP) [Member]

Non-Vested Share Awards [Member]

Non-Vested Share Awards [Member]

Non-Vested Share Awards [Member]

Share Options Award [Member]

Exercisable In Increments Over Four-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]

Savings Plan [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares reserved for issuance as awards

'

'

14,000,000

'

'

'

9,800,000

'

'

'

'

'

1,000,000

'

'

'

Share awards, vest rate

'

'

'

'

33.00%

20.00%

'

25.00%

33.00%

'

'

'

33.00%

'

'

'

Unrecognized compensation cost on awards

'

'

'

$100.50

'

'

$0.20

'

'

$8.70

'

'

'

'

'

'

Recognized compensation cost, weighted-average period, years

'

'

'

'2 years 2 months 12 days

'

'

'3 months 18 days

'

'

'1 year 9 months 18 days

'

'

'

'

'

'

Share options award, outstanding

814,000

1,346,000

'

'

'

'

814,000

'

'

'

'

'

'

'

'

'

Share option awards, exercisable, increment

'

'

'

'

'

'

'

'

'

'3 years

'

'

'3 years

'

'

'

Performance awards, granted, aggregate grant-date fair value

'

'

'

'

'

'

'

'

'

8.2

7.2

3.1

'

'

'

'

Performance awards, vested, aggregate fair value

'

'

'

'

'

'

'

'

'

7.4

5.3

5.6

'

'

'

'

Recognized compensation expense

'

'

'

'

'

'

'

'

'

6.6

9.7

6.7

'

'

'

'

Employee match

'

'

'

'

'

'

'

'

'

'

'

'

100.00%

'

'

'

Maximum percentage of eligible employee compensation to be matched by employer

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5.00%

Total matching contributions

'

'

'

'

'

'

'

'

'

'

'

'

21.1

16.5

12.8

'

Profit sharing contribution provisions

'

'

'

'

'

'

'

'

'

'

'

'

$55.30

$45.10

$21.10

'

Benefit_Plans_Summary_Of_NonVe

Benefit Plans (Summary Of Non-Vested Share Award Related Compensation Expense Recognized) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Tax benefit	($5.40)	($7)	($6.90)
Total non-vested share award related compensation expense included in net income	37.5	34.9	31.6
Contract Drilling [Member]	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Non-vested share award related compensation expense	21.3	17.1	17
General And Administrative [Member]	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Non-vested share award related compensation expense	21.6	24.8	21.5
Operating Expenses [Member]	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Non-vested share award related compensation expense	$42.90	$41.90	$38.50

Benefit_Plans_Summary_Of_Value

Benefit Plans (Summary Of Value Of Non-Vested Share Awards Granted And Vested) (Details) (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'	'	'
Weighted-average grant-date fair value of non-vested share awards granted (per share)	$59.79	$48.32	$52.50
Total fair value of non-vested share awards vested during the period (in millions)	$49.60	$42.50	$41

Benefit_Plans_Summary_Of_NonVe1

Benefit Plans (Summary Of Non-Vested Share Award Activity) (Details) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
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	2,491	'	'
Non-vested Granted, Shares	1,018	'	'
Non-vested Vested, Shares	-829	'	'
Non-vested Forfeited, Shares	-184	'	'
Non-vested as of December 31, 2012, Shares	2,496	2,491	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]	'	'	'
Non-vested as of December 31, 2011, Weighted-Average Grant-Date Fair Value	$46.52	'	'
Non-vested Granted, Weighted-Average Grant-Date Fair Value	$59.79	$48.32	$52.50
Non-vested Vested, Weighted-Average Grant-Date Fair Value	$49.96	'	'
Non-vested Forfeited, Weighted-Average Grant-Date Fair Value	$49.16	'	'
Non-vested as of December 31, 2012, Weighted-Average Grant-Date Fair Value	$52.95	$46.52	'

Benefit_Plans_Summary_Of_Optio

Benefit Plans (Summary Of Option Related Compensation Expense Recognized) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Tax benefit	($0.10)	($0.30)	($0.50)
Total option related compensation expense included in net income	0.7	1.3	2
General And Administrative [Member]	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Option related compensation expense	0.8	1.6	2.5
Operating Expenses [Member]	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Option related compensation expense	$0.80	$1.60	$2.50

Benefit_Plans_WeightedAverage_

Benefit Plans (Weighted-Average Assumptions Utilizing The Black-Scholes Model) (Details)	12 Months Ended
	Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Risk-free interest rate	1.40%
Expected term (in years)	'3 years 8 months 12 days
Expected volatility	50.20%
Dividend yield	2.60%

Benefit_Plans_Summary_Of_Optio1

Benefit Plans (Summary Of Option Activity) (Details) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]	'
Outstanding as of December 31, 2011, Shares	1,346
Granted, Shares	0
Exercised, Shares	-506
Forfeited, Shares	0
Expired, Shares	-26
Outstanding as of December 31, 2012, Shares	814
Exercisable as of December 31, 2012, Shares	780
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]	'
Outstanding as of December 31, 2011, Weighted-Average Exercise Price	$46.05
Granted, Weighted-Average Exercise Price	$0
Exercised, Weighted-Average Exercise Price	$43.96
Forfeited, Weighted-Average Exercise Price	$0
Expired, Weighted-Average Exercise Price	$51.24
Outstanding as of December 31, 2012, Weighted-Average Exercise Price	$47.18
Exercisable as of December 31, 2012, Weighted-Average Exercise Price	$46.85
Outstanding as of December 31, 2012, Weighted Average Contractual Term	'2 years 6 months
Exercisable as of December 31, 2012, Weighted-Average Contractual Term	'2 years 4 months 17 days
Outstanding as of December 31, 2012, Intrinsic Value	$9,065
Exercisable as of December 31, 2012, Intrinsic Value	$8,986

Benefit_Plans_Summary_Of_Value1

Benefit Plans (Summary Of Value Of Options Granted And Exercised) (Details) (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'	'	'
Weighted-average grant-date fair value of options granted (per share)	$0	$0	$19.05
Intrinsic value of options exercised during the year (in millions)	$8.70	$17.80	$17.20

Benefit_Plans_Summary_Of_Infor

Benefit Plans (Summary Of Information About Options Outstanding) (Details) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Options Outstanding, Number	814
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	'2 years 6 months
Options Outstanding, Weighted-Average Exercise Price	$47.18
Options Exercisable, Number	780
Options Exercisable, Weighted-Average Exercise Price	$46.85
$21.54 - $40.99 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Exercise Prices, lower range limit	$21.54
Exercise Prices, upper range limit	$40.99
Options Outstanding, Number	247
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	'3 years 1 month 6 days
Options Outstanding, Weighted-Average Exercise Price	$33.51
Options Exercisable, Number	247
Options Exercisable, Weighted-Average Exercise Price	$33.51
$41.18 - $54.30 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Exercise Prices, lower range limit	$41.18
Exercise Prices, upper range limit	$54.30
Options Outstanding, Number	229
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	'3 years 6 months
Options Outstanding, Weighted-Average Exercise Price	$43.77
Options Exercisable, Number	217
Options Exercisable, Weighted-Average Exercise Price	$43.22
$55.34 - $60.74 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Exercise Prices, lower range limit	$55.34
Exercise Prices, upper range limit	$60.74
Options Outstanding, Number	338
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	'1 year 3 months 18 days
Options Outstanding, Weighted-Average Exercise Price	$59.50
Options Exercisable, Number	316
Options Exercisable, Weighted-Average Exercise Price	$59.79

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets and Liabilities (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill [Line Items]	'	'	'
Goodwill	$3,274	$3,274	'
Drilling contract intangible assets, Gross Carrying Amount	209	209	209
Intangible Assets, Accumulated Amortization [Roll Forward]	'	'	'
Balance, beginning of period	-88.3	-36.4	'
Amortization	-42.3	-51.9	'
Balance, end of period	-130.6	-88.3	'
Intangible Assets, Net Carrying Amount [Roll Forward]	'	'	'
Balance, beginning of period	120.7	172.6	'
Amortization	-42.3	-51.9	'
Balance, end of period	78.4	120.7	'
Drilling contract intangible liabilities, Gross Carrying Amount	278	278	278
Intangible Liabilities, Accumulated Amortization [Roll Forward]	'	'	'
Balance, beginning of period	-160	-92.8	'
Amortization	-48.9	-67.2	'
Balance, end of period	-208.9	-160	'
Intangible Liabilities, Net Carrying Amount [Roll Forward]	'	'	'
Balance, beginning of period	118	185.2	'
Amortization	-48.9	-67.2	'
Balance, end of period	69.1	118	'
Finite-Lived Intangible Assets, Net, Amortization Income (Expense), Fiscal Year Maturity [Abstract]	'	'	'
2014	-4.3	'	'
2015	-4.5	'	'
2016	-0.8	'	'
2017	0.3	'	'
Total	-9.3	'	'
Floaters [Member]	'	'	'
Goodwill [Line Items]	'	'	'
Goodwill	3,081.40	'	'
Jackups [Member]	'	'	'
Goodwill [Line Items]	'	'	'
Goodwill	$192.60	'	'

