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Intangible assets and goodwill - Future Amortization Expense (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]    
2024 $ 65.1  
2025 65.1  
2026 63.9  
2027 60.6  
2028 51.7  
Thereafter 260.2  
Net Carrying Amount $ 566.6 $ 728.8