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Organization and Summary of Accounting Policies - Schedule of Carrying Amount and Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Apr. 11, 2019
Jun. 30, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term debt $ 2,876.8      
Senior secured term loan | Secured Debt | Carrying Amount        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term debt 1,539.4 $ 1,434.1    
Senior secured term loan | Secured Debt | Fair Value | Fair Value, Inputs, Level 2        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term debt $ 1,533.4 1,434.1    
6.750% senior unsecured notes due 2025 | Senior Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Debt instrument, stated rate 6.75%     6.75%
6.750% senior unsecured notes due 2025 | Senior Notes | Carrying Amount        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term debt $ 370.0 370.0    
6.750% senior unsecured notes due 2025 | Senior Notes | Fair Value | Fair Value, Inputs, Level 2        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term debt $ 376.0 368.2    
10.000% senior unsecured notes due 2027 | Senior Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Debt instrument, stated rate 10.00%   10.00%  
10.000% senior unsecured notes due 2027 | Senior Notes | Carrying Amount        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term debt $ 545.0 430.0    
10.000% senior unsecured notes due 2027 | Senior Notes | Fair Value | Fair Value, Inputs, Level 2        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term debt $ 596.8 $ 471.4