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Chapter 11 Proceedings and Ability to Continue as a Going Concern - Narrative (Details) - USD ($)
 4 Months Ended 12 Months Ended
Apr. 30, 2021
Aug. 18, 2020
Apr. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Sep. 25, 2020
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]              
Debtor-in-Possession Financing, Amount Arranged           $ 500,000,000  
Contractual Interest Expense on Prepetition Liabilities Not Recognized in Statement of Operations     $ 132,900,000   $ 140,700,000    
Plan Of Reorganization, Legal And Other Professional Advisor Fees         64,700,000    
Debtor Reorganization Items, Discharge of Claims and Liabilities $ 7,100,000,000            
Common Stock, Par or Stated Value Per Share $ 14.39   $ 14.39 $ 0.01      
Plan Of Reorganization, Percent Of Subscription Rights 97.60%            
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 Financing, Borrowings Outstanding       $ 0 $ 0    
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        
Class A Ordinary Shares, U.S. [Member]              
Restructuring Cost and Reserve [Line Items]              
Common Stock, Par or Stated Value Per Share $ 0.01   $ 0.01   $ 0.40    
Senior Noteholders [Member]              
Restructuring Cost and Reserve [Line Items]              
Plan Of Reorganization, Pro Rata Share Percentage   38.48%          
Plan Of Reorganization, Securities Issued 28,859,900            
Lenders under Revolving Credit Facility Participating in Rights Offering [Member]              
Restructuring Cost and Reserve [Line Items]              
Plan Of Reorganization, Pro Rata Share Percentage   0.70%          
Plan Of Reorganization, Securities Issued 525,000            
Lenders Under Revolving Credit Facility Not Participating in Rights Offering [Member]              
Restructuring Cost and Reserve [Line Items]              
Plan Of Reorganization, Pro Rata Share Percentage   22.98%          
Debtor-in-Possession Financing, Amount Arranged $ 96,100,000   $ 96,100,000        
Plan Of Reorganization, Securities Issued 17,235,000            
Senior Noteholders Who Agreed To Backstop The Rights Offering [Member]              
Restructuring Cost and Reserve [Line Items]              
Plan Of Reorganization, Pro Rata Share Percentage   2.63%          
Debtor-in-Possession Financing, Amount Arranged $ 48,800,000   48,800,000        
Plan Of Reorganization, Securities Issued 1,975,500            
Senior Noteholders Participating In Rights Offering [Member]              
Restructuring Cost and Reserve [Line Items]              
Plan Of Reorganization, Pro Rata Share Percentage   29.30%          
Plan Of Reorganization, Securities Issued 21,975,000            
Lenders Under Revolving Credit Facility Who Agreed to Backstop The Rights Offering [Member]              
Restructuring Cost and Reserve [Line Items]              
Plan Of Reorganization, Pro Rata Share Percentage   0.07%          
Debtor-in-Possession Financing, Amount Arranged $ 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]              
Plan Of Reorganization, Pro Rata Share Percentage   5.30%          
Debtor-in-Possession Financing, Amount Arranged $ 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]              
Debtor-in-Possession Financing, Amount Arranged $ 5,000,000   5,000,000        
Plan Of Reorganization, Securities Issued 375,000            
First Lien Notes | Two RCF Lendors Participating In The Rights Offering              
Restructuring Cost and Reserve [Line Items]              
Plan Of Reorganization, Pro Rata Share Percentage   2.427%          
Senior Notes [Member]              
Restructuring Cost and Reserve [Line Items]              
Debtor-in-Possession Financing, Cash Payment   $ 26,000,000          
Senior Notes [Member] | 6.875% Senior notes due 2020              
Restructuring Cost and Reserve [Line Items]              
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding   6.875%          
Debt Instrument, Face Amount             $ 900,000,000
Senior Notes [Member] | Seven Point Eight Seven Five Percent Senior Notes Due Twenty Forty [Member]              
Restructuring Cost and Reserve [Line Items]              
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding   7.875%          
Senior Notes [Member] | Seven Point Two Zero Percent Debentures Due Twenty Twenty Seven [Member]              
Restructuring Cost and Reserve [Line Items]              
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding   7.20%          
Senior Notes [Member] | Four Point Eight Seven Five Percent Senior Notes Due Twenty Twenty Two [Member]              
Restructuring Cost and Reserve [Line Items]              
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding   4.875%          
Senior Notes [Member] | Four Point Seven Five Percent Senior Notes Due Twenty Twenty Four [Member]              
Restructuring Cost and Reserve [Line Items]              
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding   4.75%          
Senior Notes [Member] | Seven Point Three Seven Five Senior Notes Due Twenty Twenty Five [Member]              
Restructuring Cost and Reserve [Line Items]              
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding   7.375%          
Senior Notes [Member] | Five Point Four Zero Percent Senior Notes Due Twenty Forty Two [Member]              
Restructuring Cost and Reserve [Line Items]              
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding   5.40%          
Senior Notes [Member] | Five Point Eight Five Percent Senior Notes Due Twenty Forty Four [Member]              
Restructuring Cost and Reserve [Line Items]              
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding   5.85%          
Senior Notes [Member] | First Lien Notes              
Restructuring Cost and Reserve [Line Items]              
Debtor-in-Possession Financing, Amount Arranged $ 520,000,000   520,000,000        
Debt Instrument, Face Amount $ 550,000,000   $ 550,000,000        
Senior Notes [Member] | Seven Point Two Zero Debenture Due Twenty Twenty Seven              
Restructuring Cost and Reserve [Line Items]              
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding   7.20%