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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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