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Organization and Summary of Accounting Policies - Carrying Amount and Fair Value of Long-Term Debt (Details) - USD ($) $ in Millions | Sep. 30, 2021 | May 03, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Secured Debt | Senior secured term loan | Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-term debt | $ 1,534.5 |  | $ 1,539.4
Secured Debt | Senior secured term loan | Fair Value | Fair Value, Inputs, Level 2 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-term debt | $ 1,523.0 |  | 1,533.4
Senior Notes | 6.750% senior unsecured notes due 2025 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Stated interest rate (percent) | 6.75% | 6.75% |
Senior Notes | 6.750% senior unsecured notes due 2025 | Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-term debt | $ 370.0 |  | 370.0
Senior Notes | 6.750% senior unsecured notes due 2025 | Fair Value | Fair Value, Inputs, Level 2 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-term debt | $ 376.0 |  | 376.0
Senior Notes | 10.000% senior unsecured notes due 2027 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Stated interest rate (percent) | 10.00% |  |
Senior Notes | 10.000% senior unsecured notes due 2027 | Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-term debt | $ 545.0 |  | 545.0
Senior Notes | 10.000% senior unsecured notes due 2027 | Fair Value | Fair Value, Inputs, Level 2 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-term debt | $ 589.3 |  | $ 596.8

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