10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

     Washington, D.C. 20549     

FORM 10-Q

(Mark One)
x	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2013

OR

o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from  to

Commission File Number 1-8097

Ensco plc

(Exact name of registrant as specified in its charter)

England and Wales (State or other jurisdiction of incorporation or organization) 6 Chesterfield Gardens London, England (Address of principal executive offices) 98-0635229 (I.R.S. Employer Identification No.) W1J 5BQ (Zip Code)

 Registrant's telephone number, including area code:  44 (0) 20 7659 4660

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes x  No  o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  Yes x        No  o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See the definitions of "large accelerated filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer	x	Accelerated filer	o
Non-Accelerated filer	o  (Do not check if a smaller reporting company)	Smaller reporting company	o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  o      No  x

As of April 22, 2013, there were 232,917,732 Class A ordinary shares of the registrant issued and outstanding.

ENSCO PLC

INDEX TO FORM 10-Q

FOR THE QUARTER ENDED MARCH 31, 2013

PART I      FINANCIAL INFORMATION
ITEM 1.   FINANCIAL STATEMENTS
Report of Independent Registered Public Accounting Firm	3
Condensed Consolidated Statements of Income Three Months Ended March 31, 2013 and 2012	4
Condensed Consolidated Statements of Comprehensive Income Three Months Ended March 31, 2013 and 2012	5
Condensed Consolidated Balance Sheets March 31, 2013 and December 31, 2012	6
Condensed Consolidated Statements of Cash Flows Three Months Ended March 31, 2013 and 2012	7
Notes to Condensed Consolidated Financial Statements	8
ITEM 2.   MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	29
ITEM 3.   QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	44
ITEM 4.   CONTROLS AND PROCEDURES	44
PART II     OTHER INFORMATION
ITEM 1.   LEGAL PROCEEDINGS	45
ITEM 1A. RISK FACTORS	46
ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	47
ITEM 6.  EXHIBITS	48
SIGNATURES	49

FORWARD-LOOKING STATEMENTS

Statements contained in this report that are not historical facts are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934.  Forward-looking statements include words or phrases such as "anticipate," "believe," "estimate," "expect," "intend," "plan," "project," "could," "may," "might," "should," "will" and similar words and specifically include statements regarding expected financial performance; expected utilization, day rates, revenues, operating expenses, contract term, contract backlog, capital expenditures, insurance, financing and funding; the timing of availability, delivery, mobilization, contract commencement or relocation or other movement of rigs; future rig construction (including construction in progress and completion thereof), enhancement, upgrade or repair and timing thereof; the suitability of rigs for future contracts; general market, business and industry conditions, trends and outlook; future operations; the impact of increasing regulatory complexity; expected contributions from our rig fleet expansion program and our program to high-grade the rig fleet by investing in new equipment and divesting selected assets and underutilized rigs; expense management; and the likely outcome of litigation, legal proceedings, investigations or insurance or other claims and the timing thereof.

Such statements are subject to numerous risks, uncertainties and assumptions that may cause actual results to vary materially from those indicated, including:

• downtime and other risks associated with offshore rig operations or rig relocations, including rig or equipment failure, damage and other unplanned repairs, the limited availability of transport vessels, hazards, self-imposed drilling limitations and other delays due to severe storms and hurricanes and the limited availability or high cost of insurance coverage for certain offshore perils, such as hurricanes in the Gulf of Mexico or associated removal of wreckage or debris;

• changes in worldwide rig supply and demand, competition or technology, including changes as a result of delivery of newbuild drilling rigs;

• changes in future levels of drilling activity and expenditures, whether as a result of global capital markets and liquidity, prices of oil and natural gas or otherwise, which may cause us to idle or stack additional rigs;

• governmental action, terrorism, piracy, military action and political and economic uncertainties, including uncertainty or instability resulting from civil unrest, political demonstrations, mass strikes, or an escalation or additional outbreak of armed hostilities or other crises in oil or natural gas producing areas of the Middle East, North Africa, West Africa or other geographic areas, which may result in expropriation, nationalization, confiscation or deprivation of our assets or result in claims of a force majeure situation;

• risks inherent to shipyard rig construction, repair or enhancement, including risks associated with concentration of our construction contracts with two shipyards, unexpected delays in equipment delivery and engineering or design issues following delivery, or changes in the commencement, completion or service dates;

• possible cancellation or suspension of drilling contracts as a result of mechanical difficulties, performance or other reasons;

• the outcome of litigation, legal proceedings, investigations or other claims or contract disputes, including any inability to collect receivables or resolve significant contractual or day rate disputes, any purported renegotiation, nullification, cancellation or breach of contracts with customers or other parties and any failure to negotiate or complete definitive contracts following announcements of receipt of letters of intent;

• governmental regulatory, legislative and permitting requirements affecting drilling operations, including limitations on drilling locations (such as the Gulf of Mexico during hurricane season);

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• new and future regulatory, legislative or permitting requirements, future lease sales, changes in laws, rules and regulations that have or may impose increased financial responsibility, additional oil spill abatement contingency plan capability requirements and other governmental actions that may result in claims of force majeure or otherwise adversely affect our existing drilling contracts;

• our ability to attract and retain skilled personnel on commercially reasonable terms, whether due to labor regulations, unionization or otherwise;

• environmental or other liabilities, risks or losses, whether related to storm or hurricane damage, losses or liabilities (including wreckage or debris removal), collisions, groundings, blowouts, fires, explosions and other accidents or terrorism or otherwise, for which insurance coverage and contractual indemnities may be insufficient, unenforceable or otherwise unavailable;

• our ability to obtain additional financing and pursue other business opportunities may be limited by our debt levels and debt agreement restrictions;

• our ability to realize expected benefits from the 2009 redomestication as a U.K. public limited company and the related reorganization of Ensco’s corporate structure, including the effect of any changes in laws, rules and regulations, or the interpretation thereof, or in the applicable facts, that could adversely affect our status as a non-U.S. corporation for U.S. tax purposes or otherwise adversely affect our anticipated consolidated effective income tax rate;

• delays in actual contract commencement dates;

• adverse changes in foreign currency exchange rates, including their effect on the fair value measurement of our derivative instruments; and

• potential long-lived asset or goodwill impairments.

In addition to the numerous risks, uncertainties and assumptions described above, you should also carefully read and consider "Item 1A. Risk Factors" in Part I and "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations" in Part II of our annual report on Form 10-K for the year ended December 31, 2012, which is available on the SEC's website at www.sec.gov. Each forward-looking statement speaks only as of the date of the particular statement, and we undertake no obligation to publicly update or revise any forward looking statements, except as required by law.

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PART I - FINANCIAL INFORMATION

Item 1.Financial Statements

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Shareholders

Ensco plc:

We have reviewed the condensed consolidated balance sheet of Ensco plc and subsidiaries (the Company) as of March 31, 2013, the related condensed consolidated statements of income for the three-month periods ended March 31, 2013 and 2012, the related condensed consolidated statements of comprehensive income for the three-month periods ended March 31, 2013 and 2012, and the related condensed consolidated statements of cash flows for the three-month periods ended March 31, 2013 and 2012. These condensed consolidated financial statements are the responsibility of the Company's management.

We conducted our review in accordance with the standards of the Public Company Accounting Oversight Board (United States). A review of interim financial information consists principally of applying analytical procedures and making inquiries of persons responsible for financial and accounting matters. It is substantially less in scope than an audit conducted in accordance with the standards of the Public Company Accounting Oversight Board (United States), the objective of which is the expression of an opinion regarding the financial statements taken as a whole. Accordingly, we do not express such an opinion.

Based on our review, we are not aware of any material modifications that should be made to the condensed consolidated financial statements referred to above for them to be in conformity with U.S. generally accepted accounting principles.

We have previously audited, in accordance with standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheet of Ensco plc and subsidiaries as of December 31, 2012, and the related consolidated statements of income and cash flows for the year then ended (not presented herein); and in our report dated February 21, 2013, we expressed an unqualified opinion on those consolidated financial statements. In our opinion, the information set forth in the accompanying condensed consolidated balance sheet as of December 31, 2012 is fairly stated, in all material respects, in relation to the consolidated balance sheet from which it has been derived.

/s/ KPMG LLP

Houston, Texas

April 30, 2013

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ENSCO PLC AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(In millions, except per share amounts)

(Unaudited)

	Three Months Ended March 31,
	2013			2012
OPERATING REVENUES	$	1,149.9		$	1,020.6
OPERATING EXPENSES
Contract drilling (exclusive of depreciation)	560.8			502.2
Depreciation	149.0			136.0
General and administrative	37.8			38.2
	747.6			676.4
OPERATING INCOME	402.3			344.2
OTHER INCOME (EXPENSE)
Interest income	3.3			5.9
Interest expense, net	(39.2		)	(34.6		)
Other, net	6.1			2.0
	(29.8		)	(26.7		)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	372.5			317.5
PROVISION FOR INCOME TAXES
Current income tax expense	62.2			32.3
Deferred income tax (benefit) expense	(10.5		)	4.7
	51.7			37.0
INCOME FROM CONTINUING OPERATIONS	320.8			280.5
DISCONTINUED OPERATIONS
Income (loss) from discontinued operations, net	.2			(13.1		)
Loss on disposal of discontinued operations, net	(1.1		)	—
	(.9		)	(13.1		)
NET INCOME	319.9			267.4
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(2.8		)	(2.0		)
NET INCOME ATTRIBUTABLE TO ENSCO	$	317.1		$	265.4
EARNINGS (LOSS) PER SHARE - BASIC
Continuing operations	$	1.37		$	1.21
Discontinued operations	(0.01		)	(0.06		)
	$	1.36		$	1.15
EARNINGS (LOSS) PER SHARE - DILUTED
Continuing operations	$	1.36		$	1.20
Discontinued operations	—			(0.05		)
	$	1.36		$	1.15
NET INCOME ATTRIBUTABLE TO ENSCO SHARES - BASIC AND DILUTED	$	313.8		$	262.7
WEIGHTED-AVERAGE SHARES OUTSTANDING
Basic	230.3			228.8
Diluted	230.6			229.2
CASH DIVIDENDS PER SHARE	$	0.50		$	0.375

The accompanying notes are an integral part of these condensed consolidated financial statements.

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ENSCO PLC AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(In millions)

(Unaudited)

	Three Months Ended March 31,
	2013			2012
NET INCOME	$	319.9		$	267.4
OTHER COMPREHENSIVE (LOSS) INCOME, NET
Net change in fair value of derivatives	(4.0		)	6.3
Reclassification of net gains on derivative instruments from other comprehensive income into net income	(1.0		)	(.1		)
Other	(.1		)	(1.9		)
NET OTHER COMPREHENSIVE (LOSS) INCOME	(5.1		)	4.3
COMPREHENSIVE INCOME	314.8			271.7
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(2.8		)	(2.0		)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	$	312.0		$	269.7

The accompanying notes are an integral part of these condensed consolidated financial statements.

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ENSCO PLC AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(In millions, except share and par value amounts)

	March 31, 2013			December 31, 2012
	(Unaudited)
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	561.8		$	487.1
Accounts receivable, net	809.1			811.4
Other	414.0			425.4
Total current assets	1,784.9			1,723.9
PROPERTY AND EQUIPMENT, AT COST	15,893.6			15,737.1
Less accumulated depreciation	2,738.4			2,591.5
Property and equipment, net	13,155.2			13,145.6
GOODWILL	3,274.0			3,274.0
OTHER ASSETS, NET	378.4			421.8
	$	18,592.5		$	18,565.3
LIABILITIES AND SHAREHOLDERS' EQUITY
CURRENT LIABILITIES
Accounts payable - trade	$	308.9		$	357.8
Accrued liabilities and other	489.0			584.4
Current maturities of long-term debt	47.5			47.5
Total current liabilities	845.4			989.7
LONG-TERM DEBT	4,783.3			4,798.4
DEFERRED INCOME TAXES	346.8			351.7
OTHER LIABILITIES	548.4			573.4
COMMITMENTS AND CONTINGENCIES
ENSCO SHAREHOLDERS' EQUITY
Class A ordinary shares, U.S. $.10 par value, 450.0 million shares      authorized, 237.8 million and 237.7 million shares issued	23.8			23.8
Class B ordinary shares, £1 par value, 50,000 shares authorized and issued	.1			.1
Additional paid-in capital	5,422.5			5,398.7
Retained earnings	6,635.3			6,434.7
Accumulated other comprehensive income	15.0			20.1
Treasury shares, at cost, 5.0 million shares and 5.3 million shares	(34.6		)	(31.0		)
Total Ensco shareholders' equity	12,062.1			11,846.4
NONCONTROLLING INTERESTS	6.5			5.7
Total equity	12,068.6			11,852.1
	$	18,592.5		$	18,565.3

The accompanying notes are an integral part of these condensed consolidated financial statements.

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ENSCO PLC AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(In millions)

(Unaudited)

	Three Months Ended March 31,
	2013			2012
OPERATING ACTIVITIES
Net income	$	319.9		$	267.4
Adjustments to reconcile net income to net cash provided by operating activities of continuing operations:
Discontinued operations, net	.9			13.1
Depreciation expense	149.0			136.0
Share-based compensation expense	12.8			11.7
Deferred income tax (benefit) expense	(10.5		)	4.7
Amortization of intangibles and other, net	(9.3		)	(13.1		)
Other	(7.0		)	2.7
Changes in operating assets and liabilities	(113.7		)	133.1
Net cash provided by operating activities of continuing operations	342.1			555.6
INVESTING ACTIVITIES
Additions to property and equipment	(168.3		)	(764.1		)
Other	.9			5.1
Net cash used in investing activities of continuing operations	(167.4		)	(759.0		)
FINANCING ACTIVITIES
Cash dividends paid	(116.5		)	(86.8		)
Proceeds from exercise of share options	13.4			11.9
Reduction of long-term borrowings	(7.1		)	(7.1		)
Commercial paper borrowings, net	—			75.0
Other	(5.5		)	(3.6		)
Net cash used in financing activities of continuing operations	(115.7		)	(10.6		)
DISCONTINUED OPERATIONS
Operating activities	.2			(8.3		)
Investing activities	15.5			—
Net cash provided by (used in) discontinued operations	15.7			(8.3		)
Effect of exchange rate changes on cash and cash equivalents	—			.5
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	74.7			(221.8		)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	487.1			430.7
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	561.8		$	208.9

The accompanying notes are an integral part of these condensed consolidated financial statements.

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ENSCO PLC AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Note 1 -Unaudited Condensed Consolidated Financial Statements

We prepared the accompanying condensed consolidated financial statements of Ensco plc and subsidiaries (the "Company," "Ensco," "our," "we" or "us") in accordance with accounting principles generally accepted in the United States of America ("GAAP"), pursuant to the rules and regulations of the Securities and Exchange Commission (the "SEC") included in the instructions to Form 10-Q and Article 10 of Regulation S-X. The financial information included in this report is unaudited but, in our opinion, includes all adjustments (consisting of normal recurring adjustments) that are necessary for a fair presentation of our financial position, results of operations and cash flows for the interim periods presented. The December 31, 2012 condensed consolidated balance sheet data were derived from our 2012 audited consolidated financial statements, but do not include all disclosures required by GAAP. Certain previously reported amounts have been reclassified to conform to the current year presentation. The preparation of our condensed consolidated financial statements 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.

The financial data for the three-month periods ended March 31, 2013 and 2012 included herein have been subjected to a limited review by KPMG LLP, our independent registered public accounting firm. The accompanying independent registered public accounting firm's review report is not a report within the meaning of Sections 7 and 11 of the Securities Act of 1933, and the independent registered public accounting firm's liability under Section 11 does not extend to it.

Results of operations for the three-month period ended March 31, 2013 are not necessarily indicative of the results of operations that will be realized for the year ending December 31, 2013. It is recommended that these condensed consolidated financial statements be read in conjunction with our audited consolidated financial statements and notes thereto for the year ended December 31, 2012 included in our annual report on Form 10-K filed with the SEC on February 22, 2013.

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Note 2 -Fair Value Measurements

The following fair value hierarchy table categorizes information regarding our financial assets and liabilities measured at fair value on a recurring basis (in millions):

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)		Total
As of March 31, 2013
Supplemental executive retirement plan assets	$	35.2	$	—		$	—	$	35.2
Total financial assets	$	35.2	$	—		$	—	$	35.2
Derivatives, net	$	—	$	(3.3	)	$	—	$	(3.3	)
Total financial liabilities	$	—	$	(3.3	)	$	—	$	(3.3	)
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		$	—	$	35.0

Supplemental Executive Retirement Plan Assets

Our Ensco supplemental executive retirement plans (the "SERP") are non-qualified plans that accord eligible employees an opportunity 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 condensed consolidated balance sheets. The fair value measurement of assets held in the SERP was based on quoted market prices.

Derivatives

Our derivatives were measured at fair value on a recurring basis using Level 2 inputs as of March 31, 2013 and December 31, 2012. See "Note 3 - 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 measurement of our derivatives was based on market prices that generally are observable for similar assets or liabilities at commonly-quoted intervals.

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Other Financial Instruments

The carrying values and estimated fair values of our long-term debt instruments were as follows (in millions):

	March 31, 2013				December 31, 2012
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
4.70% Senior notes due 2021	$	1,475.3	$	1,679.6	$	1,474.7	$	1,715.6
6.875% Senior notes due 2020	1,036.9		1,123.5		1,040.6		1,138.3
3.25% Senior notes due 2016	995.3		1,066.1		995.1		1,068.9
8.50% Senior notes due 2019	612.5		661.9		616.4		661.7
7.875% Senior notes due 2040	383.5		433.3		383.8		423.9
7.20% Debentures due 2027	149.0		189.3		149.0		193.2
4.33% MARAD bonds, including current maturities, due 2016	104.3		105.0		112.3		113.0
6.36% MARAD bonds, including current maturities, due 2015	38.0		41.2		38.0		41.7
4.65% MARAD bonds, including current maturities, due 2020	36.0		41.1		36.0		41.4
Total	$	4,830.8	$	5,341.0	$	4,845.9	$	5,397.7

The estimated fair values of our senior notes and debentures were determined using quoted market prices. The estimated fair values of our 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 March 31, 2013 and December 31, 2012.

Note 3 -Derivative Instruments

Our functional currency is the U.S. dollar. As is customary in the oil and gas industry, a majority of our revenues are denominated in U.S. dollars; however, a portion of the revenues earned and expenses incurred by some 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. We use foreign currency forward contracts ("derivatives") to reduce our exposure to various market risks, primarily foreign currency exchange rate risk.

All derivatives were recorded on our condensed consolidated balance sheets at fair value. Derivatives subject to legally enforceable master netting agreements were not offset in our condensed 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. Net liabilities of $3.3 million and net assets of $5.2 million associated with our foreign currency derivatives were included in our condensed consolidated balance sheets as of March 31, 2013 and December 31, 2012, respectively.  All of our derivatives mature during the next 18 months.  See "Note 2 - Fair Value Measurements" for additional information on the fair value measurement of our derivatives.

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Derivatives recorded at fair value in our condensed consolidated balance sheets consisted of the following (in millions):

	Derivative Assets				Derivative Liabilities
	March 31, 2013		December 31, 2012		March 31, 2013		December 31, 2012
Derivatives Designated as Hedging Instruments
Foreign currency forward contracts - current(1)	$	3.7	$	5.0	$	5.1	$	.3
Foreign currency forward contracts - non-current(2)	.3		.5		1.0		—
	4.0		5.5		6.1		.3
Derivatives Not Designated as Hedging Instruments
Foreign currency forward contracts - current(1)	.1		.2		1.3		.2
	.1		.2		1.3		.2
Total	$	4.1	$	5.7	$	7.4	$	.5

⁽¹⁾  Derivative assets and liabilities that have maturity dates equal to or less than twelve months from the respective balance sheet date were included in other current assets and accrued liabilities and other, respectively, on our condensed consolidated balance sheets.

⁽²⁾  Derivative assets and liabilities that have maturity dates greater than twelve months from the respective balance sheet date were included in other assets, net, and other liabilities, respectively, on our condensed 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 denominated in various currencies. As of March 31, 2013, we had cash flow hedges outstanding to exchange an aggregate $368.3 million for various foreign currencies, including $140.0 million for British pounds, $138.8 million for Brazilian reais, $35.1 million for Singapore dollars, $23.4 million for Australian dollars, $21.9 million for euros and $9.1 million for other currencies.

Gains and losses, net of tax, on derivatives designated as cash flow hedges included in our condensed consolidated statements of income and our condensed consolidated statements of comprehensive income for the three-month periods ended March 31, 2013 and 2012 were as follows (in millions):

	(Loss) Gain Recognized in Other Comprehensive Income (Effective Portion)					(Loss) Gain Reclassified  from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion)(1)					Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)(2)
	2013			2012		2013			2012		2013		2012
Interest rate lock contracts(3)	$	—		$	—	$	(.1	)	$	.1	$	—	$	—
Foreign currency forward contracts(4)	(4.0		)	6.3		1.1			—		.2		(.8		)
Total	$	(4.0	)	$	6.3	$	1.0		$	.1	$	.2	$	(.8	)

⁽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 condensed consolidated statements of income.

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⁽³⁾  Gains and losses on interest rate lock derivatives reclassified from AOCI into income (effective portion) were included in interest expense, net in our condensed consolidated statements of income.

⁽⁴⁾  During the three-month period ended March 31, 2013, $900,000 of gains were reclassified from AOCI to contract drilling expense and $200,000 of gains were reclassified from AOCI to depreciation expense in our condensed 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 March 31, 2013, we held derivatives not designated as hedging instruments to exchange an aggregate $175.8 million for various foreign currencies, including $86.1 million for euros, $23.1 million for British pounds, $17.2 million for Swiss francs, $14.2 million for Australian dollars and $35.2 million for other currencies.

Net losses of $4.4 million and net gains of $900,000 associated with our derivatives not designated as hedging instruments were included in other, net, in our condensed consolidated statements of income for the three-month periods ended March 31, 2013 and 2012, respectively.

As of March 31, 2013, the estimated amount of net gains associated with derivative instruments, net of tax, that would be reclassified to earnings during the next twelve months totaled $200,000.

Note 4 - 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 condensed consolidated balance sheets, and net income attributable to noncontrolling interests is presented separately on our condensed consolidated statements of income.

Income from continuing operations attributable to Ensco for the three-month periods ended March 31, 2013 and 2012 was as follows (in millions):

	2013			2012
Income from continuing operations	$	320.8		$	280.5
Income from continuing operations attributable to noncontrolling interests	(2.8		)	(2.0		)
Income from continuing operations attributable to Ensco	$	318.0		$	278.5

Loss from discontinued operations, net, for the three-month periods ended March 31, 2013 and 2012 was attributable to Ensco.

Note 5 - 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.

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The following table is a reconciliation of net income attributable to Ensco shares used in our basic and diluted EPS computations for the three-month periods ended March 31, 2013 and 2012 (in millions):

	2013			2012
Net income attributable to Ensco	$	317.1		$	265.4
Net income allocated to non-vested share awards	(3.3		)	(2.7		)
Net income attributable to Ensco shares	$	313.8		$	262.7

The following table is a reconciliation of the weighted-average shares outstanding used in our basic and diluted EPS computations for the three-month periods ended March 31, 2013 and 2012 (in millions):

	2013	2012
Weighted-average shares - basic	230.3	228.8
Potentially dilutive shares	.3	.4
Weighted-average shares - diluted	230.6	229.2

Antidilutive share options totaling 100,000 and 400,000 were excluded from the computation of diluted EPS for the three-month periods ended March 31, 2013 and 2012, respectively.  

Note 6 - Income Taxes

Our consolidated effective income tax rate for the three-month period ended March 31, 2013 of 13.9% included the impact of various discrete tax items, the majority of which was attributable to the recognition of a liability for unrecognized tax benefits of $4.9 million associated with a tax position taken in prior years. Excluding the impact of the aforementioned discrete tax items, our consolidated effective income tax rate for the three-month period ended March 31, 2013 was 12.2%, which is equivalent to the consolidated effective income tax rate, excluding discrete tax items, of 12.2% for the three-month period ended March 31, 2012.

Note 7 -Discontinued Operations

During the three-month period ended March 31, 2013, we sold jackup rig Pride Pennsylvania for net proceeds of $15.5 million. The proceeds were included in investing activities of discontinued operations in our condensed consolidated statement of cash flows for the three-month period ended March 31, 2013. We recognized a loss of $1.1 million in connection with the disposal, which was included in loss on disposal of discontinued operations, net in our condensed consolidated statement of income for the three-month period ended March 31, 2013. During the third quarter of 2012, we classified Pride Pennsylvania as held for sale and the rig was written down to fair value less estimated cost to sell.

Pride Pennsylvania operating results were reclassified to discontinued operations in our condensed consolidated statement of income for the three-month period ended March 31, 2012.

During 2012, we sold three jackup rigs (ENSCO 59, ENSCO 61 and Pride Hawaii), one moored semisubmersible rig (ENSCO 5003) and our last remaining barge rig (ENSCO I). The rigs' operating results were reclassified to discontinued operations in our condensed consolidated statement of income for the three-month period ended March 31, 2012.

13

The following table summarizes loss from discontinued operations for the three-month periods ended March 31, 2013 and 2012 (in millions):

	2013			2012
Revenues	$	—		$	5.8
Operating expenses	.1			21.4
Operating loss before income taxes	(.1		)	(15.6		)
Other income	.3			.5
Income tax benefit	—			2.0
Loss on disposal of discontinued operations, net	(1.1		)	—
Loss from discontinued operations	$	(.9	)	$	(13.1	)

Debt and interest expense are not allocated to our discontinued operations.

Note 8 -Contingencies

ENSCO 74 Loss

During 2008, our jackup rig 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.

In April 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 paid $14.0 million to the customer through March 31, 2013 and received $13.1 million in insurance reimbursements. Our condensed consolidated balance sheet as of March 31, 2013 included a $5.0 million liability for remaining installments due to the customer in accrued liabilities and other and a $5.9 million 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 claims remain. 

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. These matters are currently scheduled for trial in September 2013. Based on information currently available, primarily the adequacy of available defenses, we have not concluded that it is probable liabilities exist with respect to these matters.

