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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 ($) shares in Thousands, $ in Millions	4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2020
Accounting Policies [Abstract]
NET LOSS ATTRIBUTABLE TO VALARIS	$ (4,467.0)	$ (27.4)	$ 176.5	$ (4,855.5)
Basic	199,600	75,000	75,100	198,900
Effect of stock equivalents	0	0	500	0
Diluted	199,600	75,000	75,600	198,900

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