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Rowan Transaction Narrative (Details) $ / shares in Units, € in Millions, shares in Millions, $ in Millions				3 Months Ended								12 Months Ended
	Apr. 11, 2019 EUR (€) rigs shares	Apr. 11, 2019 USD ($) rigs $ / shares shares	Oct. 06, 2017	Dec. 31, 2019 USD ($) $ / shares	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) $ / shares	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 EUR (€) drillship jackup rigs	Dec. 31, 2019 USD ($) drillship jackup rigs $ / shares	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($)	Apr. 10, 2019 $ / shares	Oct. 05, 2018 $ / shares
Business Acquisition [Line Items]
Number of contract drilling rigs | rigs														74	74
Unrecognized Tax Benefits, Increase Resulting from Acquisition															$ 149.9	$ 0.0
Tax Assessment					$ 42.0
Deferred Tax Liabilities, Net				$ 39.9				$ 34.8							39.9	34.8
OPERATING REVENUES				512.1	551.3	$ 583.9	$ 405.9	399.0	$ 430.9	$ 458.5	$ 417.0				2,053.2	1,705.4	$ 1,843.0
NET LOSS ATTRIBUTABLE TO VALARIS				$ (216.0)	$ (197.1)	$ 405.5	$ (190.4)	$ (203.6)	$ (145.0)	$ (151.0)	$ (140.1)				$ (198.0)	$ (639.7)	$ (303.7)
Class A Ordinary Shares, U.S. [Member]
Business Acquisition [Line Items]
Common Stock, Par or Stated Value Per Share | $ / shares				$ 0.40				$ 0.40							$ 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
Materials And Supplies				$ 83.0											83.0
Property and equipment				2,964.0											2,964.0
Intangible assets, net		16.2		11.9											11.9
Intangible Liabilities		2.1		1.4											1.4
Asset amortization															$ 3.6
Finite-Lived Intangible Assets, Remaining Amortization Period														2 years	2 years
Deferred Tax Assets, Net				99.0											$ 99.0
Unrecognized Tax Benefits, Increase Resulting from Acquisition		50.4
OPERATING REVENUES															448.0
NET LOSS ATTRIBUTABLE TO VALARIS															122.7
Rowan Companies [Member] | Luxembourg Inland Revenue [Member]
Business Acquisition [Line Items]
Unrecognized tax benefit, maximum exposure														€ 142.0	159.0
Deferred Other Tax Expense (Benefit)	€ 46.0	$ 52.6												47.0	52.0
Tax Assessment | €														€ 93.0
Deferred Tax Liabilities, Net				$ 104.6											$ 104.6
Rowan Companies [Member] | Forecast [Member]
Business Acquisition [Line Items]
Capitalized Contract Cost, Amortization												$ 5.4	$ 5.1
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
Jackup Rigs [Member]
Business Acquisition [Line Items]
Number of contract drilling rigs | rigs														50	50
Jackup Rigs [Member] | Rowan Companies [Member]
Business Acquisition [Line Items]
Number of contract drilling rigs	19	19												19	19
Drilling rigs and equipment [Member] | Rowan Companies [Member]
Business Acquisition [Line Items]
Number of contract drilling rigs | drillship														4	4
Minimum | Drilling rigs and equipment [Member]
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life														4 years	4 years
Minimum | Drilling rigs and equipment [Member] | Rowan Companies [Member]
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life			30 years											16 years	16 years
Maximum | Drilling rigs and equipment [Member]
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life														35 years	35 years
Maximum | Drilling rigs and equipment [Member] | Rowan Companies [Member]
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life			35 years											35 years	35 years

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