The owner of a second 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. The matter currently is scheduled for trial in September 2013. Based on information currently available, primarily the adequacy of available defenses, we have concluded that it is remote that a liability exists with respect to this matter.

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We have liability insurance policies that provide coverage for claims such as the tanker and pipeline 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 self-insured retention for third-party claims and an annual aggregate limit of $500.0 million. 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 self-insured retention 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.

We intend to vigorously defend against these 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 the 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.

    Environmental Matters

We currently are subject to pending notices of assessment issued from 2008 to 2013 pursuant to which governmental authorities in Brazil are seeking fines in an aggregate amount of approximately $2.4 million for the release of drilling fluid from drilling rigs operating offshore Brazil. We are contesting these notices and intend to vigorously defend ourselves.  Although we do not expect the outcome of these assessments to have a material adverse effect on our financial position, operating results or cash flows, there can be no assurance as to the ultimate outcome of these assessments. A $2.4 million liability related to these matters was recorded as of March 31, 2013 and included in accrued liabilities and other on our condensed consolidated balance sheet.

We currently are subject to a pending administrative proceeding initiated during 2009 by a Spanish government authority seeking payment in an aggregate amount of approximately $4.0 million for an alleged environmental spill originating from ENSCO 5006 while it was operating offshore Spain. Our customer has posted guarantees with the Spanish government to cover potential penalties. Additionally, we expect to be indemnified for any payments resulting from this incident by our customer under the terms of the drilling contract. A criminal investigation of the incident was initiated during 2010 by a prosecutor in Tarragona, Spain, and the administrative proceedings have been suspended pending the outcome of this investigation.  We do not know at this time what, if any, involvement we may have in this investigation.

15

We intend to vigorously defend ourselves in the administrative proceeding and any criminal investigation. At this time, we are unable to predict the outcome of these matters or estimate the extent to which we may be exposed to any resulting liability. Although we do not expect the outcome of the proceedings to have a material adverse effect on our financial position, operating results or cash flows, there can be no assurance as to the ultimate outcome of the proceedings.

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.

Note 9 -Segment Information

Our business consists of three operating segments: (1) Floaters, which includes our drillships and semisubmersible rigs, (2) Jackups and (3) Other, which currently consists of management services on rigs owned by third-parties. Our two reportable segments, Floaters and Jackups, provide one service, contract drilling.

Segment information 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. Prior year information has been reclassified to conform to the current year presentation.

Three Months Ended March 31, 2013

	Floaters		Jackups		Other		Operating Segments Total		Reconciling Items			Consolidated Total
Revenues	$	719.2	$	410.5	$	20.2	$	1,149.9	$	—		$	1,149.9
Operating expenses
Contract drilling (exclusive of depreciation)	344.9		200.2		15.7		560.8		—			560.8
Depreciation	107.1		40.3		—		147.4		1.6			149.0
General and administrative	—		—		—		—		37.8			37.8
Operating income (loss)	$	267.2	$	170.0	$	4.5	$	441.7	$	(39.4	)	$	402.3
Property and equipment, net	$	10,710.0	$	2,413.3	$	—	$	13,123.3	$	31.9		$	13,155.2

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Three Months Ended March 31, 2012

	Floaters		Jackups		Other		Operating Segments Total		Reconciling Items			Consolidated Total
Revenues	$	639.3	$	359.8	$	21.5	$	1,020.6	$	—		$	1,020.6
Operating expenses
Contract drilling (exclusive of depreciation)	312.9		173.6		15.7		502.2		—			502.2
Depreciation	91.0		41.4		—		132.4		3.6			136.0
General and administrative	—		—		—		—		38.2			38.2
Operating income (loss)	$	235.4	$	144.8	$	5.8	$	386.0	$	(41.8	)	$	344.2
Property and equipment, net	$	10,390.4	$	2,457.7	$	12.4	$	12,860.5	$	29.4		$	12,889.9

Information about Geographic Areas

As of March 31, 2013, the geographic distribution of our drilling rigs by operating segment was as follows:

	Floaters	Jackups	Total(1)
North & South America (excluding Brazil)	8	14	22
Brazil	10	—	10
Europe & Mediterranean	1	8	9
Middle East & Africa	4	9	13
Asia & Pacific Rim	2	11	13
Asia & Pacific Rim (under construction)	3	3	6
Total	28	45	73

⁽¹⁾   We provide management services on three rigs owned by third-parties not included in the table above. 

Note 10 -Supplemental Financial Information

Consolidated Balance Sheet Information

Accounts receivable, net, consisted of the following (in millions):

	March 31, 2013			December 31, 2012
Trade	$	814.8		$	812.4
Other	12.2			18.2
	827.0			830.6
Allowance for doubtful accounts	(17.9		)	(19.2		)
	$	809.1		$	811.4

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Other current assets consisted of the following (in millions):

	March 31, 2013		December 31, 2012
Inventory	$	215.9	$	207.8
Prepaid taxes	60.9		62.2
Short-term investments	50.0		50.0
Deferred mobilization costs	29.6		33.7
Deferred tax assets	21.2		14.6
Prepaid expenses	14.5		20.3
Assets held for sale	—		14.2
Other	21.9		22.6
	$	414.0	$	425.4

Other assets, net, consisted of the following (in millions):

	March 31, 2013		December 31, 2012
Intangible assets	$	115.0	$	143.3
Unbilled receivables	74.9		77.1
Prepaid taxes on intercompany transfers of property	56.8		58.3
Supplemental executive retirement plan assets	35.2		29.8
Warranty and other claim receivables	30.6		30.6
Deferred tax assets	19.0		19.3
Deferred mobilization costs	12.2		20.8
Wreckage and debris removal receivables	5.9		13.2
Other	28.8		29.4
	$	378.4	$	421.8

Accrued liabilities and other consisted of the following (in millions):

	March 31, 2013		December 31, 2012
Personnel costs	$	165.6	$	231.1
Deferred revenue	142.3		146.2
Taxes	93.9		86.9
Interest	36.0		67.9
Wreckage and debris removal	5.0		9.0
Other	46.2		43.3
	$	489.0	$	584.4

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Other liabilities consisted of the following (in millions):

	March 31, 2013		December 31, 2012
Deferred revenue	$	215.7	$	224.5
Unrecognized tax benefits (inclusive of interest and penalties)	132.4		129.6
Intangible liabilities	101.9		118.0
Supplemental executive retirement plan liabilities	38.4		33.3
Personnel costs	28.4		31.6
Other	31.6		36.4
	$	548.4	$	573.4

Accumulated other comprehensive income consisted of the following (in millions):

	March 31, 2013			December 31, 2012
Derivative Instruments	$	19.4		$	24.4
Other	(4.4		)	(4.3		)
	$	15.0		$	20.1

Concentration 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 to date 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 generally 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. The terms of the ISDA agreements may also include credit support requirements, cross default provisions, termination events, or set-off provisions, in addition to a master netting agreement.  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 three-month period ended March 31, 2013, one customer in our Floaters segment provided an aggregate $200.1 million, or 17%, of our consolidated revenues.

Revenues provided by our drilling operations in the U.S. Gulf of Mexico during the three-month period ended March 31, 2013 totaled $401.5 million, or 35%, of our consolidated revenues, of which 75% were provided by our Floaters segment. Revenues provided by our drilling operations in Brazil during the three-month period ended March 31, 2013 totaled $243.3 million, or 21%, of our consolidated revenues, all of which were provided by our Floaters segment.

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Note 11 -Guarantee of Registered Securities

On May 31, 2011, Ensco plc completed a merger transaction (the "Merger") with Pride International Inc. ("Pride"). 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 8.50% unsecured senior notes due 2019, 6.875% unsecured senior notes due 2020 and 7.875% unsecured senior notes due 2040, which had an aggregate outstanding principal balance as of March 31, 2013 of $1.7 billion. 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 also is a full and unconditional guarantor of the 7.20% debentures due 2027 issued by Ensco International, Inc. in November 1997, which had an aggregate outstanding principal balance of $150.0 million as of March 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 the unaudited condensed consolidating statements of income for the three-month periods ended March 31, 2013 and 2012; the unaudited condensed consolidating statements of comprehensive income for the three-month periods ended March 31, 2013 and 2012; the condensed consolidating balance sheets as of March 31, 2013 (unaudited) and December 31, 2012; and the unaudited condensed consolidating statements of cash flows for the three-month periods ended March 31, 2013 and 2012, in accordance with Rule 3-10 of Regulation S-X.

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ENSCO PLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF INCOME Three Months Ended March 31, 2013 (in millions) (Unaudited)
	Ensco plc			ENSCO International Incorporated			Pride International, Inc.			Other Non-Guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
OPERATING REVENUES	$	5.5		$	38.1		$	—		$	1,183.7		$	(77.4	)	$	1,149.9
OPERATING EXPENSES
Contract drilling (exclusive of depreciation)	12.4			38.1			—			587.7			(77.4		)	560.8
Depreciation	.1			.8			—			148.1			—			149.0
General and administrative	16.9			.2			—			20.7			—			37.8
OPERATING (LOSS) INCOME	(23.9		)	(1.0		)	—			427.2			—			402.3
OTHER (EXPENSE) INCOME, NET	(14.6		)	(7.4		)	(14.6		)	6.8			—			(29.8		)
(LOSS) INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(38.5		)	(8.4		)	(14.6		)	434.0			—			372.5
INCOME TAX PROVISION	—			29.5			—			22.2			—			51.7
DISCONTINUED OPERATIONS, NET	—			—			—			(.9		)	—			(.9		)
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	355.6			111.7			52.4			—			(519.7		)	—
NET INCOME	317.1			73.8			37.8			410.9			(519.7		)	319.9
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—			—			—			(2.8		)	—			(2.8		)
NET INCOME ATTRIBUTABLE TO ENSCO	$	317.1		$	73.8		$	37.8		$	408.1		$	(519.7	)	$	317.1

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ENSCO PLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF INCOME Three Months Ended March 31, 2012 (in millions) (Unaudited)
	Ensco plc			ENSCO International Incorporated			Pride International, Inc.			Other Non-Guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
OPERATING REVENUES	$	21.9		$	10.6		$	—		$	1,037.0		$	(48.9	)	$	1,020.6
OPERATING EXPENSES
Contract drilling (exclusive of depreciation)	6.9			10.6			—			533.6			(48.9		)	502.2
Depreciation	.1			.8			—			135.1			—			136.0
General and administrative	14.6			—			—			23.6			—			38.2
OPERATING INCOME (LOSS)	.3			(.8		)	—			344.7			—			344.2
OTHER EXPENSE, NET	(11.2		)	(.3		)	(11.7		)	(3.5		)	—			(26.7		)
(LOSS) INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(10.9		)	(1.1		)	(11.7		)	341.2			—			317.5
INCOME TAX PROVISION	—			11.2			—			25.8			—			37.0
DISCONTINUED OPERATIONS, NET	—			—			—			(13.1		)	—			(13.1		)
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	276.3			44.2			79.7			—			(400.2		)	—
NET INCOME	265.4			31.9			68.0			302.3			(400.2		)	267.4
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—			—			—			(2.0		)	—			(2.0		)
NET INCOME ATTRIBUTABLE TO ENSCO	$	265.4		$	31.9		$	68.0		$	300.3		$	(400.2	)	$	265.4

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ENSCO PLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

Three Months Ended March 31, 2013

(in millions)

(Unaudited)

	Ensco plc		ENSCO International Incorporated			Pride International, Inc.		Other Non-Guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
NET INCOME	$	317.1	$	73.8		$	37.8	$	410.9		$	(519.7	)	$	319.9
OTHER COMPREHENSIVE (LOSS) INCOME, NET
Net change in fair value of derivatives	—		(4.0		)	—		—			—			(4.0		)
Reclassification of net gains and losses on derivative instruments from other comprehensive loss (income) into net income	—		.1			—		(1.1		)	—			(1.0		)
Other	—		—			—		(.1		)	—			(.1		)
NET OTHER COMPREHENSIVE LOSS	—		(3.9		)	—		(1.2		)	—			(5.1		)
COMPREHENSIVE INCOME	317.1		69.9			37.8		409.7			(519.7		)	314.8
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—		—			—		(2.8		)	—			(2.8		)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	$	317.1	$	69.9		$	37.8	$	406.9		$	(519.7	)	$	312.0

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ENSCO PLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

Three Months Ended March 31, 2012

(in millions)

(Unaudited)

	Ensco plc		ENSCO International Incorporated		Pride International, Inc.		Other Non-Guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
NET INCOME	$	265.4	$	31.9	$	68.0	$	302.3		$	(400.2	)	$	267.4
OTHER COMPREHENSIVE (LOSS) INCOME, NET
Net change in fair value of derivatives	—		1.9		—		4.4			—			6.3
Reclassification of net gains and losses on derivative instruments from other comprehensive loss (income) into net income	—		.1		—		(.2		)	—			(.1		)
Other	—		—		—		(1.9		)	—			(1.9		)
NET OTHER COMPREHENSIVE (LOSS) INCOME	—		2.0		—		2.3			—			4.3
COMPREHENSIVE INCOME	265.4		33.9		68.0		304.6			(400.2		)	271.7
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—		—		—		(2.0		)	—			(2.0		)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	$	265.4	$	33.9	$	68.0	$	302.6		$	(400.2	)	$	269.7

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ENSCO PLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS March 31, 2013 (in millions) (Unaudited)
	Ensco plc		ENSCO International Incorporated		Pride International, Inc.		Other Non-Guarantor Subsidiaries of Ensco		Consolidating Adjustments			Total
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	289.1	$	—	$	115.0	$	157.7	$	—		$	561.8
Accounts receivable, net	—		.3		—		808.8		—			809.1
Accounts receivable from affiliates	1,296.2		166.4		1.4		1,577.1		(3,041.1		)	—
Other	2.9		24.8		—		386.3		—			414.0
Total current assets	1,588.2		191.5		116.4		2,929.9		(3,041.1		)	1,784.9
PROPERTY AND EQUIPMENT, AT COST	2.1		30.1		—		15,861.4		—			15,893.6
Less accumulated depreciation	1.2		23.6		—		2,713.6		—			2,738.4
Property and equipment, net	.9		6.5		—		13,147.8		—			13,155.2
GOODWILL	—		—		—		3,274.0		—			3,274.0
DUE FROM AFFILIATES	2,677.0		3,758.5		1,640.4		5,125.2		(13,201.1		)	—
INVESTMENTS IN AFFILIATES	13,831.0		2,799.8		3,836.2		—		(20,467.0		)	—
OTHER ASSETS, NET	10.7		64.8		—		302.9		—			378.4
	$	18,107.8	$	6,821.1	$	5,593.0	$	24,779.8	$	(36,709.2	)	$	18,592.5
LIABILITIES AND SHAREHOLDERS' EQUITY
CURRENT LIABILITIES
Accounts payable and accrued liabilities	$	4.9	$	47.5	$	23.4	$	722.1	$	—		$	797.9
Accounts payable to affiliates	1,653.7		56.5		—		1,330.9		(3,041.1		)	—
Current maturities of long-term debt	—		—		—		47.5		—			47.5
Total current liabilities	1,658.6		104.0		23.4		2,100.5		(3,041.1		)	845.4
DUE TO AFFILIATES	1,910.0		2,260.6		954.6		8,075.9		(13,201.1		)	—
LONG-TERM DEBT	2,470.6		149.1		2,032.7		130.9		—			4,783.3
DEFERRED INCOME TAXES	—		325.2		—		21.6		—			346.8
OTHER LIABILITIES	—		1.0		10.5		536.9		—			548.4
ENSCO SHAREHOLDERS' EQUITY	12,068.6		3,981.2		2,571.8		13,907.5		(20,467.0		)	12,062.1
NONCONTROLLING INTERESTS	—		—		—		6.5		—			6.5
Total equity	12,068.6		3,981.2		2,571.8		13,914.0		(20,467.0		)	12,068.6
	$	18,107.8	$	6,821.1	$	5,593.0	$	24,779.8	$	(36,709.2	)	$	18,592.5

25

ENSCO PLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS December 31, 2012 (in millions)
	Ensco plc		ENSCO International Incorporated		Pride International, Inc.		Other Non-Guarantor Subsidiaries of Ensco		Consolidating Adjustments			Total
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	271.8	$	1.7	$	85.0	$	128.6	$	—		$	487.1
Accounts receivable, net	—		.2		—		811.2		—			811.4
Accounts receivable from affiliates	1,294.5		226.5		—		2,375.1		(3,896.1		)	—
Other	2.8		24.9		—		397.7		—			425.4
Total current assets	1,569.1		253.3		85.0		3,712.6		(3,896.1		)	1,723.9
PROPERTY AND EQUIPMENT, AT COST	2.1		30.2		—		15,704.8		—			15,737.1
Less accumulated depreciation	1.1		23.5		—		2,566.9		—			2,591.5
Property and equipment, net	1.0		6.7		—		13,137.9		—			13,145.6
GOODWILL	—		—		—		3,274.0		—			3,274.0
DUE FROM AFFILIATES	3,483.5		3,594.7		1,628.4		4,748.9		(13,455.5		)	—
INVESTMENTS IN AFFILIATES	13,469.3		2,693.8		3,824.8		—		(19,987.9		)	—
OTHER ASSETS, NET	11.3		67.4		—		343.1		—			421.8
	$	18,534.2	$	6,615.9	$	5,538.2	$	25,216.5	$	(37,339.5	)	$	18,565.3
LIABILITIES AND SHAREHOLDERS' EQUITY
CURRENT LIABILITIES
Accounts payable and accrued liabilities	$	31.0	$	28.1	$	34.1	$	849.0	$	—		$	942.2
Accounts payable to affiliates	2,364.8		136.9		—		1,394.4		(3,896.1		)	—
Current maturities of long-term debt	—		—		—		47.5		—			47.5
Total current liabilities	2,395.8		165.0		34.1		2,290.9		(3,896.1		)	989.7
DUE TO AFFILIATES	1,816.7		2,054.7		877.5		8,706.6		(13,455.5		)	—
LONG-TERM DEBT	2,469.6		149.0		2,040.8		139.0		—			4,798.4
DEFERRED INCOME TAXES	—		335.1		—		16.6		—			351.7
OTHER LIABILITIES	—		—		10.8		562.6		—			573.4
ENSCO SHAREHOLDERS' EQUITY	11,852.1		3,912.1		2,575.0		13,495.1		(19,987.9		)	11,846.4
NONCONTROLLING INTERESTS	—		—		—		5.7		—			5.7
Total equity	11,852.1		3,912.1		2,575.0		13,500.8		(19,987.9		)	11,852.1
	$	18,534.2	$	6,615.9	$	5,538.2	$	25,216.5	$	(37,339.5	)	$	18,565.3

26

ENSCO PLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS Three Months Ended March 31, 2013 (in millions) (Unaudited)
	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      operatingactivities of continuing operations	$	(55.3	)	$	(34.0	)	$	11.3	$	420.1		$	—	$	342.1
INVESTING ACTIVITIES
Additions to property and equipment	—			—			—		(168.3		)	—		(168.3		)
Other	—			.1			—		.8			—		.9
Net cash provided by (used in) investing activities of continuing operations	—			.1			—		(167.5		)	—		(167.4		)
FINANCING ACTIVITIES
Cash dividends paid	(116.5		)	—			—		—			—		(116.5		)
Proceeds from exercise of share   options	13.4			—			—		—			—		13.4
Reduction of long-term borrowings	—			—			—		(7.1		)	—		(7.1		)
Advances from (to) affiliates	179.4			32.2			18.7		(230.3		)	—		—
Other	(3.7		)	—			—		(1.8		)	—		(5.5		)
Net cash provided by (used in)          financing activities of     continuing operations	72.6			32.2			18.7		(239.2		)	—		(115.7		)
DISCONTINUED OPERATIONS
Operating activities	—			—			—		.2			—		.2
Investing activities	—			—			—		15.5			—		15.5
Net cash provided by discontinued operations	—			—			—		15.7			—		15.7
Effect of exchange rate changes on cash and cash equivalents	—			—			—		—			—		—
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	17.3			(1.7		)	30.0		29.1			—		74.7
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	271.8			1.7			85.0		128.6			—		487.1
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	289.1		$	—		$	115.0	$	157.7		$	—	$	561.8

27

ENSCO PLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS Three Months Ended March 31, 2012 (in millions) (Unaudited)
	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      operatingactivities of continuing operations	$	(20.3	)	$	(21.8	)	$	(67.4	)	$	665.1		$	—	$	555.6
INVESTING ACTIVITIES
Additions to property and   equipment	—			—			—			(764.1		)	—		(764.1		)
Other	—			.7			—			4.4			—		5.1
Net cash provided by   (used in) investing activities of     continuing operations	—			.7			—			(759.7		)	—		(759.0		)
FINANCING ACTIVITIES
Cash dividends paid	(86.8		)	—			—			—			—		(86.8		)
Commercial paper borrowings,   net	75.0			—			—			—			—		75.0
Proceeds from exercise of share   options				11.9			—			—			—		11.9
Reduction of long-term borrowings	—			—			—			(7.1		)	—		(7.1		)
Advances (to) from affiliates	(192.3		)	22.8			74.1			95.4			—		—
Other	—			(.1		)	—			(3.5		)	—		(3.6		)
Net cash (used in) provided by          financing activities of   continuing operations	(204.1		)	34.6			74.1			84.8			—		(10.6		)
DISCONTINUED OPERATIONS
Operating activities	—			—			—			(8.3		)	—		(8.3		)
Net cash used in discontinued operations	—			—			—			(8.3		)	—		(8.3		)
Effect of exchange rate changes   on cash and cash equivalents	—			—			—			.5			—		.5
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(224.4		)	13.5			6.7			(17.6		)	—		(221.8		)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	236.6			—			22.6			171.5			—		430.7
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	12.2		$	13.5		$	29.3		$	153.9		$	—	$	208.9

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Item 2.  Management's Discussion and Analysis of Financial Condition and Results of Operations

Management's Discussion and Analysis of Financial Condition and Results of Operations should be read in conjunction with the accompanying unaudited condensed consolidated financial statements as of March 31, 2013 and for the three-month periods ended March 31, 2013 and 2012 included elsewhere herein, and with our annual report on Form 10-K for the year ended December 31, 2012. The following discussion and analysis contains forward-looking statements that involve risks and uncertainties. Our actual results may differ materially from those anticipated in these forward-looking statements as a result of certain factors, including those set forth under “Risk Factors” in Item 1A of our annual report. See “Forward-Looking Statements.”

EXECUTIVE SUMMARY

Ensco owns the world's second largest offshore drilling rig fleet amongst competitive rigs. We have assembled the newest ultra-deepwater fleet and largest active premium jackup fleet of any offshore drilling company. We currently own and operate an offshore drilling rig fleet of 74 rigs, including rigs under construction. Our fleet includes nine drillships, 19 semisubmersible rigs and 46 independent leg jackups.

Brent crude oil prices remained between $105 and $120 per barrel during the first quarter of 2013. Although recent prices declined to below $100 per barrel, we believe current prices support drilling programs by operators in the floater and jackup markets. In response to continued customer demand, we recently entered into an agreement with Keppel FELS Limited ("KFELS") to construct a premium jackup (ENSCO 110), which is scheduled for delivery during the first quarter of 2015. We currently have seven rigs under construction, including three ultra-deepwater drillships, three ultra-premium harsh environment jackup rigs and the ENSCO 110 premium jackup rig as part of our ongoing strategy to expand and high-grade our fleet.

A substantial portion of our projected cash flow will continue to be invested in the expansion and enhancement of our fleet of drilling rigs and returned to shareholders through our $2.00 per share annual dividend. We believe our strong balance sheet, $12.0 billion of contract backlog and borrowing capacity under our revolving credit facilities and commercial paper program will provide flexibility to make additional investments in our fleet and sustain an adequate level of liquidity during the remainder of 2013 and beyond.

BUSINESS ENVIRONMENT

Floaters

The floater market remained strong during the first quarter of 2013 and tender activity continues to increase. Marketed utilization remained high, at 96%, and marketed utilization for ultra-deepwater floaters was 99%.

In West Africa, marketed utilization for ultra-deepwater floaters was 97%, and recent day rates continued to exceed $600,000. Tender activity remains strong and is expected to support current utilization levels and day rates in the region through the remainder of 2013. The majority of recent tenders are for projects of at least three years, which are due to start in late 2013 and early 2014. Seven drillships and one semisubmersible rig are scheduled to enter the market before the end of 2013; however, the majority of these rigs are contracted and are expected to have little impact on the current supply shortage in the region. Angola, Gabon and Ghana continue to present new drilling opportunities.

Marketed utilization in the U.S. Gulf of Mexico was 95%, and ultra-deepwater floaters were fully utilized. The U.S. Gulf of Mexico market is expected to remain active during 2013 and into 2014 as multiple operators will begin drilling programs during the next twelve months. With limited rig availability in the region, we expect a tight market for the remainder of 2013.

29

In Brazil, marketed utilization was 100% for ultra-deepwater floaters as Petrobras ramps up drilling for pre-salt reserves. Brazil has scheduled a May 2013 lease sale, the first since the announcement of the pre-salt discoveries. We believe this lease sale will result in incremental demand in Brazil as independent oil companies come to the market for rigs to drill their new exploration acreage.

In Mexico, Petróleos Mexicanos ("PEMEX"), the national oil company of Mexico, is expanding its floater drilling program, and we expect the Asia Pacific market to remain strong with incremental requirements in Indonesia, Malaysia and Australia.

Worldwide rig supply in the floater market continues to increase as a result of newbuild construction programs. It has been reported that over 90 newbuild drillships and semisubmersible rigs currently are under construction, 21 of which are scheduled for delivery during the remainder of 2013. The majority of newbuild floater rigs scheduled for delivery during the remainder of 2013 are contracted, and we expect these newbuild floater rigs to be absorbed into the market without a significant effect on utilization levels and day rates.

Jackups

The jackup market continued to tighten during the first quarter of 2013, putting upward pressure on day rates. Tender activity remained high, and the number of warm stacked rigs reached a record low. The recent increase in the length of contracts is expected to have a positive impact on future day rates.

In the U.S. Gulf of Mexico, marketed utilization was 87%, and multiple operators are actively discussing upcoming programs with contractors and developing plans for the latter part of year. We expect the U.S. Gulf of Mexico market to remain strong during the remainder of 2013 and into 2014 given the limited rig supply.