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	1 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
			jackup	jackup	drillship
Income from continuing operations before income taxes in the U.S. countries	'	'	$173,400,000	$101,100,000	($24,200,000)
Income from continuing operations before income taxes in the non-U.S. countries	'	'	1,491,300,000	1,300,000,000	763,200,000
Deferred tax assets related to U.S. foreign tax credits	159,000,000	173,400,000	159,000,000	173,400,000	'
Deferred tax assets related to net operating loss carryforwards	104,000,000	87,800,000	104,000,000	87,800,000	'
Net operating loss carryforwards	375,600,000	'	375,600,000	'	'
Operating loss carryforwards, Not subject to expiration	231,400,000	'	231,400,000	'	'
Operating loss carryforwards, Subject to expiration	144,200,000	'	144,200,000	'	'
Valuation allowance on NOL carryforwards and FTC	228,800,000	'	228,800,000	'	'
Restructuring charges, tax	'	51,200,000	'	'	'
Proceeds from Income Tax Refunds	'	'	9,600,000	'	'
Valuation Allowance, Deferred Tax Asset, Change in Amount	7,000,000	'	'	'	'
Consilidated effective income tax rate excluding discrete items	'	'	12.50%	12.30%	13.00%
Minimum percentage threshold for recognition of tax benefits	'	'	50.00%	'	'
Total unrecognized tax benefits	151,700,000	110,700,000	151,700,000	110,700,000	53,600,000
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions With Net Operating Loss Carryforwards	'	'	21,000,000	'	'
Amount of unrecognized tax benefits affecting the consolidated effective income tax rate if recognized	127,400,000	'	127,400,000	'	'
Amount of accrued interest and penalties included in other liabilities	17,300,000	18,900,000	17,300,000	18,900,000	'
Amount of interest and penalties recognized in net tax expense	'	'	1,600,000	2,800,000	400,000
Income tax benefits, inclusive of interest and penalties due to lapses in statute of limitations	3,100,000	28,600,000	3,100,000	28,600,000	4,200,000
Decline in unrecognized tax benefits during next twelve months	2,300,000	'	2,300,000	'	'
Accrued interest and penalty assessments related to the decline in unrecognized tax benefits	900,000	'	900,000	'	'
Number of assets transferred (in drillships or jackups)	'	'	2	1	5
Income tax liability from gain on intercompany transfers	0	3,300,000	0	3,300,000	10,300,000
Deferred tax effects of reversing temporary differences from selling subsidiaries	'	'	'	'	29,600,000
Unamortized deferred charges related to intercompany transfers	50,200,000	58,300,000	50,200,000	58,300,000	'
Amount included in current income taxes for amortization of deferred income taxes related to intercompany transfers	'	'	4,100,000	9,100,000	9,700,000
Deferred tax liability related to temporary difference from transferred drilling rigs	29,200,000	32,200,000	29,200,000	32,200,000	'
Tax benefits included in deferred income tax expense related to amortization of deferred reversing temporary differences from intercompany transfers	'	'	2,400,000	3,400,000	3,800,000
Aggregate Indefinitely reinvested undistributed subsidiary earnings.	'	530,000,000	'	'	'
Undistributed Earnings of Foreign Subsidiaries	2,100,000,000	'	2,100,000,000	'	'
Other Liabilities [Member]	'	'	'	'	'
Total unrecognized tax benefits	130,700,000	'	130,700,000	'	'
Minimum [Member]	'	'	'	'	'
Operating loss carryforwards tax credits expiration year	'	'	'2017	'	'
Remaining useful life of drilling rigs associated with amortization of deferred income tax expense, minimum years	'	'	'15 years	'	'
Maximum [Member]	'	'	'	'	'
Operating loss carryforwards tax credits expiration year	'	'	'2023	'	'
Remaining useful life of drilling rigs associated with amortization of deferred income tax expense, minimum years	'	'	'35 years	'	'
Mexican Tax Authority [Member]	'	'	'	'	'
Deferred Tax Liabilities, Gross	'	'	7,400,000	'	'
Proceeds from Income Tax Refunds	'	'	$30,600,000	'	'

Income_Taxes_Summary_Of_Compon

Income Taxes (Summary Of Components Of Provision For Income Taxes From Continuing Operations) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Current income tax expense, U.S.	'	'	'	'	'	'	'	'	$94.20	$45	$36.40
Current income tax expense, Non-U.S.	'	'	'	'	'	'	'	'	107.3	166	88.3
Current Income Tax Expense, Total	'	'	'	'	'	'	'	'	201.5	211	124.7
Deferred income tax expense (benefit), U.S.	'	'	'	'	'	'	'	'	19.8	29.6	-9.7
Deferred income tax expense (benefit), Non-U.S.	'	'	'	'	'	'	'	'	-8.6	-2.5	-3.4
Deferred income tax expense	'	'	'	'	'	'	'	'	11.2	27.1	-13.1
Total provision for income taxes	$48	$65.40	$48.50	$50.80	$120.60	$44.30	$40.40	$32.80	$212.70	$238.10	$111.60

Income_Taxes_Summary_Of_Signif

Income Taxes (Summary Of Significant Components Of Deferred Income Tax Assets (Liabilities)) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Effective Income Tax Rate Reconciliation, Amount [Abstract]	'	'
Foreign tax credits	$159	$173.40
Premium on long-term debt	111.9	124
Net operating loss carryfowards	104	87.8
Employee benefits, including share-based compensation	41.7	33.4
Deferred revenue	19.4	22.7
Other	19.8	24.5
Total deferred tax assets	455.8	465.8
Valuation allowance	-232.6	-227.1
Net deferred tax assets	223.2	238.7
Property and equipment	-453.6	-472.9
Intercompany transfers of property	-29.2	-32.2
Deferred costs	-11.4	-20.9
Other	-24	-31.3
Total deferred tax liabilities	-518.2	-557.3
Net deferred tax liability	-295	-318.6
Net current deferred tax asset	20.9	13.8
Net noncurrent deferred tax liability	($315.90)	($332.40)

Income_Taxes_Summary_Of_Effect

Income Taxes (Summary Of Effective Income Tax Rate On Continuing Operations) (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]	'	'	'
U.K. statutory income tax rate	23.30%	24.50%	26.50%
Non-U.K. taxes	-13.70%	-17.30%	-18.10%
Amortization of deferred charges associated with intercompany rig sales	0.10%	0.40%	0.80%
Redomestication related income taxes	0.00%	3.70%	0.00%
Valuation allowance	1.90%	4.80%	4.70%
Net expense (benefit) in connection with resolutions of tax issues and adjustments relating to prior years	0.60%	1.00%	0.80%
Other	0.60%	-0.10%	0.40%
Effective income tax rate	12.80%	17.00%	15.10%

Income_Taxes_Summary_Of_Reconc

Income Taxes (Summary Of Reconciliation Of The Beginning And Ending Amount Of Unrecognized Tax Benefits) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]	'	'
Balance, beginning of year	$110.70	$53.60
Increases in unrecognized tax benefits as a result of tax positions taken during prior years	35.8	21.3
Increases in unrecognized tax benefits as a result of tax positions taken during the current year	10	60.7
Decreases in unrecognized tax benefits as a result of tax positions taken during prior years	-3.7	-0.4
Settlements with taxing authorities	0	-4.1
Lapse of applicable statutes of limitations	-1.1	-20.8
Impact of foreign currency exchange rates	0	0.4
Balance, end of year	$151.70	$110.70

Discontinued_Operations_Schedu

Discontinued Operations (Schedule of Rig Sales) (Details) (USD $)

12 Months Ended

31 Months Ended

12 Months Ended

1 Months Ended

In Millions, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Mar. 31, 2013

Oct. 31, 2012

Jun. 30, 2012

31-May-12

Jun. 30, 2011

Sep. 30, 2012

Floaters [Member]

Jackups [Member]

Jackups [Member]

Jackups [Member]

Jackups [Member]

Jackups [Member]

Other [Member]

ENSCO 5003 [Member]

Pride Pennsylvania Rig [Member]

Pride Hawaii [Member]

ENSCO 61 [Member]

ENSCO 59 [Member]

ENSCO 95 [Member]

ENSCO I [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net Proceeds

$131.60

$173.10

($79.80)

$203

[1]

$68.20

[1]

$15.50

[1]

$18.80

[1]

$31.70

[1]

$22.80

[1]

$41.50

[1]

$4.50

[1]

Net Book Value

204.5

[1],[2]

'

'

204.5

[1],[2]

89.4

[1],[2]

15.7

[1],[2]

16.8

[1],[2]

19.6

[1],[2]

21.9

[1],[2]

28.8

[1],[2]

12.3

[1],[2]

Pre-tax Gain/(Loss)

'

'

'

($1.50)

[1],[3]

($21.20)

($0.20)

$2

$12.10

$0.90

$12.70

($7.80)

[1]

The rigs' operating results were reclassified to discontinued operations in our consolidated statements of income for each of the years in the three-year period ended DecemberB 31, 2013 and were previously included within the operating segment noted in the above table.

[2]

Includes the rig's net book value as well as inventory and other assets on the date of the sale.

[3]

The pre-tax (loss)/gain was included in loss from discontinued operations, net in our consolidated statement of income in the year of sale. Income tax expense of $900,000 and $10.9 million was recognized in connection with the sale of assets during the years ended December 31, 2013 and December 31, 2011, respectively. There was no net income tax expense recognized in connection with the sale of assets during the year ended December 31, 2012.

Discontinued_Operations_Narrat

Discontinued Operations (Narrative) (Details) (USD $)

12 Months Ended

31 Months Ended

12 Months Ended

3 Months Ended

1 Months Ended

3 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Jun. 30, 2014

Mar. 31, 2013

Apr. 30, 2014

Dec. 31, 2013

Pride Pennsylvania Rig [Member]

6.36% MARAD bonds due 2015 [Member]

Jackups [Member]

Jackups [Member]

Subsequent Event [Member]

Subsequent Event [Member]

ENSCO 85 [Member]

Pride Pennsylvania Rig [Member]

Jackups [Member]

Jackups [Member]

ENSCO 85 [Member]

ENSCO 69 and Wisconsin [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

'

'

'

'

'

'

'

'

'

'

Discontinued Operation, Tax Effect of Discontinued Operation

$900,000

'

$10,900,000

'

'

'

'

'

'

'

Debt instrument, interest rate, stated percentage

'

'

'

'

'

6.36%

'

'

'

'

Debt Instrument Carrying Value

'

'

'

'

'

25,300,000

'

'

'

'

Debt, Current

-47,500,000

-47,500,000

'

-47,500,000

'

12,700,000

'

'

'

'

Net Cash Provided by (Used in) Discontinued Operations

131,600,000

173,100,000

-79,800,000

203,000,000

[1]

'

'

64,400,000

15,500,000

[1]

64,400,000

32,200,000

[1]

Impairment charge for asset write down

'

'

'

'

-2,500,000

'

'

'

'

'

Litigation Settlement, Amount

9,600,000

'

'

'

'

'

'

'

'

'

Legal Fees

3,600,000

'

'

'

'

'

'

'

'

'

Estimated Litigation Liability

6,400,000

'

'

6,400,000

'

'

'

'

'

'

Liability insurance self-insured retention per occurrence

10,000,000

'

'

10,000,000

'

'

'

'

'

'

Litigation Settlement, Amount to be Paid by Underwriters

$3,200,000

'

'

$3,200,000

'

'

'

'

'

'

[1]

The rigs' operating results were reclassified to discontinued operations in our consolidated statements of income for each of the years in the three-year period ended DecemberB 31, 2013 and were previously included within the operating segment noted in the above table.

