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Rowan Transaction (Narrative) (Details) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
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Apr. 11, 2019 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) jackup $ / shares | Jun. 30, 2019 USD ($) jackup $ / shares | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) jackup $ / shares | Jun. 30, 2018 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Apr. 10, 2019 jackup $ / shares | Dec. 31, 2018 $ / shares | Oct. 05, 2018 $ / shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of Rigs Owned by ARO | jackup |  | 7 | 7 |  | 7 |  |  |  |  |  |  |
Number of jackups leased by ARO | jackup |  | 9 | 9 |  | 9 |  |  |  |  |  |  |
Number of Newbuild Jackup Rigs | jackup |  | 20 | 20 |  | 20 |  |  |  |  |  |  |
Years for Jackup Rig Orders |  |  |  |  | 10 years |  |  |  |  |  |  |
Jackups Marked For Retirement | jackup |  | 1 | 1 |  | 1 |  |  |  |  | 2 |  |
Number of Drillships owned by legacy Rowan | jackup |  | 4 | 4 |  | 4 |  |  |  |  |  |  |
Number of Jackup Rigs Owned by Acquiree | jackup |  | 19 | 19 |  | 19 |  |  |  |  |  |  |
Bargain purchase gain |  |  |  |  | $ 712,800,000 | $ 8,300,000 |  |  |  |  |  |
Finite-Lived Intangible Assets, Remaining Amortization Period |  |  |  |  | 2 years 6 months |  |  |  |  |  |  |
Revenues |  | $ 583,900,000 |  | $ 458,500,000 | $ 989,800,000 | 875,500,000 |  |  |  |  |  |
Net Income (Loss) Attributable to Parent |  | $ 405,500,000 |  | (151,000,000.0) | $ 215,100,000 | $ (291,100,000) |  |  |  |  |  |
Class A ordinary shares, U.S. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value per share (in dollars per share or pounds sterling per share) | $ / shares |  | $ 0.40 | $ 0.40 |  | $ 0.40 |  |  |  |  |  | $ 0.40 |
Rowan Companies [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Jackups Marked For Retirement | jackup |  | 2 | 2 |  | 2 |  |  |  |  |  |  |
Number of Drillships owned by legacy Rowan | jackup |  | 4 | 4 |  | 4 |  |  |  |  |  |  |
Number of Jackup Rigs Owned by Acquiree | jackup |  | 19 | 19 |  | 19 |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned, Per Share | $ / shares | $ 43.67 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred | $ 1,402,800,000 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value | 2,600,000 |  |  |  |  |  |  |  |  |  |  |
Bargain purchase gain | 712,800,000 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  | $ 15,000,000.0 |  |  | $ 17,800,000 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Materials And Supplies | 83,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Property and equipment | 2,989,800,000 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 16,200,000 | 14,900,000 | $ 14,900,000 |  | 14,900,000 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 2,100,000 | 1,900,000 | 1,900,000 |  | 1,900,000 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Amortization |  |  | $ 1,100,000 |  |  |  |  |  |  |  |  |
Deferred Other Tax Expense (Benefit) | 10,000,000.0 |  |  |  | 52,000,000.0 |  |  |  |  |  |  |
Deferred Tax Assets, Net | $ 98,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Unrecognized Tax Benefits, Increase Resulting from Acquisition |  |  |  |  | 50,400,000 |  |  |  |  |  |  |
Unrecognized tax benefit, maximum exposure |  |  |  |  | $ 159,000,000.0 |  |  |  |  |  |  |
Revenues |  | $ 147,200,000 |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent |  |  |  | $ 95,300,000 |  |  |  |  |  |  |  |
Rowan Companies [Member] | Class A ordinary shares, U.S. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned, Per Share | $ / shares | $ 2.750 |  |  |  |  |  |  |  |  |  |  |
Share Price | $ / shares | $ 15.88 |  |  |  |  |  |  |  |  |  |  | $ 33.92
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares | 88,300,000 |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | shares | 4 |  |  |  |  |  |  |  |  |  |  |
Common stock, par value per share (in dollars per share or pounds sterling per share) | $ / shares | $ 0.40 |  |  |  |  |  |  |  |  | $ 0.10 |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Capitalized Contract Cost, Amortization |  |  |  |  |  |  | $ 5,400,000 | $ 5,100,000 | $ 2,600,000 |  |  |
Minimum [Member] | Rowan Companies [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 30 years |  | 16 years |  |  |  |  |  |  |  |  |
Maximum [Member] | Rowan Companies [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 35 years |  | 35 years |  |  |  |  |  |  |  |  |

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- Definition Jackups Marked For Retirement + References No definition available. + Details
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Namespace Prefix: | val_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of Drillships owned by legacy Rowan + References No definition available. + Details
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Namespace Prefix: | val_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of Jackup Rigs Owned by Acquiree + References No definition available. + Details
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Namespace Prefix: | val_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of Newbuild Jackup Rigs + References No definition available. + Details
Name: | val_NumberofNewbuildJackupRigs
Namespace Prefix: | val_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of Rigs Owned by ARO + References No definition available. + Details
Name: | val_NumberofRigsOwnedbyARO
Namespace Prefix: | val_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of jackups leased by ARO + References No definition available. + Details
Name: | val_NumberofjackupsleasedbyARO
Namespace Prefix: | val_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Unrecognized tax benefit, maximum exposure + References No definition available. + Details
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Namespace Prefix: | val_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Years for Jackup Rig Orders + References No definition available. + Details
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Namespace Prefix: | val_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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- Details
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- Details
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