In the Middle East, strong demand prompted the reactivation of three jackups in the region. Tender activity was strong during the first quarter, and we expect this trend to continue for the remainder of the year. Any excess capacity in the region will likely be absorbed by incremental rig requirements.

Several new contracts were announced in the Asia Pacific region during the first quarter. The market continues to support increases in day rates, and a number of new jackups from outside the region are being offered in current tenders. The Asia Pacific market is expected to remain tightly balanced during 2013, even after considering newbuild jackups that will be delivered during the year.

Marketed utilization in the North Sea was 97%. Day rates have increased due to customer demand, and we expect limited rig availability through the end of 2014. In Mexico, a strong market is expected to continue as PEMEX plans to add incremental rigs to its existing contracted fleet. Additional drilling opportunities exist in India, Argentina and Venezuela.

Worldwide rig supply in the jackup market continues to increase as a result of newbuild construction programs. It has been reported that over 100 newbuild jackup rigs are under construction, over 45 of which are scheduled for delivery during the remainder of 2013. Less than half of the newbuild jackup rigs scheduled for delivery during the remainder of 2013 are contracted; however, current and expected tenders indicate that the newbuild jackup rigs will be absorbed into the market without a significant effect on currently marketed rig utilization levels and day rates.

30

RESULTS OF OPERATIONS

The following table summarizes our condensed consolidated results of operations for the three-month periods ended March 31, 2013 and 2012 (in millions):

	2013			2012
Revenues	$	1,149.9		$	1,020.6
Operating expenses
Contract drilling (exclusive of depreciation)	560.8			502.2
Depreciation	149.0			136.0
General and administrative	37.8			38.2
Operating income	402.3			344.2
Other expense, net	(29.8		)	(26.7		)
Provision for income taxes	51.7			37.0
Income from continuing operations	320.8			280.5
Loss from discontinued operations, net	(0.9		)	(13.1		)
Net income	319.9			267.4
Net income attributable to noncontrolling interests	(2.8		)	(2.0		)
Net income attributable to Ensco	$	317.1		$	265.4

For the three-month period ended March 31, 2013, revenues and operating income increased$129.3 million, or 13%, and $58.1 million, or 17%, respectively, as compared to the prior year quarter. The increase in revenues and operating income was primarily due to the addition of newbuild rigs to our Floaters segment and an increase in average day rates for our Jackups segment. The increase was partially offset by a slight decline in utilization across our fleet. See below for additional information on our results by segment.

A significant number of our drilling contracts are of a long-term nature. Accordingly, an increase or decline in demand for contract drilling services generally affects our operating results and cash flows gradually over future quarters as long-term contracts expire and new contracts and/or options are priced at current market rates.

Rig Counts, Utilization and Average Day Rates

The following table summarizes our offshore drilling rigs by reportable segment and rigs under construction as of March 31, 2013 and 2012:

	2013	2012
Floaters(1)	25	24
Jackups	42	42
Under construction(1)(2)(3)	6	5
Total(4)	73	71

⁽¹⁾  ENSCO 8506 was delivered during the third quarter of 2012 and commenced drilling operations in the U.S. Gulf of Mexico under a long-term contract during the first quarter of 2013.

⁽²⁾  During the second quarter of 2012, we entered into agreements with Samsung Heavy Industries ("SHI") to construct our sixth and seventh ultra-deepwater drillships (ENSCO DS-8 and ENSCO DS-9). The rigs are uncontracted and scheduled for delivery during the second half of 2014.

31

⁽³⁾  We entered into an agreement with KFELS in April 2013 to construct a new premium jackup rig (ENSCO 110), which is scheduled for delivery during the first quarter of 2015. ENSCO 110 is not included in the table above.

⁽⁴⁾  The total number of rigs for each period excludes rigs reclassified as discontinued operations. 

The following table summarizes our rig utilization and average day rates by reportable segment for the three-month periods ended March 31, 2013 and 2012:

	2013			2012
Rig utilization(1)
Floaters	83		%	85		%
Jackups	88		%	91		%
Total	86		%	89		%
Average day rates(2)
Floaters	$	379,801		$	349,942
Jackups	117,268			99,618
Total	$	209,824		$	182,462

⁽¹⁾  Rig utilization is derived by dividing the number of days under contract by the number of days in the period. Days under contract equals the total number of days that rigs have earned a day rate, including days associated with compensated downtime and mobilizations. For newly constructed or acquired rigs, the number of days in the period begins upon commencement of drilling operations for rigs with a contract or when the rig becomes available for drilling operations for rigs without a contract.

⁽²⁾  Average day rates are derived by dividing contract drilling revenues, adjusted to exclude certain types of non-recurring reimbursable revenues, lump sum revenues and revenues attributable to amortization of drilling contract intangibles, as discussed in Note 9 to our audited consolidated financial statements for the year ended December 31, 2012 included in our annual report on Form 10-K, by the aggregate number of contract days, adjusted to exclude contract days associated with certain mobilizations, demobilizations, shipyard contracts and standby contracts.

Detailed explanations of our operating results, including discussions of revenues, contract drilling expense and depreciation expense by segment, are provided below.

Operating Income

Our business consists of three operating segments: (1) Floaters, which includes our drillships and semisubmersible rigs, (2) Jackups and (3) Other, which currently consists of management services on rigs owned by third-parties. Our two reportable segments, Floaters and Jackups, provide one service, contract drilling.

Segment information 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." Prior year information has been reclassified to conform to the current year presentation.

32

Three Months Ended March 31, 2013

	Floaters		Jackups		Other		Operating Segments Total		Reconciling Items			Consolidated Total
Revenues	$	719.2	$	410.5	$	20.2	$	1,149.9	$	—		$	1,149.9
Operating expenses
Contract drilling (exclusive of depreciation)	344.9		200.2		15.7		560.8		—			560.8
Depreciation	107.1		40.3		—		147.4		1.6			149.0
General and administrative	—		—		—		—		37.8			37.8
Operating income (loss)	$	267.2	$	170.0	$	4.5	$	441.7	$	(39.4	)	$	402.3

Three Months Ended March 31, 2012

	Floaters		Jackups		Other		Operating Segments Total		Reconciling Items			Consolidated Total
Revenues	$	639.3	$	359.8	$	21.5	$	1,020.6	$	—		$	1,020.6
Operating expenses
Contract drilling (exclusive of depreciation)	312.9		173.6		15.7		502.2		—			502.2
Depreciation	91.0		41.4		—		132.4		3.6			136.0
General and administrative	—		—		—		—		38.2			38.2
Operating income (loss)	$	235.4	$	144.8	$	5.8	$	386.0	$	(41.8	)	$	344.2

Floaters

Floaters revenues for the three-month period ended March 31, 2013 increased by $79.9 million, or 12%, as compared to the prior year quarter. The increase in revenues was primarily due to commencement of ENSCO 8505 drilling operations during the second quarter of 2012 and commencement of ENSCO 8506 and ENSCO DS-6 drilling operations during the first quarter of 2013. These increases were partially offset by a decline in utilization due to downtime prompted by a vendor notice regarding inspection and replacement of connector bolts on various rigs and ENSCO 5005, which was in the shipyard during the three-month period ended March 31, 2013.

Floaters contract drilling expense increased by $32.0 million, or 10%, as compared to the prior year quarter primarily due to the aforementioned additions to our fleet and increased personnel costs. Depreciation expense increased by $16.1 million, or 18%, primarily due to the additions to our Floaters fleet.

Jackups

Jackups revenues for the three-month period ended March 31, 2013 increased by $50.7 million, or 14%, as compared to the prior year quarter. The increase in revenues was primarily due to an increase in average day rates, mostly attributable to the U.S. Gulf of Mexico, North Sea and Southeast Asia region. The increase in average day rates was partially offset by a decline in utilization due to an increase in shipyard days.

Jackups contract drilling expense increased $26.6 million, or 15%, primarily due to increased personnel costs and, to a lesser extent, increased repair and maintenance expense.

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Other Income (Expense)

The following table summarizes other income (expense) for the three-month periods ended March 31, 2013 and 2012 (in millions):

	2013			2012
Interest income	$	3.3		$	5.9
Interest expense, net:
Interest expense	(56.8		)	(57.6		)
Capitalized interest	17.6			23.0
	(39.2		)	(34.6		)
Other, net	6.1			2.0
	$	(29.8	)	$	(26.7	)

Interest income for the three-month period ended March 31, 2013 declined as compared to the prior year quarter primarily due to declining outstanding principal amounts due from customers for reimbursement of mobilization and upgrade costs on certain long-term drilling contracts. Interest expense was comparable to the prior year quarter as our outstanding principal debt balances associated with our long-term debt instruments remained consistent with the prior year quarter. Interest expense capitalized during the three-month period ended March 31, 2013 declined as compared to the prior year quarter due to a decline in the average outstanding amount of capital invested in newbuild construction. ENSCO 8505 was placed into service during the second quarter of 2012, and ENSCO 8506 and ENSCO DS-6 were placed into service during the first quarter of 2013.

Our functional currency is the U.S. dollar, and 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. A net foreign currency exchange gain of $5.1 million, primarily attributable to the devaluation of the Venezuelan Bolivar, was included in other, net, for the three-month period ended March 31, 2013. Other, net for the three-month period ended March 31, 2012 included a net foreign currency exchange loss of $700,000, which was more than offset by other income.

Provision for Income Taxes

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. Income tax rates imposed in the tax jurisdictions in which our subsidiaries conduct operations vary, as does the tax base to which the rates are applied. In some cases, tax rates may be applicable to gross revenues, statutory or negotiated deemed profits or other bases utilized under local tax laws, rather than to net income. Our drilling rigs frequently move from one taxing jurisdiction to another to perform contract drilling services. In some instances, the movement of drilling rigs among taxing jurisdictions will involve the transfer of ownership of the drilling rigs among our subsidiaries. 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.

Income tax expense was $51.7 million and $37.0 million for the three-month periods ended March 31, 2013 and 2012, respectively. The $14.7 million increase in income tax expense as compared to the prior year quarter was primarily due to increased profitability and the impact of various discrete tax items recognized during the three-month period ended March 31, 2013, including $4.9 million for the recognition of a liability for unrecognized tax benefits associated with a tax position taken in prior years.

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Discontinued Operations

During the three-month period ended March 31, 2013, we sold jackup rig Pride Pennsylvania for net proceeds of $15.5 million. The proceeds were included in investing activities of discontinued operations in our condensed consolidated statement of cash flows for the three-month period ended March 31, 2013. We recognized a loss of $1.1 million in connection with the disposal, which was included in loss on disposal of discontinued operations, net in our condensed consolidated statement of income for the three-month period ended March 31, 2013. During the third quarter of 2012, we classified Pride Pennsylvania as held for sale and the rig was written down to fair value less estimated cost to sell.

Pride Pennsylvania operating results were reclassified to discontinued operations in our condensed consolidated statement of income for the three-month period ended March 31, 2012.

During 2012, we sold three jackup rigs (ENSCO 59, ENSCO 61 and Pride Hawaii), one moored semisubmersible rig (ENSCO 5003) and our last remaining barge rig (ENSCO I). The rigs' operating results were reclassified to discontinued operations in our condensed consolidated statement of income for the three-month period ended March 31, 2012.

LIQUIDITY AND CAPITAL RESOURCES

Although our business is cyclical, we have historically relied on our cash flow from continuing operations to meet liquidity needs and fund the majority of our cash requirements. We have maintained a strong financial position through the disciplined and conservative use of debt, which has provided us the ability to achieve future growth potential through acquisitions and newbuild rig construction. A substantial portion of our cash flow has been invested in the expansion and enhancement of our fleet of drilling rigs, primarily through newbuild construction, and return of capital to shareholders, primarily through dividend payments. We expect that our current cash and cash equivalents and future operating cash flows will continue to be dedicated to newbuild construction and dividend payments in the near-term.

During the three-month period ended March 31, 2013, our primary source of cash was $342.1 million generated from operating activities of continuing operations and $15.5 million in proceeds from the sale of Pride Pennsylvania. Our primary use of cash for the same period was $168.3 million for the construction, enhancement and other improvement of our drilling rigs and $116.5 million for dividend payments.

During the three-month period ended March 31, 2012, our primary source of cash was $555.6 million generated from operating activities of continuing operations and $75.0 million in net proceeds from our commercial paper program. Our primary use of cash for the same period was $764.1 million for the construction, enhancement and other improvement of our drilling rigs, including $611.2 million invested in newbuild construction, and $86.8 million for dividend payments.

Cash Flow and Capital Expenditures

Our cash flow from operating activities of continuing operations and capital expenditures for the three-month periods ended March 31, 2013 and 2012 were as follows (in millions):

	2013		2012
Cash flow from operating activities of continuing operations	$	342.1	$	555.6
Capital expenditures
New rig construction	$	50.8	$	611.2
Rig enhancements	66.0		94.9
Minor upgrades and improvements	51.5		58.0
	$	168.3	$	764.1

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Cash flow from operating activities of continuing operations declined$213.5 million, or 38%, for the three-month period ended March 31, 2013 as compared to the prior year period. The decline primarily resulted from a $161.2 million increase in cash payments related to contract drilling expenses, a $36.6 million decline in cash receipts resulting from the sale of trading securities during the prior year period, a $26.5 million increase in cash payments related to general and administrative expenses and a $24.2 million increase in income tax payments, partially offset by a $50.7 million increase in cash receipts from contract drilling services.

Cash payments during the three-month period ended March 31, 2013 related to contract drilling and general and administrative expenses were generally higher than the comparable prior year period primarily due to the full year impact of the Pride acquisition on certain annual payments made during the three-month period ended March 31, 2013. Annual payments made during the three-month period ended March 31, 2012 were based on seven months of acquired company operating activity.

Cash receipts from contract drilling services for the three-month period ended March 31, 2012 included $80.0 million associated with customer reimbursed capital upgrade projects which are amortized to revenue over the term of the related drilling contract. The $36.6 million in cash receipts from the sale of trading securities during the three-month period ended March 31, 2012 was in connection with the resolution of certain litigation in respect of our Seahawk Drilling, Inc. bankruptcy claims.

We remain focused on our long-established strategy of high-grading and expanding the size of our fleet. We currently have three ultra-deepwater drillships (ENSCO DS-7, ENSCO DS-8 and ENSCO DS-9) under construction with scheduled delivery dates during the third quarter of 2013, third quarter of 2014 and fourth quarter of 2014, respectively. ENSCO DS-7 is expected to commence drilling operations under a long-term contract in Angola during the fourth quarter of 2013 while ENSCO DS-8 and ENSCO DS-9 are currently uncontracted.

We also have three ultra-high specification harsh environment jackup rigs (ENSCO 120, ENSCO 121 and ENSCO 122) under construction. These rigs are scheduled for delivery during the third quarter and fourth quarter of 2013 and the second half of 2014, respectively. ENSCO 120 and ENSCO 121 are committed under long-term drilling contracts in the North Sea and expected to commence drilling operations during the fourth quarter of 2013 and the first quarter of 2014, respectively. ENSCO 122 is currently uncontracted.

In April 2013, we entered into an agreement with KFELS to construct a new premium jackup rig (ENSCO 110) for estimated total construction costs of approximately $225 million, inclusive of costs associated with commissioning, systems integration testing and project management. ENSCO 110 is based on the same design as ENSCO 106, ENSCO 107 and ENSCO 108 and is scheduled for delivery during the first quarter of 2015.

We have significant contractual commitments related to our newbuild construction agreements. We expect to fund these commitments from our cash and cash equivalents, future operating cash flows and, if necessary, funds borrowed under our commercial paper program, credit facilities or other future financing arrangements.  The actual timing of our contractual construction payments may vary based on the completion of various construction milestones, which, to a large extent, are beyond our control. 

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The following table summarizes the aggregate amount of contractual payments made as of March 31, 2013 and estimated timing of our remaining contractual payments (in millions):

	Cumulative Paid		2013		2014		2015		Total(1)
ENSCO DS-7	$	149.4	$	357.0	$	—	$	—	$	506.4
ENSCO DS-8	53.8		107.6		377.0		—		538.4
ENSCO DS-9	52.5		104.9		367.6		—		525.0
ENSCO 110	—		41.0		—		164.0		205.0
ENSCO 120	43.8		178.0		—		—		221.8
ENSCO 121	43.8		176.7		—		—		220.5
ENSCO 122	49.0		—		197.6		—		246.6
	$	392.3	$	965.2	$	942.2	$	164.0	$	2,463.7

⁽¹⁾  Total commitments are based on fixed-price shipyard construction contracts, exclusive of costs associated with commissioning, systems integration testing, project management, capitalized interest, inventory and other spares.

Based on our current projections, we expect capital expenditures during 2013 to include approximately $1.2 billion for newbuild construction, approximately $320 million for rig enhancement projects and approximately $250 million for minor upgrades and improvements. Depending on market conditions and future opportunities, we may make additional capital expenditures to upgrade rigs for customer requirements and construct or acquire additional rigs.

Financing and Capital Resources

Our total debt, total capital and total debt to total capital ratios are summarized below (in millions, except percentages):

	March 31, 2013			December 31, 2012
Total debt	$	4,830.8		$	4,845.9
Total capital*	$	16,892.9		$	16,692.3
Total debt to total capital	28.6		%	29.0		%

  *Total capital consists of total debt and Ensco shareholders' equity.

 Senior Notes

As of March 31, 2013, we had outstanding $1.0 billion aggregate principal amount of unsecured 3.25% senior notes due 2016, $500.0 million aggregate principal amount of unsecured 8.5% senior notes due 2019, $900.0 million aggregate principal amount of unsecured 6.875% senior notes due 2020, $1.5 billion aggregate principal amount of unsecured 4.7% senior notes due 2021 and $300.0 million aggregate principal amount of unsecured 7.875% senior notes due 2040. We make semiannual interest payments on each of the aforementioned notes.

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Revolving Credit

We have a $450.0 million revolving unsecured credit facility with a 364-day term, expiring in May 2013, to be used for general corporate purposes and as a backstop to our commercial paper program ("the 364-Day Credit Facility"). Upon our election prior to maturity, amounts outstanding under the 364-Day Credit Facility may be converted into a term loan with a maturity date of May 9, 2014 after payment of a fee equal to 1% of the amounts converted. Advances under the 364-Day Credit Facility bear interest at LIBOR plus an applicable margin rate (currently 1.125% per annum) depending on our credit rating. We are required to pay a quarterly undrawn facility fee (currently 0.09% per annum) on the total $450.0 million commitment. We have the right, subject to lender consent, to increase the commitments under the 364-Day Credit Facility to an aggregate amount of up to $550.0 million. We had no amounts outstanding under the 364-Day Credit Facility as of March 31, 2013 and December 31, 2012. We intend to let the 364-Day Credit Facility expire upon maturity in May 2013.

We have a $1.45 billion revolving unsecured credit facility with a five-year term, expiring in May 2016, to be used for general corporate purposes and as a backstop to our commercial paper program ("the Five-Year Credit Facility"). Advances under the Five-Year Credit Facility bear interest at LIBOR plus an applicable margin rate (currently 1.5% per annum), depending on our credit rating. We are required to pay a quarterly undrawn facility fee (currently 0.2% per annum) on the total $1.45 billion commitment, which is also based on our credit rating. 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 $1.7 billion. We had no amounts outstanding under the Five-Year Credit Facility as of March 31, 2013 and December 31, 2012. In connection with the expiration of our 364-Day Credit Facility, we are in negotiations with certain financial institutions to refinance the Five-Year Credit Facility and increase our existing $1.45 billion borrowing capacity.

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 364-Day and Five-Year Credit Facilities (the "Credit Facilities"). 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 Credit Facilities. The proceeds of such financings will be used for capital expenditures and other general corporate purposes. The commercial paper will bear interest at rates that vary based on market conditions and the ratings assigned by credit rating agencies at the time of issuance. The commercial paper maturities will vary but may not exceed 364 days from the date of issuance. 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 March 31, 2013 and December 31, 2012.

Other Financing

We filed an immediately effective Form S-3 Registration Statement with the U.S. Securities and Exchange Commission ("SEC") on January 13, 2012, which provides us the ability to issue debt securities, equity securities, guarantees and/or units of securities in one or more offerings. The registration statement, as amended, expires in January 2015.

As of March 31, 2013, we had an aggregate $178.3 million outstanding under our Maritime Administration bond issues that require semiannual principal and interest payments due in 2015, 2016 and 2020, respectively. We also make semiannual interest payments on $150.0 million of 7.2% debentures due in 2027.

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In connection with the termination of our American Depositary Share ("ADS") facility and conversion to Class A ordinary shares during the second quarter of 2012, our previously executed share repurchase agreements with two investment banks became of no effect by their own terms. Accordingly, our share repurchase program, which provided for the repurchase of Ensco ADSs, ended. The establishment of a new share repurchase program requires approval from our shareholders by special resolution. We are presenting our shareholders with a proposal to establish a new share repurchase program for up to a maximum of $2 billion in the aggregate at our May 2013 annual general meeting. If approved, the share repurchase program will provide added flexibility to return capital to shareholders after consideration of other uses of cash flow, including investment in our fleet of drilling rigs and dividend increases.

Liquidity

Our liquidity position is summarized in the table below (in millions, except ratios):

	March 31, 2013		December 31, 2012
Cash and cash equivalents	$	561.8	$	487.1
Short-term investments	$	50.0	$	50.0
Working capital	$	939.5	$	734.2
Current ratio	2.1		1.7

We expect to fund our short-term liquidity needs, including contractual obligations and anticipated capital expenditures, as well as any dividends or working capital requirements, from our cash and cash equivalents, short-term investments, operating cash flow and, if necessary, funds borrowed under our Credit Facilities and/or under our commercial paper program.

We expect to fund our long-term liquidity needs, including contractual obligations, anticipated capital expenditures and dividends, from our operating cash flow, and, if necessary, funds borrowed under our Five-Year Credit Facility or other future financing arrangements. We may decide to access debt and/or equity markets to raise additional capital or increase liquidity as necessary.

Effects of Climate Change and Climate Change Regulation

Greenhouse gas ("GHG") emissions have increasingly become the subject of international, national, regional, state and local attention. During 2009, the United States Environmental Protection Agency (the "EPA") officially published its findings that emissions of carbon dioxide, methane and other GHGs present an endangerment to human health and the environment because emissions of such gases are, according to the EPA, contributing to warming of the earth's atmosphere and other climatic changes. These EPA findings allowed the agency to proceed with the adoption and implementation of regulations to restrict GHG emissions under existing provisions of the Clean Air Act that establish Prevention of Significant Deterioration ("PSD") construction and Title V operating permit reviews for certain large stationary sources that are potential major sources of GHG emissions. Facilities required to obtain PSD permits for their GHG emissions also will be required to meet "best available control technology" standards to be established by the states or, in some cases, the EPA, on a case-by-case basis. The EPA has also adopted rules requiring annual monitoring and reporting of GHG emissions from specified sources in the United States, including, among others, certain onshore and offshore oil and natural gas production facilities.

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In recent years, cap and trade initiatives to limit GHG emissions have been introduced in the European Union. Similarly, a number of bills related to climate change have been introduced in the U.S. Congress. If these or similar bills were to be adopted, such legislation could adversely impact many industries. However, it appears unlikely that comprehensive federal climate legislation will be passed by Congress in the foreseeable future. In the absence of federal legislation, almost half of the states have begun to address GHG emissions, primarily through the planned development of emission inventories or regional GHG cap and trade programs. Future regulation of GHG emissions could occur pursuant to future treaty obligations, statutory or regulatory changes or new climate change legislation in the jurisdictions in which we operate. If Congress undertakes comprehensive tax reform in the coming year, it is possible that such reform may include a carbon tax, which could impose additional direct costs on operations and reduce demand for refined products. Depending on the particular program, we, or our customers, could be required to control GHG emissions or to purchase and surrender allowances for GHG emissions resulting from our operations. It is uncertain whether any of these initiatives will be implemented. If such initiatives are implemented, we do not believe that such initiatives would have a direct, material adverse effect on our financial condition, operating results or cash flows.

Restrictions on GHG emissions or other related legislative or regulatory enactments could have an indirect effect in those industries that use significant amounts of petroleum products, which could potentially result in a reduction in demand for petroleum products and, consequently, our offshore contract drilling services. We are currently unable to predict the manner or extent of any such effect. Furthermore, one of the long-term physical effects of climate change may be an increase in the severity and frequency of adverse weather conditions, such as hurricanes, which may increase our insurance costs or risk retention, limit insurance availability or reduce the areas in which, or the number of days during which, our customers would contract for our drilling rigs in general and in the Gulf of Mexico in particular. We are currently unable to predict the manner or extent of any such effect.

MARKET RISK

We use derivatives to reduce our exposure to foreign currency exchange rate risk. 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. 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 may employ an interest rate risk management strategy that utilizes derivative instruments to mitigate or eliminate unanticipated fluctuations in earnings and cash flows arising from changes in, and volatility of, interest rates.

We utilize cash flow hedges to hedge forecasted foreign currency denominated transactions, primarily to reduce our exposure to foreign currency exchange rate risk on future expected contract drilling expenses denominated in various foreign currencies. 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. As of March 31, 2013, we had cash flow hedges outstanding to exchange an aggregate $368.3 million for various foreign currencies.

We have net assets and liabilities denominated in numerous foreign currencies and use various strategies to manage our exposure to changes in foreign currency exchange rates. We occasionally use derivatives to match foreign currency denominated liabilities with equal or near equal amounts of foreign currency denominated assets, thereby minimizing exposure to earnings fluctuations caused by changes in foreign currency exchange rates. We 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 March 31, 2013, we held derivatives not designated as hedging instruments outstanding to exchange an aggregate $175.8 million for various foreign currencies.

If we were to incur a hypothetical 10% adverse change in foreign currency exchange rates, net unrealized losses associated with our foreign currency denominated assets and liabilities as of March 31, 2013 would approximate $23.5 million. Approximately $13.6 million of these unrealized losses would be offset by corresponding gains on the derivatives utilized to offset changes in the fair value of net assets and liabilities denominated in foreign currencies.

