Financial Instruments and Risk Management - Summary of Assets By Fair Value Hierarchy (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	$ 5.4
Tax Receivable Agreement	162.0	$ 155.6
Total liabilities	312.2	344.6
Public Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant liabilities		68.5
Private Placement Warrant
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant liabilities	140.0	87.7
Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps	5.4
Interest rate swaps	10.2
Interest Rate Swap | Accrued Expenses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps	10.2
Interest rate swaps		10.3
Interest Rate Swap | Other Long-Term Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps		22.5
Quoted prices in active markets for identical assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps	0.0
Total assets	0.0
Interest rate swaps	0.0
Tax Receivable Agreement	0.0	0.0
Total liabilities	0.0	68.5
Quoted prices in active markets for identical assets (Level 1) | Accrued Expenses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps		0.0
Quoted prices in active markets for identical assets (Level 1) | Other Long-Term Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps		0.0
Quoted prices in active markets for identical assets (Level 1) | Public Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant liabilities		68.5
Quoted prices in active markets for identical assets (Level 1) | Private Placement Warrant
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant liabilities	0.0	0.0
Other observable inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps	5.4
Total assets	5.4
Interest rate swaps	10.2
Tax Receivable Agreement	0.0	0.0
Total liabilities	150.2	120.5
Other observable inputs (Level 2) | Accrued Expenses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps		10.3
Other observable inputs (Level 2) | Other Long-Term Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps		22.5
Other observable inputs (Level 2) | Public Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant liabilities		0.0
Other observable inputs (Level 2) | Private Placement Warrant
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant liabilities	140.0	87.7
Unobservable inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps	0.0
Total assets	0.0
Interest rate swaps	0.0
Tax Receivable Agreement	162.0	155.6
Total liabilities	162.0	155.6
Unobservable inputs (Level 3) | Accrued Expenses
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps		0.0
Unobservable inputs (Level 3) | Other Long-Term Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps		0.0
Unobservable inputs (Level 3) | Public Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant liabilities		0.0
Unobservable inputs (Level 3) | Private Placement Warrant
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant liabilities	$ 0.0	$ 0.0