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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
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accounting Policies [Abstract]      
NET LOSS ATTRIBUTABLE TO VALARIS $ 373.4 $ 865.4 $ 176.5
Basic 72,100 74,100 75,100
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements 800 1,100 500
Diluted 72,900 75,200 75,600