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Chapter 11 Proceedings and Ability to Continue as a Going Concern - Narrative (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 25, 2020
Aug. 18, 2020
Aug. 11, 2020
Sep. 14, 2020
Sep. 30, 2020
Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]            
Amount arranged $ 500,000,000.0   $ 500,000,000.0      
Support of noteholders       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 $ 0
Shares to be allocated   30.00%        
Backstop commitment agreement, cash settlement   $ 520,000,000        
Backstop commitment agreement, note issued   $ 550,000,000        
Prepetition charges         42,600,000 64,700,000
Contractual interest expense         $ 45,900,000 $ 45,900,000
Senior Noteholders            
Restructuring Cost and Reserve [Line Items]            
Pro rata share   34.80%        
Recovery of claims   100.00%        
Lenders Under The Revolving Credit Facility            
Restructuring Cost and Reserve [Line Items]            
Pro rata share   32.50%        
Senior Noteholders Participating In Rights Offering            
Restructuring Cost and Reserve [Line Items]            
Pro rata share   30.00%        
Senior Noteholder Who Agreed To Backstop The Rights Offering            
Restructuring Cost and Reserve [Line Items]            
Pro rata share   2.70%        
Holders Of Equity Interests            
Restructuring Cost and Reserve [Line Items]            
Pro rata share   0.01%        
Warrants term   7 years        
Warrants for new equity   7.00%        
Senior Notes            
Restructuring Cost and Reserve [Line Items]            
Cash payment   $ 25,000,000        
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   $ 312,500,000