| Document and Entity Information Document | Aug. 19, 2020 | Apr. 15, 2020 |
| Entity Information [Line Items] | ||
| Document Type | 8-K | |
| Document Period End Date | Aug. 19, 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 | |
| 4.875%SeniorNotesDue2022Member [Member] | ||
| Entity Information [Line Items] | ||
| Title of 12(b) Security | 4.875% Senior Note due 2022 | |
| Trading Symbol | VAL/22* | |
| 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 | |
| 4.75%SeniorNotesDue2024Member [Member] | ||
| Entity Information [Line Items] | ||
| Title of 12(b) Security | 4.75% Senior Note due 2024 | |
| Trading Symbol | VAL/24* | |
| 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 | |
| 7.38%SeniorNotesDue2025 [Member] | ||
| Entity Information [Line Items] | ||
| Title of 12(b) Security | 7.375% Senior Note due 2025 | |
| Trading Symbol | VAL/25* | |
| 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 | |
| 5.40%SeniorNotesDue2042 [Member] | ||
| Entity Information [Line Items] | ||
| Title of 12(b) Security | 5.4% Senior Note due 2042 | |
| Trading Symbol | VAL/42* | |
| 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 | |
| 5.85%SeniorNotesDue2044 [Member] | ||
| Entity Information [Line Items] | ||
| Title of 12(b) Security | 5.85% Senior Note due 2044 | |
| Trading Symbol | VAL/44* | |
| Security Exchange Name | NYSE |
