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Intangible Assets - Future Amortization (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
Remainder of 2021 $ 7.1  
2022 28.4  
2023 28.4  
2024 26.5  
2025 24.9  
2026 24.9  
Thereafter 132.2  
Total $ 272.4 $ 171.1