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Acquisition Of Pride International, Inc. (Narrative) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  |
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Sep. 30, 2011 | Sep. 30, 2011 | Mar. 31, 2011 | Sep. 30, 2011 Minimum [Member] years | Sep. 30, 2011 Maximum [Member] years | Sep. 30, 2011 Common Stock [Member] | Sep. 30, 2011 ENSCO ADSs [Member] | Sep. 30, 2011 8.50% Senior Notes [Member] | Sep. 30, 2011 7.875% Senior Notes [Member] | Sep. 30, 2011 6.875% Senior Notes [Member] | Sep. 30, 2011 Maritime Administration Bond [Member] | May 31, 2011 Ensco Plc [Member] | Sep. 30, 2011 Pride International, Inc. [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition date |  | May 31, 2011 |  |  |  |  |  |  |  |  |  |  |
Bond Due Date |  |  |  |  |  |  |  |  |  |  | 2016 |  |
Business acquisition, revenues from merger date | $ 440,100,000 | $ 591,300,000 |  |  |  |  |  |  |  |  |  |  |
Business acquisition, net income from merger date | 62,600,000 | 86,900,000 |  |  |  |  |  |  |  |  |  |  |
Business acquisition, shareholders rights to receive in cash, per share |  |  |  |  |  |  |  |  |  |  |  |  | $ 15.60
Business acquisition, share holders rights to receive in ratio of share |  |  |  |  |  |  | 0.4778 |  |  |  |  |  |
Business acquisition, total consideration delivered | 7,415,900,000 | 7,415,900,000 |  |  |  |  |  |  |  |  |  |  |
Cash consideration paid |  |  |  |  |  | 2,803,000,000 |  |  |  |  |  |  |
Business acquisition, equity interest issued or issuable, number of shares |  |  |  |  |  |  | 85.8 |  |  |  |  |  |
Share consideration paid | 4,577,500,000 | 4,577,500,000 |  |  |  |  |  |  |  |  |  |  |
Closing price of Ensco ADSs |  |  |  |  |  |  | $ 53.32 |  |  |  |  | $ 53.32 |
Estimated fair value of 2.5 million vested Pride employee stock options assumed by Ensco | 35,400,000 | 35,400,000 |  |  |  |  |  |  |  |  |  |  |
Number of drillships under construction |  | two |  |  |  |  |  |  |  |  |  |  |
Equipment drillships |  | seven |  |  |  |  |  |  |  |  |  |  |
Equipment semisubmersible rigs |  | 12 |  |  |  |  |  |  |  |  |  |  |
Equipment jackup rigs |  | seven |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of pride's drilling rigs adjustments | 285,500,000 | 285,500,000 |  |  |  |  |  |  |  |  |  |  |
Remaining estimated useful life of drilling rigs (in years) |  |  |  | 10 | 35 |  |  |  |  |  |  |  |
Drilling rigs, estimated useful life, years, minimum |  | 30 |  |  |  |  |  |  |  |  |  |  |
Drilling rigs, estimated useful life, years, maximum |  | 35 |  |  |  |  |  |  |  |  |  |  |
Amortization expenses adjusted in intangible revenues |  | 27,100,000 |  |  |  |  |  |  |  |  |  |  |
Intangible assets included in other current assets and other assets | 186,200,000 | 186,200,000 |  |  |  |  |  |  |  |  |  |  |
Intangible liabilities included in other current liabilities and other liabilities | 226,100,000 | 226,100,000 |  |  |  |  |  |  |  |  |  |  |
Future amortization income (expense), year 2011 |  | 26,800,000 |  |  |  |  |  |  |  |  |  |  |
Future amortization income (expense), year 2012 |  | 26,000,000 |  |  |  |  |  |  |  |  |  |  |
Future amortization income (expense), year 2013 |  | 7,900,000 |  |  |  |  |  |  |  |  |  |  |
Future amortization income (expense), year 2014 |  | (4,800,000) |  |  |  |  |  |  |  |  |  |  |
Future amortization income (expense), year 2015 |  | (15,600,000) |  |  |  |  |  |  |  |  |  |  |
Future amortization income (expense), Thereafter |  | (400,000) |  |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  | 8.50% | 7.875% | 6.875% |  |  |
Principal amount of outstanding debt |  |  |  |  |  |  |  | 500,000,000 | 300,000,000 | 900,000,000 | 151,500,000 |  |
Aggregate intangible assets |  |  | 209,000,000 |  |  |  |  |  |  |  |  |  |
Aggregate intangible liabilities |  |  | 276,000,000 |  |  |  |  |  |  |  |  |  |
Senior notes due dates |  |  |  |  |  |  |  | 2019 | 2040 | 2020 |  |  |
Intangible liability of an unfavorable drillship construction contract |  | 36,000,000 |  |  |  |  |  |  |  |  |  |  |
Business combination debt assumed fair value adjustment |  |  |  |  |  |  |  |  |  |  | 406,200,000 |  |
Unsecured revolving credit facility total |  |  |  |  |  |  |  |  |  |  | 181,000,000 |  |
Payments for Merger-related costs | 23,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  | 27,200,000 |  |  |  |  |  |  |  |  |  |  |
ADS issuance costs |  |  |  |  |  |  | 70,500,000 |  |  |  |  |  |
Recognized net deferred tax liability |  | $ 24,200,000 |  |  |  |  |  |  |  |  |  |  |

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- Definition The fair value of line of credit assumed in noncash investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition The amount of cash paid during the reporting period for charges associated with the mergers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585 + Details
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- Definition The dollar amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section H + Details
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