Financial Instruments - Carrying Amount and Estimated Fair Value of Asset (Liability) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 20, 2021	Dec. 31, 2020	Feb. 08, 2019
5.000% Senior Unsecured Notes Due 2029 | Unsecured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate on debt instrument (as a percent)	5.00%	5.00%
6.875% Senior Secured Notes Due 2026 | Unsecured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate on debt instrument (as a percent)				6.875%
6.875% Senior Secured Notes Due 2026 | Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate on debt instrument (as a percent)	6.875%	6.875%	6.875%	6.875%
10.250% Senior Unsecured Notes Due 2027 | Unsecured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate on debt instrument (as a percent)		10.25%	10.25%	10.25%
Carrying amount | Long-term Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure of debt instrument	$ 866.4		$ 847.2
Carrying amount | Revolving facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure of debt instrument	160.0		0.0
Carrying amount | Term Loan Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure of debt instrument	2,718.4		2,433.9
Fair value | Long-term Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure of debt instrument	924.5		1,056.1
Fair value | Revolving facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure of debt instrument	162.7		0.0
Fair value | Term Loan Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure of debt instrument	$ 2,840.7		$ 2,476.2