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Intangible assets and goodwill - Future Amortization Expense (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]    
2023 $ 71.5  
2024 71.5  
2025 71.5  
2026 70.2  
2027 67.0  
Thereafter 377.1  
Net Carrying Amount $ 728.8 $ 604.6