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Goodwill and other identifiable intangible assets - Schedule of Movements in Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Finite-lived Intangible Assets [Roll Forward]    
Balance at the beginning of the year $ 22.6 $ 23.4
Exchange movements 0.4 (0.8)
Balance at the end of the year 23.0 22.6
Customer relationships    
Finite-lived Intangible Assets [Roll Forward]    
Balance at the beginning of the year 15.2 15.2
Exchange movements 0.0 0.0
Balance at the end of the year 15.2 15.2
Technology and trading related    
Finite-lived Intangible Assets [Roll Forward]    
Balance at the beginning of the year 7.4 8.2
Exchange movements 0.4 (0.8)
Balance at the end of the year $ 7.8 $ 7.4