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Description Of The Business And Summary Of Significant Accounting Policies (Schedule Of Income From Continuing Operations Attributable To Valaris) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Income (loss) from continuing operations attributable to Ensco	$ (4,855.5)	$ (198.0)	$ (631.6)
Income from continuing operations allocated to non-vested share awards	0.0	(0.1)	(0.5)
Income (loss) from continuing operations attributable to Ensco shares	$ (4,855.5)	$ (198.1)	$ (632.1)

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