Annual report pursuant to Section 13 and 15(d)

Chapter 11 Proceedings - Additional Information (Details)

v3.20.4
Chapter 11 Proceedings - Additional Information (Details)
$ in Millions
12 Months Ended
Feb. 25, 2021
USD ($)
claim
Dec. 31, 2020
USD ($)
Nov. 13, 2020
Debt Instrument [Line Items]      
Debtor-in-possession financing, percentage of lenders involved     95.00%
Holders of an allowed general unsecured claim, percentage of new common stock received   94.00%  
Debtor-in-possession financing, letters of credit outstanding   $ 262.5  
Debtor-in-possession financing, amount arranged   105.0  
Debtor-in-possession financing, borrowings outstanding   157.5  
Contractual interest expense   $ 15.3  
Subsequent Event      
Debt Instrument [Line Items]      
Number of claims | claim 2,200    
Claims amount $ 12,500.0    
6.625% senior unsecured notes due 2023 | Senior notes      
Debt Instrument [Line Items]      
Stated interest rate   6.625%  
6.000% senior unsecured notes due 2024 | Senior notes      
Debt Instrument [Line Items]      
Stated interest rate   6.00%  
6.375% senior unsecured notes due 2025 | Senior notes      
Debt Instrument [Line Items]      
Stated interest rate   6.375%  
6.375% senior unsecured notes due 2026 | Senior notes      
Debt Instrument [Line Items]      
Stated interest rate   6.375%