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Rowan Transaction (Narrative) (Details)
$ / shares in Units, € in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 11, 2019
EUR (€)
Apr. 11, 2019
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
EUR (€)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
USD ($)
Oct. 23, 2018
$ / shares
Business Acquisition [Line Items]                            
Business Combination, Bargain Purchase, Adjustment     $ 0     $ (712,800,000)   $ 6,300,000 $ (712,800,000)          
Tax Assessment       $ 42,000,000                    
Deferred Tax Liabilities, Net     37,100,000         37,100,000         $ 99,000,000.0  
Revenues     388,800,000     583,900,000   845,400,000 989,800,000          
Net Income (Loss) Attributable to Parent     (1,107,400,000)     405,500,000   (4,113,700,000) 215,100,000          
Rowan Companies [Member]                            
Business Acquisition [Line Items]                            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   $ 16,200,000 3,800,000         3,800,000            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities   2,100,000 900,000         900,000            
Impairment of Intangible Assets, Finite-lived               $ 5,700,000            
Finite-Lived Intangible Assets, Remaining Amortization Period             1 year 6 months 1 year 6 months            
Amortization of intangible assets     600,000         $ 1,900,000            
Unrecognized Tax Benefits, Increase Resulting from Acquisition   $ 50,400,000                        
Business Combination, Acquisition Related Costs           $ 15,000,000.0     $ 17,800,000          
Revenues         $ 147,200,000                  
Net Income (Loss) Attributable to Parent         $ 95,300,000                  
Rowan Companies [Member] | Class A ordinary shares, U.S.                            
Business Acquisition [Line Items]                            
Shares Issued, Price Per Share | $ / shares   $ 15.88                        
Share Price | $ / shares                           $ 33.92
Forecast [Member] | Rowan Companies [Member]                            
Business Acquisition [Line Items]                            
Capitalized Contract Cost, Amortization                   $ 2,000,000.0 $ 900,000      
Luxembourg Inland Revenue [Member] | Rowan Companies [Member]                            
Business Acquisition [Line Items]                            
Unrecognized tax benefit, maximum exposure             € 142.0 159,600,000       € 142.0    
Tax Assessment | € € 93.0                          
Deferred Tax Liabilities, Net     $ 104,500,000         $ 104,500,000