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Income Taxes (Narrative) (Details) € in Millions, RM in Millions, R$ in Millions, $ in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended | 24 Months Ended |  |
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Feb. 29, 2024 USD ($) | Feb. 29, 2024 MYR (RM) | Jul. 31, 2023 BRL (R$) | Mar. 31, 2025 USD ($) | Mar. 31, 2025 AUD ($) | Dec. 31, 2024 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 MYR (RM) | Sep. 30, 2019 USD ($) | Sep. 30, 2019 AUD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2025 MYR (RM) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2019 AUD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 EUR (€) | Dec. 31, 2024 AUD ($) | Dec. 31, 2022 USD ($)
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations before income taxes, domestic |  |  |  |  |  |  |  |  |  |  | $ (107.4) |  | $ 49.8 | $ 30.7 |  |  |  |  |
Income from continuing operations before income taxes, foreign |  |  |  |  |  |  |  |  |  |  | (659.7) |  | (320.4) | (53.5) |  |  |  |  |
Deferred tax assets related to net operating loss carryforwards |  |  |  |  |  | $ 3,071.8 |  |  |  |  | 3,103.9 |  | 3,071.8 |  |  | $ 3,103.9 |  |  |
Net operating loss carryforwards |  |  |  |  |  |  |  |  |  |  | 13,600.0 |  |  |  |  | 13,600.0 |  |  |
Operating Loss Carryforwards, Limitations on Use |  |  |  |  |  |  |  |  |  |  | 112.9 |  |  |  |  | 112.9 |  |  |
Operating loss carryforwards, Not subject to expiration |  |  |  |  |  |  |  |  |  |  | 8,400.0 |  |  |  |  | 8,400.0 |  |  |
Operating loss carryforwards, Subject to expiration |  |  |  |  |  |  |  |  |  |  | 5,200.0 |  |  |  |  | 5,200.0 |  |  |
Income Tax Expense (Benefit), Discrete Item |  |  |  |  |  |  |  |  |  |  | $ 153.7 |  | $ 85.8 | $ 42.0 |  |  |  |  |
Consilidated effective income tax rate excluding discrete items |  |  |  |  |  |  |  |  |  |  | (92.20%) | (92.20%) | 21.80% | (872.30%) |  |  |  |  |
Total unrecognized tax benefits |  |  |  |  |  | 93.5 |  |  |  |  | $ 94.8 |  | $ 93.5 | $ 201.4 |  | 94.8 |  |  | $ 217.6
Amount of unrecognized tax benefits affecting the consolidated effective income tax rate if recognized |  |  |  |  |  |  |  |  |  |  | 88.2 |  |  |  |  | 88.2 |  |  |
Income tax benefits, inclusive of interest and penalties due to lapses in statute of limitations |  |  |  |  |  | 2.7 |  |  |  |  | 1.4 |  | 2.7 | 77.3 |  | 1.4 |  |  |
Deferred Tax Assets, Gross |  |  |  |  |  | 856.8 |  |  |  |  | 1,368.0 |  | 856.8 |  |  | 1,368.0 |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions |  |  |  |  |  |  |  |  |  |  | 8.6 |  | 1.4 | 3.4 |  |  |  |  |
Deferred Income Taxes and Tax Credits |  |  |  |  |  |  |  | RM 799.5 |  |  | 523.2 |  | 8.5 | 802.9 |  |  |  |  |
Interest limitation carryforwards |  |  |  |  |  | 126.0 |  |  |  |  | 112.9 |  | 126.0 |  |  | 112.9 |  |  |
Total provision for income taxes |  |  |  |  |  |  |  |  |  |  | (426.8) |  | 0.4 | (782.6) |  |  |  |  |
Deferred Tax Assets, Valuation Allowance |  |  |  |  |  | 3,971.3 |  |  |  |  | 3,292.3 |  | 3,971.3 |  |  | 3,292.3 |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued |  |  |  |  |  | 128.3 |  |  |  |  | 136.2 |  | 128.3 |  |  | 136.2 |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense |  |  |  |  |  |  |  |  |  |  | 1.5 |  | 8.0 | 35.4 |  |  |  |  |
Amount of accrued interest and penalties included in other liabilities |  |  |  |  |  | 45.5 |  |  |  |  | 48.0 |  | 45.5 |  |  | 48.0 |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  |  |  |  |  | 18.0 |  |  |  |  | 7.0 |  | 103.5 | 41.8 |  |  |  |  |
Amount agreed with Australia tax authorities for tax assessment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.0 |