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We utilize derivatives and undertake foreign currency exchange rate hedging activities in accordance with our established policies for the management of market risk. 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 generally 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, in addition to a master netting agreement. 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.

We do not enter into derivatives for trading or other speculative purposes. We believe that our use of derivatives and related hedging activities reduces our exposure to foreign currency exchange rate risk and does not expose us to material credit risk or any other material market risk. All of our derivatives mature during the next 18 months.  See Note 3 to our condensed consolidated financial statements for additional information on our derivative instruments.

CRITICAL ACCOUNTING POLICIES

The preparation of financial statements and related disclosures in conformity with accounting principles generally accepted in the United States of America requires our management to make estimates, judgments and assumptions that affect the amounts reported in our consolidated financial statements and accompanying notes. Our significant accounting policies are included in Note 1 to our audited consolidated financial statements for the year ended December 31, 2012 included in our annual report on Form 10-K filed with the SEC on February 22, 2013. These policies, along with our underlying judgments and assumptions made in their application, have a significant impact on our consolidated financial statements. We identify our critical accounting policies as those that are the most pervasive and important to the portrayal of our financial position and operating results and that require the most difficult, subjective and/or complex judgments by management regarding estimates in matters that are inherently uncertain. Our critical accounting policies are those related to property and equipment, impairment of long-lived assets and goodwill and income taxes.

Property and Equipment

As of March 31, 2013, the carrying value of our property and equipment totaled $13.2 billion, which represented 71% of total assets. This carrying value reflects the application of our property and equipment accounting policies, which incorporate management's estimates, judgments and assumptions relative to the capitalized costs, useful lives and salvage values of our rigs.

We develop and apply property and equipment accounting policies that are designed to appropriately and consistently capitalize those costs incurred to enhance, improve and extend the useful lives of our assets and expense those costs incurred to repair or maintain the existing condition or useful lives of our assets. The development and application of such policies requires estimates, judgments and assumptions by management relative to the nature of, and benefits from, expenditures on our assets. We establish property and equipment accounting policies that are designed to depreciate our assets over their estimated useful lives. The judgments and assumptions used by management in determining the useful lives of our property and equipment reflect both historical experience and expectations regarding future operations, utilization and performance of our assets. The use of different estimates, judgments and assumptions in the establishment of our property and equipment accounting policies, especially those involving the useful lives of our rigs, would likely result in materially different asset carrying values and operating results.

For additional information on the useful lives of our drilling rigs, including an analysis of the impact of various changes in useful life assumptions, see "Item 7. Management's Discussion and Analysis of Financial Condition and

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Results of Operations - Critical Accounting Policies and Estimates" in Part II of our annual report on Form 10-K for the year ended December 31, 2012.

Impairment of Long-Lived Assets and Goodwill

We evaluate the carrying value of our property and equipment, primarily our drilling rigs, when events or changes in circumstances indicate that the carrying value of such rigs may not be recoverable. Generally, extended periods of idle time and/or inability to contract rigs at economical rates are an indication that a rig may be impaired. However, the offshore drilling industry historically has been highly cyclical, and it is not unusual for rigs to be unutilized or underutilized for significant periods of time and subsequently resume full or near full utilization when business cycles change. Likewise, during periods of supply and demand imbalance, rigs frequently are contracted at or near cash break-even rates for extended periods of time until day rates increase when demand comes back into balance with supply. Impairment situations may arise with respect to specific individual rigs, groups of rigs, such as a specific type of drilling rig, or rigs in a certain geographic location. Our rigs are mobile and generally may be moved from markets with excess supply, if economically feasible. Our drilling rigs are suited for, and accessible to, markets throughout the world.

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. The determination of expected undiscounted cash flow amounts requires significant estimates, judgments and assumptions, including utilization, day rates, expense levels and capital requirements, as well as cash flows generated upon disposition, for each of our drilling rigs. Due to the inherent uncertainties associated with these estimates, we perform sensitivity analysis on key assumptions as part of our recoverability test.

If the global economy deteriorates and/or other events or changes in circumstances indicate that the carrying value of one or more drilling rigs may not be recoverable, we may conclude that a triggering event has occurred and perform a recoverability test. If, at the time of the recoverability test, management's judgments and assumptions regarding future industry conditions and operations have diminished, it is reasonably possible that we could conclude that one or more of our drilling rigs are impaired.

We test goodwill for impairment on an annual basis 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. Our two reportable segments represent our reporting units. If we determine it is more-likely-than-not that the fair value of a reporting unit exceeds its carrying value after qualitatively assessing all facts and circumstances, its goodwill is considered not impaired.

If the global economy deteriorates and/or our expectations relative to future offshore drilling industry conditions decline, we may conclude that the fair value of one or both of our reporting units has more-likely-than-not declined below its carrying amount and perform a quantitative assessment whereby we estimate the fair value of each reporting unit. In most instances, our calculation of the fair values of our reporting units is based on estimates of future discounted cash flows to be generated by our drilling rigs, which reflect management's judgments and assumptions regarding the appropriate risk-adjusted discount rate, as well as future industry conditions and operations, including expected utilization, day rates, expense levels, capital requirements and terminal values for each of our rigs. Due to the inherent uncertainties associated with these estimates, we perform sensitivity analysis on key assumptions as part of our goodwill impairment test.

If the aggregate fair value of our reporting units exceeds our market capitalization, we evaluate the reasonableness of the implied control premium which includes a comparison to implied control premiums from recent market transactions within our industry or other relevant benchmark data. To the extent that the implied control premium based on the aggregate fair value of our reporting units is not reasonable, we adjust the discount rate used in our discounted cash flow model and reduce the estimated fair values of our reporting units.

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If the estimated fair value of a reporting unit exceeds its carrying value, its goodwill is considered not impaired. If the estimated fair value of a reporting unit is less than its carrying value, we estimate the implied fair value of the reporting unit's goodwill. If the carrying amount of the reporting unit's goodwill exceeds the implied fair value of the goodwill, an impairment loss is recognized in an amount equal to such excess. In the event we dispose of drilling rig operations that constitute a business, goodwill would be allocated in the determination of gain or loss on disposal.

Based on our annual goodwill impairment test performed as of December 31, 2012, there was no impairment of goodwill, and neither of our reporting units were determined to be at risk of a goodwill impairment in the near-term.

If the global economy deteriorates and/or our expectations relative to future offshore drilling industry conditions decline, we may conclude that the fair value of one or both of our reporting units has more-likely-than-not declined below its carrying amount and perform an interim period goodwill impairment test. If, at the time of the goodwill impairment test, management's judgments and assumptions regarding future industry conditions and operations have diminished, or if the market value of our shares has declined, we could conclude that the goodwill of one or both of our reporting units has been impaired. It is reasonably possible that the judgments and assumptions inherent in our goodwill impairment test may change in response to future market conditions.

Asset impairment evaluations are highly subjective. In most instances, they involve expectations of future cash flows to be generated by our drilling rigs, which reflect management's judgments and assumptions regarding future industry conditions and operations, as well as management's estimates of expected utilization, day rates, expense levels and capital requirements. The estimates, judgments and assumptions used by management in the application of our asset impairment policies reflect both historical experience and an assessment of current operational, industry, market, economic and political environments. The use of different estimates, judgments, assumptions and expectations regarding future industry conditions and operations would likely result in materially different asset carrying values and operating results.

Income Taxes

We conduct operations and earn income in numerous countries and are subject to the laws of numerous tax jurisdictions. As of March 31, 2013, our condensed consolidated balance sheet included a $306.6 million net deferred income tax liability, an $81.3 million liability for income taxes currently payable and a $132.4 million liability for unrecognized tax benefits, inclusive of interest and penalties.

The carrying values of deferred income tax assets and liabilities reflect the application of our income tax accounting policies and are based on management's estimates, judgments and assumptions regarding future operating results and levels of taxable income. Carryforwards and tax credits are assessed for realization as a reduction of future taxable income by using a more-likely-than-not determination. We do not offset deferred tax assets and deferred tax liabilities attributable to different tax paying jurisdictions.

We do not provide deferred taxes on the undistributed earnings of certain subsidiaries because our policy and intention is to reinvest such earnings indefinitely. Should we make a distribution from these subsidiaries in the form of dividends or otherwise, we would be subject to additional income taxes.

The carrying values of liabilities for income taxes currently payable and unrecognized tax benefits are based on management's interpretation of applicable tax laws and incorporate management's estimates, judgments and assumptions regarding the use of tax planning strategies in various taxing jurisdictions. The use of different estimates, judgments and assumptions in connection with accounting for income taxes, especially those involving the deployment of tax planning strategies, may result in materially different carrying values of income tax assets and liabilities and operating results.

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We operate in many jurisdictions where tax laws relating to the offshore drilling industry are not well developed. In jurisdictions where available statutory law and regulations are incomplete or underdeveloped, we obtain professional guidance and consider existing industry practices before utilizing tax planning strategies and meeting our tax obligations.

Tax returns are routinely subject to audit in most jurisdictions and tax liabilities occasionally are finalized through a negotiation process. In some jurisdictions, income tax payments may be required before a final income tax obligation is determined in order to avoid significant penalties and/or interest. While we historically have not experienced significant adjustments to previously recognized tax assets and liabilities as a result of finalizing tax returns, there can be no assurance that significant adjustments will not arise in the future. In addition, there are several factors that could cause the future level of uncertainty relating to our tax liabilities to increase, including the following:

• The Internal Revenue Service and/or Her Majesty's Revenue and Customs may disagree with our interpretation of tax laws, treaties, or regulations with respect to our redomestication to the U.K. during 2009.

• During recent years, the number of tax jurisdictions in which we conduct operations has increased, and we currently anticipate that this trend will continue. 

• In order to utilize tax planning strategies and conduct operations efficiently, our subsidiaries frequently enter into transactions with affiliates that are generally subject to complex tax regulations and are frequently reviewed and challenged by tax authorities. 

• We may conduct future operations in certain tax jurisdictions where tax laws are not well developed, and it may be difficult to secure adequate professional guidance. 

• Tax laws, regulations, agreements, treaties and the administrative practices and precedents of tax authorities change frequently, requiring us to modify existing tax strategies to conform to such changes. 

Item 3.   Quantitative and Qualitative Disclosures About Market Risk

Information required under Item 3. has been incorporated into "Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations - Market Risk."

Item 4.   Controls and Procedures

Based on their evaluation as of the end of the period covered by this quarterly report on Form 10-Q, our Chief Executive Officer and Chief Financial Officer have concluded that our disclosure controls and procedures, as defined in Rule 13a-15 under the Securities and Exchange Act of 1934 (the "Exchange Act"), are effective.

During the three-month period ended March 31, 2013, there were no changes in our internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II - OTHER INFORMATION

Item 1.   Legal Proceedings

Pride FCPA Investigation

During 2010, Pride and its subsidiaries resolved their previously disclosed investigations into potential violations of the Foreign Corrupt Practices Act (the "FCPA") with the U.S. Department of Justice (the "DOJ") and the U.S. Securities and Exchange Commission (the "SEC"). The settlement with the DOJ included a deferred prosecution agreement (the "DPA") between Pride and the DOJ and a guilty plea by Pride Forasol, S.A.S., one of Pride’s subsidiaries, to FCPA-related charges. In November 2012, the DOJ moved (i) to dismiss the charges against Pride and end the DPA one year prior to its scheduled expiration; and (ii) to terminate the unsupervised probation of Pride Forasol, S.A.S. The Court granted the motions.

     Pride has received preliminary inquiries from governmental authorities of certain of the countries referenced in its settlements with the DOJ and the SEC. We could face additional fines, sanctions and other penalties from authorities in these and other relevant jurisdictions, including prohibition of our participating in or curtailment of business operations in those jurisdictions and the seizure of rigs or other assets. At this early stage of such inquiries, we are unable to determine what, if any, legal liability may result. Our customers in those jurisdictions could seek to impose penalties or take other actions adverse to our business. We could also face other third-party claims by directors, officers, employees, affiliates, advisors, attorneys, agents, stockholders, debt holders, or other interest holders or constituents of our Company. In addition, disclosure of the subject matter of the investigations and settlements could adversely affect our reputation and our ability to obtain new business or retain existing business from our current clients and potential clients, to attract and retain employees and to access the capital markets.

We cannot currently predict what, if any, actions may be taken by any other applicable government or other authorities or our customers or other third parties or the effect any such actions may have on our financial position, operating results or cash flows.

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.

We intend to vigorously defend against these 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 the 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.

45

Environmental Matters

We are currently subject to pending notices of assessment issued from 2008 to 2013 pursuant to which governmental authorities in Brazil are seeking fines in an aggregate amount of approximately $2.4 million for the release of drilling fluids, oil, brine, chemicals, grease or fuel from drilling rigs operating offshore Brazil. We have contested these notices and appealed certain adverse decisions and are awaiting decisions in these cases. Although we do not expect the outcome of these assessments to have a material adverse effect on our financial position, operating results or cash flows, there can be no assurance as to the ultimate outcome of these assessments. A $2.4 million liability related to these matters is included in accrued liabilities and other on our condensed consolidated balance sheet as of March 31, 2013.

We currently are subject to a pending administrative proceeding initiated during 2009 by a Spanish government authority seeking payment in an aggregate amount of approximately $4.0 million for an alleged environmental spill originating from ENSCO 5006 while it was operating offshore Spain. Our customer has posted guarantees with the Spanish government to cover potential penalties. Additionally, we expect to be indemnified for any payments resulting from this incident by our customer under the terms of the drilling contract. A criminal investigation of the incident was initiated during 2010 by a prosecutor in Tarragona, Spain, and the administrative proceedings have been suspended pending the outcome of this investigation.  We do not know at this time what, if any, involvement we may have in this investigation.

We intend to vigorously defend ourselves in the administrative proceeding and any criminal investigation. At this time, we are unable to predict the outcome of these matters or estimate the extent to which we may be exposed to any resulting liability. Although we do not expect the outcome of the proceedings to have a material adverse effect on our financial position, operating results or cash flows, there can be no assurance as to the ultimate outcome of the proceedings.

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.

Item 1A.   Risk Factors 

There are numerous factors that affect our business and results of operations, many of which are beyond our control. In addition to information set forth in this quarterly report, you should carefully read and consider "Item 1A. Risk Factors" in Part I and "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations" in Part II of our annual report on Form 10-K for the year ended December 31, 2012, which contains descriptions of significant risks that might cause our actual results of operations in future periods to differ materially from those currently anticipated or expected.

46

Item 2.   Unregistered Sales of Equity Securities and Use of Proceeds

The following table provides a summary of our repurchases of equity securities during the three-month period ended March 31, 2013:

Issuer Purchases of Equity Securities
Period	Total Number of Securities Purchased	Average Price Paid per Security		Total Number of Securities Purchased as Part of Publicly Announced Plans or Programs*	Approximate Dollar Value of Securities that May Yet Be Purchased Under Plans or Programs
January 1 - January 31	747	$	60.83	—	$	—
February 1 - February 28	51,060	$	60.71	—	$	—
March 1 - March 31	9,904	$	58.87	—	$	—
Total	61,711	$	60.41	—

* In connection with the termination of the ADS facility and the conversion to Class A ordinary shares during the second quarter of 2012, our previously executed share repurchase agreements with two investment banks became of no effect by their own terms. Accordingly, our share repurchase program, which provided for the repurchase from time to time of Ensco ADSs in an aggregate amount of up to $562.4 million, ended. The establishment of a new share repurchase program requires approval from our shareholders by special resolution. We are presenting our shareholders with a proposal to establish a new share repurchase program for up to a maximum of $2 billion in the aggregate at our May 2013 annual shareholder meeting. If approved, the share repurchase program will provide added flexibility to return capital to shareholders after consideration of other uses of cash flow, including investment in our fleet of drilling rigs and dividend increases.

During the three-month period ended March 31, 2013, repurchases of our equity securities primarily were made by an affiliated employee benefit trust from employees and non-employee directors in connection with the settlement of income tax withholding obligations arising from the vesting of share awards.  Such securities remain available for reissuance in connection with employee share awards.

47

Item 6.   Exhibits

Exhibit Number	Exhibit
*10.1	Fourth Amendment to the ENSCO International Incorporated 2005 Long-Term Incentive Plan (As Revised and Restated on December 22, 2009 and As Assumed by Ensco plc as of December 23, 2009), dated January 1, 2013.
*10.2	Second Amendment to the Ensco plc 2012 Long-Term Incentive Plan, effective January 1, 2012.
*15.1	Letter regarding unaudited interim financial information.
*31.1	Certification of the Chief Executive Officer of Registrant Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
*31.2	Certification of the Chief Financial Officer of Registrant Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
**32.1	Certification of the Chief Executive Officer of Registrant Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
**32.2	Certification of the Chief Financial Officer of Registrant Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
*101.INS	XBRL Instance Document
*101.SCH	XBRL Taxonomy Extension Schema
*101.CAL	XBRL Taxonomy Extension Calculation Linkbase
*101.DEF	XBRL Taxonomy Extension Definition Linkbase
*101.LAB	XBRL Taxonomy Extension Label Linkbase
*101.PRE	XBRL Taxonomy Extension Presentation Linkbase

*   Filed herewith.

** Furnished herewith.

48

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	Ensco plc
Date:   April 30, 2013	/s/ JAMES W. SWENT III
	James W. Swent III Executive Vice President and Chief Financial Officer (principal financial officer)
	/s/ DOUGLAS J. MANKO
	Douglas J. Manko Vice President - Finance (Corporate)
	/s/ ROBERT W. EDWARDS III
	Robert W. Edwards III Controller (principal accounting officer)

49

INDEX TO EXHIBITS

Exhibit Number	Exhibit
*10.1	Fourth Amendment to the ENSCO International Incorporated 2005 Long-Term Incentive Plan (As Revised and Restated on December 22, 2009 and As Assumed by Ensco plc as of December 23, 2009), dated January 1, 2013.
*10.2	Second Amendment to the Ensco plc 2012 Long-Term Incentive Plan, effective January 1, 2012.
*15.1	Letter regarding unaudited interim financial information.
*31.1	Certification of the Chief Executive Officer of Registrant Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
*31.2	Certification of the Chief Financial Officer of Registrant Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
**32.1	Certification of the Chief Executive Officer of Registrant Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
**32.2	Certification of the Chief Financial Officer of Registrant Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
*101.INS	XBRL Instance Document
*101.SCH	XBRL Taxonomy Extension Schema
*101.CAL	XBRL Taxonomy Extension Calculation Linkbase
*101.DEF	XBRL Taxonomy Extension Definition Linkbase
*101.LAB	XBRL Taxonomy Extension Label Linkbase
*101.PRE	XBRL Taxonomy Extension Presentation Linkbase

 *   Filed herewith.

** Furnished herewith.

50

EX-10.1

FOURTH AMENDMENT

TO THE

ENSCO INTERNATIONAL INCORPORATED

2005 LONG-TERM INCENTIVE PLAN

(As Revised and Restated on December 22, 2009 and

As Assumed by Ensco plc as of December 23, 2009)

THIS AMENDMENT is effective the first day of January 2013, by Ensco plc, having its principal office in London, England (hereinafter referred to as the “Company”).

WITNESSETH:

WHEREAS, ENSCO International Incorporated adopted the Ensco International Incorporated 2005 Long-Term Incentive Plan (the “Plan”) effective January 1, 2005;

WHEREAS, the Plan was revised and restated on December 22, 2009, and was subsequently assumed by the Company effective as of December 23, 2009;

WHEREAS, the Board of Directors of the Company, upon recommendation of the Executive Compensation Subcommittee of its Compensation Committee during its regular meeting held on 25 February 2013, has authorized and approved this Fourth Amendment to the Plan during a regular meeting held on 26 February 2013; and

WHEREAS, the Company now desires to adopt this Fourth Amendment to the revised and restated Plan for the purpose of amending Sections 3(b)(xvi) and 6(h) of the Plan to prohibit cash buyouts of underwater options;

NOW, THEREFORE, in consideration of the premises and covenants herein contained, the Company hereby adopts the following Fourth Amendment to the Plan:

1. Section 3(b)(xvi) of the Plan is hereby amended in its entirety to read as follows:

(xvi) Waive or amend any terms, conditions, restriction or limitation on an Award, except that the prohibitions on the repricing of Options and the cash buyout of underwater Options, as described in Section 6(h), may not be waived;

2. Section 6(h) of the Plan is hereby amended in its entirety to read as follows:

(h)Restrictions on Repricing and Cash Buyouts. Except with respect to adjustments for changes in capitalization as provided in Section 10(a), no outstanding Option may be:

(i)amended to decrease the Exercise Price,

(ii)canceled in exchange for the grant of any Option with a lower Exercise Price or any new Award, or

(iii)otherwise be subject to any action that would be treated under accounting rules or otherwise as a “repricing” of such Option (including a cash buyout or voluntary surrender/subsequent regrant of an underwater Option), unless such action is first approved by the Company's shareholders.

Within the limitations of this Plan, the Committee may otherwise modify outstanding Options; provided that no modification of an Option shall, without the consent of the Optionee, alter or impair the Optionee's rights or obligations under such Option.

IN WITNESS WHEREOF, the Company, acting by and through its duly authorized officers, has caused this Fourth Amendment to be executed effective as first above written.

ENSCO PLC
	/s/ Brady K. Long
By:	Brady K. Long
Its:	Vice President, General Counsel and Secretary

EX-10.2

SECOND AMENDMENT

TO THE

ENSCO plc

2012 LONG-TERM INCENTIVE PLAN

THIS AMENDMENT is effective the 1st day of January 2013, by Ensco plc, having its principal office in London, England (hereinafter referred to as the “Company”).

WITNESSETH:

WHEREAS, the Company adopted the Ensco plc 2012 Long-Term Incentive Plan (the “Plan”) and Annex 2 to the Plan (“Annex 2), effective 1 January 2012;

WHEREAS, the Board of Directors of the Company, upon recommendation of the Executive Compensation Subcommittee of its Compensation Committee during its regular meeting held on 25 February 2013, has authorized and approved this Second Amendment to the Plan during a regular meeting held on 26 February 2013; and

WHEREAS, the Company now desires to adopt this Second Amendment to the Plan for the purpose of (i) amending Sections 3(b)(xvi) and 6(h) of the Plan to prohibit cash buyouts of underwater options, and (ii) amending Section 9(a) of the Plan and Section 9 of Annex 2 to provide that dividend equivalents may accrue under a Performance Unit Award and be payable on the same date as the settlement of the Performance Unit Award, and that the dividend equivalents may be payable in cash or Shares;

NOW, THEREFORE, in consideration of the premises and covenants herein contained, the Company hereby adopts the following Second Amendment to the Plan:

1.Section 3(b)(xvi) of the Plan is hereby amended in its entirety to read as follows:

(xvi) Waive or amend any terms, conditions, restriction or limitation on an Award, except that the prohibitions on the repricing of Options and the cash buyout of underwater Options, as described in Section 6(h), may not be waived;

2.Section 6(h) of the Plan is hereby amended in its entirety to read as follows:

(h)Restrictions on Repricing and Cash Buyouts. Except with respect to adjustments for changes in capitalization as provided in Section 11(a), no outstanding Option may be:

(i)amended to decrease the Exercise Price,

(ii)canceled in exchange for the grant of any Option with a lower Exercise Price or any new Award, or

(iii)otherwise be subject to any action that would be treated under accounting rules or otherwise as a “repricing” of such Option (including a cash buyout or voluntary surrender/subsequent regrant of an underwater Option), unless such action is first approved by the Company's shareholders.

Within the limitations of this Plan, the Committee may otherwise modify outstanding Options; provided that no modification of an Option shall, without the consent of the Optionee, alter or impair the Optionee's rights or obligations under such Option.

3.Section 9(a) of the Plan is hereby amended to add the following sentence to the end thereof to read as follows:

The terms of a Performance Unit Award may provide for an accrual during the Performance Period of a dividend equivalent with respect to the number of Shares, if any, that become payable under the Performance Unit Award under Section 10(b) in the case of a dividend or other distribution on the Shares during the Performance Period, which aggregate dividend equivalents shall be payable to the Participant on the same date as any such Shares are issued to the Participant under Section 10(b).

4.Section 9 of Annex 2 is hereby amended in its entirety to read as follows:

The following provision shall supplement Section 9(a) of the Plan:

(a)Grant of Performance Unit Awards. The Committee may grant Performance Unit Awards under this Annex 2 payable in the form of (i) cash, (ii) either cash or Shares, or (iii) a combination of Shares and cash to the eligible Employees determined under Section 4(a). The terms of a Performance Unit Award under this Annex 2 may provide for an accrual during the Performance Period of a dividend equivalent with respect to the number of Shares, if any, that become payable under the Performance Unit Award under Section 10(b) in the case of a dividend or other distribution on the Shares during the Performance Period, which aggregate dividend equivalents may be payable in the form of cash or Shares or a combination of Shares and cash and shall be payable to the Participant on the same date as any such Shares are issued to the Participant under Section 10(b) or whole or partial cash settlement is made under this Annex 2.

IN WITNESS WHEREOF, the Company, acting by and through its duly authorized officers, has caused this Second Amendment to be executed effective as first above written.

ENSCO plc
	/s/ Brady K. Long
By:	Brady K. Long
Its:	Vice President, General Counsel and Secretary

ENSCO plc

______________________________

By:Brady K. Long

Its:Vice President, General Counsel and Secretary

EX-15.1

April 30, 2013

Ensco plc

London, England

Re: Registration Statements on Form S-8 (Nos. 333-174611, 333-58625, 33-40282, 333-97757, 333-125048, 333-156530, and 333-181593) and on Form S-3 (No. 333-179021)

With respect to the subject registration statements, we acknowledge our awareness of the use therein of our report dated April 30, 2013 related to our review of interim financial statements.

Pursuant to Rule 436 under the Securities Act of 1933 (the Act), such report is not considered part of a registration statement prepared or certified by an independent registered public accounting firm, or a report prepared or certified by an independent registered public accounting firm within the meaning of Sections 7 and 11 of the Act.

