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Chapter 11 Proceedings and Ability to Continue as a Going Concern - Narrative (Details) - USD ($)
 3 Months Ended 4 Months Ended 9 Months Ended
Apr. 30, 2021
Aug. 18, 2020
Sep. 30, 2020
Apr. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Sep. 25, 2020
Restructuring Cost and Reserve [Line Items]                
Debtor Reorganization Items, Discharge of Claims and Liabilities $ 7,100,000,000              
Common stock, par value per share (in dollars per share or pounds sterling per share) $ 14.39     $ 14.39 $ 0.01      
Plan Of Reorganization, Percent Of Subscription Rights 97.60%              
Amount arranged               $ 500,000,000
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      
Debtor in possession, borrowings outstanding         $ 0      
Contractual interest expense     $ 45,900,000 $ 132,900,000   $ 45,900,000    
PlanOfReorganizationLegalAndOtherProfessionalAdvisorFees     $ 42,600,000     $ 64,700,000    
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        
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%            
Plan Of Reorganization, Securities Issued 1,975,500              
Amount arranged $ 48,800,000     $ 48,800,000        
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%            
Plan Of Reorganization, Securities Issued 49,500              
Amount arranged $ 1,200,000     1,200,000        
Two RCF Lendors Participating In The Rights Offering                
Restructuring Cost and Reserve [Line Items]                
Pro rata share   5.30%            
Plan Of Reorganization, Securities Issued 4,005,000              
Amount arranged $ 7,800,000     7,800,000        
Lenders Under Revolving Credit Facility Not Participating in Rights Offering                
Restructuring Cost and Reserve [Line Items]                
Pro rata share   22.98%            
Plan Of Reorganization, Securities Issued 17,235,000              
Amount arranged $ 96,100,000     96,100,000        
Daewoo Shipbuilding & Marine Engineering Co., Ltd.                
Restructuring Cost and Reserve [Line Items]                
Plan Of Reorganization, Securities Issued 375,000              
Amount arranged $ 5,000,000     $ 5,000,000        
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     $ 0.40  
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            
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 | 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 | Seven Point Two Zero Debenture Due Twenty Twenty Seven                
Restructuring Cost and Reserve [Line Items]                
Interest rate on borrowings outstanding   7.20%            
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 | 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     $ 550,000,000        
Amount arranged $ 520,000,000     $ 520,000,000