| Document and Entity Information Document | Feb. 13, 2020 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 13, 2020 |
| Entity Registrant Name | Valaris plc |
| Entity Incorporation, State or Country Code | X0 |
| Entity File Number | 1-8097 |
| Entity Tax Identification Number | 98-0635229 |
| Entity Address, Address Line One | 110 Cannon Street |
| Entity Address, City or Town | London |
| Entity Address, State or Province | GB |
| Entity Address, Postal Zip Code | EC4N6EU |
| 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 |
| Amendment Flag | false |
| Entity Central Index Key | 0000314808 |
| 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 Due Two Thousand Twenty One 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 Zero Percent Senior Notes Due Two Thousand Twenty Four [Member] | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | 4.50% Senior Notes due 2024 |
| Trading Symbol | VAL24 |
| Security Exchange Name | NYSE |
| Eight Point Zero Percent Senior Notes Due Two Thousand Twenty Four [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 |
