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Income Taxes (Narrative) (Details) $ in Thousands, € in Millions, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 11, 2019 EUR (€) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 AUD ($) | Sep. 30, 2019 AUD ($) | Dec. 31, 2020 EUR (€) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |
Tax Cuts and Jobs Act, Measurement Period Adjustment, Income Tax Expense (Benefit) |  |  |  |  |  |  |  | $ 13,800 | $ 11,700
Income from continuing operations before income taxes in the U.S. countries |  |  |  |  |  |  | $ (51,000) | 39,000 | (115,100)
Income from continuing operations before income taxes in the non-U.S. countries |  |  |  |  |  |  | 5,100,000 | 102,800 | (423,800)
Deferred tax assets related to U.S. foreign tax credits |  | $ 171,200 |  |  |  |  | 171,200 | 142,900 |
Deferred tax assets related to net operating loss carryforwards |  | 2,272,200 |  |  |  |  | 2,272,200 | 1,546,700 |
Net operating loss carryforwards |  | 9,700,000 |  |  |  |  | 9,700,000 |  |
Operating Loss Carryforwards, Limitations on Use |  | 221,200 |  |  |  |  | 221,200 |  |
Operating loss carryforwards, Not subject to expiration |  | 9,500,000 |  |  |  |  | 9,500,000 |  |
Operating loss carryforwards, Subject to expiration |  | 223,000 |  |  |  |  | 223,000 |  |
Valuation allowance on NOL carryforwards and FTC |  | 2,700,000 |  |  |  |  | 2,700,000 |  |
Income Tax Expense (Benefit), Discrete Item |  |  |  |  |  |  | $ 322,400 | 2,300 | 46,000
Effective Income Tax Rate Reconciliation, Debt and Settlement Proceeds |  |  |  |  |  |  |  | 28,300 |
Other discrete income tax expenses |  |  |  |  |  |  |  | $ 26,000 | $ 21,000
Consilidated effective income tax rate excluding discrete items |  |  |  |  |  | (7.60%) | (7.60%) | (14.60%) | (24.80%)
Minimum percentage threshold for recognition of tax benefits |  |  |  |  |  | 50.00% | 50.00% |  |
Total unrecognized tax benefits |  | 237,700 |  |  |  |  | $ 237,700 | $ 296,700 | $ 143,000
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions With Net Operating Loss Carryforwards |  |  |  |  |  |  |  | 32,500 |
Amount of unrecognized tax benefits affecting the consolidated effective income tax rate if recognized |  | 206,200 |  |  |  |  | 206,200 |  |
Amount of accrued interest and penalties included in other liabilities |  | 73,100 |  |  |  |  | 73,100 | 58,900 |
Amount of interest and penalties recognized in net tax expense |  |  |  |  |  |  | 13,800 | 5,700 | 1,900
Income tax benefits, inclusive of interest and penalties due to lapses in statute of limitations |  | 4,300 |  |  |  |  | 4,300 | 5,300 | $ 5,300
Decline in unrecognized tax benefits during next twelve months |  | 2,300 |  |  |  |  | 2,300 |  |
Accrued interest and penalty assessments related to the decline in unrecognized tax benefits |  | 1,000 |  |  |  |  | 1,000 |  |
Aggregate Undistributed Earnings of Subsidiaries to be Continually Reinvested |  | 268,000 |  |  |  |  | 268,000 |  |
Deferred Tax Asset, Restructuring Transactions |  | 998,000 |  |  |  |  | 998,000 |  |
Deferred Tax Assets, Gross |  | 2,868,700 |  |  |  |  | 2,868,700 | 2,814,700 |
Unrecognized Tax Benefits, Period Increase (Decrease) |  |  |  |  |  |  | 122,100 |  |
Deferred Tax Assets, Capital Loss Carryforwards |  | 0 |  |  |  |  | 0 | 998,000 |
Deferred Tax Assets, Net of Valuation Allowance |  | 81,000 |  |  |  |  | 81,000 | 226,000 |
Rowan Companies [Member] |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Gross |  | 66,000 |  |  |  |  | 66,000 |  |
Deferred Tax Assets, Net of Valuation Allowance |  | 5,600,000 |  |  |  |  | 5,600,000 |  |
Rowan Companies [Member] | United States [Member] |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  | 687,300 |  |  |  |  | 687,300 |  |
Rowan Companies [Member] | LUXEMBOURG |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  | 1,400,000 |  |  |  |  | $ 1,400,000 |  |
Minimum |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Foreign, Expiration Date |  |  |  |  |  | 2021 | 2021 |  |
Operating loss carryforwards tax credits expiration year |  |  |  |  |  | 2021 | 2021 |  |
Maximum |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Foreign, Expiration Date |  |  |  |  |  | 2028 | 2028 |  |
Operating loss carryforwards tax credits expiration year |  |  |  |  |  | 2040 | 2040 |  |
Other Liabilities [Member] |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |
Total unrecognized tax benefits |  | 213,000 |  |  |  |  | $ 213,000 | $ 264,200 |
Other Noncurrent Assets [Member] |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |
Total unrecognized tax benefits |  | 4,000 |  |  |  |  | 4,000 |  |
Other Current Assets [Member] |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |
Total unrecognized tax benefits |  | 20,700 |  |  |  |  | 20,700 |  |
Australian Taxation Office [Member] | Rowan Companies [Member] |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized tax benefit, maximum exposure |  | 77,700 | $ 29,000 |  |  |  |  |  |
Tax Assessment Liability |  | $ 17,900 |  |  |  |  | 17,900 |  |
Tax Assessment |  |  |  | $ 101 | $ 42 |  |  |  |
Luxembourg Inland Revenue [Member] | Rowan Companies [Member] |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized tax benefit, maximum exposure |  |  |  |  |  | € 142.0 | 173,500 |  |
Tax Assessment | € | € 93.0 |  |  |  |  | 93.0 |  |  |
Deferred Other Tax Expense (Benefit) |  |  |  |  |  | 79.0 | $ 96,500 |  |
Luxembourg Inland Revenue [Member] | Rowan Companies [Member] | Euro Member Countries, Euro |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |
Other Tax Expense (Benefit) | € |  |  |  |  |  | € 2.0 |  |  |
Luxembourg Inland Revenue [Member] | Rowan Companies [Member] | United States of America, Dollars |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |
Deferred Other Tax Expense (Benefit) | € | € 2.4 |  |  |  |  |  |  |  |

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