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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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Income (loss) from continuing operations attributable to Ensco	$ 86.0	$ 315.4	$ 853.0	$ 910.7
Other Preferred Stock Dividends and Adjustments	1.8	4.8	15.1	12.2
Income (Loss) from Continuing Operations Attributable to Parent, Available to Common Stockholders	$ 84.2	$ 310.6	$ 837.9	$ 898.5

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

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Amount after tax of income (loss) from continuing operations attributable to the parent.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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Amount of preferred stock dividends and adjustments classified as other.

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