/s/ KPMG LLP

Houston, Texas

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Daniel W. Rabun, certify that:

1. I have reviewed this report on Form 10-Q for the fiscal quarter ending March 31, 2013 of Ensco plc;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Dated:  April 30, 2013

/s/ Daniel W. Rabun     

Daniel W. Rabun

Chairman, President and

Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, James W. Swent III, certify that:

1. I have reviewed this report on Form 10-Q for the fiscal quarter ending March 31, 2013 of Ensco plc;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Dated:  April 30, 2013

/s/ James W. Swent III

James W. Swent III

Executive Vice President and

Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Ensco plc (the "Company") on Form 10-Q for the period ending March 31, 2013 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Daniel W. Rabun, Chairman, President and Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002 (the "Act"), that: 

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 (the "Exchange Act"); and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Daniel W. Rabun     

Daniel W. Rabun

Chairman, President and

Chief Executive Officer

Dated:  April 30, 2013

The foregoing certification is being furnished solely pursuant to § 906 of the Act and Rule 13a-14(b) promulgated under the Exchange Act and is not being filed as part of the Report or as a separate disclosure document.

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Ensco plc (the "Company") on Form 10-Q for the period ending March 31, 2013 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, James W. Swent III, Executive Vice President and Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002 (the "Act"), that: 

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 (the "Exchange Act"); and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ James W. Swent III

James W. Swent III

Executive Vice President and

Chief Financial Officer

Dated:  April 30, 2013

The foregoing certification is being furnished solely pursuant to § 906 of the Act and Rule 13a-14(b) promulgated under the Exchange Act and is not being filed as part of the Report or as a separate disclosure document.

XML

Segment Information (Schedule Of Segment Reporting Information) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenues	$ 1,149.9	$ 1,020.6
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	560.8	502.2
Depreciation	149.0	136.0
General and administrative	37.8	38.2
OPERATING INCOME	402.3	344.2
Property and equipment, net	13,155.2	12,889.9	13,145.6
Floaters [Member]
Segment Reporting Information [Line Items]
Revenues	719.2	639.3
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	344.9	312.9
Depreciation	107.1	91.0
General and administrative	0	0
OPERATING INCOME	267.2	235.4
Property and equipment, net	10,710.0	10,390.4
Jackups [Member]
Segment Reporting Information [Line Items]
Revenues	410.5	359.8
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	200.2	173.6
Depreciation	40.3	41.4
General and administrative	0	0
OPERATING INCOME	170.0	144.8
Property and equipment, net	2,413.3	2,457.7
Other [Member]
Segment Reporting Information [Line Items]
Revenues	20.2	21.5
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	15.7	15.7
Depreciation	0	0
General and administrative	0	0
OPERATING INCOME	4.5	5.8
Property and equipment, net	0	12.4
Operating Segments Total [Member]
Segment Reporting Information [Line Items]
Revenues	1,149.9	1,020.6
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	560.8	502.2
Depreciation	147.4	132.4
General and administrative	0	0
OPERATING INCOME	441.7	386.0
Property and equipment, net	13,123.3	12,860.5
Reconciling Items [Member]
Segment Reporting Information [Line Items]
Revenues	0	0
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	0	0
Depreciation	1.6	3.6
General and administrative	37.8	38.2
OPERATING INCOME	(39.4)	(41.8)
Property and equipment, net	$ 31.9	$ 29.4

XML

Guarantee Of Registered Securities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Guarantor Obligations [Line Items]
Senior notes aggregate outstanding principal balance	1,700.0
8.50% Senior notes due 2019 [Member]
Guarantor Obligations [Line Items]
Debt instrument interest rate stated percentage	8.50%
Senior note, maturity year	2019
6.875% Senior notes due 2020 [Member]
Guarantor Obligations [Line Items]
Debt instrument interest rate stated percentage	6.875%
Senior note, maturity year	2020
7.875% Senior notes due 2040 [Member]
Guarantor Obligations [Line Items]
Debt instrument interest rate stated percentage	7.875%
Senior note, maturity year	2040
7.20% Debentures Due 2027 [Member]
Guarantor Obligations [Line Items]
Debt instrument interest rate stated percentage	7.20%
Senior note, maturity year	2027
Senior notes aggregate outstanding principal balance	150.0

XML

Supplemental Financial Information (Other Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Supplemental Financial Information [Abstract]
Deferred revenue	$ 215.7	$ 224.5
Unrecognized tax benefits (inclusive of interest and penalties)	132.4	129.6
Intangible liabilities	101.9	118.0
Supplemental executive retirement plan liabilities	38.4	33.3
Personnel costs	28.4	31.6
Other	31.6	36.4
Other liabilities	$ 548.4	$ 573.4

XML

Earnings Per Share (Reconciliation Of Weighted-Average Shares Used In Earnings Per Share Computations) (Details)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share [Abstract]
Weighted-average shares - basic (in shares)	230,300,000	228,800,000
Potentially dilutive share options (in shares)	300,000	400,000
Weighted-average shares - diluted (in shares)	230,600,000	229,200,000
Antidilutive share options excluded from computation of diluted earnings per share (in shares)	100,000	400,000

XML

Guarantee Of Registered Securities (Tables)

3 Months Ended

Mar. 31, 2013

Guarantees [Abstract]

Condensed Consolidating Statements Of Income

ENSCO PLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF INCOME Three Months Ended March 31, 2013 (in millions) (Unaudited)
	Ensco plc			ENSCO International Incorporated			Pride International, Inc.			Other Non-Guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
OPERATING REVENUES	$	5.5		$	38.1		$	—		$	1,183.7		$	(77.4	)	$	1,149.9
OPERATING EXPENSES
Contract drilling (exclusive of depreciation)	12.4			38.1			—			587.7			(77.4		)	560.8
Depreciation	.1			.8			—			148.1			—			149.0
General and administrative	16.9			.2			—			20.7			—			37.8
OPERATING (LOSS) INCOME	(23.9		)	(1.0		)	—			427.2			—			402.3
OTHER (EXPENSE) INCOME, NET	(14.6		)	(7.4		)	(14.6		)	6.8			—			(29.8		)
(LOSS) INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(38.5		)	(8.4		)	(14.6		)	434.0			—			372.5
INCOME TAX PROVISION	—			29.5			—			22.2			—			51.7
DISCONTINUED OPERATIONS, NET	—			—			—			(.9		)	—			(.9		)
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	355.6			111.7			52.4			—			(519.7		)	—
NET INCOME	317.1			73.8			37.8			410.9			(519.7		)	319.9
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—			—			—			(2.8		)	—			(2.8		)
NET INCOME ATTRIBUTABLE TO ENSCO	$	317.1		$	73.8		$	37.8		$	408.1		$	(519.7	)	$	317.1

ENSCO PLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF INCOME Three Months Ended March 31, 2012 (in millions) (Unaudited)
	Ensco plc			ENSCO International Incorporated			Pride International, Inc.			Other Non-Guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
OPERATING REVENUES	$	21.9		$	10.6		$	—		$	1,037.0		$	(48.9	)	$	1,020.6
OPERATING EXPENSES
Contract drilling (exclusive of depreciation)	6.9			10.6			—			533.6			(48.9		)	502.2
Depreciation	.1			.8			—			135.1			—			136.0
General and administrative	14.6			—			—			23.6			—			38.2
OPERATING INCOME (LOSS)	.3			(.8		)	—			344.7			—			344.2
OTHER EXPENSE, NET	(11.2		)	(.3		)	(11.7		)	(3.5		)	—			(26.7		)
(LOSS) INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(10.9		)	(1.1		)	(11.7		)	341.2			—			317.5
INCOME TAX PROVISION	—			11.2			—			25.8			—			37.0
DISCONTINUED OPERATIONS, NET	—			—			—			(13.1		)	—			(13.1		)
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	276.3			44.2			79.7			—			(400.2		)	—
NET INCOME	265.4			31.9			68.0			302.3			(400.2		)	267.4
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—			—			—			(2.0		)	—			(2.0		)
NET INCOME ATTRIBUTABLE TO ENSCO	$	265.4		$	31.9		$	68.0		$	300.3		$	(400.2	)	$	265.4

Condensed Consolidating Statements Of Comprehensive Income [Table Text Block]

ENSCO PLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

Three Months Ended March 31, 2013

(in millions)

(Unaudited)

	Ensco plc		ENSCO International Incorporated			Pride International, Inc.		Other Non-Guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
NET INCOME	$	317.1	$	73.8		$	37.8	$	410.9		$	(519.7	)	$	319.9
OTHER COMPREHENSIVE (LOSS) INCOME, NET
Net change in fair value of derivatives	—		(4.0		)	—		—			—			(4.0		)
Reclassification of net gains and losses on derivative instruments from other comprehensive loss (income) into net income	—		.1			—		(1.1		)	—			(1.0		)
Other	—		—			—		(.1		)	—			(.1		)
NET OTHER COMPREHENSIVE LOSS	—		(3.9		)	—		(1.2		)	—			(5.1		)
COMPREHENSIVE INCOME	317.1		69.9			37.8		409.7			(519.7		)	314.8
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—		—			—		(2.8		)	—			(2.8		)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	$	317.1	$	69.9		$	37.8	$	406.9		$	(519.7	)	$	312.0

ENSCO PLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

Three Months Ended March 31, 2012

(in millions)

(Unaudited)

	Ensco plc		ENSCO International Incorporated		Pride International, Inc.		Other Non-Guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
NET INCOME	$	265.4	$	31.9	$	68.0	$	302.3		$	(400.2	)	$	267.4
OTHER COMPREHENSIVE (LOSS) INCOME, NET
Net change in fair value of derivatives	—		1.9		—		4.4			—			6.3
Reclassification of net gains and losses on derivative instruments from other comprehensive loss (income) into net income	—		.1		—		(.2		)	—			(.1		)
Other	—		—		—		(1.9		)	—			(1.9		)
NET OTHER COMPREHENSIVE (LOSS) INCOME	—		2.0		—		2.3			—			4.3
COMPREHENSIVE INCOME	265.4		33.9		68.0		304.6			(400.2		)	271.7
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—		—		—		(2.0		)	—			(2.0		)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	$	265.4	$	33.9	$	68.0	$	302.6		$	(400.2	)	$	269.7

Condensed Consolidating Balance Sheets

ENSCO PLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS March 31, 2013 (in millions) (Unaudited)
	Ensco plc		ENSCO International Incorporated		Pride International, Inc.		Other Non-Guarantor Subsidiaries of Ensco		Consolidating Adjustments			Total
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	289.1	$	—	$	115.0	$	157.7	$	—		$	561.8
Accounts receivable, net	—		.3		—		808.8		—			809.1
Accounts receivable from affiliates	1,296.2		166.4		1.4		1,577.1		(3,041.1		)	—
Other	2.9		24.8		—		386.3		—			414.0
Total current assets	1,588.2		191.5		116.4		2,929.9		(3,041.1		)	1,784.9
PROPERTY AND EQUIPMENT, AT COST	2.1		30.1		—		15,861.4		—			15,893.6
Less accumulated depreciation	1.2		23.6		—		2,713.6		—			2,738.4
Property and equipment, net	.9		6.5		—		13,147.8		—			13,155.2
GOODWILL	—		—		—		3,274.0		—			3,274.0
DUE FROM AFFILIATES	2,677.0		3,758.5		1,640.4		5,125.2		(13,201.1		)	—
INVESTMENTS IN AFFILIATES	13,831.0		2,799.8		3,836.2		—		(20,467.0		)	—
OTHER ASSETS, NET	10.7		64.8		—		302.9		—			378.4
	$	18,107.8	$	6,821.1	$	5,593.0	$	24,779.8	$	(36,709.2	)	$	18,592.5
LIABILITIES AND SHAREHOLDERS' EQUITY
CURRENT LIABILITIES
Accounts payable and accrued liabilities	$	4.9	$	47.5	$	23.4	$	722.1	$	—		$	797.9
Accounts payable to affiliates	1,653.7		56.5		—		1,330.9		(3,041.1		)	—
Current maturities of long-term debt	—		—		—		47.5		—			47.5
Total current liabilities	1,658.6		104.0		23.4		2,100.5		(3,041.1		)	845.4
DUE TO AFFILIATES	1,910.0		2,260.6		954.6		8,075.9		(13,201.1		)	—
LONG-TERM DEBT	2,470.6		149.1		2,032.7		130.9		—			4,783.3
DEFERRED INCOME TAXES	—		325.2		—		21.6		—			346.8
OTHER LIABILITIES	—		1.0		10.5		536.9		—			548.4
ENSCO SHAREHOLDERS' EQUITY	12,068.6		3,981.2		2,571.8		13,907.5		(20,467.0		)	12,062.1
NONCONTROLLING INTERESTS	—		—		—		6.5		—			6.5
Total equity	12,068.6		3,981.2		2,571.8		13,914.0		(20,467.0		)	12,068.6
	$	18,107.8	$	6,821.1	$	5,593.0	$	24,779.8	$	(36,709.2	)	$	18,592.5

ENSCO PLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS December 31, 2012 (in millions)
	Ensco plc		ENSCO International Incorporated		Pride International, Inc.		Other Non-Guarantor Subsidiaries of Ensco		Consolidating Adjustments			Total
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	271.8	$	1.7	$	85.0	$	128.6	$	—		$	487.1
Accounts receivable, net	—		.2		—		811.2		—			811.4
Accounts receivable from affiliates	1,294.5		226.5		—		2,375.1		(3,896.1		)	—
Other	2.8		24.9		—		397.7		—			425.4
Total current assets	1,569.1		253.3		85.0		3,712.6		(3,896.1		)	1,723.9
PROPERTY AND EQUIPMENT, AT COST	2.1		30.2		—		15,704.8		—			15,737.1
Less accumulated depreciation	1.1		23.5		—		2,566.9		—			2,591.5
Property and equipment, net	1.0		6.7		—		13,137.9		—			13,145.6
GOODWILL	—		—		—		3,274.0		—			3,274.0
DUE FROM AFFILIATES	3,483.5		3,594.7		1,628.4		4,748.9		(13,455.5		)	—
INVESTMENTS IN AFFILIATES	13,469.3		2,693.8		3,824.8		—		(19,987.9		)	—
OTHER ASSETS, NET	11.3		67.4		—		343.1		—			421.8
	$	18,534.2	$	6,615.9	$	5,538.2	$	25,216.5	$	(37,339.5	)	$	18,565.3
LIABILITIES AND SHAREHOLDERS' EQUITY
CURRENT LIABILITIES
Accounts payable and accrued liabilities	$	31.0	$	28.1	$	34.1	$	849.0	$	—		$	942.2
Accounts payable to affiliates	2,364.8		136.9		—		1,394.4		(3,896.1		)	—
Current maturities of long-term debt	—		—		—		47.5		—			47.5
Total current liabilities	2,395.8		165.0		34.1		2,290.9		(3,896.1		)	989.7
DUE TO AFFILIATES	1,816.7		2,054.7		877.5		8,706.6		(13,455.5		)	—
LONG-TERM DEBT	2,469.6		149.0		2,040.8		139.0		—			4,798.4
DEFERRED INCOME TAXES	—		335.1		—		16.6		—			351.7
OTHER LIABILITIES	—		—		10.8		562.6		—			573.4
ENSCO SHAREHOLDERS' EQUITY	11,852.1		3,912.1		2,575.0		13,495.1		(19,987.9		)	11,846.4
NONCONTROLLING INTERESTS	—		—		—		5.7		—			5.7
Total equity	11,852.1		3,912.1		2,575.0		13,500.8		(19,987.9		)	11,852.1
	$	18,534.2	$	6,615.9	$	5,538.2	$	25,216.5	$	(37,339.5	)	$	18,565.3

Condensed Consolidating Statements Of Cash Flows

ENSCO PLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS Three Months Ended March 31, 2013 (in millions) (Unaudited)
	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      operatingactivities of continuing operations	$	(55.3	)	$	(34.0	)	$	11.3	$	420.1		$	—	$	342.1
INVESTING ACTIVITIES
Additions to property and equipment	—			—			—		(168.3		)	—		(168.3		)
Other	—			.1			—		.8			—		.9
Net cash provided by (used in) investing activities of continuing operations	—			.1			—		(167.5		)	—		(167.4		)
FINANCING ACTIVITIES
Cash dividends paid	(116.5		)	—			—		—			—		(116.5		)
Proceeds from exercise of share   options	13.4			—			—		—			—		13.4
Reduction of long-term borrowings	—			—			—		(7.1		)	—		(7.1		)
Advances from (to) affiliates	179.4			32.2			18.7		(230.3		)	—		—
Other	(3.7		)	—			—		(1.8		)	—		(5.5		)
Net cash provided by (used in)          financing activities of     continuing operations	72.6			32.2			18.7		(239.2		)	—		(115.7		)
DISCONTINUED OPERATIONS
Operating activities	—			—			—		.2			—		.2
Investing activities	—			—			—		15.5			—		15.5
Net cash provided by discontinued operations	—			—			—		15.7			—		15.7
Effect of exchange rate changes on cash and cash equivalents	—			—			—		—			—		—
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	17.3			(1.7		)	30.0		29.1			—		74.7
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	271.8			1.7			85.0		128.6			—		487.1
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	289.1		$	—		$	115.0	$	157.7		$	—	$	561.8

ENSCO PLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS Three Months Ended March 31, 2012 (in millions) (Unaudited)
	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      operatingactivities of continuing operations	$	(20.3	)	$	(21.8	)	$	(67.4	)	$	665.1		$	—	$	555.6
INVESTING ACTIVITIES
Additions to property and   equipment	—			—			—			(764.1		)	—		(764.1		)
Other	—			.7			—			4.4			—		5.1
Net cash provided by   (used in) investing activities of     continuing operations	—			.7			—			(759.7		)	—		(759.0		)
FINANCING ACTIVITIES
Cash dividends paid	(86.8		)	—			—			—			—		(86.8		)
Commercial paper borrowings,   net	75.0			—			—			—			—		75.0
Proceeds from exercise of share   options				11.9			—			—			—		11.9
Reduction of long-term borrowings	—			—			—			(7.1		)	—		(7.1		)
Advances (to) from affiliates	(192.3		)	22.8			74.1			95.4			—		—
Other	—			(.1		)	—			(3.5		)	—		(3.6		)
Net cash (used in) provided by          financing activities of   continuing operations	(204.1		)	34.6			74.1			84.8			—		(10.6		)
DISCONTINUED OPERATIONS
Operating activities	—			—			—			(8.3		)	—		(8.3		)
Net cash used in discontinued operations	—			—			—			(8.3		)	—		(8.3		)
Effect of exchange rate changes   on cash and cash equivalents	—			—			—			.5			—		.5
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(224.4		)	13.5			6.7			(17.6		)	—		(221.8		)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	236.6			—			22.6			171.5			—		430.7
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	12.2		$	13.5		$	29.3		$	153.9		$	—	$	208.9

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Guarantee Of Registered Securities (Condensed Consolidating Statements of Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
NET INCOME	$ 319.9	$ 267.4
OTHER COMPREHENSIVE (LOSS) INCOME, NET
Net change in fair value of derivatives	(4.0)	6.3
Reclassification of gains and losses on derivative instruments from other comprehensive (income) into net income	(1.0)	(0.1)
Other	(0.1)	(1.9)
NET OTHER COMPREHENSIVE (LOSS) INCOME	(5.1)	4.3
COMPREHENSIVE INCOME	314.8	271.7
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(2.8)	(2.0)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	312.0	269.7
Ensco Plc [Member]
NET INCOME	317.1	265.4
OTHER COMPREHENSIVE (LOSS) INCOME, NET
Net change in fair value of derivatives	0	0
Reclassification of gains and losses on derivative instruments from other comprehensive (income) into net income	0	0
Other	0	0
NET OTHER COMPREHENSIVE (LOSS) INCOME	0	0
COMPREHENSIVE INCOME	317.1	265.4
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0	0
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	317.1	265.4
ENSCO International Inc. [Member]
NET INCOME	73.8	31.9
OTHER COMPREHENSIVE (LOSS) INCOME, NET
Net change in fair value of derivatives	(4.0)	1.9
Reclassification of gains and losses on derivative instruments from other comprehensive (income) into net income	0.1	0.1
Other	0	0
NET OTHER COMPREHENSIVE (LOSS) INCOME	(3.9)	2.0
COMPREHENSIVE INCOME	69.9	33.9
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0	0
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	69.9	33.9
Pride International, Inc. [Member]
NET INCOME	37.8	68.0
OTHER COMPREHENSIVE (LOSS) INCOME, NET
Net change in fair value of derivatives	0	0
Reclassification of gains and losses on derivative instruments from other comprehensive (income) into net income	0	0
Other	0	0
NET OTHER COMPREHENSIVE (LOSS) INCOME	0	0
COMPREHENSIVE INCOME	37.8	68.0
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0	0
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	37.8	68.0
Other Non-Guarantor Subsidiaries Of Ensco [Member]
NET INCOME	410.9	302.3
OTHER COMPREHENSIVE (LOSS) INCOME, NET
Net change in fair value of derivatives	0	4.4
Reclassification of gains and losses on derivative instruments from other comprehensive (income) into net income	(1.1)	(0.2)
Other	(0.1)	(1.9)
NET OTHER COMPREHENSIVE (LOSS) INCOME	(1.2)	2.3
COMPREHENSIVE INCOME	409.7	304.6
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(2.8)	(2.0)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	406.9	302.6
Consolidating Adjustments [Member]
NET INCOME	(519.7)	(400.2)
OTHER COMPREHENSIVE (LOSS) INCOME, NET
Net change in fair value of derivatives	0	0
Reclassification of gains and losses on derivative instruments from other comprehensive (income) into net income	0	0
Other	0	0
NET OTHER COMPREHENSIVE (LOSS) INCOME	0	0
COMPREHENSIVE INCOME	(519.7)	(400.2)
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0	0
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	$ (519.7)	$ (400.2)

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Supplemental Financial Information (Accounts Receivable, Net) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]
Accounts receivable	$ 827.0	$ 830.6
Allowance for doubtful accounts	(17.9)	(19.2)
Accounts receivable, net	809.1	811.4
Trade [Member]
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]
Accounts receivable	814.8	812.4
Other [Member]
Supplemental Information For Property, Casualty Insurance Underwriters [Line Items]
Accounts receivable	$ 12.2	$ 18.2

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Contingencies (Narrative) (Details) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended
	Apr. 30, 2012	Mar. 31, 2013 occurrence plaintiffs claim	Mar. 31, 2013 plaintiffs claim	Dec. 31, 2012	Dec. 31, 2009	Mar. 31, 2009
Oil and Gas Delivery Commitments and Contracts [Line Items]
Distance from original drilling location in miles						95
Leg and debris removal costs	$ 19,000,000
Number of payments related to leg and debris removal costs	9
Payments for Leg and Debris Removal			14,000,000
Proceeds from Insurance Settlement, Investing Activities		13,100,000
Wreckage And Debris Removal		5,000,000	5,000,000	9,000,000
Wreckage And Debris Removal Receivables		5,900,000	5,900,000	13,200,000
Loss Contingency, Pending Claims, Number		3	3
Civil litigation claim damages for cost of repair and business interruption due to pipeline rupture					26,000,000
Liability insurance self-insured retention per occurrence		10,000,000	10,000,000
Annual liability coverage limit for wreckage and debris removal costs		500,000,000
Liability insurance self-insured retention		15,000,000	15,000,000
Number of Occurrences		2
Liability insurance self insured retention for each occurrence thereafter		1,000,000
Number of plaintiffs		100	100
Environmental liabilities		2,400,000
Spain [Member]
Oil and Gas Delivery Commitments and Contracts [Line Items]
Aggregate amount of pending administrative proceeding raised by governmental authority		4,000,000
Minimum [Member]
Oil and Gas Delivery Commitments and Contracts [Line Items]
Loss Contingency, Damages Sought, Value		$ 5,000,000

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Guarantee Of Registered Securities (Condensed Consolidating Statements Of Cash Flows) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
OPERATING ACTIVITIES
Net cash (used in) provided by operating activities of continuing operations	$ 342.1	$ 555.6
INVESTING ACTIVITIES
Additions to property and equipment	(168.3)	(764.1)
Other	0.9	5.1
Net cash used in investing activities of continuing operations	(167.4)	(759.0)
FINANCING ACTIVITIES
Cash dividends paid	(116.5)	(86.8)
Commercial paper borrowings, net	0	75.0
Proceeds from exercise of share options	13.4	11.9
Reduction of long-term borrowings	(7.1)	(7.1)
Advances (to) from affiliates	0	0
Other	(5.5)	(3.6)
Net cash used in financing activities of continuing operations	(115.7)	(10.6)
DISCONTINUED OPERATIONS
Operating activities	0.2	(8.3)
Investing activities	15.5	0
Net cash provided by (used in) discontinued operations	15.7	(8.3)
Effect of exchange rate changes on cash and cash equivalents	0	0.5
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	74.7	(221.8)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	487.1	430.7
CASH AND CASH EQUIVALENTS, END OF PERIOD	561.8	208.9
Ensco Plc [Member]
OPERATING ACTIVITIES
Net cash (used in) provided by operating activities of continuing operations	(55.3)	(20.3)
INVESTING ACTIVITIES
Additions to property and equipment	0	0
Other	0	0
Net cash used in investing activities of continuing operations	0	0
FINANCING ACTIVITIES
Cash dividends paid	(116.5)	(86.8)
Commercial paper borrowings, net		75.0
Proceeds from exercise of share options	13.4
Reduction of long-term borrowings	0	0
Advances (to) from affiliates	179.4	(192.3)
Other	(3.7)	0
Net cash used in financing activities of continuing operations	72.6	(204.1)
DISCONTINUED OPERATIONS
Operating activities	0	0
Investing activities	0
Net cash provided by (used in) discontinued operations	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	17.3	(224.4)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	271.8	236.6
CASH AND CASH EQUIVALENTS, END OF PERIOD	289.1	12.2
ENSCO International Inc. [Member]
OPERATING ACTIVITIES
Net cash (used in) provided by operating activities of continuing operations	(34.0)	(21.8)
INVESTING ACTIVITIES
Additions to property and equipment	0	0
Other	0.1	0.7
Net cash used in investing activities of continuing operations	0.1	0.7
FINANCING ACTIVITIES
Cash dividends paid	0	0
Commercial paper borrowings, net		0
Proceeds from exercise of share options	0	11.9
Reduction of long-term borrowings	0	0
Advances (to) from affiliates	32.2	22.8
Other	0	(0.1)
Net cash used in financing activities of continuing operations	32.2	34.6
DISCONTINUED OPERATIONS
Operating activities	0	0
Investing activities	0
Net cash provided by (used in) discontinued operations	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(1.7)	13.5
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	1.7	0
CASH AND CASH EQUIVALENTS, END OF PERIOD	0	13.5
Pride International, Inc. [Member]
OPERATING ACTIVITIES
Net cash (used in) provided by operating activities of continuing operations	11.3	(67.4)
INVESTING ACTIVITIES
Additions to property and equipment	0	0
Other	0	0
Net cash used in investing activities of continuing operations	0	0
FINANCING ACTIVITIES
Cash dividends paid	0	0
Commercial paper borrowings, net		0
Proceeds from exercise of share options	0	0
Reduction of long-term borrowings	0	0
Advances (to) from affiliates	18.7	74.1
Other	0	0
Net cash used in financing activities of continuing operations	18.7	74.1
DISCONTINUED OPERATIONS
Operating activities	0	0
Investing activities	0
Net cash provided by (used in) discontinued operations	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	30.0	6.7
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	85.0	22.6
CASH AND CASH EQUIVALENTS, END OF PERIOD	115.0	29.3
Other Non-Guarantor Subsidiaries Of Ensco [Member]
OPERATING ACTIVITIES
Net cash (used in) provided by operating activities of continuing operations	420.1	665.1
INVESTING ACTIVITIES
Additions to property and equipment	(168.3)	(764.1)
Other	0.8	4.4
Net cash used in investing activities of continuing operations	(167.5)	(759.7)
FINANCING ACTIVITIES
Cash dividends paid	0	0
Commercial paper borrowings, net		0
Proceeds from exercise of share options	0	0
Reduction of long-term borrowings	(7.1)	(7.1)
Advances (to) from affiliates	(230.3)	95.4
Other	(1.8)	(3.5)
Net cash used in financing activities of continuing operations	(239.2)	84.8
DISCONTINUED OPERATIONS
Operating activities	0.2	(8.3)
Investing activities	15.5
Net cash provided by (used in) discontinued operations	15.7	(8.3)
Effect of exchange rate changes on cash and cash equivalents	0	0.5
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	29.1	(17.6)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	128.6	171.5
CASH AND CASH EQUIVALENTS, END OF PERIOD	157.7	153.9
Consolidating Adjustments [Member]
OPERATING ACTIVITIES
Net cash (used in) provided by operating activities of continuing operations	0	0
INVESTING ACTIVITIES
Additions to property and equipment	0	0
Other	0	0
Net cash used in investing activities of continuing operations	0	0
FINANCING ACTIVITIES
Cash dividends paid	0	0
Commercial paper borrowings, net		0
Proceeds from exercise of share options	0	0
Reduction of long-term borrowings	0	0
Advances (to) from affiliates	0	0
Other	0	0
Net cash used in financing activities of continuing operations	0	0
DISCONTINUED OPERATIONS
Operating activities	0	0
Investing activities	0
Net cash provided by (used in) discontinued operations	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	0	0
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	0	0
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 0	$ 0

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Supplemental Financial Information Supplemental Financial Information (Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Supplemental Financial Information [Abstract]
Derivative Instruments	$ 19.4	$ 24.4
Other	(4.4)	(4.3)
Accumulated other comprehensive income	$ 15.0	$ 20.1

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Derivative Instruments

3 Months Ended

Mar. 31, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments

Derivative Instruments

Our functional currency is the U.S. dollar. As is customary in the oil and gas industry, a majority of our revenues are denominated in U.S. dollars; however, a portion of the revenues earned and expenses incurred by some 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. We use foreign currency forward contracts ("derivatives") to reduce our exposure to various market risks, primarily foreign currency exchange rate risk.

