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Rowan Transaction Narrative (Details) $ / shares in Units, € in Millions, shares in Millions, $ in Millions				12 Months Ended
	Apr. 11, 2019 USD ($) $ / shares shares	Apr. 11, 2019 EUR (€) shares	Oct. 06, 2017	Dec. 31, 2022 USD ($)	Dec. 31, 2020 USD ($) rigs drillship $ / shares	Dec. 31, 2020 EUR (€) rigs drillship	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($)	Apr. 10, 2019 $ / shares	Oct. 05, 2018 $ / shares
Business Acquisition [Line Items]
Unrecognized Tax Benefits, Increase Resulting from Acquisition					$ 0.0		$ 149.9
Deferred Tax Liabilities, Net							39.9
Total operating revenues					1,427.2		2,053.2	$ 1,705.4
NET LOSS ATTRIBUTABLE TO VALARIS					$ (4,855.5)		$ (198.0)	$ (639.7)
Number of contract drilling rigs | rigs					61	61
Deferred Tax Assets, Net					$ 28.9
Drilling rigs and equipment [Member] | Minimum
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life					4 years	4 years
Drilling rigs and equipment [Member] | Maximum
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life					35 years	35 years
Class A Ordinary Shares, U.S. [Member]
Business Acquisition [Line Items]
Common Stock, Par or Stated Value Per Share | $ / shares					$ 0.40		$ 0.40
Rowan Companies [Member]
Business Acquisition [Line Items]
Common stock, value (in usd per share) | $ / shares	$ 43.67
Consideration transferred	$ 1,400.0				$ 1,402.8
Fair Value of Employee Equity awards	2.6
Merger related costs							$ 18.0
Property and equipment					2,963.8
Intangible assets, net	16.2				2.4
Intangible Liabilities	2.1				0.4
Asset amortization					$ 2.8		3.6
Finite-Lived Intangible Assets, Remaining Amortization Period					1 year	1 year
Unrecognized Tax Benefits, Increase Resulting from Acquisition	$ 50.4
Total operating revenues					$ 448.0
NET LOSS ATTRIBUTABLE TO VALARIS					122.7
Materials And Supplies					83.0
Impairment of Intangible Assets, Finite-lived					$ 5.7
Deferred Tax Assets, Net							$ 99.0
Rowan Companies [Member] | Drilling rigs and equipment [Member]
Business Acquisition [Line Items]
Number of contract drilling rigs | drillship					4	4
Rowan Companies [Member] | Drilling rigs and equipment [Member] | Minimum
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life			30 years		16 years	16 years
Rowan Companies [Member] | Drilling rigs and equipment [Member] | Maximum
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life			35 years		35 years	35 years
Rowan Companies [Member] | Jackup Rigs Member [Member]
Business Acquisition [Line Items]
Number of contract drilling rigs | drillship					19	19
Rowan Companies [Member] | Luxembourg Inland Revenue [Member]
Business Acquisition [Line Items]
Unrecognized tax benefit, maximum exposure					$ 173.5	€ 142.0
Tax Assessment | €		€ 93.0				€ 93.0
Deferred Tax Liabilities, Net					$ 113.6
Rowan Companies [Member] | Forecast [Member]
Business Acquisition [Line Items]
Capitalized Contract Cost, Amortization				$ 2.0
Rowan Companies [Member] | Class A Ordinary Shares, U.S. [Member]
Business Acquisition [Line Items]
Common stock, value (in usd per share) | $ / shares	$ 2.75
Shares Issued, Price Per Share | $ / shares	$ 15.88
Number of ordinary shares | shares	88.3	88.3
Common Stock, Par or Stated Value Per Share | $ / shares	$ 0.40								$ 0.10
Share Price | $ / shares										$ 33.92

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