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Goodwill and intangible assets - Schedule of Future Amortization of Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]    
2024 $ 7.2  
2025 4.3  
2026 4.0  
2027 4.0  
2028 4.0  
Thereafter 19.2  
Total $ 42.7 $ 52.4