Unaudited Quarterly Financial Data (Summary Of Unaudited Quarterly Consolidated Income Statement) (Details) - USD ($) $ / shares in Units, $ in Millions |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2014 |
Sep. 30, 2014 |
Jun. 30, 2014 |
Mar. 31, 2014 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
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| Quarterly Financial Data [Abstract] | |||||||||||
| OPERATING REVENUES | $ 828.3 | $ 1,012.2 | $ 1,059.0 | $ 1,163.9 | $ 1,159.8 | $ 1,201.4 | $ 1,136.6 | $ 1,066.7 | $ 4,063.4 | $ 4,564.5 | $ 4,323.4 |
| Contract drilling (exclusive of depreciation) | 415.2 | 433.5 | 502.6 | 518.3 | 514.0 | 500.2 | 542.5 | 520.2 | 1,869.6 | 2,076.9 | 1,947.1 |
| Asset Impairment Charges | 2,744.0 | 2.4 | 0.0 | 0.0 | 3,515.2 | 0.0 | 703.5 | 0.0 | 2,746.4 | 4,218.7 | 0.0 |
| Depreciation | 149.7 | 145.2 | 140.5 | 137.1 | 139.4 | 135.2 | 132.2 | 131.1 | 572.5 | 537.9 | 496.2 |
| General and administrative | 30.2 | 28.4 | 29.7 | 30.1 | 28.3 | 29.3 | 36.2 | 38.1 | 118.4 | 131.9 | 146.8 |
| OPERATING INCOME | (2,510.8) | 402.7 | 386.2 | 478.4 | (3,037.1) | 536.7 | (277.8) | 377.3 | (1,243.5) | (2,400.9) | 1,733.3 |
| Other income (expense), net | (47.3) | (52.4) | (55.4) | (72.6) | (49.6) | (38.4) | (30.8) | (29.1) | (227.7) | (147.9) | (100.1) |
| INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | (2,558.1) | 350.3 | 330.8 | 405.8 | (3,086.7) | 498.3 | (308.6) | 348.2 | (1,471.2) | (2,548.8) | 1,633.2 |
| Provision for income taxes | (182.8) | 33.2 | 58.0 | 77.7 | (26.2) | 74.6 | 42.6 | 49.5 | (13.9) | 140.5 | 203.1 |
| Income from continuing operations | (2,375.3) | 317.1 | 272.8 | 328.1 | (3,060.5) | 423.7 | (351.2) | 298.7 | (1,457.3) | (2,689.3) | 1,430.1 |
| DISCONTINUED OPERATIONS, NET | (95.0) | (23.3) | (10.1) | (0.2) | (388.0) | 9.2 | (818.4) | (2.0) | (128.6) | (1,199.2) | (2.2) |
| NET INCOME | (2,470.3) | 293.8 | 262.7 | 327.9 | (3,448.5) | 432.9 | (1,169.6) | 296.7 | (1,585.9) | (3,888.5) | 1,427.9 |
| NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS | (1.5) | (1.8) | (2.4) | (3.2) | (3.3) | (3.5) | (3.1) | (4.2) | (8.9) | (14.1) | (9.7) |
| NET INCOME ATTRIBUTABLE TO ENSCO | $ (2,471.8) | $ 292.0 | $ 260.3 | $ 324.7 | $ (3,451.8) | $ 429.4 | $ (1,172.7) | $ 292.5 | $ (1,594.8) | $ (3,902.6) | $ 1,418.2 |
| EARNINGS PER SHARE - BASIC | |||||||||||
| Continuing operations | $ (10.23) | $ 1.34 | $ 1.15 | $ 1.38 | $ (13.22) | $ 1.79 | $ (1.53) | $ 1.26 | $ (6.33) | $ (11.70) | |
| Discontinued operations | (0.41) | (0.10) | (0.04) | 0.00 | (1.67) | 0.04 | (3.54) | (0.01) | (0.55) | (5.18) | |
| Total earnings per share - basic | $ (10.64) | $ 1.24 | $ 1.11 | $ 1.38 | $ (14.89) | $ 1.83 | $ (5.07) | $ 1.25 | (6.88) | (16.88) | |
| EARNINGS PER SHARE - DILUTED | |||||||||||
| Continuing operations | (6.33) | (11.70) | $ 6.08 | ||||||||
| Discontinued operations | (0.55) | (5.18) | (0.01) | ||||||||
| Total earnings per share - diluted | $ (6.88) | $ (16.88) | $ 6.07 | ||||||||
| X | ||||||||||
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The expense recognized in the current period that allocates the cost of a tangible asset used in providing revenue generating services over the asset's useful life. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Costs of generating revenue from oil and gas-related services including well services (such as drilling, rigs and analytic evaluations), transportation, and other supporting contractor services, during the reporting period. No definition available.
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- References No definition available.
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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. No definition available.
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The amount of net income (loss) from continuing operations per each basic and diluted share of common stock or unit when the per share amount is the same for both basic and diluted shares. No definition available.
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- Definition The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Per basic and diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation, when the per share amount is the same. No definition available.
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- Definition Per diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of Net Income (Loss) attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The net result for the period of deducting operating expenses from operating revenues. No definition available.
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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- Definition Revenue from oil and gas-related services including well services (such as drilling, rigs and analytic evaluations), transportation, and other supporting contractor services, during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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