Organization and Summary of Accounting Policies - Carrying Amount and Fair Value of Long-Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2020	Jul. 30, 2020	Dec. 31, 2019
Secured Debt | Senior secured term loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 1,543.1		$ 1,434.1
Secured Debt | Senior secured term loan | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	1,543.1		1,434.1
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	1,455.2		1,434.1
Senior Notes | 6.750% senior unsecured notes due 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 370.0		370.0
Stated interest rate	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	363.1		368.2
Senior Notes | 10.000% senior unsecured notes due 2027
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 545.0		430.0
Stated interest rate	10.00%	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		430.0
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	$ 577.0		$ 471.4