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Rowan Transaction Narrative (Details) $ / shares in Units, shares in Millions, $ in Millions		4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 11, 2019 USD ($) $ / shares shares	Apr. 30, 2021 USD ($) $ / shares	Dec. 31, 2021 USD ($) $ / shares	Dec. 31, 2021 USD ($) rigs $ / shares	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($)	Apr. 10, 2019 $ / shares	Oct. 05, 2018 $ / shares
Business Acquisition [Line Items]
Common Stock, Par or Stated Value Per Share | $ / shares		$ 14.39	$ 0.01	$ 0.01
Total operating revenues		$ 397.4	$ 835.0		$ 1,427.2	$ 2,053.2
NET LOSS ATTRIBUTABLE TO VALARIS		$ (4,467.0)	(33.0)		(4,855.5)	(198.0)
Number of contract drilling rigs | rigs				56
Deferred Tax Assets, Net			$ 68.4	$ 68.4	28.9
Business Combination, Bargain Purchase, Adjustment (Gain) Loss	$ 712.8				$ 6.3	$ 75.8
Drilling rigs and equipment [Member] | Minimum
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life				5 years
Drilling rigs and equipment [Member] | Maximum
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life				35 years
Class A Ordinary Shares, U.S. [Member]
Business Acquisition [Line Items]
Common Stock, Par or Stated Value Per Share | $ / shares		$ 0.01			$ 0.40
Rowan Companies [Member]
Business Acquisition [Line Items]
Common stock, value (in usd per share) | $ / shares	$ 43.67
Consideration transferred	$ 1,400.0
Fair Value of Employee Equity awards	$ 2.6
Merger related costs					$ 18.0
Total operating revenues				$ 448.0
NET LOSS ATTRIBUTABLE TO VALARIS				$ 122.7
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
Common Stock, Par or Stated Value Per Share | $ / shares	$ 0.40						$ 0.10
Share Price | $ / shares								$ 33.92

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