All derivatives were recorded on our condensed consolidated balance sheets at fair value. Derivatives subject to legally enforceable master netting agreements were not offset in our condensed 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. Net liabilities of $3.3 million and net assets of $5.2 million associated with our foreign currency derivatives were included in our condensed consolidated balance sheets as of March 31, 2013 and December 31, 2012, respectively.  All of our derivatives mature during the next 18 months.  See "Note 2 - Fair Value Measurements" for additional information on the fair value measurement of our derivatives.

Derivatives recorded at fair value in our condensed consolidated balance sheets consisted of the following (in millions):

	Derivative Assets				Derivative Liabilities
	March 31, 2013		December 31, 2012		March 31, 2013		December 31, 2012
Derivatives Designated as Hedging Instruments
Foreign currency forward contracts - current(1)	$	3.7	$	5.0	$	5.1	$	.3
Foreign currency forward contracts - non-current(2)	.3		.5		1.0		—
	4.0		5.5		6.1		.3
Derivatives Not Designated as Hedging Instruments
Foreign currency forward contracts - current(1)	.1		.2		1.3		.2
	.1		.2		1.3		.2
Total	$	4.1	$	5.7	$	7.4	$	.5

⁽¹⁾  Derivative assets and liabilities that have maturity dates equal to or less than twelve months from the respective balance sheet date were included in other current assets and accrued liabilities and other, respectively, on our condensed consolidated balance sheets.

⁽²⁾  Derivative assets and liabilities that have maturity dates greater than twelve months from the respective balance sheet date were included in other assets, net, and other liabilities, respectively, on our condensed 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 denominated in various currencies. As of March 31, 2013, we had cash flow hedges outstanding to exchange an aggregate $368.3 million for various foreign currencies, including $140.0 million for British pounds, $138.8 million for Brazilian reais, $35.1 million for Singapore dollars, $23.4 million for Australian dollars, $21.9 million for euros and $9.1 million for other currencies.

Gains and losses, net of tax, on derivatives designated as cash flow hedges included in our condensed consolidated statements of income and our condensed consolidated statements of comprehensive income for the three-month periods ended March 31, 2013 and 2012 were as follows (in millions):

	(Loss) Gain Recognized in Other Comprehensive Income (Effective Portion)					(Loss) Gain Reclassified  from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion)(1)					Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)(2)
	2013			2012		2013			2012		2013		2012
Interest rate lock contracts(3)	$	—		$	—	$	(.1	)	$	.1	$	—	$	—
Foreign currency forward contracts(4)	(4.0		)	6.3		1.1			—		.2		(.8		)
Total	$	(4.0	)	$	6.3	$	1.0		$	.1	$	.2	$	(.8	)

⁽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 condensed consolidated statements of income.

⁽³⁾  Gains and losses on interest rate lock derivatives reclassified from AOCI into income (effective portion) were included in interest expense, net in our condensed consolidated statements of income.

⁽⁴⁾  During the three-month period ended March 31, 2013, $900,000 of gains were reclassified from AOCI to contract drilling expense and $200,000 of gains were reclassified from AOCI to depreciation expense in our condensed 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 March 31, 2013, we held derivatives not designated as hedging instruments to exchange an aggregate $175.8 million for various foreign currencies, including $86.1 million for euros, $23.1 million for British pounds, $17.2 million for Swiss francs, $14.2 million for Australian dollars and $35.2 million for other currencies.

Net losses of $4.4 million and net gains of $900,000 associated with our derivatives not designated as hedging instruments were included in other, net, in our condensed consolidated statements of income for the three-month periods ended March 31, 2013 and 2012, respectively.

As of March 31, 2013, the estimated amount of net gains associated with derivative instruments, net of tax, that would be reclassified to earnings during the next twelve months totaled $200,000.

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Supplemental Financial Information (Other Current Assets) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Supplemental Financial Information [Abstract]
Inventory	$ 215.9	$ 207.8
Prepaid taxes	60.9	62.2
Short-term investments	50.0	50.0
Deferred mobilization costs	29.6	33.7
Deferred tax assets	21.2	14.6
Prepaid expenses	14.5	20.3
Assets Held-for-sale, Current	0	14.2
Other	21.9	22.6
Other current assets	$ 414.0	$ 425.4

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Derivative Instruments (Schedule Of Derivatives At Fair Value) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Derivative [Line Items]
Total fair value of derivative assets	$ 4.1		$ 5.7
Total fair value of derivative liabilities	7.4		0.5
Designated As Hedging Instrument [Member]
Derivative [Line Items]
Total fair value of derivative assets	4.0		5.5
Total fair value of derivative liabilities	6.1		0.3
Designated As Hedging Instrument [Member] | Foreign Currency Forward Contracts - Current [Member]
Derivative [Line Items]
Total fair value of derivative assets	3.7	[1]	5.0	[1]
Total fair value of derivative liabilities	5.1	[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	0.3	[2]	0.5	[2]
Total fair value of derivative liabilities	1.0	[2]	0	[2]
Not Designated [Member]
Derivative [Line Items]
Total fair value of derivative assets	0.1		0.2
Total fair value of derivative liabilities	1.3		0.2
Not Designated [Member] | Foreign Currency Forward Contracts - Current [Member]
Derivative [Line Items]
Total fair value of derivative assets	0.1	[1]	0.2	[1]
Total fair value of derivative liabilities	$ 1.3	[1]	$ 0.2	[1]

[1] Derivative assets and liabilities that have maturity dates equal to or less than twelve months from the respective balance sheet date were included in other current assets and accrued liabilities and other, respectively, on our condensed consolidated balance sheets.

[2] Derivative assets and liabilities that have maturity dates greater than twelve months from the respective balance sheet date were included in other assets, net, and other liabilities, respectively, on our condensed consolidated balance sheets.

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Derivative Instruments (Narrative) (Details) (USD $)	3 Months Ended		3 Months Ended
	Mar. 31, 2013	Dec. 31, 2010	Mar. 31, 2013 Not Designated [Member]	Mar. 31, 2012 Not Designated [Member]	Mar. 31, 2013 Foreign Exchange [Member] Cash Flow Hedges [Member]	Mar. 31, 2013 Foreign Exchange [Member] Not Designated [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Liability, Fair Value, Net	$ (3,300,000)
Net assets associated with foreign currency derivatives		5,200,000
Maturity period of derivatives (in months)	18 months
Aggregate cash flow hedges outstanding					368,300,000	175,800,000
British pounds					140,000,000
Brazilian Reais Cash Flow Hedges Outstanding					138,800,000
Singapore dollars					35,100,000	23,100,000
Australian dollars					23,400,000
Euros					21,900,000	86,100,000
Other currencies					9,100,000	35,200,000
Swiss francs						17,200,000
Indonesian rupiahs						14,200,000
Net gain (Loss) on derivatives not designated as hedging instruments			$ (4,400,000)	$ 900,000
Derivative, Higher Remaining Maturity Range	18 months

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Supplemental Financial Information (Other Assets, Net) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Supplemental Financial Information [Abstract]
Intangible assets	$ 115.0	$ 143.3
Unbilled reimbursable receivables	74.9	77.1
Prepaid taxes on intercompany transfers of property	56.8	58.3
Supplemental executive retirement plan assets	35.2	29.8
Warranty and other claim receivables	30.6	30.6
Deferred tax assets	19.0	19.3
Deferred mobilization costs	12.2	20.8
Wreckage and debris removal receivables	5.9	13.2
Other	28.8	29.4
Other Assets, Net	$ 378.4	$ 421.8

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Derivative Instruments (Gains And Losses On Derivatives Designated As Cash Flow Hedges) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Derivative [Line Items]
Net Gains To Be Reclassified To Earnings	$ 200,000
Interest Rate Lock Contracts [Member]
Derivative [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income ("OCI") (Effective Portion)	0	[1]	0	[1]
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion)	(100,000)	[2]	100,000	[2]
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)	0	[1],[3]	0	[1],[3]
Foreign Currency Forward Contracts [Member]
Derivative [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income ("OCI") (Effective Portion)	(4,000,000)	[1]	6,300,000	[1]
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion)	1,100,000	[1]	0	[1]
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)	200,000	[1],[3]	(800,000)	[1],[3]
Foreign Currency Forward Contracts [Member] | Contract Drilling [Member]
Derivative [Line Items]
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion)	900,000	[1]
Foreign Currency Forward Contracts [Member] | Depreciation Expense [Member]
Derivative [Line Items]
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion)	200,000	[1]
Cash Flow Hedges [Member]
Derivative [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income ("OCI") (Effective Portion)	(4,000,000)		6,300,000
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion)	1,000,000		100,000
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)	$ 200,000	[3]	$ (800,000)	[3]

[1] During the three-month period ended March 31, 2013

[2] osses on interest rate lock derivatives reclassified from AOCI into income (effective portion) were included in interest expense, net in our condensed consolidated statements of income.

[3] Gains and losses recognized in income for ineffectiveness and amounts excluded from effectiveness testing were included in other, net, in our condensed consolidated statements of income.

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Noncontrolling Interests (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Noncontrolling Interest [Line Items]
Income from continuing operations	$ 320.8	$ 280.5
Income from continuing operations attributable to noncontrolling interests	(2.8)	(2.0)
Income from continuing operations attributable to Ensco	$ 318.0	$ 278.5

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Fair Value Measurements

3 Months Ended

Mar. 31, 2013

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

The following fair value hierarchy table categorizes information regarding our financial assets and liabilities measured at fair value on a recurring basis (in millions):

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)		Total
As of March 31, 2013
Supplemental executive retirement plan assets	$	35.2	$	—		$	—	$	35.2
Total financial assets	$	35.2	$	—		$	—	$	35.2
Derivatives, net	$	—	$	(3.3	)	$	—	$	(3.3	)
Total financial liabilities	$	—	$	(3.3	)	$	—	$	(3.3	)
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		$	—	$	35.0

Supplemental Executive Retirement Plan Assets

Our Ensco supplemental executive retirement plans (the "SERP") are non-qualified plans that accord eligible employees an opportunity 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 condensed consolidated balance sheets. The fair value measurement of assets held in the SERP was based on quoted market prices.

Derivatives

Our derivatives were measured at fair value on a recurring basis using Level 2 inputs as of March 31, 2013 and December 31, 2012. See "Note 3 - 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 measurement of our derivatives was based on market prices that generally are observable for similar assets or liabilities at commonly-quoted intervals.

Other Financial Instruments

The carrying values and estimated fair values of our long-term debt instruments were as follows (in millions):

	March 31, 2013				December 31, 2012
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
4.70% Senior notes due 2021	$	1,475.3	$	1,679.6	$	1,474.7	$	1,715.6
6.875% Senior notes due 2020	1,036.9		1,123.5		1,040.6		1,138.3
3.25% Senior notes due 2016	995.3		1,066.1		995.1		1,068.9
8.50% Senior notes due 2019	612.5		661.9		616.4		661.7
7.875% Senior notes due 2040	383.5		433.3		383.8		423.9
7.20% Debentures due 2027	149.0		189.3		149.0		193.2
4.33% MARAD bonds, including current maturities, due 2016	104.3		105.0		112.3		113.0
6.36% MARAD bonds, including current maturities, due 2015	38.0		41.2		38.0		41.7
4.65% MARAD bonds, including current maturities, due 2020	36.0		41.1		36.0		41.4
Total	$	4,830.8	$	5,341.0	$	4,845.9	$	5,397.7

The estimated fair values of our senior notes and debentures were determined using quoted market prices. The estimated fair values of our 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 March 31, 2013 and December 31, 2012.

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Earnings Per Share (Reconciliation Of Net Income Attributable To Ensco Shares) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share [Abstract]
Net income attributable to Ensco	$ 317.1	$ 265.4
Net income allocated to non-vested share awards	(3.3)	(2.7)
Net income attributable to Ensco shares	$ 313.8	$ 262.7

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Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details)	3 Months Ended
	Mar. 31, 2013
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	73	[1]
Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	28
Jackups [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	45
North & South America (Excl. Brazil) [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	22	[1]
North & South America (Excl. Brazil) [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	8
North & South America (Excl. Brazil) [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	14
Brazil [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	10	[1]
Brazil [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	10
Brazil [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	0
Europe & Mediterranean [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	9	[1]
Europe & Mediterranean [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	1
Europe & Mediterranean [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	8
Middle East & Africa [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	13	[1]
Middle East & Africa [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	4
Middle East & Africa [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	9
Asia & Pacific Rim [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	13	[1]
Asia & Pacific Rim [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	2
Asia & Pacific Rim [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	11
Asia & Pacific Rim (under construction) [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	6	[1]
Asia & Pacific Rim (under construction) [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	3
Asia & Pacific Rim (under construction) [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	3

[1] We provide management services on three rigs owned by third-parties not included in the table above.

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Condensed Consolidated Statements Of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Statement [Abstract]
OPERATING REVENUES	$ 1,149.9	$ 1,020.6
OPERATING EXPENSES
Contract drilling (exclusive of depreciation)	560.8	502.2
Depreciation	149.0	136.0
General and administrative	37.8	38.2
Total operating expenses	747.6	676.4
OPERATING INCOME	402.3	344.2
OTHER INCOME (EXPENSE)
Interest income	3.3	5.9
Interest expense, net	(39.2)	(34.6)
Other, net	6.1	2.0
Other income (expense), net	(29.8)	(26.7)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	372.5	317.5
PROVISION FOR INCOME TAXES
Current income tax expense	62.2	32.3
Deferred income tax (benefit) expense	(10.5)	4.7
Total provision for income taxes	51.7	37.0
INCOME FROM CONTINUING OPERATIONS	320.8	280.5
DISCONTINUED OPERATIONS
Income (loss) from discontinued operations, net	0.2	(13.1)
Loss on disposal of discontinued operations, net	(1.1)	0
DISCONTINUED OPERATIONS, NET	(0.9)	(13.1)
NET INCOME	319.9	267.4
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(2.8)	(2.0)
NET INCOME ATTRIBUTABLE TO ENSCO	317.1	265.4
EARNINGS PER SHARE - BASIC
Continuing operations (in dollars per share)	$ 1.37	$ 1.21
Discontinued operations (in dollars per share)	$ (0.01)	$ (0.06)
Total earnings per share - basic (in dollars per share)	$ 1.36	$ 1.15
EARNINGS PER SHARE - DILUTED
Continuing operations (in dollars per share)	$ 1.36	$ 1.20
Discontinued operations (in dollars per share)	$ 0.00	$ (0.05)
Total earnings per share - diluted (in dollars per share)	$ 1.36	$ 1.15
NET INCOME ATTRIBUTABLE TO ENSCO SHARES - BASIC AND DILUTED	$ 313.8	$ 262.7
WEIGHTED-AVERAGE SHARES OUTSTANDING
Basic (in shares)	230.3	228.8
Diluted (in shares)	230.6	229.2
CASH DIVIDENDS PER SHARE (in dollars per share)	$ 0.50	$ 0.375

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Supplemental Financial Information (Accrued Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Supplemental Financial Information [Abstract]
Personnel costs	$ 165.6	$ 231.1
Deferred revenue	142.3	146.2
Taxes	93.9	86.9
Accrued interest	36.0	67.9
Wreckage and debris removal	5.0	9.0
Other	46.2	43.3
Accrued liabilities and other	$ 489.0	$ 584.4

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Condensed Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
OPERATING ACTIVITIES
Net income	$ 319.9	$ 267.4
Adjustments to reconcile net income to net cash provided by operating activities:
Discontinued operations, net	0.9	13.1
Depreciation expense	149.0	136.0
Share-based compensation expense	12.8	11.7
Deferred income tax (benefit) expense	(10.5)	4.7
Amortization of intangibles and other, net	(9.3)	(13.1)
Other	(7.0)	2.7
Changes in operating assets and liabilities	(113.7)	133.1
Net cash provided by operating activities of continuing operations	342.1	555.6
INVESTING ACTIVITIES
Additions to property and equipment	(168.3)	(764.1)
Other	0.9	5.1
Net cash used in investing activities of continuing operations	(167.4)	(759.0)
FINANCING ACTIVITIES
Cash dividends paid	(116.5)	(86.8)
Proceeds from exercise of share options	13.4	11.9
Reduction of long-term borrowings	(7.1)	(7.1)
Commercial paper borrowings, net	0	75.0
Other	(5.5)	(3.6)
Net cash used in financing activities of continuing operations	(115.7)	(10.6)
DISCONTINUED OPERATIONS
Operating activities	0.2	(8.3)
Investing activities	15.5	0
Net cash provided by (used in) discontinued operations	15.7	(8.3)
Effect of exchange rate changes on cash and cash equivalents	0	0.5
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	74.7	(221.8)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	487.1	430.7
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 561.8	$ 208.9

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Discontinued Operations (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012 Jackup Rigs [Member] rigs	Dec. 31, 2012 Moored Semisubmersible Rigs [Member] rigs	Dec. 31, 2012 Barge Rig [Member] rigs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from rig sale	$ 15.5
Loss on disposal of discontinued operations, net	$ 1.1	$ 0
Number of rigs sold			3	1	1

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Discontinued Operations (Tables)

3 Months Ended

Mar. 31, 2013

Discontinued Operations and Disposal Groups [Abstract]

Summary of Loss from Discontinued Operations

The following table summarizes loss from discontinued operations for the three-month periods ended March 31, 2013 and 2012 (in millions):

	2013			2012
Revenues	$	—		$	5.8
Operating expenses	.1			21.4
Operating loss before income taxes	(.1		)	(15.6		)
Other income	.3			.5
Income tax benefit	—			2.0
Loss on disposal of discontinued operations, net	(1.1		)	—
Loss from discontinued operations	$	(.9	)	$	(13.1	)

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Discontinued Operations (Summary Of Income From Discontinued Operations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Discontinued Operations and Disposal Groups [Abstract]
Revenues	$ 0	$ 5.8
Operating expenses	0.1	21.4
Operating loss before income taxes	(0.1)	(15.6)
Other income	0.3	0.5
Income tax benefit	0	2.0
Loss on disposal of discontinued operations, net	(1.1)	0
DISCONTINUED OPERATIONS, NET	$ (0.9)	$ (13.1)

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Supplemental Financial Information (Tables)

3 Months Ended

Mar. 31, 2013

Supplemental Financial Information [Abstract]

Accounts Receivable, Net

Accounts receivable, net, consisted of the following (in millions):

	March 31, 2013			December 31, 2012
Trade	$	814.8		$	812.4
Other	12.2			18.2
	827.0			830.6
Allowance for doubtful accounts	(17.9		)	(19.2		)
	$	809.1		$	811.4

Other Current Assets

Other current assets consisted of the following (in millions):

	March 31, 2013		December 31, 2012
Inventory	$	215.9	$	207.8
Prepaid taxes	60.9		62.2
Short-term investments	50.0		50.0
Deferred mobilization costs	29.6		33.7
Deferred tax assets	21.2		14.6
Prepaid expenses	14.5		20.3
Assets held for sale	—		14.2
Other	21.9		22.6
	$	414.0	$	425.4

Other Assets, Net

Other assets, net, consisted of the following (in millions):

	March 31, 2013		December 31, 2012
Intangible assets	$	115.0	$	143.3
Unbilled receivables	74.9		77.1
Prepaid taxes on intercompany transfers of property	56.8		58.3
Supplemental executive retirement plan assets	35.2		29.8
Warranty and other claim receivables	30.6		30.6
Deferred tax assets	19.0		19.3
Deferred mobilization costs	12.2		20.8
Wreckage and debris removal receivables	5.9		13.2
Other	28.8		29.4
	$	378.4	$	421.8

Accrued Liabilities And Other

Accrued liabilities and other consisted of the following (in millions):

	March 31, 2013		December 31, 2012
Personnel costs	$	165.6	$	231.1
Deferred revenue	142.3		146.2
Taxes	93.9		86.9
Interest	36.0		67.9
Wreckage and debris removal	5.0		9.0
Other	46.2		43.3
	$	489.0	$	584.4

Other Liabilities

Other liabilities consisted of the following (in millions):

	March 31, 2013		December 31, 2012
Deferred revenue	$	215.7	$	224.5
Unrecognized tax benefits (inclusive of interest and penalties)	132.4		129.6
Intangible liabilities	101.9		118.0
Supplemental executive retirement plan liabilities	38.4		33.3
Personnel costs	28.4		31.6
Other	31.6		36.4
	$	548.4	$	573.4

Accumulated Other Comprehensive Income

Accumulated other comprehensive income consisted of the following (in millions):

	March 31, 2013			December 31, 2012
Derivative Instruments	$	19.4		$	24.4
Other	(4.4		)	(4.3		)
	$	15.0		$	20.1

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Unaudited Condensed Consolidated Financial Statements

3 Months Ended

Mar. 31, 2013

Unaudited Condensed Consolidated Financial Statements [Abstract]

Unaudited Condensed Consolidated Financial Statements

Unaudited Condensed Consolidated Financial Statements

We prepared the accompanying condensed consolidated financial statements of Ensco plc and subsidiaries (the "Company," "Ensco," "our," "we" or "us") in accordance with accounting principles generally accepted in the United States of America ("GAAP"), pursuant to the rules and regulations of the Securities and Exchange Commission (the "SEC") included in the instructions to Form 10-Q and Article 10 of Regulation S-X. The financial information included in this report is unaudited but, in our opinion, includes all adjustments (consisting of normal recurring adjustments) that are necessary for a fair presentation of our financial position, results of operations and cash flows for the interim periods presented. The December 31, 2012 condensed consolidated balance sheet data were derived from our 2012 audited consolidated financial statements, but do not include all disclosures required by GAAP. Certain previously reported amounts have been reclassified to conform to the current year presentation. The preparation of our condensed consolidated financial statements 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.

The financial data for the three-month periods ended March 31, 2013 and 2012 included herein have been subjected to a limited review by KPMG LLP, our independent registered public accounting firm. The accompanying independent registered public accounting firm's review report is not a report within the meaning of Sections 7 and 11 of the Securities Act of 1933, and the independent registered public accounting firm's liability under Section 11 does not extend to it.

Results of operations for the three-month period ended March 31, 2013 are not necessarily indicative of the results of operations that will be realized for the year ending December 31, 2013. It is recommended that these condensed consolidated financial statements be read in conjunction with our audited consolidated financial statements and notes thereto for the year ended December 31, 2012 included in our annual report on Form 10-K filed with the SEC on February 22, 2013.

