XML 18 R1.htm IDEA: XBRL DOCUMENT v3.20.4
Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2020
Feb. 22, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Transition Report false    
Title of 12(b) Security Class A ordinary shares, U.S. $0.40 par value    
Trading Symbol VALPQ    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Entity File Number 1-8097    
Entity Registrant Name Valaris plc    
Entity Incorporation, State or Country Code X0    
Entity Tax Identification Number 98-0635229    
Entity Address, Address Line One Cannon Place, 78 Cannon Street    
Entity Address, City or Town London,    
Entity Address, Country GB    
Entity Address, Postal Zip Code EC4N 6AF    
City Area Code +44 (0)    
Local Phone Number 20 7659 4660    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Public Float     $ 104,731,000
Entity Common Shares, Shares Outstanding   199,613,642  
Entity Shell Company false    
Amendment Flag false    
Entity Central Index Key 0000314808    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity Emerging Growth Company false    
Entity Small Business true    
ICFR Auditor Attestation Flag true