Condensed Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Income Statement [Abstract]
OPERATING REVENUES	$ 620.7	$ 525.0
OPERATING EXPENSES
Total contract drilling expenses (exclusive of depreciation)	415.0	444.8
Loss on impairment	7.8	0.0
Depreciation	33.1	26.8
General and administrative	24.4	26.5
Total operating expenses	480.3	498.1
Equity in earnings of ARO	(2.6)	(2.4)
OPERATING INCOME	143.0	29.3
OTHER INCOME (EXPENSE)
Interest income	14.4	21.0
Interest expense, net	(24.3)	(17.7)
Other, net	21.2	5.8
OTHER INCOME (EXPENSE), NET	11.3	9.1
INCOME BEFORE INCOME TAXES	154.3	38.4
PROVISION FOR INCOME TAXES
Current income tax expense	23.7	10.9
Deferred income tax expense	169.8	2.0
Total provision for income taxes	193.5	12.9
Net income (loss)	(39.2)	25.5
NET LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	1.3	0.0
NET INCOME (LOSS) ATTRIBUTABLE TO VALARIS	$ (37.9)	$ 25.5
EARNINGS (LOSS) PER SHARE
Basic (in dollars per share)	$ (0.53)	$ 0.35
Diluted (in dollars per share)	$ (0.53)	$ 0.35
WEIGHTED-AVERAGE SHARES OUTSTANDING
Basic (in shares)	71.0	72.4
Diluted (in shares)	71.0	73.6
Revenues Excluding Reimbursable Revenues	$ 577.8	$ 491.2
Reimbursable Revenues	42.9	33.8
Contract Drilling Expenses Exclusive of Depreciation and Reimbursable Expenses	374.0	412.5
Reimbursable Expenses	$ 41.0	$ 32.3

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

Name:	us-gaap_AssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.