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Cover Page - shares	9 Months Ended
	Sep. 30, 2020	Oct. 23, 2020
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	1-8097
Entity Registrant Name	Valaris plc
Entity Tax Identification Number	98-0635229
Entity Incorporation, State or Country Code	X0
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	EC4N 6EU
City Area Code	44 (0) 20
Local Phone Number	7659 4660
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Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Entity Central Index Key	0000314808
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Shares, Shares Outstanding		199,467,198
Class A ordinary shares, U.S. $0.40 par value
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
4.70% Senior Notes due 2021
Entity Information [Line Items]
Title of 12(b) Security	4.70% Senior Notes due 2021
Trading Symbol	VAL21*
Security Exchange Name	NYSE
4.50% Senior Notes due 2024
Entity Information [Line Items]
Title of 12(b) Security	4.50% Senior Notes due 2024
Trading Symbol	VAL24*
Security Exchange Name	NYSE
8.00% Senior Notes due 2024
Entity Information [Line Items]
Title of 12(b) Security	8.00% Senior Notes due 2024
Trading Symbol	VAL24A*
Security Exchange Name	NYSE
5.20% Senior Notes due 2025
Entity Information [Line Items]
Title of 12(b) Security	5.20% Senior Notes due 2025
Trading Symbol	VAL25A*
Security Exchange Name	NYSE
7.75% Senior Notes due 2026
Entity Information [Line Items]
Title of 12(b) Security	7.75% Senior Notes due 2026
Trading Symbol	VAL26*
Security Exchange Name	NYSE
5.75% Senior notes due 2044
Entity Information [Line Items]
Title of 12(b) Security	5.75% Senior Notes due 2044
Trading Symbol	VAL44*
Security Exchange Name	NYSE
4.875% Senior Notes Due 2022 Member [Member]
Entity Information [Line Items]
Title of 12(b) Security	4.875% Senior Notes due 2022
Trading Symbol	VAL/22*
Security Exchange Name	NYSE
4.75% Senior Notes Due 2024 Member [Member]
Entity Information [Line Items]
Title of 12(b) Security	4.75% Senior Notes due 2024
Trading Symbol	VAL/24*
Security Exchange Name	NYSE
7.38% Senior Notes Due 2025 [Member]
Entity Information [Line Items]
Title of 12(b) Security	7.375% Senior Notes due 2025
Trading Symbol	VAL/25*
Security Exchange Name	NYSE
5.40% Senior Notes Due 2042 [Member]
Entity Information [Line Items]
Title of 12(b) Security	5.4% Senior Notes due 2042
Trading Symbol	VAL/42*
Security Exchange Name	NYSE
5.85% Senior Notes Due 2044 [Member]
Entity Information [Line Items]
Title of 12(b) Security	5.85% Senior Notes due 2044
Trading Symbol	VAL/44*
Security Exchange Name	NYSE

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