Discontinued_Operations_Summar

Discontinued Operations (Summary Of Income From Discontinued Operations) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Discontinued Operations and Disposal Groups [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	$399.90	$438.20	$243.50
Operating expenses	'	'	'	'	'	'	'	'	412.6	406.9	258.7
Operating (loss) income before income taxes	'	'	'	'	'	'	'	'	-12.7	31.3	-15.2
Other income (expense)	'	'	'	'	'	'	'	'	0.3	1.3	0.2
Income tax benefit	'	'	'	'	'	'	'	'	-10.6	1	-8.6
Gain on disposal of discontinued operations, net	'	'	'	'	'	'	'	'	-1.1	-16.5	1.8
DISCONTINUED OPERATIONS, NET	($36.50)	($9.50)	$16.20	$5.70	($1.10)	($3.20)	$16.50	$4.90	($24.10)	$17.10	($21.80)

Commitments_And_Contingencies_1

Commitments And Contingencies (Narrative) (Details) (USD $)	1 Months Ended	12 Months Ended			24 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Mar. 31, 2009
	plaintiffs	occurrence	payments		claim	mi
	claim	claim			plaintiffs
		plaintiffs
Oil and Gas Delivery Commitments and Contracts [Line Items]	'	'	'	'	'	'
Aggregate Contractual Capital Commitments Due In One Year	$1,061.40	$1,061.40	'	'	$1,061.40	'
Rental expenses	'	53.6	47.5	31.5	'	'
2014	36.9	36.9	'	'	36.9	'
2015	20.1	20.1	'	'	20.1	'
2016	10.3	10.3	'	'	10.3	'
2017	9.5	9.5	'	'	9.5	'
2018	9.6	9.6	'	'	9.6	'
Thereafter	63.7	63.7	'	'	63.7	'
Distance from original drilling location in miles	'	'	'	'	'	95
Leg and debris removal costs	'	'	19	'	'	'
Number of payments related to leg and debris removal costs	'	'	9	'	'	'
Payments for leg and debris removal	'	'	'	'	19	'
Insurance reimbursements	'	'	'	'	18.5	'
Wreckage and debris removal	0	0	9	'	0	'
Wreckage and debris removal receivables	0.5	0.5	13.2	'	0.5	'
Number of claims	3	3	'	'	3	'
Liability insurance self-insured retention per occurrence	10	10	'	'	10	'
Annual liability coverage limit for wreckage and debris removal costs	'	490	'	'	'	'
Civil litigation claim damages for cost of repairs and business interruption due to pipeline rupture	26	26	'	'	26	'
Litigation Settlement, Amount	'	9.6	'	'	'	'
Legal Fees	'	3.6	'	'	'	'
Estimated Litigation Liability	6.4	6.4	'	'	6.4	'
Litigation Settlement, Amount to be Paid by Underwriters	3.2	3.2	'	'	3.2	'
Liability insurance self-insured retention	15	15	'	'	15	'
Number of occurrences	'	2	'	'	'	'
Liability insurance self-insured retention for each occurrence thereafter	'	1	'	'	'	'
Number of plaintiffs	100	100	'	'	100	'
Loss Contingency, Claims Settled, Number	58	'	'	'	'	'
Letters of Credit Outstanding, Amount	232.3	232.3	'	'	232.3	'
Minimum [Member]	'	'	'	'	'	'
Oil and Gas Delivery Commitments and Contracts [Line Items]	'	'	'	'	'	'
Damages sought	'	5	'	'	'	'
Rig Enhancement Projects [Member]	'	'	'	'	'	'
Oil and Gas Delivery Commitments and Contracts [Line Items]	'	'	'	'	'	'
Aggregate Contractual Capital Commitments Due In One Year	$94.20	$94.20	'	'	$94.20	'

Commitments_And_Contingencies_2

Commitments And Contingencies (Capital Commitments) (Details) (USD $)	Dec. 31, 2013
In Millions, unless otherwise specified
Property, Plant and Equipment [Line Items]	'
Cumulative Paid	$565.30	[1]
2014	1,061.40
2015	473.5
2016	213.8
Total	2,314	[2]
ENSCO DS-8 [Member]	'
Property, Plant and Equipment [Line Items]	'
Cumulative Paid	161.4	[1]
2014	383.2
2015	0
2016	0
Total	544.6	[2]
ENSCO DS-9 [Member]	'
Property, Plant and Equipment [Line Items]	'
Cumulative Paid	157.4	[1]
2014	373.2
2015	0
2016	0
Total	530.6	[2]
ENSCO DS-10 [Member]	'
Property, Plant and Equipment [Line Items]	'
Cumulative Paid	103	[1]
2014	103
2015	307.4
2016	0
Total	513.4	[2]
ENSCO 110 [Member]	'
Property, Plant and Equipment [Line Items]	'
Cumulative Paid	41	[1]
2014	0
2015	166.1
2016	0
Total	207.1	[2]
ENSCO 122 [Member]	'
Property, Plant and Equipment [Line Items]	'
Cumulative Paid	49	[1]
2014	202
2015	0
2016	0
Total	251	[2]
ENSCO 123 [Member]	'
Property, Plant and Equipment [Line Items]	'
Cumulative Paid	53.5	[1]
2014	0
2015	0
2016	213.8
Total	$267.30
[1]	Cumulative paid represents the aggregate amount of contractual payments made from commencement of the construction agreement through DecemberB 31, 2013.
[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.

Segment_Information_Narrative_

Segment Information (Narrative) (Details)	12 Months Ended
	Dec. 31, 2013
	service
	segments
	contract
Segment Reporting Information [Line Items]	'
Number of operating segments	3
Number of reportable segments	2
Number of services	1
Number of drilling management contracts	2
Moored Semisubmersible Rigs [Member]	'
Segment Reporting Information [Line Items]	'
Number of contract drilling rigs	'6
Jackup Rigs [Member]	'
Segment Reporting Information [Line Items]	'
Number of contract drilling rigs	'45
Floaters [Member]	'
Segment Reporting Information [Line Items]	'
Number of drillships	7
Floaters [Member] | Dynamically Positioned Semisubmersible [Member]	'
Segment Reporting Information [Line Items]	'
Number of contract drilling rigs	'13
Floaters [Member] | Moored Semisubmersible Rigs [Member]	'
Segment Reporting Information [Line Items]	'
Number of contract drilling rigs	'6
Floaters [Member] | Ultra-Deepwater [Member]	'
Segment Reporting Information [Line Items]	'
Number of contract drilling rigs	'3
Jackups [Member] | Jackup Rigs [Member]	'
Segment Reporting Information [Line Items]	'
Number of contract drilling rigs	'47
Asia Pacific, Europe and Mediterranean, Middle East and Africa and North and South America [Member] | Jackups [Member] | Jackup Rigs [Member]	'
Segment Reporting Information [Line Items]	'
Number of contract drilling rigs	'44
Singapore [Member] | Jackups [Member] | Jackup Rigs [Member]	'
Segment Reporting Information [Line Items]	'
Number of contract drilling rigs	'3

Segment_Information_Schedule_O

Segment Information (Schedule Of Segment Reporting Information) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenues	$1,187.10	$1,162.20	$1,130.30	$1,040.30	$973.10	$1,013.90	$965.70	$916.50	$4,519.90	$3,869.20	$2,599.20
Operating expenses - Contract drilling (exclusive of depreciation)	538.8	534.3	527.2	479.8	450.5	434.1	423.4	439.9	2,080.10	1,747.90	1,286.10
Depreciation	135.7	132.6	132	127.9	123	121.2	115.5	116.4	528.2	476.1	357.6
General and administrative	35.2	37.4	36.4	37.8	35	40.2	35.5	38.2	146.8	148.9	158.6
OPERATING INCOME	477.4	457.9	434.7	394.8	364.6	418.4	391.3	322	1,764.80	1,496.30	796.9
Property and equipment, net	14,311	'	'	'	13,145.60	'	'	'	14,311	13,145.60	12,421.90
Capital expenditures	'	'	'	'	'	'	'	'	1,768.50	1,715	645.7
Floaters [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	2,760.80	2,300.80	1,352.60
Operating expenses - Contract drilling (exclusive of depreciation)	'	'	'	'	'	'	'	'	1,209.70	956	630.2
Depreciation	'	'	'	'	'	'	'	'	364.8	305.7	189.1
General and administrative	'	'	'	'	'	'	'	'	0	0	0
OPERATING INCOME	'	'	'	'	'	'	'	'	1,186.30	1,039.10	533.3
Property and equipment, net	11,303.40	'	'	'	10,727.60	'	'	'	11,303.40	10,727.60	9,923.60
Capital expenditures	'	'	'	'	'	'	'	'	1,031.30	1,520.10	355.4
Jackup [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	1,684	1,485.60	1,194.20
Operating expenses - Contract drilling (exclusive of depreciation)	'	'	'	'	'	'	'	'	811.9	730.8	613
Depreciation	'	'	'	'	'	'	'	'	156.9	161.5	164.1
General and administrative	'	'	'	'	'	'	'	'	0	0	0
OPERATING INCOME	'	'	'	'	'	'	'	'	715.2	593.3	417.1
Property and equipment, net	2,961.60	'	'	'	2,389.80	'	'	'	2,961.60	2,389.80	2,462.40
Capital expenditures	'	'	'	'	'	'	'	'	710.6	192.2	276.3
Other [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	75.1	82.8	52.4
Operating expenses - Contract drilling (exclusive of depreciation)	'	'	'	'	'	'	'	'	58.5	61.1	42.9
Depreciation	'	'	'	'	'	'	'	'	0	0	0
General and administrative	'	'	'	'	'	'	'	'	0	0	0
OPERATING INCOME	'	'	'	'	'	'	'	'	16.6	21.7	9.5
Property and equipment, net	0	'	'	'	0	'	'	'	0	0	12.8
Capital expenditures	'	'	'	'	'	'	'	'	0	0	0
Operating Segments Total [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	4,519.90	3,869.20	2,599.20
Operating expenses - Contract drilling (exclusive of depreciation)	'	'	'	'	'	'	'	'	2,080.10	1,747.90	1,286.10
Depreciation	'	'	'	'	'	'	'	'	521.7	467.2	353.2
General and administrative	'	'	'	'	'	'	'	'	0	0	0
OPERATING INCOME	'	'	'	'	'	'	'	'	1,918.10	1,654.10	959.9
Property and equipment, net	14,265	'	'	'	13,117.40	'	'	'	14,265	13,117.40	12,398.80
Capital expenditures	'	'	'	'	'	'	'	'	1,741.90	1,712.30	631.7
Reconciling Items [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	0	0	0
Operating expenses - Contract drilling (exclusive of depreciation)	'	'	'	'	'	'	'	'	0	0	0
Depreciation	'	'	'	'	'	'	'	'	6.5	8.9	4.4
General and administrative	'	'	'	'	'	'	'	'	146.8	148.9	158.6
OPERATING INCOME	'	'	'	'	'	'	'	'	-153.3	-157.8	-163
Property and equipment, net	46	'	'	'	28.2	'	'	'	46	28.2	23.1
Capital expenditures	'	'	'	'	'	'	'	'	$26.60	$2.70	$14

