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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Income (loss) from continuing operations attributable to Ensco	$ (631.6)	$ (304.7)	$ 882.1
Income from continuing operations allocated to non-vested share awards	(0.5)	(0.4)	(16.6)
Income (loss) from continuing operations attributable to Ensco shares	$ (632.1)	$ (305.1)	$ 865.5

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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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