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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