Segment_Information_Schedule_O1

Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details)	Dec. 31, 2013
	contract
	rigs
Segment Reporting Information [Line Items]	'
Total number of contract drilling rigs	76	[1],[2]
Number of drilling management contracts	2
Floaters [Member]	'
Segment Reporting Information [Line Items]	'
Total number of contract drilling rigs	29	[2]
Jackups [Member]	'
Segment Reporting Information [Line Items]	'
Total number of contract drilling rigs	47	[2]
North & South America (Excluding Brazil) [Member]	'
Segment Reporting Information [Line Items]	'
Total number of contract drilling rigs	22	[1],[2]
North & South America (Excluding Brazil) [Member] | Floaters [Member]	'
Segment Reporting Information [Line Items]	'
Total number of contract drilling rigs	8	[2]
North & South America (Excluding Brazil) [Member] | Jackups [Member]	'
Segment Reporting Information [Line Items]	'
Total number of contract drilling rigs	14	[2]
Middle East & Africa [Member]	'
Segment Reporting Information [Line Items]	'
Total number of contract drilling rigs	16	[1],[2]
Middle East & Africa [Member] | Floaters [Member]	'
Segment Reporting Information [Line Items]	'
Total number of contract drilling rigs	6	[2]
Middle East & Africa [Member] | Jackups [Member]	'
Segment Reporting Information [Line Items]	'
Total number of contract drilling rigs	10	[2]
Asia & Pacific Rim [Member]	'
Segment Reporting Information [Line Items]	'
Total number of contract drilling rigs	13	[1],[2]
Asia & Pacific Rim [Member] | Floaters [Member]	'
Segment Reporting Information [Line Items]	'
Total number of contract drilling rigs	3	[2]
Asia & Pacific Rim [Member] | Jackups [Member]	'
Segment Reporting Information [Line Items]	'
Total number of contract drilling rigs	10	[2]
Europe & Mediterranean [Member]	'
Segment Reporting Information [Line Items]	'
Total number of contract drilling rigs	12	[1],[2]
Europe & Mediterranean [Member] | Floaters [Member]	'
Segment Reporting Information [Line Items]	'
Total number of contract drilling rigs	2	[2]
Europe & Mediterranean [Member] | Jackups [Member]	'
Segment Reporting Information [Line Items]	'
Total number of contract drilling rigs	10	[2]
BRAZIL	'
Segment Reporting Information [Line Items]	'
Total number of contract drilling rigs	7	[1],[2]
BRAZIL | Floaters [Member]	'
Segment Reporting Information [Line Items]	'
Total number of contract drilling rigs	7	[2]
BRAZIL | Jackups [Member]	'
Segment Reporting Information [Line Items]	'
Total number of contract drilling rigs	0	[2]
Asia & Pacific Rim (Under Construction) [Member]	'
Segment Reporting Information [Line Items]	'
Total number of contract drilling rigs	6	[1],[2]
Asia & Pacific Rim (Under Construction) [Member] | Floaters [Member]	'
Segment Reporting Information [Line Items]	'
Total number of contract drilling rigs	3	[2]
Asia & Pacific Rim (Under Construction) [Member] | Jackups [Member]	'
Segment Reporting Information [Line Items]	'
Total number of contract drilling rigs	3	[2]
[1]	WeB provide management services on two rigs owned by third-partiesB notB included in theB table above.
[2]	The table above includes the five floaters classified as "held for sale" as of June 30, 2014, as well as ENSCO 69, Pride Wisconsin and ENSCO 85 which were sold during 2014.

Segment_Information_Schedule_O2

Segment Information (Schedule Of Revenues And Long-Lived Assets By Geographical Segment) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenues	$1,187.10	$1,162.20	$1,130.30	$1,040.30	$973.10	$1,013.90	$965.70	$916.50	$4,519.90	$3,869.20	$2,599.20
Long-lived Assets	14,311	'	'	'	13,145.60	'	'	'	14,311	13,145.60	12,421.90
Geographic Areas [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	4,519.90	3,869.20	2,599.20
Long-lived Assets	14,311	'	'	'	13,145.60	'	'	'	14,311	13,145.60	12,421.90
Geographic Areas [Member] | United States [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	1,724.90	1,291.30	753.8
Long-lived Assets	4,617.80	'	'	'	4,525.90	'	'	'	4,617.80	4,525.90	3,450.60
Geographic Areas [Member] | Brazil [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	683.7	776.3	430.9
Long-lived Assets	2,447.50	'	'	'	2,911.30	'	'	'	2,447.50	2,911.30	3,101.80
Geographic Areas [Member] | Angola [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	467.1	341.6	209.5
Long-lived Assets	2,543.70	'	'	'	2,147.20	'	'	'	2,543.70	2,147.20	1,347.90
Geographic Areas [Member] | Other countries [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	1,644.20	1,460	1,205
Long-lived Assets	$4,702	'	'	'	$3,561.20	'	'	'	$4,702	$3,561.20	$4,521.60

Supplemental_Financial_Informa2

Supplemental Financial Information (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Capitalized interest	$67.70	$105.80	$80.20
Capital expenditure accruals	113.9	111.1	303.7
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | Floaters [Member]	'	'	'
Revenues	604.8	788.2	364.5
Percentage of consolidated revenues	13.00%	20.00%	14.00%
Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] | U.S. Gulf of Mexico [Member]	'	'	'
Revenues	1,700	'	'
Percentage of consolidated revenues	38.00%	'	'
Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] | Brazil [Member]	'	'	'
Revenues	683.7	'	'
Percentage of consolidated revenues	15.00%	'	'
Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] | Angola [Member]	'	'	'
Revenues	467.1	'	'
Percentage of consolidated revenues	10.00%	'	'
Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] | Floaters [Member] | U.S. Gulf of Mexico [Member]	'	'	'
Percentage of consolidated revenues	75.00%	'	'
OGX PetrC3leo e GC!s ParticipaC'C5es S.A. [Member]	'	'	'
Provision for Doubtful Accounts	$14.20	'	'

Supplemental_Financial_Informa3

Supplemental Financial Information (Accounts Receivable, Net) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]	'	'
Accounts receivable	$884.10	$830.60
Allowance for doubtful accounts	-28.4	-19.2
Accounts receivable, net	855.7	811.4
Trade [Member]	'	'
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]	'	'
Accounts receivable	869.8	812.4
Other [Member]	'	'
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]	'	'
Accounts receivable	$14.30	$18.20

Supplemental_Financial_Informa4

Supplemental Financial Information (Other Current Assets) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Supplemental Financial Information [Abstract]	'	'
Inventory	$256.40	$207.80
Prepaid taxes	88.1	62.2
Short-term investments	50	50
Deferred mobilization costs	47.4	46.9
Prepaid expenses	18.5	20.3
Derivative assets	11.6	5.2
Deferred tax assets	23.1	14.6
Assets held for sale	8.6	14.2
Other	10.2	4.2
Other current assets	$513.90	$425.40

Supplemental_Financial_Informa5

Supplemental Financial Information (Other Assets, Net) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Supplemental Financial Information [Abstract]	'	'
Intangible assets	$83.80	$143.30
Unbilled reimbursable receivables	51.9	77.1
Prepaid taxes on intercompany transfers of property	50.2	58.3
Warranty and Other Claim Receivables	30.6	30.6
Supplemental executive retirement plan assets	37.7	29.8
Deferred mobilization costs	59.1	45.2
Deferred tax assets	25.2	19.3
Wreckage and debris removal receivables	0.5	13.2
Other	13.7	5
Other assets, net	$352.70	$421.80

Supplemental_Financial_Informa6

Supplemental Financial Information (Accrued Liabilities And Other) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Supplemental Financial Information [Abstract]	'	'
Personnel costs	$242	$231.10
Deferred revenue	169.8	146.9
Taxes	84.2	86.9
Accrued interest	68	67.9
Prepayment Liability for Sale of Assets, Current	33	0
Customer Prepayments, Current	20	0
Wreckage and debris removal	0	9
Other	41.7	42.6
Accrued liabilities and other	$658.70	$584.40

Supplemental_Financial_Informa7

Supplemental Financial Information (Other Liabilities) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Supplemental Financial Information [Abstract]	'	'
Deferred revenue	$217.60	$224.50
Intangible liabilities	69.1	118
Unrecognized tax benefits (inclusive of interest and penalties)	148	129.6
Supplemental executive retirement plan liabilities	40.5	33.3
Personnel costs	37.2	31.6
Other	33.3	36.4
Other liabilities	$545.70	$573.40

Supplemental_Financial_Informa8

Supplemental Financial Information (Accumulated Other Comprehensive Income) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Supplemental Financial Information [Abstract]	'	'
Derivative Instruments	$20.60	$24.40
Other	-2.4	-4.3
Accumulated other comprehensive income	$18.20	$20.10

Supplemental_Financial_Informa9

Supplemental Financial Information (Repair And Maintenance Expense Related To Continuing Operations) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Financial Information [Abstract]	'	'	'
Repair and maintenance expense	$311.70	$294.70	$223.60

Recovered_Sheet1

Supplemental Financial Information (Cash Flows Information) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Financial Information [Abstract]	'	'	'
(Increase) decrease in other assets	($98.40)	$68.30	$6.70
(Decrease) increase in liabilities	-10.6	312	-33.9
(Increase) decrease in accounts receivable	-29.3	46.1	-215.9
Changes in operating assets and liabilities	$138.30	($426.40)	$243.10

Recovered_Sheet2

Supplemental Financial Information (Cash Paid For Interest And Income Taxes) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Financial Information [Abstract]	'	'	'
Interest, net of amounts capitalized	$182.20	$150.70	$28.60
Income taxes	$203.90	$88.10	$113.70

