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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Loss from continuing operations attributable to Ensco	$ (145.0)	$ (25.2)	$ (428.0)	$ (96.2)
Income from continuing operations allocated to non-vested share awards(1)	(0.2)	(0.1)	(0.4)	(0.3)
Loss from continuing operations attributable to Ensco shares	$ (145.2)	$ (25.3)	$ (428.4)	$ (96.5)

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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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