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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	4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Income (loss) from continuing operations attributable to Ensco	$ (4,467.0)	$ (33.0)	$ (4,855.5)	$ (198.0)
Income from continuing operations allocated to non-vested share awards	0.0	0.0	0.0	(0.1)
Income (loss) from continuing operations attributable to Ensco shares	$ (4,467.0)	$ (33.0)	$ (4,855.5)	$ (198.1)

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