Guarantee_Of_Registered_Securi2

Guarantee Of Registered Securities (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013
Guarantor Obligations [Line Items]	'
Senior notes aggregate outstanding principal balance	1,700,000,000
8.50% Senior Notes Due 2019 [Member]	'
Guarantor Obligations [Line Items]	'
Senior note, maturity year	'2019
Debt instrument interest rate stated percentage	8.50%
6.875% Senior notes due 2020 [Member]	'
Guarantor Obligations [Line Items]	'
Senior note, maturity year	'2020
Debt instrument interest rate stated percentage	6.88%
7.875% Senior Notes Due 2040 [Member]	'
Guarantor Obligations [Line Items]	'
Senior note, maturity year	'2040
Debt instrument interest rate stated percentage	7.88%
7.20% Debentures due 2027 [Member]	'
Guarantor Obligations [Line Items]	'
Senior note, maturity year	'2027
Debt instrument interest rate stated percentage	7.20%
Notes Issued	150,000,000

Guarantee_Of_Registered_Securi3

Guarantee Of Registered Securities (Condensed Consolidating Statements Of Income) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Guarantor Obligations [Line Items]	'	'	'	'	'	'	'	'	'	'	'
OPERATING REVENUES	$1,187.10	$1,162.20	$1,130.30	$1,040.30	$973.10	$1,013.90	$965.70	$916.50	$4,519.90	$3,869.20	$2,599.20
Contract drilling (exclusive of depreciation)	538.8	534.3	527.2	479.8	450.5	434.1	423.4	439.9	2,080.10	1,747.90	1,286.10
Depreciation	135.7	132.6	132	127.9	123	121.2	115.5	116.4	528.2	476.1	357.6
General and administrative	35.2	37.4	36.4	37.8	35	40.2	35.5	38.2	146.8	148.9	158.6
OPERATING INCOME	477.4	457.9	434.7	394.8	364.6	418.4	391.3	322	1,764.80	1,496.30	796.9
OTHER (EXPENSE) INCOME, NET	-28.9	-1.6	-39.8	-29.8	-21.7	-25.5	-24.7	-26.7	-100.1	-98.6	-57.9
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	448.5	456.3	394.9	365	342.9	392.9	366.6	295.3	1,664.70	1,397.70	739
INCOME TAX PROVISION	48	65.4	48.5	50.8	120.6	44.3	40.4	32.8	212.7	238.1	111.6
DISCONTINUED OPERATIONS, NET	-36.5	-9.5	16.2	5.7	-1.1	-3.2	16.5	4.9	-24.1	17.1	-21.8
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	'	'	'	'	'	'	'	'	0	0	0
NET INCOME	364	381.4	362.6	319.9	221.2	345.4	342.7	267.4	1,427.90	1,176.70	605.6
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	-2.6	-2.6	-1.7	-2.8	-1.7	-1.9	-1.4	-2	-9.7	-7	-5.2
NET INCOME ATTRIBUTABLE TO ENSCO	361.4	378.8	360.9	317.1	219.5	343.5	341.3	265.4	1,418.20	1,169.70	600.4
Ensco Plc [Member]	'	'	'	'	'	'	'	'	'	'	'
Guarantor Obligations [Line Items]	'	'	'	'	'	'	'	'	'	'	'
OPERATING REVENUES	'	'	'	'	'	'	'	'	35	44	0
Contract drilling (exclusive of depreciation)	'	'	'	'	'	'	'	'	27.5	51.2	46.9
Depreciation	'	'	'	'	'	'	'	'	0.3	0.4	0.4
General and administrative	'	'	'	'	'	'	'	'	63.5	63.8	52.2
OPERATING INCOME	'	'	'	'	'	'	'	'	-56.3	-71.4	-99.5
OTHER (EXPENSE) INCOME, NET	'	'	'	'	'	'	'	'	-65.6	-41.8	32.1
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	'	'	'	'	'	'	'	'	-121.9	-113.2	-67.4
INCOME TAX PROVISION	'	'	'	'	'	'	'	'	0	0	0
DISCONTINUED OPERATIONS, NET	'	'	'	'	'	'	'	'	0	0	0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	'	'	'	'	'	'	'	'	1,540.10	1,282.90	667.8
NET INCOME	'	'	'	'	'	'	'	'	1,418.20	1,169.70	600.4
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	'	'	'	'	'	'	'	'	0	0	0
NET INCOME ATTRIBUTABLE TO ENSCO	'	'	'	'	'	'	'	'	1,418.20	1,169.70	600.4
ENSCO International Inc. [Member]	'	'	'	'	'	'	'	'	'	'	'
Guarantor Obligations [Line Items]	'	'	'	'	'	'	'	'	'	'	'
OPERATING REVENUES	'	'	'	'	'	'	'	'	149.4	147.6	70
Contract drilling (exclusive of depreciation)	'	'	'	'	'	'	'	'	149.4	147.6	70
Depreciation	'	'	'	'	'	'	'	'	4	3.5	1.8
General and administrative	'	'	'	'	'	'	'	'	0.5	0.4	0
OPERATING INCOME	'	'	'	'	'	'	'	'	-4.5	-3.9	-1.8
OTHER (EXPENSE) INCOME, NET	'	'	'	'	'	'	'	'	-9.4	-7	0.4
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	'	'	'	'	'	'	'	'	-13.9	-10.9	-1.4
INCOME TAX PROVISION	'	'	'	'	'	'	'	'	92.5	68.8	38.5
DISCONTINUED OPERATIONS, NET	'	'	'	'	'	'	'	'	0	0	-11.1
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	'	'	'	'	'	'	'	'	366.2	335.9	271.5
NET INCOME	'	'	'	'	'	'	'	'	259.8	256.2	220.5
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	'	'	'	'	'	'	'	'	0	0	0
NET INCOME ATTRIBUTABLE TO ENSCO	'	'	'	'	'	'	'	'	259.8	256.2	220.5
Pride International Inc. [Member]	'	'	'	'	'	'	'	'	'	'	'
Guarantor Obligations [Line Items]	'	'	'	'	'	'	'	'	'	'	'
OPERATING REVENUES	'	'	'	'	'	'	'	'	0	0	0
Contract drilling (exclusive of depreciation)	'	'	'	'	'	'	'	'	0	0	0
Depreciation	'	'	'	'	'	'	'	'	0	0	0
General and administrative	'	'	'	'	'	'	'	'	0	0	0
OPERATING INCOME	'	'	'	'	'	'	'	'	0	0	0
OTHER (EXPENSE) INCOME, NET	'	'	'	'	'	'	'	'	-27.9	-50	-22.7
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	'	'	'	'	'	'	'	'	-27.9	-50	-22.7
INCOME TAX PROVISION	'	'	'	'	'	'	'	'	0	0	1.5
DISCONTINUED OPERATIONS, NET	'	'	'	'	'	'	'	'	0	0	0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	'	'	'	'	'	'	'	'	111.6	239.2	143.9
NET INCOME	'	'	'	'	'	'	'	'	83.7	189.2	119.7
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	'	'	'	'	'	'	'	'	0	0	0
NET INCOME ATTRIBUTABLE TO ENSCO	'	'	'	'	'	'	'	'	83.7	189.2	119.7
Other Non-Guarantor Subsidiaries Of Ensco [Member]	'	'	'	'	'	'	'	'	'	'	'
Guarantor Obligations [Line Items]	'	'	'	'	'	'	'	'	'	'	'
OPERATING REVENUES	'	'	'	'	'	'	'	'	4,642.90	3,997.70	2,671
Contract drilling (exclusive of depreciation)	'	'	'	'	'	'	'	'	2,210.60	1,869.20	1,311
Depreciation	'	'	'	'	'	'	'	'	523.9	472.2	355.4
General and administrative	'	'	'	'	'	'	'	'	82.8	84.7	106.4
OPERATING INCOME	'	'	'	'	'	'	'	'	1,825.60	1,571.60	898.2
OTHER (EXPENSE) INCOME, NET	'	'	'	'	'	'	'	'	2.8	0.2	-67.7
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	'	'	'	'	'	'	'	'	1,828.40	1,571.80	830.5
INCOME TAX PROVISION	'	'	'	'	'	'	'	'	120.2	169.3	71.6
DISCONTINUED OPERATIONS, NET	'	'	'	'	'	'	'	'	-24.1	17.1	-10.7
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	'	'	'	'	'	'	'	'	0	0	0
NET INCOME	'	'	'	'	'	'	'	'	1,684.10	1,419.60	748.2
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	'	'	'	'	'	'	'	'	-9.7	-7	-5.2
NET INCOME ATTRIBUTABLE TO ENSCO	'	'	'	'	'	'	'	'	1,674.40	1,412.60	743
Consolidating Adjustments [Member]	'	'	'	'	'	'	'	'	'	'	'
Guarantor Obligations [Line Items]	'	'	'	'	'	'	'	'	'	'	'
OPERATING REVENUES	'	'	'	'	'	'	'	'	-307.4	-320.1	-141.8
Contract drilling (exclusive of depreciation)	'	'	'	'	'	'	'	'	-307.4	-320.1	-141.8
Depreciation	'	'	'	'	'	'	'	'	0	0	0
General and administrative	'	'	'	'	'	'	'	'	0	0	0
OPERATING INCOME	'	'	'	'	'	'	'	'	0	0	0
OTHER (EXPENSE) INCOME, NET	'	'	'	'	'	'	'	'	0	0	0
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	'	'	'	'	'	'	'	'	0	0	0
INCOME TAX PROVISION	'	'	'	'	'	'	'	'	0	0	0
DISCONTINUED OPERATIONS, NET	'	'	'	'	'	'	'	'	0	0	'
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	'	'	'	'	'	'	'	'	-2,017.90	-1,858	-1,083.20
NET INCOME	'	'	'	'	'	'	'	'	-2,017.90	-1,858	-1,083.20
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	'	'	'	'	'	'	'	'	0	0	0
NET INCOME ATTRIBUTABLE TO ENSCO	'	'	'	'	'	'	'	'	($2,017.90)	($1,858)	($1,083.20)

