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Earnings Per Share (Reconciliation Of Net Income Attributable To Ensco Shares) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Income (loss) from continuing operations attributable to Ensco	$ 315.4	$ 420.3	$ 910.7	$ 360.7
Other Preferred Stock Dividends and Adjustments	4.8	4.8	12.2	5.9
Income (Loss) from Continuing Operations Attributable to Parent, Available to Common Stockholders	$ 310.6	$ 415.5	$ 898.5	$ 354.8

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Income (Loss) from Continuing Operations Attributable to Parent, Available to Common Stockholders

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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Other preferred stock dividends and adjustments, not otherwise defined in the taxonomy, that are necessary to adjust net income to obtain net income applicable to common stockholders.

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