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Intangible assets and goodwill - Future Amortization Expense (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
2022 $ 55.9  
2023 55.8  
2024 55.8  
2025 55.8  
2026 381.3  
Net $ 604.6 $ 663.1