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Income Taxes (Narrative) (Details) € in Millions, $ in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 4 Months Ended | 8 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 29, 2024 EUR (€) | Dec. 31, 2023 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2019 AUD ($) | Apr. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 AUD ($) | Dec. 31, 2023 EUR (€) | Dec. 31, 2020 USD ($)
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations before income taxes in the U.S. countries |  |  |  |  | $ 373.1 | $ 253.4 | $ 30.7 |  | $ 39.7 |  |  |  |
Income from continuing operations before income taxes in the non-U.S. countries |  |  |  |  | (4,800.0) | 240.6 | (53.5) |  | (185.2) |  |  |  |
Deferred tax assets related to net operating loss carryforwards |  | $ 3,308.9 |  |  |  |  | 3,308.9 |  | 3,028.7 |  |  |  |
Net operating loss carryforwards |  | 14,200.0 |  |  |  |  | 14,200.0 |  |  |  |  |  |
Operating Loss Carryforwards, Limitations on Use |  | 123.4 |  |  |  |  | 123.4 |  |  |  |  |  |
Operating loss carryforwards, Not subject to expiration |  | 13,200.0 |  |  |  |  | 13,200.0 |  |  |  |  |  |
Operating loss carryforwards, Subject to expiration |  | 1,000.0 |  |  |  |  | 1,000.0 |  |  |  |  |  |
Income Tax Expense (Benefit), Discrete Item |  |  |  |  | $ 2.2 | $ 14.3 | $ 42.0 |  | $ 10.3 |  |  |  |
Consilidated effective income tax rate excluding discrete items |  |  |  |  | (12.90%) | 213.90% | (872.30%) | (872.30%) | 73.60% |  |  |  |
Total unrecognized tax benefits |  | 201.4 |  |  | $ 235.4 | $ 235.1 | $ 201.4 |  | $ 217.6 |  |  |  | $ 237.7
Amount of unrecognized tax benefits affecting the consolidated effective income tax rate if recognized |  | 171.2 |  |  |  |  | 171.2 |  |  |  |  |  |
Income tax benefits, inclusive of interest and penalties due to lapses in statute of limitations |  | 77.3 |  |  | 0.2 | 17.9 | 77.3 |  | 4.5 |  |  |  |
Deferred Tax Assets, Gross |  | 881.7 |  |  |  |  | 881.7 |  | 88.6 |  |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions |  |  |  |  | 0.0 | 4.5 | 3.4 |  | 1.0 |  |  |  |
Effective Income Tax Rate Reconciliation, Switzerland Tax Reform, Amount |  |  |  |  |  | 15.4 |  |  |  |  |  |  |
Income Tax Examination, Increase (Decrease) in Liability from Prior Year |  |  |  |  | 21.5 | 29.7 |  |  | 17.2 |  |  |  |
Income Tax Benefit, Fresh Start Accounting Adjustments |  |  |  |  | 19.3 |  |  |  |  |  |  |  |
Deferred Income Taxes and Tax Credits |  | 799.5 |  |  |  |  | 802.9 |  | 9.8 |  |  |  |
Deferred Tax Expense |  |  |  |  |  |  |  |  | 1.5 |  |  |  |
Interest limitation carryforwards |  | 123.4 |  |  |  |  | 123.4 |  | 193.4 |  |  |  |
Total provision for income taxes |  |  |  |  | 16.2 | 36.4 | (782.6) |  | 43.1 |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  |  |  |  |  | 275.0 |  |  |  |  |  |
Deferred Tax Assets, Valuation Allowance |  | 4,192.4 |  |  |  |  | 4,192.4 |  | 4,720.3 |  |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued |  | 224.0 |  |  |  |  | 224.0 |  | 275.0 |  |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense |  |  |  |  | $ 13.5 | $ 20.3 | 35.4 |  | 12.5 |  |  |  |
Undistributed Earnings of Foreign Subsidiaries |  | 298.2 |  |  |  |  | 298.2 |  |  |  |  |  |
Amount of accrued interest and penalties included in other liabilities |  | 52.3 |  |  |  |  | 52.3 |  | 87.8 |  |  |  |
Rowan Companies [Member] | LUXEMBOURG |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  | 2,400.0 |  |  |  |  | 2,400.0 |  |  |  |  |  |
Rowan Companies [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  | 607.5 |  |  |  |  | 607.5 |  |  |  |  |  |
Rowan Companies [Member] | SWITZERLAND |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  | 88.6 |  |  |  |  | 88.6 |  |  |  |  |  |
Rowan Companies [Member] | United Kingdom [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  | 78.0 |  |  |  |  | $ 78.0 |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Foreign, Expiration Date |  |  |  |  |  |  | 2026 | 2026 |  |  |  |  |
Operating loss carryforwards tax credits expiration year |  |  |  |  |  |  | 2040 | 2040 |  |  |  |  |
Interest limitation carryforwards |  | 0.5 |  |  |  |  | $ 0.5 |  |  |  |  |  |
Other Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized tax benefits |  | 171.7 |  |  |  |  | 171.7 |  | 187.2 |  |  |  |
Other Noncurrent Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized tax benefits |  |  |  |  |  |  |  |  | 0.2 |  |  |  |
Other Current Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized tax benefits |  | 29.7 |  |  |  |  | 29.7 |  | $ 30.2 |  |  |  |
Australian Taxation Office [Member] | Rowan Companies [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefit, maximum exposure |  |  | $ 29.0 |  |  |  |  |  |  | $ 69.0 |  |  |
Tax Assessment Liability |  | 18.8 |  |  |  |  | 18.8 |  |  |  |  |  |
Tax Assessment |  |  |  | $ 42 |  |  |  |  |  |  | $ 101 |  |
Luxembourg Taxation Office |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefit, maximum exposure |  |  |  |  |  |  | 127.0 |  |  |  |  |  |
Tax Assessment Liability |  | $ 66.0 |  |  |  |  | $ 66.0 |  |  |  |  | € 60.0 |
Tax Assessment | € |  |  |  |  |  |  |  | € 115.0 |  |  |  |  |
Luxembourg Taxation Office | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Credits and Adjustments | € | € 60.0 |  |  |  |  |  |  |  |  |  |  |  |
Revision of Tax Assessment | € | € 55.0 |  |  |  |  |  |  |  |  |  |  |  |

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