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Earnings Per Share (Reconciliation Of Net Income Attributable To Ensco Shares) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
(Loss) income from continuing operations attributable to Ensco	$ (45.9)	$ 590.8	$ (71.0)	$ 767.0
Income from continuing operations allocated to non-vested share awards(1)	(0.1)	(9.8)	(0.2)	(12.0)
(Loss) income from continuing operations attributable to Ensco shares	$ (46.0)	$ 581.0	$ (71.2)	$ 755.0

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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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