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Cover Page - shares
 9 Months Ended
Sep. 30, 2021
Oct. 28, 2021
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2021  
Document Transition Report false  
Entity File Number 1-8097  
Entity Registrant Name Valaris Limited  
Entity Incorporation, State or Country Code D0  
Entity Tax Identification Number 98-1589854  
Entity Address, Address Line One Clarendon House, 2 Church Street  
Entity Address, City or Town Hamilton  
Entity Address, State or Province BM  
Entity Address, Postal Zip Code HM 11  
City Area Code 44 (0) 20  
Local Phone Number 7659 4660  
Amendment Flag false  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q3  
Entity Central Index Key 0000314808  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Shares, Shares Outstanding   75,000,045
Predecessor Class A ordinary shares    
Document Information [Line Items]    
Title of 12(b) Security Common Shares, $0.01 par value share  
Trading Symbol VAL  
Security Exchange Name NYSE  
Warrant    
Document Information [Line Items]    
Title of 12(b) Security Warrants to purchase Common Shares  
Trading Symbol VAL WS  
Security Exchange Name NYSE