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Description Of The Business And Summary Of Significant Accounting Policies (Schedule Of Income From Discontinued 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]
(Loss) income from discontinued operations	$ (388.0)	$ 9.2	$ (818.4)	$ (2.0)	$ (37.4)	$ (8.1)	$ 26.0	$ 17.3	$ (1,199.2)	$ (2.2)	$ 100.6
Income from discontinued operations attributable to noncontrolling interests									(0.3)	(1.2)	(0.5)
(Loss) income from discontinued operations attributable to Ensco									$ (1,199.5)	$ (3.4)	$ 100.1

Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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