Guarantee_Of_Registered_Securi4

Guarantee Of Registered Securities (Condensed Consolidating Statements Of Comprehensive Income) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Guarantor Obligations [Line Items]	'	'	'	'	'	'	'	'	'	'	'
NET INCOME	$364	$381.40	$362.60	$319.90	$221.20	$345.40	$342.70	$267.40	$1,427.90	$1,176.70	$605.60
OTHER COMPREHENSIVE INCOME (LOSS), NET	'	'	'	'	'	'	'	'	'	'	'
Net change in fair value of derivatives	'	'	'	'	'	'	'	'	-5.8	8.7	0.1
Reclassification of gains and losses on derivative instruments from other comprehensive (income) loss into net income	'	'	'	'	'	'	'	'	2	0	-5.5
Other	'	'	'	'	'	'	'	'	1.9	2.8	2.9
NET OTHER COMPREHENSIVE INCOME (LOSS)	'	'	'	'	'	'	'	'	-1.9	11.5	-2.5
COMPREHENSIVE INCOME	'	'	'	'	'	'	'	'	1,426	1,188.20	603.1
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	'	'	'	'	'	'	'	'	-9.7	-7	-5.2
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	'	'	'	'	'	'	'	'	1,416.30	1,181.20	597.9
Ensco Plc [Member]	'	'	'	'	'	'	'	'	'	'	'
Guarantor Obligations [Line Items]	'	'	'	'	'	'	'	'	'	'	'
NET INCOME	'	'	'	'	'	'	'	'	1,418.20	1,169.70	600.4
OTHER COMPREHENSIVE INCOME (LOSS), NET	'	'	'	'	'	'	'	'	'	'	'
Net change in fair value of derivatives	'	'	'	'	'	'	'	'	0	0	0
Reclassification of gains and losses on derivative instruments from other comprehensive (income) loss into net income	'	'	'	'	'	'	'	'	0	0	0
Other	'	'	'	'	'	'	'	'	0	0	0
NET OTHER COMPREHENSIVE INCOME (LOSS)	'	'	'	'	'	'	'	'	0	0	0
COMPREHENSIVE INCOME	'	'	'	'	'	'	'	'	1,418.20	1,169.70	600.4
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	'	'	'	'	'	'	'	'	0	0	0
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	'	'	'	'	'	'	'	'	1,418.20	1,169.70	600.4
ENSCO International Inc. [Member]	'	'	'	'	'	'	'	'	'	'	'
Guarantor Obligations [Line Items]	'	'	'	'	'	'	'	'	'	'	'
NET INCOME	'	'	'	'	'	'	'	'	259.8	256.2	220.5
OTHER COMPREHENSIVE INCOME (LOSS), NET	'	'	'	'	'	'	'	'	'	'	'
Net change in fair value of derivatives	'	'	'	'	'	'	'	'	-5.8	6.3	-4.2
Reclassification of gains and losses on derivative instruments from other comprehensive (income) loss into net income	'	'	'	'	'	'	'	'	2	0.2	0.2
Other	'	'	'	'	'	'	'	'	0	0	0
NET OTHER COMPREHENSIVE INCOME (LOSS)	'	'	'	'	'	'	'	'	-3.8	6.5	-4
COMPREHENSIVE INCOME	'	'	'	'	'	'	'	'	256	262.7	216.5
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	'	'	'	'	'	'	'	'	0	0	0
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	'	'	'	'	'	'	'	'	256	262.7	216.5
Pride International Inc. [Member]	'	'	'	'	'	'	'	'	'	'	'
Guarantor Obligations [Line Items]	'	'	'	'	'	'	'	'	'	'	'
NET INCOME	'	'	'	'	'	'	'	'	83.7	189.2	119.7
OTHER COMPREHENSIVE INCOME (LOSS), NET	'	'	'	'	'	'	'	'	'	'	'
Net change in fair value of derivatives	'	'	'	'	'	'	'	'	0	0	0
Reclassification of gains and losses on derivative instruments from other comprehensive (income) loss into net income	'	'	'	'	'	'	'	'	0	0	0
Other	'	'	'	'	'	'	'	'	0	0	0
NET OTHER COMPREHENSIVE INCOME (LOSS)	'	'	'	'	'	'	'	'	0	0	0
COMPREHENSIVE INCOME	'	'	'	'	'	'	'	'	83.7	189.2	119.7
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	'	'	'	'	'	'	'	'	0	0	0
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	'	'	'	'	'	'	'	'	83.7	189.2	119.7
Other Non-Guarantor Subsidiaries Of Ensco [Member]	'	'	'	'	'	'	'	'	'	'	'
Guarantor Obligations [Line Items]	'	'	'	'	'	'	'	'	'	'	'
NET INCOME	'	'	'	'	'	'	'	'	1,684.10	1,419.60	748.2
OTHER COMPREHENSIVE INCOME (LOSS), NET	'	'	'	'	'	'	'	'	'	'	'
Net change in fair value of derivatives	'	'	'	'	'	'	'	'	0	2.4	4.3
Reclassification of gains and losses on derivative instruments from other comprehensive (income) loss into net income	'	'	'	'	'	'	'	'	0	-0.2	-5.7
Other	'	'	'	'	'	'	'	'	1.9	2.8	2.9
NET OTHER COMPREHENSIVE INCOME (LOSS)	'	'	'	'	'	'	'	'	1.9	5	1.5
COMPREHENSIVE INCOME	'	'	'	'	'	'	'	'	1,686	1,424.60	749.7
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	'	'	'	'	'	'	'	'	-9.7	-7	-5.2
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	'	'	'	'	'	'	'	'	1,676.30	1,417.60	744.5
Consolidating Adjustments [Member]	'	'	'	'	'	'	'	'	'	'	'
Guarantor Obligations [Line Items]	'	'	'	'	'	'	'	'	'	'	'
NET INCOME	'	'	'	'	'	'	'	'	-2,017.90	-1,858	-1,083.20
OTHER COMPREHENSIVE INCOME (LOSS), NET	'	'	'	'	'	'	'	'	'	'	'
Net change in fair value of derivatives	'	'	'	'	'	'	'	'	0	0	0
Reclassification of gains and losses on derivative instruments from other comprehensive (income) loss into net income	'	'	'	'	'	'	'	'	0	0	0
Other	'	'	'	'	'	'	'	'	0	0	0
NET OTHER COMPREHENSIVE INCOME (LOSS)	'	'	'	'	'	'	'	'	0	0	0
COMPREHENSIVE INCOME	'	'	'	'	'	'	'	'	-2,017.90	-1,858	-1,083.20
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	'	'	'	'	'	'	'	'	0	0	0
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	'	'	'	'	'	'	'	'	($2,017.90)	($1,858)	($1,083.20)