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Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Comprehensive Income [Abstract]
NET INCOME	$ 319.9	$ 267.4
OTHER COMPREHENSIVE (LOSS) INCOME, NET
Net change in fair value of derivatives	(4.0)	6.3
Reclassification of net gains and losses on derivative instruments from other comprehensive income into net income	(1.0)	(0.1)
Other	(0.1)	(1.9)
NET OTHER COMPREHENSIVE (LOSS) INCOME	(5.1)	4.3
COMPREHENSIVE INCOME	314.8	271.7
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(2.8)	(2.0)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	$ 312.0	$ 269.7

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Guarantee Of Registered Securities

3 Months Ended

Mar. 31, 2013

Guarantees [Abstract]

Guarantee Of Registered Securities

Guarantee of Registered Securities

On May 31, 2011, Ensco plc completed a merger transaction (the "Merger") with Pride International Inc. ("Pride"). 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 8.50% unsecured senior notes due 2019, 6.875% unsecured senior notes due 2020 and 7.875% unsecured senior notes due 2040, which had an aggregate outstanding principal balance as of March 31, 2013 of $1.7 billion. 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 also is a full and unconditional guarantor of the 7.20% debentures due 2027 issued by Ensco International, Inc. in November 1997, which had an aggregate outstanding principal balance of $150.0 million as of March 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 the unaudited condensed consolidating statements of income for the three-month periods ended March 31, 2013 and 2012; the unaudited condensed consolidating statements of comprehensive income for the three-month periods ended March 31, 2013 and 2012; the condensed consolidating balance sheets as of March 31, 2013 (unaudited) and December 31, 2012; and the unaudited condensed consolidating statements of cash flows for the three-month periods ended March 31, 2013 and 2012, in accordance with Rule 3-10 of Regulation S-X.

ENSCO PLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF INCOME Three Months Ended March 31, 2013 (in millions) (Unaudited)
	Ensco plc			ENSCO International Incorporated			Pride International, Inc.			Other Non-Guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
OPERATING REVENUES	$	5.5		$	38.1		$	—		$	1,183.7		$	(77.4	)	$	1,149.9
OPERATING EXPENSES
Contract drilling (exclusive of depreciation)	12.4			38.1			—			587.7			(77.4		)	560.8
Depreciation	.1			.8			—			148.1			—			149.0
General and administrative	16.9			.2			—			20.7			—			37.8
OPERATING (LOSS) INCOME	(23.9		)	(1.0		)	—			427.2			—			402.3
OTHER (EXPENSE) INCOME, NET	(14.6		)	(7.4		)	(14.6		)	6.8			—			(29.8		)
(LOSS) INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(38.5		)	(8.4		)	(14.6		)	434.0			—			372.5
INCOME TAX PROVISION	—			29.5			—			22.2			—			51.7
DISCONTINUED OPERATIONS, NET	—			—			—			(.9		)	—			(.9		)
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	355.6			111.7			52.4			—			(519.7		)	—
NET INCOME	317.1			73.8			37.8			410.9			(519.7		)	319.9
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—			—			—			(2.8		)	—			(2.8		)
NET INCOME ATTRIBUTABLE TO ENSCO	$	317.1		$	73.8		$	37.8		$	408.1		$	(519.7	)	$	317.1

ENSCO PLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF INCOME Three Months Ended March 31, 2012 (in millions) (Unaudited)
	Ensco plc			ENSCO International Incorporated			Pride International, Inc.			Other Non-Guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
OPERATING REVENUES	$	21.9		$	10.6		$	—		$	1,037.0		$	(48.9	)	$	1,020.6
OPERATING EXPENSES
Contract drilling (exclusive of depreciation)	6.9			10.6			—			533.6			(48.9		)	502.2
Depreciation	.1			.8			—			135.1			—			136.0
General and administrative	14.6			—			—			23.6			—			38.2
OPERATING INCOME (LOSS)	.3			(.8		)	—			344.7			—			344.2
OTHER EXPENSE, NET	(11.2		)	(.3		)	(11.7		)	(3.5		)	—			(26.7		)
(LOSS) INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(10.9		)	(1.1		)	(11.7		)	341.2			—			317.5
INCOME TAX PROVISION	—			11.2			—			25.8			—			37.0
DISCONTINUED OPERATIONS, NET	—			—			—			(13.1		)	—			(13.1		)
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	276.3			44.2			79.7			—			(400.2		)	—
NET INCOME	265.4			31.9			68.0			302.3			(400.2		)	267.4
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—			—			—			(2.0		)	—			(2.0		)
NET INCOME ATTRIBUTABLE TO ENSCO	$	265.4		$	31.9		$	68.0		$	300.3		$	(400.2	)	$	265.4

ENSCO PLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

Three Months Ended March 31, 2013

(in millions)

(Unaudited)

	Ensco plc		ENSCO International Incorporated			Pride International, Inc.		Other Non-Guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
NET INCOME	$	317.1	$	73.8		$	37.8	$	410.9		$	(519.7	)	$	319.9
OTHER COMPREHENSIVE (LOSS) INCOME, NET
Net change in fair value of derivatives	—		(4.0		)	—		—			—			(4.0		)
Reclassification of net gains and losses on derivative instruments from other comprehensive loss (income) into net income	—		.1			—		(1.1		)	—			(1.0		)
Other	—		—			—		(.1		)	—			(.1		)
NET OTHER COMPREHENSIVE LOSS	—		(3.9		)	—		(1.2		)	—			(5.1		)
COMPREHENSIVE INCOME	317.1		69.9			37.8		409.7			(519.7		)	314.8
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—		—			—		(2.8		)	—			(2.8		)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	$	317.1	$	69.9		$	37.8	$	406.9		$	(519.7	)	$	312.0

ENSCO PLC AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

Three Months Ended March 31, 2012

(in millions)

(Unaudited)

	Ensco plc		ENSCO International Incorporated		Pride International, Inc.		Other Non-Guarantor Subsidiaries of Ensco			Consolidating Adjustments			Total
NET INCOME	$	265.4	$	31.9	$	68.0	$	302.3		$	(400.2	)	$	267.4
OTHER COMPREHENSIVE (LOSS) INCOME, NET
Net change in fair value of derivatives	—		1.9		—		4.4			—			6.3
Reclassification of net gains and losses on derivative instruments from other comprehensive loss (income) into net income	—		.1		—		(.2		)	—			(.1		)
Other	—		—		—		(1.9		)	—			(1.9		)
NET OTHER COMPREHENSIVE (LOSS) INCOME	—		2.0		—		2.3			—			4.3
COMPREHENSIVE INCOME	265.4		33.9		68.0		304.6			(400.2		)	271.7
COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—		—		—		(2.0		)	—			(2.0		)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSCO	$	265.4	$	33.9	$	68.0	$	302.6		$	(400.2	)	$	269.7

ENSCO PLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS March 31, 2013 (in millions) (Unaudited)
	Ensco plc		ENSCO International Incorporated		Pride International, Inc.		Other Non-Guarantor Subsidiaries of Ensco		Consolidating Adjustments			Total
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	289.1	$	—	$	115.0	$	157.7	$	—		$	561.8
Accounts receivable, net	—		.3		—		808.8		—			809.1
Accounts receivable from affiliates	1,296.2		166.4		1.4		1,577.1		(3,041.1		)	—
Other	2.9		24.8		—		386.3		—			414.0
Total current assets	1,588.2		191.5		116.4		2,929.9		(3,041.1		)	1,784.9
PROPERTY AND EQUIPMENT, AT COST	2.1		30.1		—		15,861.4		—			15,893.6
Less accumulated depreciation	1.2		23.6		—		2,713.6		—			2,738.4
Property and equipment, net	.9		6.5		—		13,147.8		—			13,155.2
GOODWILL	—		—		—		3,274.0		—			3,274.0
DUE FROM AFFILIATES	2,677.0		3,758.5		1,640.4		5,125.2		(13,201.1		)	—
INVESTMENTS IN AFFILIATES	13,831.0		2,799.8		3,836.2		—		(20,467.0		)	—
OTHER ASSETS, NET	10.7		64.8		—		302.9		—			378.4
	$	18,107.8	$	6,821.1	$	5,593.0	$	24,779.8	$	(36,709.2	)	$	18,592.5
LIABILITIES AND SHAREHOLDERS' EQUITY
CURRENT LIABILITIES
Accounts payable and accrued liabilities	$	4.9	$	47.5	$	23.4	$	722.1	$	—		$	797.9
Accounts payable to affiliates	1,653.7		56.5		—		1,330.9		(3,041.1		)	—
Current maturities of long-term debt	—		—		—		47.5		—			47.5
Total current liabilities	1,658.6		104.0		23.4		2,100.5		(3,041.1		)	845.4
DUE TO AFFILIATES	1,910.0		2,260.6		954.6		8,075.9		(13,201.1		)	—
LONG-TERM DEBT	2,470.6		149.1		2,032.7		130.9		—			4,783.3
DEFERRED INCOME TAXES	—		325.2		—		21.6		—			346.8
OTHER LIABILITIES	—		1.0		10.5		536.9		—			548.4
ENSCO SHAREHOLDERS' EQUITY	12,068.6		3,981.2		2,571.8		13,907.5		(20,467.0		)	12,062.1
NONCONTROLLING INTERESTS	—		—		—		6.5		—			6.5
Total equity	12,068.6		3,981.2		2,571.8		13,914.0		(20,467.0		)	12,068.6
	$	18,107.8	$	6,821.1	$	5,593.0	$	24,779.8	$	(36,709.2	)	$	18,592.5

ENSCO PLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS December 31, 2012 (in millions)
	Ensco plc		ENSCO International Incorporated		Pride International, Inc.		Other Non-Guarantor Subsidiaries of Ensco		Consolidating Adjustments			Total
ASSETS
CURRENT ASSETS
Cash and cash equivalents	$	271.8	$	1.7	$	85.0	$	128.6	$	—		$	487.1
Accounts receivable, net	—		.2		—		811.2		—			811.4
Accounts receivable from affiliates	1,294.5		226.5		—		2,375.1		(3,896.1		)	—
Other	2.8		24.9		—		397.7		—			425.4
Total current assets	1,569.1		253.3		85.0		3,712.6		(3,896.1		)	1,723.9
PROPERTY AND EQUIPMENT, AT COST	2.1		30.2		—		15,704.8		—			15,737.1
Less accumulated depreciation	1.1		23.5		—		2,566.9		—			2,591.5
Property and equipment, net	1.0		6.7		—		13,137.9		—			13,145.6
GOODWILL	—		—		—		3,274.0		—			3,274.0
DUE FROM AFFILIATES	3,483.5		3,594.7		1,628.4		4,748.9		(13,455.5		)	—
INVESTMENTS IN AFFILIATES	13,469.3		2,693.8		3,824.8		—		(19,987.9		)	—
OTHER ASSETS, NET	11.3		67.4		—		343.1		—			421.8
	$	18,534.2	$	6,615.9	$	5,538.2	$	25,216.5	$	(37,339.5	)	$	18,565.3
LIABILITIES AND SHAREHOLDERS' EQUITY
CURRENT LIABILITIES
Accounts payable and accrued liabilities	$	31.0	$	28.1	$	34.1	$	849.0	$	—		$	942.2
Accounts payable to affiliates	2,364.8		136.9		—		1,394.4		(3,896.1		)	—
Current maturities of long-term debt	—		—		—		47.5		—			47.5
Total current liabilities	2,395.8		165.0		34.1		2,290.9		(3,896.1		)	989.7
DUE TO AFFILIATES	1,816.7		2,054.7		877.5		8,706.6		(13,455.5		)	—
LONG-TERM DEBT	2,469.6		149.0		2,040.8		139.0		—			4,798.4
DEFERRED INCOME TAXES	—		335.1		—		16.6		—			351.7
OTHER LIABILITIES	—		—		10.8		562.6		—			573.4
ENSCO SHAREHOLDERS' EQUITY	11,852.1		3,912.1		2,575.0		13,495.1		(19,987.9		)	11,846.4
NONCONTROLLING INTERESTS	—		—		—		5.7		—			5.7
Total equity	11,852.1		3,912.1		2,575.0		13,500.8		(19,987.9		)	11,852.1
	$	18,534.2	$	6,615.9	$	5,538.2	$	25,216.5	$	(37,339.5	)	$	18,565.3

ENSCO PLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS Three Months Ended March 31, 2013 (in millions) (Unaudited)
	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      operatingactivities of continuing operations	$	(55.3	)	$	(34.0	)	$	11.3	$	420.1		$	—	$	342.1
INVESTING ACTIVITIES
Additions to property and equipment	—			—			—		(168.3		)	—		(168.3		)
Other	—			.1			—		.8			—		.9
Net cash provided by (used in) investing activities of continuing operations	—			.1			—		(167.5		)	—		(167.4		)
FINANCING ACTIVITIES
Cash dividends paid	(116.5		)	—			—		—			—		(116.5		)
Proceeds from exercise of share   options	13.4			—			—		—			—		13.4
Reduction of long-term borrowings	—			—			—		(7.1		)	—		(7.1		)
Advances from (to) affiliates	179.4			32.2			18.7		(230.3		)	—		—
Other	(3.7		)	—			—		(1.8		)	—		(5.5		)
Net cash provided by (used in)          financing activities of     continuing operations	72.6			32.2			18.7		(239.2		)	—		(115.7		)
DISCONTINUED OPERATIONS
Operating activities	—			—			—		.2			—		.2
Investing activities	—			—			—		15.5			—		15.5
Net cash provided by discontinued operations	—			—			—		15.7			—		15.7
Effect of exchange rate changes on cash and cash equivalents	—			—			—		—			—		—
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	17.3			(1.7		)	30.0		29.1			—		74.7
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	271.8			1.7			85.0		128.6			—		487.1
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	289.1		$	—		$	115.0	$	157.7		$	—	$	561.8

ENSCO PLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS Three Months Ended March 31, 2012 (in millions) (Unaudited)
	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      operatingactivities of continuing operations	$	(20.3	)	$	(21.8	)	$	(67.4	)	$	665.1		$	—	$	555.6
INVESTING ACTIVITIES
Additions to property and   equipment	—			—			—			(764.1		)	—		(764.1		)
Other	—			.7			—			4.4			—		5.1
Net cash provided by   (used in) investing activities of     continuing operations	—			.7			—			(759.7		)	—		(759.0		)
FINANCING ACTIVITIES
Cash dividends paid	(86.8		)	—			—			—			—		(86.8		)
Commercial paper borrowings,   net	75.0			—			—			—			—		75.0
Proceeds from exercise of share   options				11.9			—			—			—		11.9
Reduction of long-term borrowings	—			—			—			(7.1		)	—		(7.1		)
Advances (to) from affiliates	(192.3		)	22.8			74.1			95.4			—		—
Other	—			(.1		)	—			(3.5		)	—		(3.6		)
Net cash (used in) provided by          financing activities of   continuing operations	(204.1		)	34.6			74.1			84.8			—		(10.6		)
DISCONTINUED OPERATIONS
Operating activities	—			—			—			(8.3		)	—		(8.3		)
Net cash used in discontinued operations	—			—			—			(8.3		)	—		(8.3		)
Effect of exchange rate changes   on cash and cash equivalents	—			—			—			.5			—		.5
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(224.4		)	13.5			6.7			(17.6		)	—		(221.8		)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	236.6			—			22.6			171.5			—		430.7
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	12.2		$	13.5		$	29.3		$	153.9		$	—	$	208.9

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Document And Entity Information	3 Months Ended
	Mar. 31, 2013	Apr. 22, 2013
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q1
Entity Registrant Name	Ensco plc
Entity Central Index Key	0000314808
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Shares, Shares Outstanding		232,917,732

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 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 financial assets and liabilities measured at fair value on a recurring basis (in millions):

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)		Total
As of March 31, 2013
Supplemental executive retirement plan assets	$	35.2	$	—		$	—	$	35.2
Total financial assets	$	35.2	$	—		$	—	$	35.2
Derivatives, net	$	—	$	(3.3	)	$	—	$	(3.3	)
Total financial liabilities	$	—	$	(3.3	)	$	—	$	(3.3	)
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		$	—	$	35.0

Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments

The carrying values and estimated fair values of our long-term debt instruments were as follows (in millions):

	March 31, 2013				December 31, 2012
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
4.70% Senior notes due 2021	$	1,475.3	$	1,679.6	$	1,474.7	$	1,715.6
6.875% Senior notes due 2020	1,036.9		1,123.5		1,040.6		1,138.3
3.25% Senior notes due 2016	995.3		1,066.1		995.1		1,068.9
8.50% Senior notes due 2019	612.5		661.9		616.4		661.7
7.875% Senior notes due 2040	383.5		433.3		383.8		423.9
7.20% Debentures due 2027	149.0		189.3		149.0		193.2
4.33% MARAD bonds, including current maturities, due 2016	104.3		105.0		112.3		113.0
6.36% MARAD bonds, including current maturities, due 2015	38.0		41.2		38.0		41.7
4.65% MARAD bonds, including current maturities, due 2020	36.0		41.1		36.0		41.4
Total	$	4,830.8	$	5,341.0	$	4,845.9	$	5,397.7

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Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
CURRENT ASSETS
Cash and cash equivalents	$ 561.8	$ 487.1
Accounts receivable, net	809.1	811.4
Other	414.0	425.4
Total current assets	1,784.9	1,723.9
PROPERTY AND EQUIPMENT, AT COST	15,893.6	15,737.1
Less accumulated depreciation	2,738.4	2,591.5
Property and equipment, net	13,155.2	13,145.6
GOODWILL	3,274.0	3,274.0
OTHER ASSETS, NET	378.4	421.8
TOTAL ASSETS	18,592.5	18,565.3
CURRENT LIABILITIES
Accounts payable - trade	308.9	357.8
Accrued liabilities and other	489.0	584.4
Current maturities of long-term debt	47.5	47.5
Total current liabilities	845.4	989.7
LONG-TERM DEBT	4,783.3	4,798.4
DEFERRED INCOME TAXES	346.8	351.7
OTHER LIABILITIES	548.4	573.4
COMMITMENTS AND CONTINGENCIES
ENSCO SHAREHOLDERS' EQUITY
Additional paid-in capital	5,422.5	5,398.7
Retained earnings	6,635.3	6,434.7
Accumulated other comprehensive income	15.0	20.1
Treasury shares, at cost, 4.6 million shares and 4.9 million shares	(34.6)	(31.0)
Total Ensco shareholders' equity	12,062.1	11,846.4
NONCONTROLLING INTERESTS	6.5	5.7
Total equity	12,068.6	11,852.1
Total liabilities and shareholders' equity	18,592.5	18,565.3
Class A ordinary shares, U.S. [Member]
ENSCO SHAREHOLDERS' EQUITY
Common shares, value	23.8	23.8
Common Class B, Par Value In GBP [Member]
ENSCO SHAREHOLDERS' EQUITY
Common shares, value	$ 0.1	$ 0.1

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Income Taxes

3 Months Ended

Mar. 31, 2013

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

Our consolidated effective income tax rate for the three-month period ended March 31, 2013 of 13.9% included the impact of various discrete tax items, the majority of which was attributable to the recognition of a liability for unrecognized tax benefits of $4.9 million associated with a tax position taken in prior years. Excluding the impact of the aforementioned discrete tax items, our consolidated effective income tax rate for the three-month period ended March 31, 2013 was 12.2%, which is equivalent to the consolidated effective income tax rate, excluding discrete tax items, of 12.2% for the three-month period ended March 31, 2012.

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Earnings Per Share

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

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 the three-month periods ended March 31, 2013 and 2012 (in millions):

	2013			2012
Net income attributable to Ensco	$	317.1		$	265.4
Net income allocated to non-vested share awards	(3.3		)	(2.7		)
Net income attributable to Ensco shares	$	313.8		$	262.7

The following table is a reconciliation of the weighted-average shares outstanding used in our basic and diluted EPS computations for the three-month periods ended March 31, 2013 and 2012 (in millions):

	2013	2012
Weighted-average shares - basic	230.3	228.8
Potentially dilutive shares	.3	.4
Weighted-average shares - diluted	230.6	229.2

Antidilutive share options totaling 100,000 and 400,000 were excluded from the computation of diluted EPS for the three-month periods ended March 31, 2013 and 2012, respectively.

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Segment Information (Tables)

3 Months Ended

Mar. 31, 2013

Segment Reporting Information, Revenue for Reportable Segment [Abstract]

Schedule Of Segment Reporting Information

Three Months Ended March 31, 2013

	Floaters		Jackups		Other		Operating Segments Total		Reconciling Items			Consolidated Total
Revenues	$	719.2	$	410.5	$	20.2	$	1,149.9	$	—		$	1,149.9
Operating expenses
Contract drilling (exclusive of depreciation)	344.9		200.2		15.7		560.8		—			560.8
Depreciation	107.1		40.3		—		147.4		1.6			149.0
General and administrative	—		—		—		—		37.8			37.8
Operating income (loss)	$	267.2	$	170.0	$	4.5	$	441.7	$	(39.4	)	$	402.3
Property and equipment, net	$	10,710.0	$	2,413.3	$	—	$	13,123.3	$	31.9		$	13,155.2

Three Months Ended March 31, 2012

	Floaters		Jackups		Other		Operating Segments Total		Reconciling Items			Consolidated Total
Revenues	$	639.3	$	359.8	$	21.5	$	1,020.6	$	—		$	1,020.6
Operating expenses
Contract drilling (exclusive of depreciation)	312.9		173.6		15.7		502.2		—			502.2
Depreciation	91.0		41.4		—		132.4		3.6			136.0
General and administrative	—		—		—		—		38.2			38.2
Operating income (loss)	$	235.4	$	144.8	$	5.8	$	386.0	$	(41.8	)	$	344.2
Property and equipment, net	$	10,390.4	$	2,457.7	$	12.4	$	12,860.5	$	29.4		$	12,889.9

Schedule Of Geographic Distribution Of Rigs By Segment

As of March 31, 2013, the geographic distribution of our drilling rigs by operating segment was as follows:

	Floaters	Jackups	Total(1)
North & South America (excluding Brazil)	8	14	22
Brazil	10	—	10
Europe & Mediterranean	1	8	9
Middle East & Africa	4	9	13
Asia & Pacific Rim	2	11	13
Asia & Pacific Rim (under construction)	3	3	6
Total	28	45	73

⁽¹⁾   We provide management services on three rigs owned by third-parties not included in the table above. 

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Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule Of Derivatives At Fair Value

Derivatives recorded at fair value in our condensed consolidated balance sheets consisted of the following (in millions):

	Derivative Assets				Derivative Liabilities
	March 31, 2013		December 31, 2012		March 31, 2013		December 31, 2012
Derivatives Designated as Hedging Instruments
Foreign currency forward contracts - current(1)	$	3.7	$	5.0	$	5.1	$	.3
Foreign currency forward contracts - non-current(2)	.3		.5		1.0		—
	4.0		5.5		6.1		.3
Derivatives Not Designated as Hedging Instruments
Foreign currency forward contracts - current(1)	.1		.2		1.3		.2
	.1		.2		1.3		.2
Total	$	4.1	$	5.7	$	7.4	$	.5

⁽¹⁾  Derivative assets and liabilities that have maturity dates equal to or less than twelve months from the respective balance sheet date were included in other current assets and accrued liabilities and other, respectively, on our condensed consolidated balance sheets.

⁽²⁾  Derivative assets and liabilities that have maturity dates greater than twelve months from the respective balance sheet date were included in other assets, net, and other liabilities, respectively, on our condensed 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 condensed consolidated statements of income and our condensed consolidated statements of comprehensive income for the three-month periods ended March 31, 2013 and 2012 were as follows (in millions):

	(Loss) Gain Recognized in Other Comprehensive Income (Effective Portion)					(Loss) Gain Reclassified  from Accumulated Other Comprehensive Income ("AOCI") into Income (Effective Portion)(1)					Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)(2)
	2013			2012		2013			2012		2013		2012
Interest rate lock contracts(3)	$	—		$	—	$	(.1	)	$	.1	$	—	$	—
Foreign currency forward contracts(4)	(4.0		)	6.3		1.1			—		.2		(.8		)
Total	$	(4.0	)	$	6.3	$	1.0		$	.1	$	.2	$	(.8	)

⁽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 condensed consolidated statements of income.

⁽³⁾  Gains and losses on interest rate lock derivatives reclassified from AOCI into income (effective portion) were included in interest expense, net in our condensed consolidated statements of income.

⁽⁴⁾  During the three-month period ended March 31, 2013

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Segment Information

3 Months Ended

Mar. 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 currently consists of management services on rigs owned by third-parties. Our two reportable segments, Floaters and Jackups, provide one service, contract drilling.

Segment information 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. Prior year information has been reclassified to conform to the current year presentation.

Three Months Ended March 31, 2013

	Floaters		Jackups		Other		Operating Segments Total		Reconciling Items			Consolidated Total
Revenues	$	719.2	$	410.5	$	20.2	$	1,149.9	$	—		$	1,149.9
Operating expenses
Contract drilling (exclusive of depreciation)	344.9		200.2		15.7		560.8		—			560.8
Depreciation	107.1		40.3		—		147.4		1.6			149.0
General and administrative	—		—		—		—		37.8			37.8
Operating income (loss)	$	267.2	$	170.0	$	4.5	$	441.7	$	(39.4	)	$	402.3
Property and equipment, net	$	10,710.0	$	2,413.3	$	—	$	13,123.3	$	31.9		$	13,155.2

Three Months Ended March 31, 2012

	Floaters		Jackups		Other		Operating Segments Total		Reconciling Items			Consolidated Total
Revenues	$	639.3	$	359.8	$	21.5	$	1,020.6	$	—		$	1,020.6
Operating expenses
Contract drilling (exclusive of depreciation)	312.9		173.6		15.7		502.2		—			502.2
Depreciation	91.0		41.4		—		132.4		3.6			136.0
General and administrative	—		—		—		—		38.2			38.2
Operating income (loss)	$	235.4	$	144.8	$	5.8	$	386.0	$	(41.8	)	$	344.2
Property and equipment, net	$	10,390.4	$	2,457.7	$	12.4	$	12,860.5	$	29.4		$	12,889.9

Information about Geographic Areas

As of March 31, 2013, the geographic distribution of our drilling rigs by operating segment was as follows:

	Floaters	Jackups	Total(1)
North & South America (excluding Brazil)	8	14	22
Brazil	10	—	10
Europe & Mediterranean	1	8	9
Middle East & Africa	4	9	13
Asia & Pacific Rim	2	11	13
Asia & Pacific Rim (under construction)	3	3	6
Total	28	45	73

⁽¹⁾   We provide management services on three rigs owned by third-parties not included in the table above.

