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Equity Method Investment in ARO Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($) $ in Millions | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |  |  |
OPERATING REVENUES | $ 397.4 | $ 835.0 | $ 1,784.2 | $ 1,602.5 |
Depreciation | 159.6 | 66.1 | 101.1 | 91.2 |
General and administrative | 30.7 | 58.2 | 99.3 | 80.9 |
OPERATING INCOME (LOSS) | (890.1) | (7.3) | 53.5 | 37.2 |
Nonoperating Income (Expense) | (3,557.5) | 20.1 | 30.7 | 187.7 |
Total provision for income taxes | 16.2 | 36.4 | (782.6) | 43.1 |
NET INCOME (LOSS) ATTRIBUTABLE TO VALARIS | (4,467.0) | (27.4) | 865.4 | 176.5 |
ASSETS |  |  |  |  |
Cash and cash equivalents | 607.6 |  | 620.5 | 724.1 |
Other | 90.5 |  | 177.2 | 148.6 |
TOTAL ASSETS | 2,595.6 |  | 4,322.2 | 2,860.3 |
Liabilities [Abstract] |  |  |  |  |
Liabilities, Current | 390.6 |  | 744.3 | 504.4 |
Liabilities |  |  | 2,325.2 | 1,562.4 |
Total assets |  |  | 343.5 | 317.9 |
Investment Owned, Balance [Abstract] |  |  |  |  |
EQUITY IN EARNINGS OF ARO | 3.1 | 6.1 | 13.3 | 24.5 |
ARO |  |  |  |  |
Related Party Transactions [Abstract] |  |  |  |  |
Lease Revenue From Related Party | 21.7 | 35.4 | 69.2 | 56.7 |
ARO |  |  |  |  |
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |  |  |
OPERATING REVENUES |  |  | 496.6 | 459.5 | $ 470.6
Contract drilling (exclusive of depreciation) |  |  | 365.9 | 341.8 | 362.3
Depreciation |  |  | 65.9 | 63.4 | 65.2
General and administrative |  |  | 22.2 | 18.7 | 17.8
OPERATING INCOME (LOSS) |  |  | 42.6 | 35.6 | 25.3
Nonoperating Income (Expense) |  |  | 31.8 | 11.1 | 13.4
Total provision for income taxes |  |  | 8.3 | 3.8 | 7.9
NET INCOME (LOSS) ATTRIBUTABLE TO VALARIS |  |  | 2.5 | 20.7 | $ 4.0
ASSETS |  |  |  |  |
Cash and cash equivalents |  |  | 92.9 | 176.2 |
Other |  |  | 184.0 | 140.6 |
Assets, Noncurrent |  |  | 1,081.0 | 818.1 |
TOTAL ASSETS |  |  | 1,357.9 | 1,134.9 |
Liabilities [Abstract] |  |  |  |  |
Liabilities, Current |  |  | 136.0 | 86.3 |
Liabilities, Noncurrent |  |  | 1,056.8 | 884.6 |
Liabilities |  |  | 1,192.8 | 970.9 |
ARO | Assets, Total |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |
Total assets |  |  | 417.1 | 377.8 |
ARO | Liabilities, Total |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |
Total assets |  |  | 73.6 | 59.9 |
ARO |  |  |  |  |
Investment Owned, Balance [Abstract] |  |  |  |  |
50% interest in ARO net income (loss) | 6.0 | (4.0) | 1.3 | 10.4 |
Amortization of basis differences | (2.9) | 10.1 | 12.0 | 14.1 |
EQUITY IN EARNINGS OF ARO | $ 3.1 | $ 6.1 | $ 13.3 | $ 24.5 |

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