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Chapter 11 Proceedings and Ability to Continue as a Going Concern - Narrative (Details) - USD ($)
 1 Months Ended 4 Months Ended 6 Months Ended
Apr. 30, 2021
Aug. 18, 2020
Apr. 30, 2021
Apr. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 25, 2020
Restructuring Cost and Reserve [Line Items]              
Debtor Reorganization Items, Discharge of Claims and Liabilities $ 7,100,000,000            
Amount arranged             $ 500,000,000.0
Plan Of Reorganization, Percent Of Subscription Rights 97.60%            
Debtor in possession, borrowings outstanding         $ 0    
Contractual interest expense     $ 32,600,000 $ 132,900,000      
Common stock, par value per share (in dollars per share or pounds sterling per share) $ 14.39   $ 14.39 $ 14.39 $ 0.01    
Class of Warrant or Right, Outstanding         5,645,161    
Class of Warrant or Right, Exercise Price of Warrants or Rights         $ 131.88    
Warranted, Period Exercisable         7 years    
Predecessor Class A ordinary shares              
Restructuring Cost and Reserve [Line Items]              
Common stock, par value per share (in dollars per share or pounds sterling per share) $ 0.01   $ 0.01 $ 0.01   $ 0.40  
Management Incentive Plan              
Restructuring Cost and Reserve [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 8,960,573   8,960,573 8,960,573      
Senior Noteholders              
Restructuring Cost and Reserve [Line Items]              
Pro rata share   38.48%          
Plan Of Reorganization, Securities Issued 28,859,900            
Senior Noteholders Participating In Rights Offering              
Restructuring Cost and Reserve [Line Items]              
Pro rata share   29.30%          
Plan Of Reorganization, Securities Issued 21,975,000            
Senior Noteholder Who Agreed To Backstop The Rights Offering              
Restructuring Cost and Reserve [Line Items]              
Pro rata share   2.63%          
Amount arranged $ 48,800,000   $ 48,800,000 $ 48,800,000      
Plan Of Reorganization, Securities Issued 1,975,500            
Lenders under Revolving Credit Facility Participating in Rights Offering              
Restructuring Cost and Reserve [Line Items]              
Pro rata share   0.70%          
Plan Of Reorganization, Securities Issued 525,000            
Lenders Under Revolving Credit Facility Who Agreed to Backstop The Rights Offering              
Restructuring Cost and Reserve [Line Items]              
Pro rata share   0.07%          
Amount arranged $ 1,200,000   1,200,000 1,200,000      
Plan Of Reorganization, Securities Issued 49,500            
Two RCF Lendors Participating In The Rights Offering              
Restructuring Cost and Reserve [Line Items]              
Pro rata share   5.30%          
Amount arranged $ 7,800,000   7,800,000 7,800,000      
Plan Of Reorganization, Securities Issued 4,005,000            
Daewoo Shipbuilding & Marine Engineering Co., Ltd.              
Restructuring Cost and Reserve [Line Items]              
Amount arranged $ 5,000,000.0   5,000,000.0 5,000,000.0      
Plan Of Reorganization, Securities Issued 375,000            
Lenders Under Revolving Credit Facility Not Participating in Rights Offering              
Restructuring Cost and Reserve [Line Items]              
Pro rata share   22.98%          
Amount arranged $ 96,100,000   96,100,000 96,100,000      
Plan Of Reorganization, Securities Issued 17,235,000            
First Lien Notes | Two RCF Lendors Participating In The Rights Offering              
Restructuring Cost and Reserve [Line Items]              
Pro rata share   2.427%          
Senior Notes              
Restructuring Cost and Reserve [Line Items]              
Cash payment   $ 26,000,000.0          
Senior Notes | Six Point Eight Seven Five Percent Senior Notes Due Two Thousand Twenty Member              
Restructuring Cost and Reserve [Line Items]              
Interest rate on borrowings outstanding   6.875%          
Senior Notes | Seven Point Eight Seven Five Percent Senior Notes Due Twenty Forty [Member]              
Restructuring Cost and Reserve [Line Items]              
Interest rate on borrowings outstanding   7.875%          
Senior Notes | Four Point Eight Seven Five Percent Senior Notes Due Twenty Twenty Two [Member]              
Restructuring Cost and Reserve [Line Items]              
Interest rate on borrowings outstanding   4.875%          
Senior Notes | Four Point Seven Five Percent Senior Notes Due Twenty Twenty Four [Member]              
Restructuring Cost and Reserve [Line Items]              
Interest rate on borrowings outstanding   4.75%          
Senior Notes | Seven Point Three Seven Five Senior Notes Due Twenty Twenty Five [Member]              
Restructuring Cost and Reserve [Line Items]              
Interest rate on borrowings outstanding   7.375%          
Senior Notes | Five Point Four Zero Percent Senior Notes Due Twenty Forty Two [Member]              
Restructuring Cost and Reserve [Line Items]              
Interest rate on borrowings outstanding   5.40%          
Senior Notes | Five Point Eight Five Percent Senior Notes Due Twenty Forty Four [Member]              
Restructuring Cost and Reserve [Line Items]              
Interest rate on borrowings outstanding   5.85%          
Senior Notes | First Lien Notes              
Restructuring Cost and Reserve [Line Items]              
Debt Instrument, Face Amount $ 550,000,000.0   550,000,000.0 550,000,000.0      
Amount arranged $ 520,000,000   $ 520,000,000 $ 520,000,000      
Senior Notes | Seven Point Two Zero Debenture Due Twenty Twenty Seven              
Restructuring Cost and Reserve [Line Items]              
Interest rate on borrowings outstanding   7.20%