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Description Of The Business And Summary Of Significant Accounting Policies (Schedule Of Income From Continuing Operations Attributable To Ensco) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Description Of The Business And Summary Of Significant Accounting Policies [Abstract]
Income from continuing operations	$ (3,060.5)	$ 423.7	$ (351.2)	$ 298.7	$ 401.4	$ 389.5	$ 336.6	$ 302.6	$ (2,689.3)	$ 1,430.1	$ 1,076.1
Income (Loss) from Continuing Operations, Portion Attributable to Noncontrolling Interest									(13.8)	(8.5)	(6.5)
Income from continuing operations attributable to Ensco									$ (2,703.1)	$ 1,421.6	$ 1,069.6

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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