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Emergence from Chapter 11 Bankruptcy (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jul. 01, 2019
Jun. 30, 2019
Subsequent Event [Line Items]            
Rights Offering       $ 100.0    
Debtor reorganization item, equity backstop   $ 24.0   24.0    
Debtor reorganization items, debt backstop   $ 80.0   80.0    
Long-term Debt         $ 1,658.0  
Settlement note       $ 2.5    
shares issued 100   100   58,410,731  
ABL Facility [Domain]            
Subsequent Event [Line Items]            
Due Within One Year $ 0.0   $ 0.0      
13.75% Senior Secured Notes due 2022 [Member]            
Subsequent Event [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage       13.75%    
Debt Instrument, Interest Rate, Stated Percentage       13.75%    
7.875% Senior Secured Notes due 2027 [Domain]            
Subsequent Event [Line Items]            
Due Within One Year $ 0.0   $ 0.0      
Debt Instrument, Interest Rate, Stated Percentage 7.875%   7.875%   7.875%  
Debt Instrument, Interest Rate, Stated Percentage 7.875%   7.875%   7.875%  
DIP Term Loan Facility [Domain]            
Subsequent Event [Line Items]            
Due Within One Year           $ 350.0