Loss Contingency, Damages Sought, Value | R$ |  |  | R$ 601.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value | R$ |  |  | R$ 601.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax expense (benefit), foreign |  |  |  | $ 168.8 |  |  |  |  |  |  | (515.1) |  | 10.2 | (788.3) |  |  |  |  |
Luxembourg subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total provision for income taxes |  |  |  |  |  |  | $ (65.0) |  |  |  |  |  |  |  |  |  |  |  |
Liability for Uncertainty in Income Taxes, Noncurrent |  |  |  |  |  | 65.0 |  |  |  |  |  |  | 65.0 |  |  |  | € 60.0 |  |
Liability for Uncertainty in Income Taxes, Noncurrent |  |  |  |  |  | 65.0 |  |  |  |  |  |  | 65.0 |  |  |  | € 60.0 |  |
Luxembourg |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Income Taxes and Tax Credits | RM |  |  |  |  |  |  |  |  |  |  |  | RM 1,100.0 |  |  |  |  |  |  |
Switzerland |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Income Taxes and Tax Credits | RM |  |  |  |  |  |  |  |  |  |  |  | RM 383.9 |  |  |  |  |  |  |
Rowan Companies [Member] | Luxembourg |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  |  |  |  |  |  |  |  | 2,300.0 |  |  |  |  | 2,300.0 |  |  |
Rowan Companies [Member] | U.S. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  |  |  |  |  |  |  |  | 614.9 |  |  |  |  | 614.9 |  |  |
Rowan Companies [Member] | Switzerland |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  |  |  |  |  |  |  |  | 27.2 |  |  |  |  | 27.2 |  |  |
Rowan Companies [Member] | United Kingdom |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  |  |  |  |  |  |  |  | 75.7 |  |  |  |  | 75.7 |  |  |
Rowan Companies [Member] | Bermuda |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  |  |  |  |  |  |  |  | 58.7 |  |  |  |  | 58.7 |  |  |
Rowan Companies [Member] | Trinidad |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  |  |  |  |  |  |  |  | $ 21.2 |  |  |  |  | 21.2 |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating loss carryforwards tax credits expiration year |  |  |  |  |  |  |  |  |  |  | 2042 | 2042 |  |  |  |  |  |  |
Interest limitation carryforwards |  |  |  |  |  |  |  |  |  |  | $ 0.5 |  |  |  |  | 0.5 |  |  |
Other Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized tax benefits |  |  |  |  |  | 82.8 |  |  |  |  | 88.2 |  | 82.8 |  |  | 88.2 |  |  |
Other Noncurrent Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized tax benefits |  |  |  |  |  | 10.7 |  |  |  |  | 6.6 |  | 10.7 |  |  | 6.6 |  |  |
Australian Taxation Office |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount agreed with Australia tax authorities for tax assessment |  |  |  |  |  | $ 2.0 |  |  |  |  |  |  | 2.0 |  |  |  |  |  |
Payments for Other Taxes |  |  |  |  |  |  |  |  | $ 29.0 | $ 42.0 |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 101.0 |  |  |  |
Proceeds from Income Tax Refund, Foreign |  |  |  | 26.0 | $ 42.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 101.0 |  |  |  |
Proceeds from Income Tax Refund, Foreign |  |  |  | $ 26.0 | $ 42.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bermuda |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Valuation Allowance |  |  |  |  |  |  |  |  |  |  |  |  |  | 27.5 |  |  |  |  |
Deferred Tax Assets, Deferred Income |  |  |  |  |  |  |  |  |  |  |  |  |  | 27.5 |  |  |  |  |
Deferred Tax Assets, Deferred Income |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 27.5 |  |  |  |  |
Malaysia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination, Penalties and Interest Expense | $ 29.0 | RM 117.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Other Taxes |  |  |  |  |  |  |  |  |  |  | $ 8.0 |  | $ 18.0 |  |  | $ 26.0 |  |  |

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