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Earnings Per Share | 9 Months Ended
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Sep. 30, 2011
Earnings Per Share [Abstract] |
Earnings Per Share | Note 9 - 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 includes the dilutive effect of share options 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 and nine-month periods ended September 30, 2011 and 2010 (in millions):
| Three Months Ended September 30, | Nine Months Ended September 30,
| 2011 | 2010 | 2011 | 2010
Net income attributable to Ensco |  | $204.5 |  | $130.5 |  | $371.0 |  | $446.6 |
Net income allocated to non-vested share awards |  | (2.3 | ) | (1.8 | ) | (4.3 | ) | (5.7 | )
Net income attributable to Ensco shares |  | $202.2 |  | $128.7 |  | $366.7 |  | $440.9 |
The following table is a reconciliation of the weighted-average shares used in our basic and diluted EPS computations for the three-month and nine-month periods ended September 30, 2011 and 2010 (in millions):
| Three Months Ended September 30, | Nine Months Ended September 30,
| 2011 | 2010 | 2011 | 2010
Weighted-average shares - basic |  | 228.1 |  | 141.1 |  | 180.0 |  | 140.9 |
Potentially dilutive share options |  | .5 |  | .1 |  | .4 |  | .1 |
Weighted-average shares - diluted |  | 228.6 |  | 141.2 |  | 180.4 |  | 141.0 |
Antidilutive share options totaling 800,000 and 1.1 million were excluded from the computation of diluted EPS for the three-month periods ended September 30, 2011 and 2010, respectively. Antidilutive share options totaling 400,000 and 1.1 million were excluded from the computation of diluted EPS for the nine-month periods ended September 30, 2011 and 2010, respectively.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=6945512&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1278-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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