| Document and Entity Information Document | Nov. 01, 2021 |
| Entity Information [Line Items] | |
| Entity Central Index Key | 0000314808 |
| Document Type | 8-K |
| Document Period End Date | Nov. 1, 2021 |
| Entity Registrant Name | Valaris Limited |
| Entity Incorporation, State or Country Code | D0 |
| Entity File Number | 001-08097 |
| Entity Tax Identification Number | 98-1589854 |
| Entity Address, Address Line One | Claredon House, 2 Church Street |
| Entity Address, City or Town | Hamilton |
| Entity Address, Country | BM |
| Entity Address, Postal Zip Code | HM 11 |
| 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 |
| Common Class A | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Common Shares, $0.01 par value share |
| Trading Symbol | VAL |
| Security Exchange Name | NYSE |
| Warrant | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Warrants to purchase Common Shares |
| Trading Symbol | VAL WS |
| Security Exchange Name | NYSE |
