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Chapter 11 Proceedings and Ability to Continue as a Going Concern - Narrative (Details) - USD ($)
 1 Months Ended 3 Months Ended
Feb. 05, 2021
Sep. 25, 2020
Aug. 18, 2020
Aug. 11, 2020
Sep. 14, 2020
Mar. 31, 2021
Restructuring Cost and Reserve [Line Items]            
Amount arranged   $ 500,000,000.0   $ 500,000,000.0    
Support of noteholders 72.00%       72.00%  
Emergence from chapter 11 extension period     60 days      
Financing interest rate on borrowings outstanding, paid-in-kind       8.00%    
Financing interest rate on borrowings outstanding, paid in cash   7.00%        
Maximum cash disbursement   15.00%        
Borrowings outstanding           $ 0
Shares to be allocated     30.00%      
Plan of Reorganization, Support of Revolving Credit Facility, Percentage           100.00%
Backstop commitment agreement, cash settlement     $ 520,000,000      
Contractual interest expense           $ 100,300,000
Backstop commitment agreement, note issued     $ 550,000,000      
Senior Noteholders            
Restructuring Cost and Reserve [Line Items]            
Pro rata share     39.00%      
Amount arranged       $ 550,000,000    
Recovery of claims     100.00%      
Shares to be allocated 2.70%          
Lenders Under The Revolving Credit Facility            
Restructuring Cost and Reserve [Line Items]            
Shares to be allocated 2.427%          
Debtor-in-Possession Financing, Rights Offering     14.00%      
Lenders Under The Revolving Credit Facility | Option One            
Restructuring Cost and Reserve [Line Items]            
Pro rata share     30.80%      
Lenders Under The Revolving Credit Facility | Option Two            
Restructuring Cost and Reserve [Line Items]            
Pro rata share     27.80%      
Senior Noteholders Participating In Rights Offering            
Restructuring Cost and Reserve [Line Items]            
Pro rata share     29.30%      
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      
Holders Of Equity Interests            
Restructuring Cost and Reserve [Line Items]            
Warrants term     7 years      
Warrants for new equity     7.00%      
Lenders under Revolving Credit Facility Participating in Rights Offering            
Restructuring Cost and Reserve [Line Items]            
Pro rata share     0.70%      
Lenders under Revolving Credit Facility Participating in Rights Offering | Option One            
Restructuring Cost and Reserve [Line Items]            
Pro rata share     5.30%      
Cash payment     $ 7,800,000      
Plan of Reorganization, Share Percentage on New Secured Loans     2.40%      
Lenders Under Revolving Credit Facility Not Participating in Rights Offering | Option Two            
Restructuring Cost and Reserve [Line Items]            
Pro rata share     23.00%      
Cash payment     $ 96,100,000      
General Rights Offering            
Restructuring Cost and Reserve [Line Items]            
Pro rata share     97.60%      
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      
Senior Notes            
Restructuring Cost and Reserve [Line Items]            
Cash payment     26,000,000      
Backstop commitment agreement, premium     50,000,000.0      
Backstop commitment fee     $ 20,000,000.0      
Senior Notes | 6.875% Senior notes due 2020            
Restructuring Cost and Reserve [Line Items]            
Interest rate on borrowings outstanding     6.875%      
Senior Notes | 7.875% Senior notes due 2040            
Restructuring Cost and Reserve [Line Items]            
Interest rate on borrowings outstanding     7.875%      
Senior Notes | 4.875% Senior notes due 2022            
Restructuring Cost and Reserve [Line Items]            
Interest rate on borrowings outstanding     4.875%      
Senior Notes | 4.75% Senior notes due 2024            
Restructuring Cost and Reserve [Line Items]            
Interest rate on borrowings outstanding     4.75%      
Senior Notes | 7.375% Senior notes due 2025            
Restructuring Cost and Reserve [Line Items]            
Interest rate on borrowings outstanding     7.375%      
Senior Notes | 5.40% Senior notes due 2042            
Restructuring Cost and Reserve [Line Items]            
Interest rate on borrowings outstanding     5.40%      
Senior Notes | 5.85% Senior notes due 2044            
Restructuring Cost and Reserve [Line Items]            
Interest rate on borrowings outstanding     5.85%      
Senior Notes | First Lien Secured Notes            
Restructuring Cost and Reserve [Line Items]            
Backstop commitment agreement, amount arranged     $ 187,500,000      
Senior Notes | General Rights Offering            
Restructuring Cost and Reserve [Line Items]            
Backstop commitment agreement, amount arranged $ 50,000,000.0   $ 312,500,000      
Senior Notes | 7.20% Debentures due 2027            
Restructuring Cost and Reserve [Line Items]            
Interest rate on borrowings outstanding     7.20%      
Revolving Credit Facility | Option One            
Restructuring Cost and Reserve [Line Items]            
Cash payment     $ 45,000,000.0      
Revolving Credit Facility | Option Two            
Restructuring Cost and Reserve [Line Items]            
Cash payment     $ 116,200,000