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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, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
NET LOSS ATTRIBUTABLE TO VALARIS	$ (4,467.0)	$ (27.4)	$ 865.4	$ 176.5
Basic	199,600	75,000	74,100	75,100
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements	0	0	1,100	500
Diluted	199,600	75,000	75,200	75,600	199,600

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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