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Discontinued Operations

3 Months Ended

Mar. 31, 2013

Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operations

Discontinued Operations

During the three-month period ended March 31, 2013, we sold jackup rig Pride Pennsylvania for net proceeds of $15.5 million. The proceeds were included in investing activities of discontinued operations in our condensed consolidated statement of cash flows for the three-month period ended March 31, 2013. We recognized a loss of $1.1 million in connection with the disposal, which was included in loss on disposal of discontinued operations, net in our condensed consolidated statement of income for the three-month period ended March 31, 2013. During the third quarter of 2012, we classified Pride Pennsylvania as held for sale and the rig was written down to fair value less estimated cost to sell.

Pride Pennsylvania operating results were reclassified to discontinued operations in our condensed consolidated statement of income for the three-month period ended March 31, 2012.

During 2012, we sold three jackup rigs (ENSCO 59, ENSCO 61 and Pride Hawaii), one moored semisubmersible rig (ENSCO 5003) and our last remaining barge rig (ENSCO I). The rigs' operating results were reclassified to discontinued operations in our condensed consolidated statement of income for the three-month period ended March 31, 2012.

The following table summarizes loss from discontinued operations for the three-month periods ended March 31, 2013 and 2012 (in millions):

	2013			2012
Revenues	$	—		$	5.8
Operating expenses	.1			21.4
Operating loss before income taxes	(.1		)	(15.6		)
Other income	.3			.5
Income tax benefit	—			2.0
Loss on disposal of discontinued operations, net	(1.1		)	—
Loss from discontinued operations	$	(.9	)	$	(13.1	)

Debt and interest expense are not allocated to our discontinued operations.

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Contingencies

3 Months Ended

Mar. 31, 2013

Commitments and Contingencies Disclosure [Abstract]

Contingencies

Contingencies

ENSCO 74 Loss

During 2008, our jackup rig 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.

In April 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 paid $14.0 million to the customer through March 31, 2013 and received $13.1 million in insurance reimbursements. Our condensed consolidated balance sheet as of March 31, 2013 included a $5.0 million liability for remaining installments due to the customer in accrued liabilities and other and a $5.9 million 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 claims remain. 

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. These matters are currently scheduled for trial in September 2013. Based on information currently available, primarily the adequacy of available defenses, we have not concluded that it is probable liabilities exist with respect to these matters.

The owner of a second 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. The matter currently is scheduled for trial in September 2013. Based on information currently available, primarily the adequacy of available defenses, we have concluded that it is remote that a liability exists with respect to this matter.

We have liability insurance policies that provide coverage for claims such as the tanker and pipeline 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 self-insured retention for third-party claims and an annual aggregate limit of $500.0 million. 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 self-insured retention 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.

We intend to vigorously defend against these 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 the 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.

    Environmental Matters

We currently are subject to pending notices of assessment issued from 2008 to 2013 pursuant to which governmental authorities in Brazil are seeking fines in an aggregate amount of approximately $2.4 million for the release of drilling fluid from drilling rigs operating offshore Brazil. We are contesting these notices and intend to vigorously defend ourselves.  Although we do not expect the outcome of these assessments to have a material adverse effect on our financial position, operating results or cash flows, there can be no assurance as to the ultimate outcome of these assessments. A $2.4 million liability related to these matters was recorded as of March 31, 2013 and included in accrued liabilities and other on our condensed consolidated balance sheet.

We currently are subject to a pending administrative proceeding initiated during 2009 by a Spanish government authority seeking payment in an aggregate amount of approximately $4.0 million for an alleged environmental spill originating from ENSCO 5006 while it was operating offshore Spain. Our customer has posted guarantees with the Spanish government to cover potential penalties. Additionally, we expect to be indemnified for any payments resulting from this incident by our customer under the terms of the drilling contract. A criminal investigation of the incident was initiated during 2010 by a prosecutor in Tarragona, Spain, and the administrative proceedings have been suspended pending the outcome of this investigation.  We do not know at this time what, if any, involvement we may have in this investigation.

We intend to vigorously defend ourselves in the administrative proceeding and any criminal investigation. At this time, we are unable to predict the outcome of these matters or estimate the extent to which we may be exposed to any resulting liability. Although we do not expect the outcome of the proceedings to have a material adverse effect on our financial position, operating results or cash flows, there can be no assurance as to the ultimate outcome of the proceedings.

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.

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Supplemental Financial Information

3 Months Ended

Mar. 31, 2013

Supplemental Financial Information [Abstract]

Supplemental Financial Information

Supplemental Financial Information

Consolidated Balance Sheet Information

Accounts receivable, net, consisted of the following (in millions):

	March 31, 2013			December 31, 2012
Trade	$	814.8		$	812.4
Other	12.2			18.2
	827.0			830.6
Allowance for doubtful accounts	(17.9		)	(19.2		)
	$	809.1		$	811.4

Other current assets consisted of the following (in millions):

	March 31, 2013		December 31, 2012
Inventory	$	215.9	$	207.8
Prepaid taxes	60.9		62.2
Short-term investments	50.0		50.0
Deferred mobilization costs	29.6		33.7
Deferred tax assets	21.2		14.6
Prepaid expenses	14.5		20.3
Assets held for sale	—		14.2
Other	21.9		22.6
	$	414.0	$	425.4

Other assets, net, consisted of the following (in millions):

	March 31, 2013		December 31, 2012
Intangible assets	$	115.0	$	143.3
Unbilled receivables	74.9		77.1
Prepaid taxes on intercompany transfers of property	56.8		58.3
Supplemental executive retirement plan assets	35.2		29.8
Warranty and other claim receivables	30.6		30.6
Deferred tax assets	19.0		19.3
Deferred mobilization costs	12.2		20.8
Wreckage and debris removal receivables	5.9		13.2
Other	28.8		29.4
	$	378.4	$	421.8

Accrued liabilities and other consisted of the following (in millions):

	March 31, 2013		December 31, 2012
Personnel costs	$	165.6	$	231.1
Deferred revenue	142.3		146.2
Taxes	93.9		86.9
Interest	36.0		67.9
Wreckage and debris removal	5.0		9.0
Other	46.2		43.3
	$	489.0	$	584.4

Other liabilities consisted of the following (in millions):

	March 31, 2013		December 31, 2012
Deferred revenue	$	215.7	$	224.5
Unrecognized tax benefits (inclusive of interest and penalties)	132.4		129.6
Intangible liabilities	101.9		118.0
Supplemental executive retirement plan liabilities	38.4		33.3
Personnel costs	28.4		31.6
Other	31.6		36.4
	$	548.4	$	573.4

Accumulated other comprehensive income consisted of the following (in millions):

	March 31, 2013			December 31, 2012
Derivative Instruments	$	19.4		$	24.4
Other	(4.4		)	(4.3		)
	$	15.0		$	20.1

Concentration 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 to date 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 generally 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. The terms of the ISDA agreements may also include credit support requirements, cross default provisions, termination events, or set-off provisions, in addition to a master netting agreement.  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 three-month period ended March 31, 2013, one customer in our Floaters segment provided an aggregate $200.1 million, or 17%, of our consolidated revenues.

Revenues provided by our drilling operations in the U.S. Gulf of Mexico during the three-month period ended March 31, 2013 totaled $401.5 million, or 35%, of our consolidated revenues, of which 75% were provided by our Floaters segment. Revenues provided by our drilling operations in Brazil during the three-month period ended March 31, 2013 totaled $243.3 million, or 21%, of our consolidated revenues, all of which were provided by our Floaters segment.

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Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Tax Disclosure [Abstract]
Consolidated effective income tax rate including tax expense attributable to prior periods	13.90%
Unrecognized tax benefits associated with a tax position taken in prior years	$ 4.9
Effective Income Tax Rate, Continuing Operations, Excluding Discrete Items	12.20%	12.20%

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Guarantee Of Registered Securities (Condensed Consolidating Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Guarantor Obligations [Line Items]
Cash and cash equivalents	$ 561.8	$ 487.1	$ 208.9	$ 430.7
Accounts receivable	809.1	811.4
Accounts receivable from affiliates	0	0
Other	414.0	425.4
Total current assets	1,784.9	1,723.9
PROPERTY AND EQUIPMENT, AT COST	15,893.6	15,737.1
Less accumulated depreciation	2,738.4	2,591.5
Property and equipment, net	13,155.2	13,145.6	12,889.9
GOODWILL	3,274.0	3,274.0
DUE FROM AFFILIATES	0	0
INVESTMENTS IN AFFILIATES	0	0
OTHER ASSETS, NET	378.4	421.8
TOTAL ASSETS	18,592.5	18,565.3
Accounts payable and accrued liabilities	797.9	942.2
Accounts payable to affiliates	0	0
Current maturities of long-term debt	47.5	47.5
Total current liabilities	845.4	989.7
DUE TO AFFILIATES	0	0
LONG-TERM DEBT	4,783.3	4,798.4
DEFERRED INCOME TAXES	346.8	351.7
OTHER LIABILITIES	548.4	573.4
ENSCO SHAREHOLDERS' EQUITY	12,062.1	11,846.4
NONCONTROLLING INTERESTS	6.5	5.7
Total equity	12,068.6	11,852.1
Total liabilities and shareholders' equity	18,592.5	18,565.3
Ensco Plc [Member]
Guarantor Obligations [Line Items]
Cash and cash equivalents	289.1	271.8	12.2	236.6
Accounts receivable	0	0
Accounts receivable from affiliates	1,296.2	1,294.5
Other	2.9	2.8
Total current assets	1,588.2	1,569.1
PROPERTY AND EQUIPMENT, AT COST	2.1	2.1
Less accumulated depreciation	1.2	1.1
Property and equipment, net	0.9	1.0
GOODWILL	0	0
DUE FROM AFFILIATES	2,677.0	3,483.5
INVESTMENTS IN AFFILIATES	13,831.0	13,469.3
OTHER ASSETS, NET	10.7	11.3
TOTAL ASSETS	18,107.8	18,534.2
Accounts payable and accrued liabilities	4.9	31.0
Accounts payable to affiliates	1,653.7	2,364.8
Current maturities of long-term debt	0	0
Total current liabilities	1,658.6	2,395.8
DUE TO AFFILIATES	1,910.0	1,816.7
LONG-TERM DEBT	2,470.6	2,469.6
DEFERRED INCOME TAXES	0	0
OTHER LIABILITIES	0	0
ENSCO SHAREHOLDERS' EQUITY	12,068.6	11,852.1
NONCONTROLLING INTERESTS	0	0
Total equity	12,068.6	11,852.1
Total liabilities and shareholders' equity	18,107.8	18,534.2
ENSCO International Inc. [Member]
Guarantor Obligations [Line Items]
Cash and cash equivalents	0	1.7	13.5	0
Accounts receivable	0.3	0.2
Accounts receivable from affiliates	166.4	226.5
Other	24.8	24.9
Total current assets	191.5	253.3
PROPERTY AND EQUIPMENT, AT COST	30.1	30.2
Less accumulated depreciation	23.6	23.5
Property and equipment, net	6.5	6.7
GOODWILL	0	0
DUE FROM AFFILIATES	3,758.5	3,594.7
INVESTMENTS IN AFFILIATES	2,799.8	2,693.8
OTHER ASSETS, NET	64.8	67.4
TOTAL ASSETS	6,821.1	6,615.9
Accounts payable and accrued liabilities	47.5	28.1
Accounts payable to affiliates	56.5	136.9
Current maturities of long-term debt	0	0
Total current liabilities	104.0	165.0
DUE TO AFFILIATES	2,260.6	2,054.7
LONG-TERM DEBT	149.1	149.0
DEFERRED INCOME TAXES	325.2	335.1
OTHER LIABILITIES	1.0	0
ENSCO SHAREHOLDERS' EQUITY	3,981.2	3,912.1
NONCONTROLLING INTERESTS	0	0
Total equity	3,981.2	3,912.1
Total liabilities and shareholders' equity	6,821.1	6,615.9
Pride International, Inc. [Member]
Guarantor Obligations [Line Items]
Cash and cash equivalents	115.0	85.0	29.3	22.6
Accounts receivable	0	0
Accounts receivable from affiliates	1.4	0
Other	0	0
Total current assets	116.4	85.0
PROPERTY AND EQUIPMENT, AT COST	0	0
Less accumulated depreciation	0	0
Property and equipment, net	0	0
GOODWILL	0	0
DUE FROM AFFILIATES	1,640.4	1,628.4
INVESTMENTS IN AFFILIATES	3,836.2	3,824.8
OTHER ASSETS, NET	0	0
TOTAL ASSETS	5,593.0	5,538.2
Accounts payable and accrued liabilities	23.4	34.1
Accounts payable to affiliates	0	0
Current maturities of long-term debt	0	0
Total current liabilities	23.4	34.1
DUE TO AFFILIATES	954.6	877.5
LONG-TERM DEBT	2,032.7	2,040.8
DEFERRED INCOME TAXES	0	0
OTHER LIABILITIES	10.5	10.8
ENSCO SHAREHOLDERS' EQUITY	2,571.8	2,575.0
NONCONTROLLING INTERESTS	0	0
Total equity	2,571.8	2,575.0
Total liabilities and shareholders' equity	5,593.0	5,538.2
Other Non-Guarantor Subsidiaries Of Ensco [Member]
Guarantor Obligations [Line Items]
Cash and cash equivalents	157.7	128.6	153.9	171.5
Accounts receivable	808.8	811.2
Accounts receivable from affiliates	1,577.1	2,375.1
Other	386.3	397.7
Total current assets	2,929.9	3,712.6
PROPERTY AND EQUIPMENT, AT COST	15,861.4	15,704.8
Less accumulated depreciation	2,713.6	2,566.9
Property and equipment, net	13,147.8	13,137.9
GOODWILL	3,274.0	3,274.0
DUE FROM AFFILIATES	5,125.2	4,748.9
INVESTMENTS IN AFFILIATES	0	0
OTHER ASSETS, NET	302.9	343.1
TOTAL ASSETS	24,779.8	25,216.5
Accounts payable and accrued liabilities	722.1	849.0
Accounts payable to affiliates	1,330.9	1,394.4
Current maturities of long-term debt	47.5	47.5
Total current liabilities	2,100.5	2,290.9
DUE TO AFFILIATES	8,075.9	8,706.6
LONG-TERM DEBT	130.9	139.0
DEFERRED INCOME TAXES	21.6	16.6
OTHER LIABILITIES	536.9	562.6
ENSCO SHAREHOLDERS' EQUITY	13,907.5	13,495.1
NONCONTROLLING INTERESTS	6.5	5.7
Total equity	13,914.0	13,500.8
Total liabilities and shareholders' equity	24,779.8	25,216.5
Consolidating Adjustments [Member]
Guarantor Obligations [Line Items]
Cash and cash equivalents	0	0	0	0
Accounts receivable	0	0
Accounts receivable from affiliates	(3,041.1)	(3,896.1)
Other	0	0
Total current assets	(3,041.1)	(3,896.1)
PROPERTY AND EQUIPMENT, AT COST	0	0
Less accumulated depreciation	0	0
Property and equipment, net	0	0
GOODWILL	0	0
DUE FROM AFFILIATES	(13,201.1)	(13,455.5)
INVESTMENTS IN AFFILIATES	(20,467.0)	(19,987.9)
OTHER ASSETS, NET	0	0
TOTAL ASSETS	(36,709.2)	(37,339.5)
Accounts payable and accrued liabilities	0	0
Accounts payable to affiliates	(3,041.1)	(3,896.1)
Current maturities of long-term debt	0	0
Total current liabilities	(3,041.1)	(3,896.1)
DUE TO AFFILIATES	(13,201.1)	(13,455.5)
LONG-TERM DEBT	0	0
DEFERRED INCOME TAXES	0	0
OTHER LIABILITIES	0	0
ENSCO SHAREHOLDERS' EQUITY	(20,467.0)	(19,987.9)
NONCONTROLLING INTERESTS	0	0
Total equity	(20,467.0)	(19,987.9)
Total liabilities and shareholders' equity	$ (36,709.2)	$ (37,339.5)

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Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

Reconciliation Of Net Income Attributable To Ensco Shares

The following table is a reconciliation of net income attributable to Ensco shares used in our basic and diluted EPS computations for the three-month periods ended March 31, 2013 and 2012 (in millions):

	2013			2012
Net income attributable to Ensco	$	317.1		$	265.4
Net income allocated to non-vested share awards	(3.3		)	(2.7		)
Net income attributable to Ensco shares	$	313.8		$	262.7

Reconciliation Of Weighted-Average Shares Used In Earnings Per Share Computations

The following table is a reconciliation of the weighted-average shares outstanding used in our basic and diluted EPS computations for the three-month periods ended March 31, 2013 and 2012 (in millions):

	2013	2012
Weighted-average shares - basic	230.3	228.8
Potentially dilutive shares	.3	.4
Weighted-average shares - diluted	230.6	229.2

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Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Supplemental executive retirement plan assets	$ 35.2	$ 29.8
Derivatives, net		5.2
Total financial assets	35.2	35.0
Derivatives, net	(3.3)
Total financial liabilities	(3.3)
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	35.2	29.8
Derivatives, net		0
Total financial assets	35.2	29.8
Derivatives, net	0
Total financial liabilities	0
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		5.2
Total financial assets	0	5.2
Derivatives, net	(3.3)
Total financial liabilities	(3.3)
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
Total financial assets	0	0
Derivatives, net	0
Total financial liabilities	$ 0

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Guarantee Of Registered Securities (Condensed Consolidating Statements Of Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Guarantor Obligations [Line Items]
OPERATING REVENUES	$ 1,149.9	$ 1,020.6
Contract drilling (exclusive of depreciation)	560.8	502.2
Depreciation	149.0	136.0
General and administrative	37.8	38.2
OPERATING INCOME	402.3	344.2
OTHER INCOME (EXPENSE), NET	(29.8)	(26.7)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	372.5	317.5
INCOME TAX PROVISION	51.7	37.0
DISCONTINUED OPERATIONS, NET	(0.9)	(13.1)
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	0	0
NET INCOME	319.9	267.4
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(2.8)	(2.0)
NET INCOME ATTRIBUTABLE TO ENSCO	317.1	265.4
Ensco Plc [Member]
Guarantor Obligations [Line Items]
OPERATING REVENUES	5.5	21.9
Contract drilling (exclusive of depreciation)	12.4	6.9
Depreciation	0.1	0.1
General and administrative	16.9	14.6
OPERATING INCOME	(23.9)	0.3
OTHER INCOME (EXPENSE), NET	(14.6)	(11.2)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(38.5)	(10.9)
INCOME TAX PROVISION	0	0
DISCONTINUED OPERATIONS, NET	0	0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	355.6	276.3
NET INCOME	317.1	265.4
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0	0
NET INCOME ATTRIBUTABLE TO ENSCO	317.1	265.4
ENSCO International Inc. [Member]
Guarantor Obligations [Line Items]
OPERATING REVENUES	38.1	10.6
Contract drilling (exclusive of depreciation)	38.1	10.6
Depreciation	0.8	0.8
General and administrative	0.2	0
OPERATING INCOME	(1.0)	(0.8)
OTHER INCOME (EXPENSE), NET	(7.4)	(0.3)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(8.4)	(1.1)
INCOME TAX PROVISION	29.5	11.2
DISCONTINUED OPERATIONS, NET	0	0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	111.7	44.2
NET INCOME	73.8	31.9
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0	0
NET INCOME ATTRIBUTABLE TO ENSCO	73.8	31.9
Pride International, Inc. [Member]
Guarantor Obligations [Line Items]
OPERATING REVENUES	0	0
Contract drilling (exclusive of depreciation)	0	0
Depreciation	0	0
General and administrative	0	0
OPERATING INCOME	0	0
OTHER INCOME (EXPENSE), NET	(14.6)	(11.7)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(14.6)	(11.7)
INCOME TAX PROVISION	0	0
DISCONTINUED OPERATIONS, NET	0	0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	52.4	79.7
NET INCOME	37.8	68.0
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0	0
NET INCOME ATTRIBUTABLE TO ENSCO	37.8	68.0
Other Non-Guarantor Subsidiaries Of Ensco [Member]
Guarantor Obligations [Line Items]
OPERATING REVENUES	1,183.7	1,037.0
Contract drilling (exclusive of depreciation)	587.7	533.6
Depreciation	148.1	135.1
General and administrative	20.7	23.6
OPERATING INCOME	427.2	344.7
OTHER INCOME (EXPENSE), NET	6.8	(3.5)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	434.0	341.2
INCOME TAX PROVISION	22.2	25.8
DISCONTINUED OPERATIONS, NET	(0.9)	(13.1)
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	0	0
NET INCOME	410.9	302.3
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(2.8)	(2.0)
NET INCOME ATTRIBUTABLE TO ENSCO	408.1	300.3
Consolidating Adjustments [Member]
Guarantor Obligations [Line Items]
OPERATING REVENUES	(77.4)	(48.9)
Contract drilling (exclusive of depreciation)	(77.4)	(48.9)
Depreciation	0	0
General and administrative	0	0
OPERATING INCOME	0	0
OTHER INCOME (EXPENSE), NET	0	0
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	0	0
INCOME TAX PROVISION	0	0
DISCONTINUED OPERATIONS, NET	0	0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	(519.7)	(400.2)
NET INCOME	(519.7)	(400.2)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0	0
NET INCOME ATTRIBUTABLE TO ENSCO	$ (519.7)	$ (400.2)

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Supplemental Financial Information Supplemental Financial Information (Narrative) (Details) (Sales Revenue, Services, Net [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Floaters [Member] | Product Concentration Risk [Member]
Revenues	$ 200.1
Concentration Risk, Percentage	17.00%
US Gulf Of Mexico [Member] | Geographic Concentration Risk [Member]
Revenues	401.5
Concentration Risk, Percentage	35.00%
US Gulf Of Mexico [Member] | Floaters [Member] | Geographic Concentration Risk [Member]
Concentration Risk, Percentage	75.00%
Brazil [Member] | Geographic Concentration Risk [Member]
Revenues	$ 243.3
Concentration Risk, Percentage	21.00%

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Condensed Consolidated Balance Sheets (Parenthetical)	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Class A ordinary shares, U.S. [Member] USD ($)	Dec. 31, 2012 Class A ordinary shares, U.S. [Member] USD ($)	Mar. 31, 2013 Common Class B, Par Value In GBP [Member] GBP (£)	Dec. 31, 2012 Common Class B, Par Value In GBP [Member] GBP (£)
Common stock, par value per share (in dollars per share or pounds sterling per share)			$ 0.10	$ 0.10	£ 1	£ 1
Common shares, shares authorized (in shares)			450,000,000	450,000,000	50,000	50,000
Common shares, shares issued (in shares)			237,800,000	237,700,000	50,000	50,000
Treasury shares, shares held (in shares)	5,000,000	5,300,000

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Noncontrolling Interests

3 Months Ended

Mar. 31, 2013

Noncontrolling Interest [Abstract]

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 condensed consolidated balance sheets, and net income attributable to noncontrolling interests is presented separately on our condensed consolidated statements of income.

Income from continuing operations attributable to Ensco for the three-month periods ended March 31, 2013 and 2012 was as follows (in millions):

	2013			2012
Income from continuing operations	$	320.8		$	280.5
Income from continuing operations attributable to noncontrolling interests	(2.8		)	(2.0		)
Income from continuing operations attributable to Ensco	$	318.0		$	278.5

Loss from discontinued operations, net, for the three-month periods ended March 31, 2013 and 2012 was attributable to Ensco.

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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Carrying Value	$ 4,830.8	$ 4,845.9
Estimated Fair Value	5,341.0	5,397.7
4.70% Senior notes due 2021 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Carrying Value	1,475.3	1,474.7
Estimated Fair Value	1,679.6	1,715.6
Debt instrument, interest rate, stated percentage	4.70%	4.70%
6.875% Senior notes due 2020 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Carrying Value	1,036.9	1,040.6
Estimated Fair Value	1,123.5	1,138.3
Debt instrument, interest rate, stated percentage	6.875%	6.875%
3.25% Senior notes due 2016 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Carrying Value	995.3	995.1
Estimated Fair Value	1,066.1	1,068.9
Debt instrument, interest rate, stated percentage	3.25%	3.25%
8.50% Senior notes due 2019 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Carrying Value	612.5	616.4
Estimated Fair Value	661.9	661.7
Debt instrument, interest rate, stated percentage	8.50%	8.50%
7.875% Senior notes due 2040 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Carrying Value	383.5	383.8
Estimated Fair Value	433.3	423.9
Debt instrument, interest rate, stated percentage	7.875%	7.875%
7.20% Debentures due 2027 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Carrying Value	149.0	149.0
Estimated Fair Value	189.3	193.2
Debt instrument, interest rate, stated percentage	7.20%	7.20%
4.33% MARAD bonds, including current maturities, due 2016 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Carrying Value	104.3	112.3
Estimated Fair Value	105.0	113.0
Debt instrument, interest rate, stated percentage	4.33%	4.33%
6.36% MARAD bonds, including current maturities, due 2015 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Carrying Value	38.0	38.0
Estimated Fair Value	41.2	41.7
Debt instrument, interest rate, stated percentage	6.36%	6.36%
4.65% MARAD bonds, including current maturities, due 2020 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Carrying Value	36.0	36.0
Estimated Fair Value	$ 41.1	$ 41.4
Debt instrument, interest rate, stated percentage	4.65%	4.65%

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Segment Information (Narrative) (Details)	3 Months Ended
	Mar. 31, 2013 contract segments
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Number of operating segments (in segments)	3
Number of reportable segments (in segments)	2
Number of drilling management contracts (in contracts)	3

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Noncontrolling Interests (Tables)

3 Months Ended

Mar. 31, 2013

Noncontrolling Interest [Abstract]

Income from Continuing Operations Attributable to Ensco

Income from continuing operations attributable to Ensco for the three-month periods ended March 31, 2013 and 2012 was as follows (in millions):

	2013			2012
Income from continuing operations	$	320.8		$	280.5
Income from continuing operations attributable to noncontrolling interests	(2.8		)	(2.0		)
Income from continuing operations attributable to Ensco	$	318.0		$	278.5