Unaudited Condensed Consolidated Financial Statements	3 Months Ended
Mar. 31, 2011
Unaudited Condensed Consolidated Financial Statements [Abstract]
Unaudited Condensed Consolidated Financial Statements	Note 1 - Unaudited Condensed Consolidated Financial Statements Basis of Presentation We prepared the accompanying condensed consolidated financial statements of Ensco plc and subsidiaries (the "Company", "Ensco", "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, 2010 condensed consolidated balance sheet data were derived from our 2010 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 quarters ended March 31, 2011 and 2010 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 quarter ended March 31, 2011 are not necessarily indicative of the results of operations that will be realized for the year ending December 31, 2011. 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, 2010 included in our Annual Report on Form 10-K filed with the SEC on February 24, 2011. Pending Merger with Pride On February 6, 2011, Ensco plc entered into an Agreement and Plan of Merger with Pride International, Inc., a Delaware corporation ("Pride"), ENSCO International Incorporated, a Delaware corporation and a wholly-owned subsidiary and predecessor of Ensco, and ENSCO Ventures LLC, a Delaware limited liability company and an indirect, wholly-owned subsidiary of Ensco ("Merger Sub"). Pursuant to the merger agreement and subject to the conditions set forth therein, Merger Sub will merge with and into Pride, with Pride as the surviving entity and an indirect, wholly-owned subsidiary of Ensco. As a result of the merger, each outstanding share of Pride's common stock (other than shares of common stock held directly or indirectly by Ensco, Pride or any wholly-owned subsidiary of Ensco or Pride (which will be cancelled as a result of the merger), those shares with respect to which appraisal rights under Delaware law are properly exercised and not withdrawn and other shares held by certain U.K. residents if determined by Ensco) will be converted into the right to receive $15.60 in cash and 0.4778 Ensco American depositary shares, each representing one Class A ordinary share ("ADS" or "share"). Under certain circumstances, U.K. residents may receive all cash consideration as a result of compliance with legal requirements. We estimate that the total consideration to be delivered in the merger to be approximately $7.9 billion, consisting of $2.8 billion of cash, the delivery of approximately 86.0 million Ensco ADSs (assuming that no Pride employee stock options are exercised before the closing of the merger) with an aggregate value of $5.1 billion based on the closing price of Ensco ADSs of $59.10 on April 25, 2011 and the estimated fair value of $32.0 million of Pride employee stock options assumed by Ensco. The value of the merger consideration will fluctuate based upon changes in the price of Ensco ADSs and the number of shares of Pride common stock and employee stock options outstanding on the closing date. The merger agreement and the merger were approved by the respective Boards of Directors of Ensco and Pride. Consummation of the merger is subject to the approval of the shareholders of Ensco and the stockholders of Pride, regulatory approvals and the satisfaction or waiver of various other conditions as more fully described in the merger agreement. On March 30, 2011, Ensco and Pride received notice from the Antitrust Division of the U.S. Department of Justice and the Federal Trade Commission granting early termination of the waiting period under the Hart-Scott-Rodino Act. Subject to receipt of remaining required approvals, it is anticipated that the closing of the merger will occur during the second quarter of 2011.

Note 1 - Unaudited Condensed Consolidated Financial Statements

Basis of Presentation

We prepared the accompanying condensed consolidated financial statements of Ensco plc and subsidiaries (the "Company", "Ensco", "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, 2010 condensed consolidated balance sheet data were derived from our 2010 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 quarters ended March 31, 2011 and 2010 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 quarter ended March 31, 2011 are not necessarily indicative of the results of operations that will be realized for the year ending December 31, 2011. 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, 2010 included in our Annual Report on Form 10-K filed with the SEC on February 24, 2011.

Pending Merger with Pride

On February 6, 2011, Ensco plc entered into an Agreement and Plan of Merger with Pride International, Inc., a Delaware corporation ("Pride"), ENSCO International Incorporated, a Delaware corporation and a wholly-owned subsidiary and predecessor of Ensco, and ENSCO Ventures LLC, a Delaware limited liability company and an indirect, wholly-owned subsidiary of Ensco ("Merger Sub"). Pursuant to the merger agreement and subject to the conditions set forth therein, Merger Sub will merge with and into Pride, with Pride as the surviving entity and an indirect, wholly-owned subsidiary of Ensco. As a result of the merger, each outstanding share of Pride's common stock (other than shares of common stock held directly or indirectly by Ensco, Pride or any wholly-owned subsidiary of Ensco or Pride (which will be cancelled as a result of the merger), those shares with respect to which appraisal rights under Delaware law are properly exercised and not withdrawn and other shares held by certain U.K. residents if determined by Ensco) will be converted into the right to receive $15.60 in cash and 0.4778 Ensco American depositary shares, each representing one Class A ordinary share ("ADS" or "share"). Under certain circumstances, U.K. residents may receive all cash consideration as a result of compliance with legal requirements.

We estimate that the total consideration to be delivered in the merger to be approximately $7.9 billion, consisting of $2.8 billion of cash, the delivery of approximately 86.0 million Ensco ADSs (assuming that no Pride employee stock options are exercised before the closing of the merger) with an aggregate value of $5.1 billion based on the closing price of Ensco ADSs of $59.10 on April 25, 2011 and the estimated fair value of $32.0 million of Pride employee stock options assumed by Ensco. The value of the merger consideration will fluctuate based upon changes in the price of Ensco ADSs and the number of shares of Pride common stock and employee stock options outstanding on the closing date. The merger agreement and the merger were approved by the respective Boards of Directors of Ensco and Pride. Consummation of the merger is subject to the approval of the shareholders of Ensco and the stockholders of Pride, regulatory approvals and the satisfaction or waiver of various other conditions as more fully described in the merger agreement. On March 30, 2011, Ensco and Pride received notice from the Antitrust Division of the U.S. Department of Justice and the Federal Trade Commission granting early termination of the waiting period under the Hart-Scott-Rodino Act. Subject to receipt of remaining required approvals, it is anticipated that the closing of the merger will occur during the second quarter of 2011.