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Description Of The Business And Summary Of Significant Accounting Policies (Schedule Of Income From Continuing Operations Attributable To Ensco) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Income (loss) from continuing operations attributable to Ensco	$ (198.0)	$ (631.6)	$ (304.7)
Income from continuing operations allocated to non-vested share awards	(0.1)	(0.5)	(0.4)
Income (loss) from continuing operations attributable to Ensco shares	$ (198.1)	$ (632.1)	$ (305.1)

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

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Amount of earnings (loss) distributed and earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.

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

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