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Document and Entity Information Document
 12 Months Ended
Dec. 31, 2019
Entity Information [Line Items]  
Document Type 8-K
Document Period End Date Dec. 31, 2019
Entity Registrant Name Valaris plc
Entity Central Index Key 0000314808
Amendment Flag false
Entity Incorporation, State or Country Code X0
Entity File Number 1-8097
Entity Tax Identification Number 98-0635229
Entity Address, Address Line One 6 Chesterfield Gardens
Entity Address, City or Town London
Entity Address, Country GB
Entity Address, Postal Zip Code W1J5BQ
City Area Code 44 (0)
Local Phone Number 20 7659 4660
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Class A Ordinary Shares, US 0.40 Par Value [Member]  
Entity Information [Line Items]  
Title of 12(b) Security Class A ordinary shares, U.S. $0.40 par value
Trading Symbol VAL
Security Exchange Name NYSE
Four Point Seven Zero Percent Senior Notes Member  
Entity Information [Line Items]  
Title of 12(b) Security 4.70% Senior Notes due 2021
Trading Symbol VAL21
Security Exchange Name NYSE
Four Point Five Percent Senior Notes Member [Member]  
Entity Information [Line Items]  
Title of 12(b) Security 4.50% Senior Notes due 2024
Trading Symbol VAL24
Security Exchange Name NYSE
Eight Percent Senior Notes Member  
Entity Information [Line Items]  
Title of 12(b) Security 8.00% Senior Notes due 2024
Trading Symbol VAL24A
Security Exchange Name NYSE
Five Point Two Percent Senior Notes [Member]  
Entity Information [Line Items]  
Title of 12(b) Security 5.20% Senior Notes due 2025
Trading Symbol VAL25A
Security Exchange Name NYSE
Seven Point Seven Five Percent Senior Notes Due Two Thousand Twenty Six [Member]  
Entity Information [Line Items]  
Title of 12(b) Security 7.75% Senior Notes due 2026
Trading Symbol VAL26
Security Exchange Name NYSE
Five Point Seven Five Percent Senior Notes [Member]  
Entity Information [Line Items]  
Title of 12(b) Security 5.75% Senior notes due 2044
Trading Symbol VAL44
Security Exchange Name NYSE