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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 |  |

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