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Chapter 11 Proceedings and Ability to Continue as Going Concern - Condensed Combined Statement of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |
NET LOSS | $ (4,857.6) | $ (192.2) | $ (636.6)
Net Cash Provided by (Used In) Operating Activities [Abstract] |  |  |
Asset Impairment Charges | 3,646.2 | 104.0 | 40.3
Depreciation expense | 540.8 | 609.7 | 478.9
Debtor in Possession financing fees and payments on Backstop Agreement | 40.0 | 0.0 | 0.0
Equity in losses of ARO | 7.8 | 12.6 | 0.0
Business Combination, Bargain Purchase, Adjustment (Gain) Loss | 6.3 | 75.8 |
Amortization, Net | 6.2 | (16.8) | (40.2)
(Gain) loss on debt extinguishment | (3.1) | (194.1) | 19.0
Other Noncash Income (Expense) | 6.9 | 9.9 | 26.2
Changes in operating assets and liabilities, net of acquisition | (22.0) | (52.5) | (20.8)
Net Cash Provided by (Used in) Operating Activities, Total | (251.7) | (276.9) | (55.7)
INVESTING ACTIVITIES |  |  |
Payments to Acquire Property, Plant, and Equipment | (93.8) | (227.0) | (426.7)
Net proceeds from disposition of assets | 51.8 | 17.7 | 11.0
Net Cash Provided by (Used in) Investing Activities, Total | (42.0) | 1,051.6 | (304.7)
FINANCING ACTIVITIES |  |  |
Borrowings on credit facility | 596.0 | 215.0 | 0.0
Repayments of credit facility borrowings | (15.0) | (215.0) | 0.0
Repayments of Long-term Debt | (9.7) | (928.1) | (771.2)
Other | (1.9) | (10.2) | (5.7)
Net cash provided by (used in) financing activities | 522.2 | (952.3) | 188.2
Effect of exchange rate changes on cash and cash equivalents | 0.1 | (0.3) | (0.6)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect | 228.6 | (177.9) | (170.3)
Amortization of Debt Discount (Premium) | 36.8 | 31.5 | (7.2)
Deferred income tax expense | (105.7) | 23.9 | 56.6
Share-based compensation expense | 21.4 | 37.3 | $ 29.9
Valaris, PLC And Certain Subsidiaries Party To The Bankruptcy Cases [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
NET LOSS | (4,813.6) |  |
Net Cash Provided by (Used In) Operating Activities [Abstract] |  |  |
Asset Impairment Charges | 3,643.9 |  |
Depreciation expense | 507.5 |  |
Restructuring Charges | 436.4 |  |
Debtor in Possession financing fees and payments on Backstop Agreement | 40.0 |  |
Equity in earnings of non-debtor subsidiaries | (11.4) |  |
Equity in losses of ARO | 7.8 |  |
Business Combination, Bargain Purchase, Adjustment (Gain) Loss | 6.3 |  |
Amortization, Net | 6.2 |  |
(Gain) loss on debt extinguishment | (3.1) |  |
Other Noncash Income (Expense) | 17.5 |  |
Changes in operating assets and liabilities, net of acquisition | (44.5) |  |
Changes in advances (to)/from non-debtor subsidiaries | (74.0) |  |
Net Cash Provided by (Used in) Operating Activities, Total | (330.3) |  |
INVESTING ACTIVITIES |  |  |
Payments to Acquire Property, Plant, and Equipment | (93.8) |  |
Net proceeds from disposition of assets | 51.8 |  |
Net Cash Provided by (Used in) Investing Activities, Total | (42.0) |  |
FINANCING ACTIVITIES |  |  |
Borrowings on credit facility | 596.0 |  |
Debtor-in-Possession Facility Fees | (40.0) |  |
Repayments of credit facility borrowings | (15.0) |  |
Repayments of Long-term Debt | (9.7) |  |
Other | (1.8) |  |
Net cash provided by (used in) financing activities | 529.5 |  |
Effect of exchange rate changes on cash and cash equivalents | 0.0 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect | 157.2 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 228.9 | $ 71.7 |
Amortization of Debt Discount (Premium) | 36.8 |  |
Deferred income tax expense | (107.5) |  |
Share-based compensation expense | $ 21.4 |  |

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