Guarantee_Of_Registered_Securi5

Guarantee Of Registered Securities (Condensed Consolidating Balance Sheets) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
In Millions, unless otherwise specified
Guarantor Obligations [Line Items]	'	'	'	'
Cash and cash equivalents	$165.60	$487.10	$430.70	$1,050.70
Accounts receivable	855.7	811.4	'	'
Accounts receivable from affiliates	0	0	'	'
Other	513.9	425.4	'	'
Total current assets	1,535.20	1,723.90	'	'
PROPERTY AND EQUIPMENT, AT COST	17,498.50	15,737.10	'	'
Less accumulated depreciation	3,187.50	2,591.50	'	'
Property and equipment, net	14,311	13,145.60	12,421.90	'
GOODWILL	3,274	3,274	'	'
DUE FROM AFFILIATES	0	0	'	'
INVESTMENTS IN AFFILIATES	0	0	'	'
OTHER ASSETS, NET	352.7	421.8	'	'
TOTAL ASSETS	19,472.90	18,565.30	'	'
Accounts payable and accrued liabilities	999.8	942.2	'	'
Accounts payable to affiliates	0	0	'	'
Current maturities of long-term debt	47.5	47.5	'	'
Total current liabilities	1,047.30	989.7	'	'
DUE TO AFFILIATES	0	0	'	'
LONG-TERM DEBT	4,718.90	4,798.40	'	'
DEFERRED INCOME TAXES	362.1	351.7	'	'
OTHER LIABILITIES	545.7	573.4	'	'
ENSCO SHAREHOLDERS' EQUITY	12,791.60	11,846.40	'	'
NONCONTROLLING INTERESTS	7.3	5.7	'	'
Total equity	12,798.90	11,852.10	'	'
Total liabilities and shareholders' equity	19,472.90	18,565.30	'	'
Ensco Plc [Member]	'	'	'	'
Guarantor Obligations [Line Items]	'	'	'	'
Cash and cash equivalents	46.5	271.8	236.6	3.4
Accounts receivable	0	0	'	'
Accounts receivable from affiliates	1,235	1,294.50	'	'
Other	3.2	2.8	'	'
Total current assets	1,284.70	1,569.10	'	'
PROPERTY AND EQUIPMENT, AT COST	2.1	2.1	'	'
Less accumulated depreciation	1.5	1.1	'	'
Property and equipment, net	0.6	1	'	'
GOODWILL	0	0	'	'
DUE FROM AFFILIATES	4,876.80	3,483.50	'	'
INVESTMENTS IN AFFILIATES	13,830.10	13,469.30	'	'
OTHER ASSETS, NET	8.8	11.3	'	'
TOTAL ASSETS	20,001	18,534.20	'	'
Accounts payable and accrued liabilities	31.5	31	'	'
Accounts payable to affiliates	3,666.10	2,364.80	'	'
Current maturities of long-term debt	0	0	'	'
Total current liabilities	3,697.60	2,395.80	'	'
DUE TO AFFILIATES	1,030.80	1,816.70	'	'
LONG-TERM DEBT	2,473.70	2,469.60	'	'
DEFERRED INCOME TAXES	0	0	'	'
OTHER LIABILITIES	0	0	'	'
ENSCO SHAREHOLDERS' EQUITY	12,798.90	11,852.10	'	'
NONCONTROLLING INTERESTS	0	0	'	'
Total equity	12,798.90	11,852.10	'	'
Total liabilities and shareholders' equity	20,001	18,534.20	'	'
ENSCO International Inc. [Member]	'	'	'	'
Guarantor Obligations [Line Items]	'	'	'	'
Cash and cash equivalents	0.5	1.7	0	19.1
Accounts receivable	0	0.2	'	'
Accounts receivable from affiliates	213.8	226.5	'	'
Other	61.3	24.9	'	'
Total current assets	275.6	253.3	'	'
PROPERTY AND EQUIPMENT, AT COST	34.3	30.2	'	'
Less accumulated depreciation	26.5	23.5	'	'
Property and equipment, net	7.8	6.7	'	'
GOODWILL	0	0	'	'
DUE FROM AFFILIATES	4,236	3,594.70	'	'
INVESTMENTS IN AFFILIATES	4,868.60	2,693.80	'	'
OTHER ASSETS, NET	60.1	67.4	'	'
TOTAL ASSETS	9,448.10	6,615.90	'	'
Accounts payable and accrued liabilities	9.1	28.1	'	'
Accounts payable to affiliates	549.7	136.9	'	'
Current maturities of long-term debt	0	0	'	'
Total current liabilities	558.8	165	'	'
DUE TO AFFILIATES	2,760.40	2,054.70	'	'
LONG-TERM DEBT	149.1	149	'	'
DEFERRED INCOME TAXES	358.3	335.1	'	'
OTHER LIABILITIES	2.3	0	'	'
ENSCO SHAREHOLDERS' EQUITY	5,619.20	3,912.10	'	'
NONCONTROLLING INTERESTS	0	0	'	'
Total equity	5,619.20	3,912.10	'	'
Total liabilities and shareholders' equity	9,448.10	6,615.90	'	'
Pride International Inc. [Member]	'	'	'	'
Guarantor Obligations [Line Items]	'	'	'	'
Cash and cash equivalents	4.9	85	22.6	0
Accounts receivable	0	0	'	'
Accounts receivable from affiliates	5.5	0	'	'
Other	0	0	'	'
Total current assets	10.4	85	'	'
PROPERTY AND EQUIPMENT, AT COST	0	0	'	'
Less accumulated depreciation	0	0	'	'
Property and equipment, net	0	0	'	'
GOODWILL	0	0	'	'
DUE FROM AFFILIATES	1,898	1,628.40	'	'
INVESTMENTS IN AFFILIATES	4,092.20	3,824.80	'	'
OTHER ASSETS, NET	0	0	'	'
TOTAL ASSETS	6,000.60	5,538.20	'	'
Accounts payable and accrued liabilities	34.2	34.1	'	'
Accounts payable to affiliates	0	0	'	'
Current maturities of long-term debt	0	0	'	'
Total current liabilities	34.2	34.1	'	'
DUE TO AFFILIATES	1,331.10	877.5	'	'
LONG-TERM DEBT	2,007.80	2,040.80	'	'
DEFERRED INCOME TAXES	0	0	'	'
OTHER LIABILITIES	8.7	10.8	'	'
ENSCO SHAREHOLDERS' EQUITY	2,618.80	2,575	'	'
NONCONTROLLING INTERESTS	0	0	'	'
Total equity	2,618.80	2,575	'	'
Total liabilities and shareholders' equity	6,000.60	5,538.20	'	'
Other Non-Guarantor Subsidiaries Of Ensco [Member]	'	'	'	'
Guarantor Obligations [Line Items]	'	'	'	'
Cash and cash equivalents	113.7	128.6	171.5	1,028.20
Accounts receivable	855.7	811.2	'	'
Accounts receivable from affiliates	4,169.20	2,375.10	'	'
Other	449.4	397.7	'	'
Total current assets	5,588	3,712.60	'	'
PROPERTY AND EQUIPMENT, AT COST	17,462.10	15,704.80	'	'
Less accumulated depreciation	3,159.50	2,566.90	'	'
Property and equipment, net	14,302.60	13,137.90	'	'
GOODWILL	3,274	3,274	'	'
DUE FROM AFFILIATES	5,069.70	4,748.90	'	'
INVESTMENTS IN AFFILIATES	0	0	'	'
OTHER ASSETS, NET	283.8	343.1	'	'
TOTAL ASSETS	28,518.10	25,216.50	'	'
Accounts payable and accrued liabilities	925	849	'	'
Accounts payable to affiliates	1,407.70	1,394.40	'	'
Current maturities of long-term debt	47.5	47.5	'	'
Total current liabilities	2,380.20	2,290.90	'	'
DUE TO AFFILIATES	10,958.20	8,706.60	'	'
LONG-TERM DEBT	88.3	139	'	'
DEFERRED INCOME TAXES	3.8	16.6	'	'
OTHER LIABILITIES	534.7	562.6	'	'
ENSCO SHAREHOLDERS' EQUITY	14,545.60	13,495.10	'	'
NONCONTROLLING INTERESTS	7.3	5.7	'	'
Total equity	14,552.90	13,500.80	'	'
Total liabilities and shareholders' equity	28,518.10	25,216.50	'	'
Consolidating Adjustments [Member]	'	'	'	'
Guarantor Obligations [Line Items]	'	'	'	'
Cash and cash equivalents	0	0	0	0
Accounts receivable	0	0	'	'
Accounts receivable from affiliates	-5,623.50	-3,896.10	'	'
Other	0	0	'	'
Total current assets	-5,623.50	-3,896.10	'	'
PROPERTY AND EQUIPMENT, AT COST	0	0	'	'
Less accumulated depreciation	0	0	'	'
Property and equipment, net	0	0	'	'
GOODWILL	0	0	'	'
DUE FROM AFFILIATES	-16,080.50	-13,455.50	'	'
INVESTMENTS IN AFFILIATES	-22,790.90	-19,987.90	'	'
OTHER ASSETS, NET	0	0	'	'
TOTAL ASSETS	-44,494.90	-37,339.50	'	'
Accounts payable and accrued liabilities	0	0	'	'
Accounts payable to affiliates	-5,623.50	-3,896.10	'	'
Current maturities of long-term debt	0	0	'	'
Total current liabilities	-5,623.50	-3,896.10	'	'
DUE TO AFFILIATES	-16,080.50	-13,455.50	'	'
LONG-TERM DEBT	0	0	'	'
DEFERRED INCOME TAXES	0	0	'	'
OTHER LIABILITIES	0	0	'	'
ENSCO SHAREHOLDERS' EQUITY	-22,790.90	-19,987.90	'	'
NONCONTROLLING INTERESTS	0	0	'	'
Total equity	-22,790.90	-19,987.90	'	'
Total liabilities and shareholders' equity	($44,494.90)	($37,339.50)	'	'

