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Income Taxes (Narrative) (Details)
$ in Thousands, € in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Mar. 31, 2020
USD ($)
Investments, Owned, Federal Income Tax Note [Line Items]              
Tax Cuts and Jobs Act, Measurement Period Adjustment, Income Tax Expense (Benefit)       $ 13,800 $ 11,700 $ 16,500  
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount       46,000      
Income from continuing operations before income taxes in the U.S. countries       39,000 (115,100) 6,300  
Income from continuing operations before income taxes in the non-U.S. countries       102,800 423,800 (202,300)  
Tax Cuts and Jobs Act, Incomplete Accounting, Provisional Income Tax Expense (Benefit)       16,500      
Deferred tax assets related to U.S. foreign tax credits $ 142,900     142,900 123,600    
Deferred tax assets related to net operating loss carryforwards 1,546,700     1,546,700 148,400    
Net operating loss carryforwards 6,400,000     6,400,000      
Operating Loss Carryforwards, Limitations on Use 41,500     41,500      
Operating loss carryforwards, Not subject to expiration 5,600,000     5,600,000      
Operating loss carryforwards, Subject to expiration 773,000     773,000      
Valuation allowance on NOL carryforwards and FTC 1,500,000     1,500,000      
Income Tax Expense (Benefit), Discrete Item       2,300   32,200  
Effective Income Tax Rate Reconciliation, Debt and Settlement Proceeds       28,300      
Other discrete income tax expenses       $ 26,000 $ 21,000 $ 15,700  
Consilidated effective income tax rate excluding discrete items     (14.60%) (14.60%) (24.80%) (96.00%)  
Deferred Tax Assets, Gross 2,814,700     $ 2,814,700 $ 376,200    
Minimum percentage threshold for recognition of tax benefits     50.00% 50.00%      
Total unrecognized tax benefits 296,700     $ 296,700 143,000 $ 147,600  
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions With Net Operating Loss Carryforwards       32,500 6,500    
Amount of unrecognized tax benefits affecting the consolidated effective income tax rate if recognized 253,900     253,900      
Amount of accrued interest and penalties included in other liabilities 58,900     58,900 40,500    
Amount of interest and penalties recognized in net tax expense       5,700 1,900 4,400  
Income tax benefits, inclusive of interest and penalties due to lapses in statute of limitations 5,300     5,300 5,300 1,100  
Decline in unrecognized tax benefits during next twelve months 800     800      
Accrued interest and penalty assessments related to the decline in unrecognized tax benefits 550     550      
Tax Assessment   $ 42,000          
Aggregate Undistributed Earnings of Subsidiaries to be Continually Reinvested 289,000     289,000      
Deferred Tax Asset, Restructuring Transactions 998,000     998,000      
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Foreign Income Tax On Domestic Subsidiaries, Provisional Income Tax Expense (Benefit)           38,500  
Tax Cuts and Jobs Act, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense           17,300  
Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Deferred Tax Liability, Income Tax (Expense) Benefit           20,000  
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Valuation Allowance, Provisional Income Tax Benefit           $ 19,300  
Rowan Companies [Member]              
Investments, Owned, Federal Income Tax Note [Line Items]              
Net operating loss carryforwards 1,300,000     $ 1,300,000      
Minimum              
Investments, Owned, Federal Income Tax Note [Line Items]              
Deferred Tax Assets, Foreign, Expiration Date     2022 2022      
Operating loss carryforwards tax credits expiration year     2020 2020      
Maximum              
Investments, Owned, Federal Income Tax Note [Line Items]              
Deferred Tax Assets, Foreign, Expiration Date     2029 2029      
Operating loss carryforwards tax credits expiration year     2037 2037      
Other Liabilities [Member]              
Investments, Owned, Federal Income Tax Note [Line Items]              
Total unrecognized tax benefits 264,200     $ 264,200 $ 136,500    
Australian Taxation Office [Member] | Rowan Companies [Member]              
Investments, Owned, Federal Income Tax Note [Line Items]              
Unrecognized tax benefit, maximum exposure 70,900 $ 29,000          
Tax Assessment Liability 15,000     15,000      
Tax Assessment 101,000            
Luxembourg Inland Revenue [Member] | Rowan Companies [Member]              
Investments, Owned, Federal Income Tax Note [Line Items]              
Unrecognized tax benefit, maximum exposure     € 142.0 159,000      
Tax Assessment Liability $ 104,000     $ 104,000      
Tax Assessment | €     € 93.0        
Forecast [Member] | Minimum              
Investments, Owned, Federal Income Tax Note [Line Items]              
Deferred Tax Assets, Gross             $ 40,000
Forecast [Member] | Maximum              
Investments, Owned, Federal Income Tax Note [Line Items]              
Deferred Tax Assets, Gross             $ 60,000