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Income Taxes (Narrative) (Details) $ in Thousands, € in Millions, $ in Millions | 3 Months Ended | 4 Months Ended | 8 Months Ended | 12 Months Ended |  |
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Mar. 31, 2020 USD ($) | Mar. 31, 2020 EUR (€) | Sep. 30, 2019 USD ($) | Sep. 30, 2019 AUD ($) | Apr. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 EUR (€) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 EUR (€) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 EUR (€) | Dec. 31, 2019 AUD ($) | Aug. 18, 2020 | Apr. 11, 2019 USD ($) | Apr. 11, 2019 EUR (€)
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Cuts and Jobs Act, Measurement Period Adjustment, Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  | $ 13,800 |  |  |  |  |
Income from continuing operations before income taxes in the U.S. countries |  |  |  |  | $ 373,100 | $ 253,400 |  |  | $ (51,000) |  | 39,000 |  |  |  |  |
Income from continuing operations before income taxes in the non-U.S. countries |  |  |  |  | 4,800,000 | 245,200 |  |  | 5,100,000 |  | (102,800) |  |  |  |  |
Deferred tax assets related to U.S. foreign tax credits |  |  |  |  |  | 105,700 | $ 105,700 |  | 171,200 |  |  |  |  |  |  |
Deferred tax assets related to net operating loss carryforwards |  |  |  |  |  | 2,293,500 | 2,293,500 |  | 2,272,200 |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  |  |  | 10,000,000 | 10,000,000 |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards, Limitations on Use |  |  |  |  |  | 74,800 | 74,800 |  |  |  |  |  |  |  |  |
Operating loss carryforwards, Not subject to expiration |  |  |  |  |  | 9,100,000 | 9,100,000 |  |  |  |  |  |  |  |  |
Operating loss carryforwards, Subject to expiration |  |  |  |  |  | 807,500 | 807,500 |  |  |  |  |  |  |  |  |
Valuation allowance on NOL carryforwards and FTC |  |  |  |  |  | 3,800,000 | 3,800,000 |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit), Discrete Item |  |  |  |  | 2,200 | 15,300 |  |  | $ 322,400 |  | 2,300 |  |  |  |  |
Effective Income Tax Rate Reconciliation, Debt and Settlement Proceeds |  |  |  |  |  |  |  |  |  |  | 28,300 |  |  |  |  |
Other discrete income tax expenses |  |  |  |  |  |  |  |  |  |  | $ 26,000 |  |  |  |  |
Consilidated effective income tax rate excluding discrete items |  |  |  |  |  |  |  |  | (7.60%) | (7.60%) | (14.60%) | (14.60%) | (14.60%) |  |  |
Total unrecognized tax benefits |  |  |  |  | 235,400 | 234,300 | 234,300 |  | $ 237,700 |  | $ 296,700 |  |  |  |  |
Amount of unrecognized tax benefits affecting the consolidated effective income tax rate if recognized |  |  |  |  |  | 208,900 | 208,900 |  |  |  |  |  |  |  |  |
Amount of accrued interest and penalties included in other liabilities |  |  |  |  |  | 108,000 | 108,000 |  | 73,100 |  |  |  |  |  |  |
Amount of interest and penalties recognized in net tax expense |  |  |  |  | 13,500 | 21,300 |  |  | 13,800 |  | 5,700 |  |  |  |  |
Income tax benefits, inclusive of interest and penalties due to lapses in statute of limitations |  |  |  |  | 200 | 17,900 | 17,900 |  | 4,300 |  | 5,300 |  |  |  |  |
Decline in unrecognized tax benefits during next twelve months |  |  |  |  |  | 4,000 | 4,000 |  |  |  |  |  |  |  |  |
Accrued interest and penalty assessments related to the decline in unrecognized tax benefits |  |  |  |  |  | 1,400 | 1,400 |  |  |  |  |  |  |  |  |
Aggregate Undistributed Earnings of Subsidiaries to be Continually Reinvested |  |  |  |  |  | 279,500 | 279,500 |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Gross |  |  |  |  |  | 3,911,900 | 3,911,900 |  | 2,868,700 |  |  |  |  |  |  |
Unrecognized Tax Benefits, Period Increase (Decrease) |  |  |  |  |  |  |  |  | 122,100 |  |  |  |  |  |  |
Deferred Tax Assets, Net of Valuation Allowance |  |  |  |  |  | 82,900 | 82,900 |  | 81,000 |  |  |  |  |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions |  |  |  |  | 0 | 4,500 |  |  | 89,300 |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Switzerland Tax Reform, Amount |  |  |  |  |  | 15,400 |  |  |  |  |  |  |  |  |  |
Income Tax Examination, Increase (Decrease) in Liability from Prior Year |  |  |  |  |  | 30,700 | 30,700 |  |  |  |  |  |  |  |  |
Income Tax Benefit, Fresh Start Accounting Adjustments |  |  |  |  | 19,300 |  |  |  |  |  |  |  |  |  |  |
Change In Liabilities For Unrecognized Tax Benefits |  |  |  |  | $ 21,500 |  |  |  |  |  |  |  |  |  |  |
Four Point Eight Seven Five Percent Senior Notes Due Twenty Twenty Two [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.875% |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.875% |  |
Seven Point Three Seven Five Senior Notes Due Twenty Twenty Five [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.375% |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.375% |  |
Rowan Companies [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Gross |  |  |  |  |  | 66,000 | 66,000 |  |  |  |  |  |  |  |  |
Rowan Companies [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  |  |  | 599,200 | 599,200 |  |  |  |  |  |  |  |  |
Rowan Companies [Member] | LUXEMBOURG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  |  |  | 1,400,000 | 1,400,000 |  |  |  |  |  |  |  |  |
Rowan Companies [Member] | SWITZERLAND |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  |  |  | 56,400 | $ 56,400 |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Foreign, Expiration Date |  |  |  |  |  |  | 2022 | 2022 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Other Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized tax benefits |  |  |  |  |  | 212,200 | $ 212,200 |  | 213,000 |  |  |  |  |  |  |
Other Noncurrent Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized tax benefits |  |  |  |  |  | 1,000 | 1,000 |  | 4,000 |  |  |  |  |  |  |
Other Current Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized tax benefits |  |  |  |  |  | 21,100 | 21,100 |  | 20,700 |  |  |  |  |  |  |
Australian Taxation Office [Member] | Rowan Companies [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefit, maximum exposure |  |  | $ 29,000 |  |  |  |  |  |  |  | 73,400 |  |  |  |  |
Tax Assessment Liability |  |  |  |  |  | $ 18,000 | 18,000 |  |  |  |  |  |  |  |  |
Tax Assessment |  |  |  | $ 42 |  |  |  |  |  |  |  |  | $ 101 |  |  |
Luxembourg Inland Revenue [Member] | Rowan Companies [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination, Estimate of Possible Loss | $ 161,500 | € 142.0 |  |  |  |  |  |  |  |  | 161,500 | € 142.0 |  |  |  |
Income Tax Examination, Penalties Accrued |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 105,700 | € 93.0
Luxembourg Inland Revenue [Member] | Rowan Companies [Member] | Uncertain Tax Positions Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions |  |  |  |  |  |  | $ 15,900 | € 14.0 | $ 2,300 | € 2.0 | $ 89,800 | € 79.0 |  |  |  |

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