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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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
(Loss) income from continuing operations attributable to Ensco	$ (25.2)	$ 86.0	$ (96.2)	$ 853.0
Income from continuing operations allocated to non-vested share awards(1)	(0.1)	(1.8)	(0.3)	(15.1)
(Loss) income from continuing operations attributable to Ensco shares	$ (25.3)	$ 84.2	$ (96.5)	$ 837.9

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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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Amount of preferred stock dividends and adjustments classified as other.

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