Guarantee_Of_Registered_Securi6

Guarantee Of Registered Securities (Condensed Consolidating Statements Of Cash Flows) (Details) (USD $)	12 Months Ended			31 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013
OPERATING ACTIVITIES	'	'	'	'
Net cash (used in) provided by operating activities of continuing operations	$1,886.70	$2,074.10	$757.40	'
INVESTING ACTIVITIES	'	'	'	'
Acquisition of Pride International, Inc., net of cash acquired	0	0	-2,656	'
Additions to property and equipment	-1,768.50	-1,715	-645.7	'
Purchases of short-term investments	-50	-90	-4.5	'
Maturities of short-term investments	50	44.5	0	'
Other	6	3.2	5.3	'
Net cash used in investing activities of continuing operations	-1,762.50	-1,757.30	-3,300.90	'
FINANCING ACTIVITIES	'	'	'	'
Proceeds from issuance of senior notes	0	0	2,462.80	'
Cash dividends paid	-525.6	-348.1	-292.3	'
Commercial paper borrowings, net	0	-125	125	'
Equity financing costs	0	66.7	-70.5	'
Reduction of long-term borrowings	-47.5	-47.5	-213.3	'
Proceeds from exercise of share options	22.3	35.8	39.9	'
Debt financing costs	-4.6	0	-31.8	'
Advances (to) from affiliates	0	0	0	'
Other	-21.7	-17.4	-15.7	'
Net cash (used in) provided by financing activities of continuing operations	-577.1	-435.5	2,004.10	'
DISCONTINUED OPERATIONS	'	'	'	'
Operating activities	93.8	113	-25.2	'
Investing activities	37.8	60.1	-54.6	'
Net cash provided by discontinued operations	131.6	173.1	-79.8	203	[1]
Effect of exchange rate changes on cash and cash equivalents	-0.2	2	-0.8	'
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	-321.5	56.4	-620	'
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	487.1	430.7	1,050.70	'
CASH AND CASH EQUIVALENTS, END OF YEAR	165.6	487.1	430.7	165.6
Ensco Plc [Member]	'	'	'	'
OPERATING ACTIVITIES	'	'	'	'
Net cash (used in) provided by operating activities of continuing operations	-114.8	-71.6	2	'
INVESTING ACTIVITIES	'	'	'	'
Acquisition of Pride International, Inc., net of cash acquired	'	'	0	'
Additions to property and equipment	0	0	0	'
Purchases of short-term investments	0	0	0	'
Maturities of short-term investments	0	0	'	'
Other	0	-0.3	0	'
Net cash used in investing activities of continuing operations	0	-0.3	0	'
FINANCING ACTIVITIES	'	'	'	'
Proceeds from issuance of senior notes	'	'	2,462.80	'
Cash dividends paid	-525.6	-348.1	-292.3	'
Commercial paper borrowings, net	'	-125	125	'
Equity financing costs	'	66.7	-70.5	'
Reduction of long-term borrowings	0	0	0	'
Proceeds from exercise of share options	22.3	23.9	0	'
Debt financing costs	0	'	-27.1	'
Advances (to) from affiliates	407.2	501.2	-1,956.10	'
Other	-14.4	-11.6	-10.6	'
Net cash (used in) provided by financing activities of continuing operations	-110.5	107.1	231.2	'
DISCONTINUED OPERATIONS	'	'	'	'
Operating activities	0	0	0	'
Investing activities	0	0	0	'
Net cash provided by discontinued operations	0	0	0	'
Effect of exchange rate changes on cash and cash equivalents	0	0	0	'
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	-225.3	35.2	233.2	'
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	271.8	236.6	3.4	'
CASH AND CASH EQUIVALENTS, END OF YEAR	46.5	271.8	236.6	46.5
ENSCO International Inc. [Member]	'	'	'	'
OPERATING ACTIVITIES	'	'	'	'
Net cash (used in) provided by operating activities of continuing operations	-128.7	-38.2	-2.6	'
INVESTING ACTIVITIES	'	'	'	'
Acquisition of Pride International, Inc., net of cash acquired	'	'	0	'
Additions to property and equipment	0	0	0	'
Purchases of short-term investments	0	0	0	'
Maturities of short-term investments	0	0	'	'
Other	-4.1	0.4	-6.1	'
Net cash used in investing activities of continuing operations	-4.1	0.4	-6.1	'
FINANCING ACTIVITIES	'	'	'	'
Proceeds from issuance of senior notes	'	'	0	'
Cash dividends paid	0	0	0	'
Commercial paper borrowings, net	'	0	0	'
Equity financing costs	'	0	0	'
Reduction of long-term borrowings	0	0	0	'
Proceeds from exercise of share options	0	11.9	39.9	'
Debt financing costs	-4.6	'	-4.7	'
Advances (to) from affiliates	136.2	27.6	-34.5	'
Other	0	0	0	'
Net cash (used in) provided by financing activities of continuing operations	131.6	39.5	0.7	'
DISCONTINUED OPERATIONS	'	'	'	'
Operating activities	0	0	-11.1	'
Investing activities	0	0	0	'
Net cash provided by discontinued operations	0	0	-11.1	'
Effect of exchange rate changes on cash and cash equivalents	0	0	0	'
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	-1.2	1.7	-19.1	'
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	1.7	0	19.1	'
CASH AND CASH EQUIVALENTS, END OF YEAR	0.5	1.7	0	0.5
Pride International Inc. [Member]	'	'	'	'
OPERATING ACTIVITIES	'	'	'	'
Net cash (used in) provided by operating activities of continuing operations	-62.9	-21.6	-59.9	'
INVESTING ACTIVITIES	'	'	'	'
Acquisition of Pride International, Inc., net of cash acquired	'	'	92.9	'
Additions to property and equipment	0	0	0	'
Purchases of short-term investments	0	0	0	'
Maturities of short-term investments	0	0	'	'
Other	0	0	0	'
Net cash used in investing activities of continuing operations	0	0	92.9	'
FINANCING ACTIVITIES	'	'	'	'
Proceeds from issuance of senior notes	'	'	0	'
Cash dividends paid	0	0	0	'
Commercial paper borrowings, net	'	0	0	'
Equity financing costs	'	0	0	'
Reduction of long-term borrowings	0	0	-181	'
Proceeds from exercise of share options	0	0	'	'
Debt financing costs	0	'	0	'
Advances (to) from affiliates	-17.2	84	170.6	'
Other	0	0	0	'
Net cash (used in) provided by financing activities of continuing operations	-17.2	84	-10.4	'
DISCONTINUED OPERATIONS	'	'	'	'
Operating activities	0	0	0	'
Investing activities	0	0	0	'
Net cash provided by discontinued operations	0	0	0	'
Effect of exchange rate changes on cash and cash equivalents	0	0	0	'
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	-80.1	62.4	22.6	'
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	85	22.6	0	'
CASH AND CASH EQUIVALENTS, END OF YEAR	4.9	85	22.6	4.9
Other Non-Guarantor Subsidiaries Of Ensco [Member]	'	'	'	'
OPERATING ACTIVITIES	'	'	'	'
Net cash (used in) provided by operating activities of continuing operations	2,193.10	2,205.50	817.9	'
INVESTING ACTIVITIES	'	'	'	'
Acquisition of Pride International, Inc., net of cash acquired	'	'	-2,748.90	'
Additions to property and equipment	-1,768.50	-1,715	-645.7	'
Purchases of short-term investments	-50	-90	-4.5	'
Maturities of short-term investments	50	44.5	'	'
Other	10.1	3.1	11.4	'
Net cash used in investing activities of continuing operations	-1,758.40	-1,757.40	-3,387.70	'
FINANCING ACTIVITIES	'	'	'	'
Proceeds from issuance of senior notes	'	'	0	'
Cash dividends paid	0	0	0	'
Commercial paper borrowings, net	'	0	0	'
Equity financing costs	'	0	0	'
Reduction of long-term borrowings	-47.5	-47.5	-32.3	'
Proceeds from exercise of share options	0	0	'	'
Debt financing costs	0	'	0	'
Advances (to) from affiliates	-526.2	-612.8	1,820	'
Other	-7.3	-5.8	-5.1	'
Net cash (used in) provided by financing activities of continuing operations	-581	-666.1	1,782.60	'
DISCONTINUED OPERATIONS	'	'	'	'
Operating activities	93.8	113	-14.1	'
Investing activities	37.8	60.1	-54.6	'
Net cash provided by discontinued operations	131.6	173.1	-68.7	'
Effect of exchange rate changes on cash and cash equivalents	-0.2	2	-0.8	'
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	-14.9	-42.9	-856.7	'
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	128.6	171.5	1,028.20	'
CASH AND CASH EQUIVALENTS, END OF YEAR	113.7	128.6	171.5	113.7
Consolidating Adjustments [Member]	'	'	'	'
OPERATING ACTIVITIES	'	'	'	'
Net cash (used in) provided by operating activities of continuing operations	0	0	0	'
INVESTING ACTIVITIES	'	'	'	'
Acquisition of Pride International, Inc., net of cash acquired	'	'	0	'
Additions to property and equipment	0	0	0	'
Purchases of short-term investments	0	0	0	'
Maturities of short-term investments	0	0	'	'
Other	0	0	0	'
Net cash used in investing activities of continuing operations	0	0	0	'
FINANCING ACTIVITIES	'	'	'	'
Proceeds from issuance of senior notes	'	'	0	'
Cash dividends paid	0	0	0	'
Commercial paper borrowings, net	'	0	0	'
Equity financing costs	'	0	0	'
Reduction of long-term borrowings	0	0	0	'
Proceeds from exercise of share options	0	0	'	'
Debt financing costs	0	'	0	'
Advances (to) from affiliates	0	0	0	'
Other	0	0	0	'
Net cash (used in) provided by financing activities of continuing operations	0	0	0	'
DISCONTINUED OPERATIONS	'	'	'	'
Operating activities	0	0	0	'
Investing activities	0	0	0	'
Net cash provided by discontinued operations	0	0	0	'
Effect of exchange rate changes on cash and cash equivalents	0	0	0	'
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	0	0	0	'
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	0	0	0	'
CASH AND CASH EQUIVALENTS, END OF YEAR	$0	$0	$0	$0
[1]	The rigs' operating results were reclassified to discontinued operations in our consolidated statements of income for each of the years in the three-year period ended DecemberB 31, 2013 and were previously included within the operating segment noted in the above table.

Unaudited_Quarterly_Financial_2

Unaudited Quarterly Financial Data (Summary Of Unaudited Quarterly Consolidated Income Statement) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Data [Abstract]	'	'	'	'	'	'	'	'	'	'	'
OPERATING REVENUES	$1,187.10	$1,162.20	$1,130.30	$1,040.30	$973.10	$1,013.90	$965.70	$916.50	$4,519.90	$3,869.20	$2,599.20
Contract drilling (exclusive of depreciation)	538.8	534.3	527.2	479.8	450.5	434.1	423.4	439.9	2,080.10	1,747.90	1,286.10
Depreciation	135.7	132.6	132	127.9	123	121.2	115.5	116.4	528.2	476.1	357.6
General and administrative	35.2	37.4	36.4	37.8	35	40.2	35.5	38.2	146.8	148.9	158.6
OPERATING INCOME	477.4	457.9	434.7	394.8	364.6	418.4	391.3	322	1,764.80	1,496.30	796.9
Other income (expense), net	-28.9	-1.6	-39.8	-29.8	-21.7	-25.5	-24.7	-26.7	-100.1	-98.6	-57.9
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	448.5	456.3	394.9	365	342.9	392.9	366.6	295.3	1,664.70	1,397.70	739
Provision for income taxes	48	65.4	48.5	50.8	120.6	44.3	40.4	32.8	212.7	238.1	111.6
Income from continuing operations	400.5	390.9	346.4	314.2	222.3	348.6	326.2	262.5	1,452	1,159.60	627.4
DISCONTINUED OPERATIONS, NET	-36.5	-9.5	16.2	5.7	-1.1	-3.2	16.5	4.9	-24.1	17.1	-21.8
NET INCOME	364	381.4	362.6	319.9	221.2	345.4	342.7	267.4	1,427.90	1,176.70	605.6
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	-2.6	-2.6	-1.7	-2.8	-1.7	-1.9	-1.4	-2	-9.7	-7	-5.2
NET INCOME ATTRIBUTABLE TO ENSCO	$361.40	$378.80	$360.90	$317.10	$219.50	$343.50	$341.30	$265.40	$1,418.20	$1,169.70	$600.40
EARNINGS PER SHARE - BASIC	'	'	'	'	'	'	'	'	'	'	'
Continuing operations	$1.71	$1.66	$1.48	$1.34	$0.95	$1.49	$1.40	$1.13	$6.19	$4.97	$3.20
Discontinued operations	($0.16)	($0.04)	$0.07	$0.02	($0.01)	($0.01)	$0.07	$0.02	($0.11)	$0.08	($0.11)
Total earnings per share - basic	$1.55	$1.62	$1.55	$1.36	$0.94	$1.48	$1.47	$1.15	$6.08	$5.05	$3.09
EARNINGS PER SHARE - DILUTED	'	'	'	'	'	'	'	'	'	'	'
Continuing operations	$1.70	$1.66	$1.48	$1.34	$0.95	$1.49	$1.40	$1.13	$6.18	$4.97	$3.19
Discontinued operations	($0.16)	($0.04)	$0.07	$0.02	($0.01)	($0.01)	$0.07	$0.02	($0.11)	$0.07	($0.11)
Total earnings per share - diluted	$1.54	$1.62	$1.55	$1.36	$0.94	$1.48	$1.47	$1.15	$6.07	$5.04	$3.08

Subsequent_Events_Subsequent_E1

Subsequent Events Subsequent Events (Narrative) (Details) (USD $)

3 Months Ended

12 Months Ended

31 Months Ended

3 Months Ended

1 Months Ended

3 Months Ended

In Millions, unless otherwise specified

Jun. 30, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Jun. 30, 2014

Apr. 30, 2014

Jun. 30, 2014

Jackup [Member]

Jackup [Member]

Jackup [Member]

Jackup [Member]

Discontinued Operations [Member]

ENSCO 69 and Wisconsin [Member]

ENSCO 69 and Wisconsin [Member]

ENSCO 85 [Member]

ENSCO 85 [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Line Items]

'

'

'

'

'

'

'

'

'

'

Net Cash Provided by (Used in) Discontinued Operations

'

$131.60

$173.10

($79.80)

$203

[1]

'

$32.20

[1]

$64.40

$64.40

'

Assets Held-for-sale, Long Lived

'

'

'

'

'

8.6

[1]

'

'

'

'

Impairment of Long-Lived Assets to be Disposed of

'

'

'

'

'

'

'

'

'

546.4

Asset Impairment Charges

$991.50

'

'

'

'

'

'

'

'

'

[1]

The rigs' operating results were reclassified to discontinued operations in our consolidated statements of income for each of the years in the three-year period ended DecemberB 31, 2013 and were previously included within the operating segment noted in the above table.