XML 13 R1.htm IDEA: XBRL DOCUMENT v3.21.1
Cover Page - shares
 3 Months Ended
Mar. 31, 2021
Apr. 26, 2021
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2021  
Document Transition Report false  
Entity File Number 1-8097  
Entity Registrant Name Valaris plc  
Entity Tax Identification Number 98-0635229  
Entity Incorporation, State or Country Code X0  
Entity Address, Address Line One Cannon Place, 78 Cannon Street  
Entity Address, City or Town London,  
Entity Address, State or Province GB  
Entity Address, Postal Zip Code EC4N 6AF  
City Area Code 44 (0) 20  
Local Phone Number 7659 4660  
Amendment Flag false  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q1  
Entity Central Index Key 0000314808  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Shares, Shares Outstanding   199,730,533
Entity Filer Category Accelerated Filer  
Entity Small Business true