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Equity Method Investment in ARO Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |
Total operating revenues | $ 2,369.0 | $ 2,362.6 | $ 1,784.2
Cost of Product and Service Sold | 1,629.7 | 1,760.9 | 1,543.6
Loss on impairment | 27.3 | 0.0 | 0.0
Depreciation | 146.3 | 122.1 | 101.1
General and administrative | 97.1 | 116.3 | 99.3
OPERATING INCOME | 477.0 | 352.3 | 53.5
Nonoperating Income (Expense) | (75.3) | (17.9) | (30.7)
Total provision for income taxes | (426.8) | 0.4 | (782.6)
NET INCOME ATTRIBUTABLE TO VALARIS | 982.8 | 373.4 | 865.4
ASSETS |  |  |
Cash and cash equivalents | 599.4 | 368.2 |
Other | 144.7 | 139.3 |
TOTAL ASSETS | 5,304.8 | 4,419.8 |
Liabilities [Abstract] |  |  |
Liabilities, Current | 691.6 | 679.5 |
Liabilities | 2,133.1 | 2,175.5 |
Total assets | 438.5 | 368.9 |
Investment Owned, Balance [Abstract] |  |  |
EQUITY IN EARNINGS (LOSSES) OF ARO | 8.4 | (11.0) | 13.3
ARO |  |  |
Related Party Transactions [Abstract] |  |  |
Lease Revenue From Related Party | 69.4 | 52.6 | 69.2
ARO |  |  |
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |
Total operating revenues | 571.0 | 512.5 | 496.6
Cost of Product and Service Sold | 360.7 | 367.7 | 365.9
Loss on impairment | 0.0 | 28.4 | 0.0
Depreciation | 114.9 | 89.2 | 65.9
General and administrative | 28.8 | 23.7 | 22.2
OPERATING INCOME | 66.6 | 3.5 | 42.6
Nonoperating Income (Expense) | 59.5 | 55.5 | 31.8
Total provision for income taxes | 15.7 | (4.8) | 8.3
NET INCOME ATTRIBUTABLE TO VALARIS | (8.6) | (47.2) | 2.5
ASSETS |  |  |
Cash and cash equivalents | 99.3 | 50.0 |
Other | 148.3 | 127.7 |
Assets, Noncurrent | 1,266.1 | 1,291.1 |
TOTAL ASSETS | 1,513.7 | 1,468.8 |
Liabilities [Abstract] |  |  |
Liabilities, Current | 139.0 | 146.6 |
Liabilities, Noncurrent | 1,263.8 | 1,202.7 |
Liabilities | 1,402.8 | 1,349.3 |
ARO | Assets, Total |  |  |
Liabilities [Abstract] |  |  |
Total assets | 516.6 | 426.1 |
ARO | Liabilities, Total |  |  |
Liabilities [Abstract] |  |  |
Total assets | 78.1 | 57.2 |
ARO |  |  |
Investment Owned, Balance [Abstract] |  |  |
50% interest in ARO net income (loss) | (4.3) | (23.6) | 1.3
Amortization of basis differences | 12.7 | 12.6 | 12.0
EQUITY IN EARNINGS (LOSSES) OF ARO | $ 8.4 | $ (11.0) | $ 13.3

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