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Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |
Total current assets | $ 1,125.0 |  | $ 1,172.9
Total assets | 11,946.9 |  | 12,873.2
Total current liabilities | 467.4 |  | 426.8
Investment Owned, Balance [Abstract] |  |  |
Equity in earnings (losses) of ARO | 1.9 | $ (6.3) |
ARO |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |
Total current assets | 582.0 |  | 585.2
Total liabilities | 34.9 |  | 30.9
Maximum exposure to loss | 547.1 |  | 554.3
Investment Owned, Balance [Abstract] |  |  |
50% interest in ARO net income | 4.1 | 1.6 |
Amortization of basis differences | (2.2) | (7.9) |
Equity in earnings (losses) of ARO | 1.9 | (6.3) |
ARO |  |  |
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |
Equity Method Investment Summarized Fin Information Revenue | 122.7 | 140.3 |
Contract drilling (exclusive of depreciation) | 86.3 | 108.3 |
Depreciation | 16.1 | 13.0 |
General and administrative | 3.0 | 8.3 |
Operating income | 17.3 | 10.7 |
Other expense, net | 4.5 | 6.6 |
Provision for income taxes | 4.5 | 0.9 |
Equity Method Investment Summarized Fin Information Net Income Loss | 8.3 | $ 3.2 |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |
Total current assets | 364.6 |  | 358.6
Assets, Noncurrent | 789.0 |  | 804.0
Total assets | 1,153.6 |  | 1,162.6
Total current liabilities | 52.3 |  | 70.8
Liabilities, Noncurrent | 952.1 |  | 950.8
Total liabilities | $ 1,004.4 |  | $ 1,021.6

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Namespace Prefix: | val_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=val_AROMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=val_AROMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |