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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, 2025
Dec. 31, 2024
Finite-lived Intangible Assets [Roll Forward]    
Balance at the beginning of the year $ 23.3 $ 23.0
Additions   0.4
Exchange movements 0.5 (0.1)
Balance at the end of the year 23.8 23.3
Customer relationships    
Finite-lived Intangible Assets [Roll Forward]    
Balance at the beginning of the year 15.6 15.2
Additions   0.4
Exchange movements 0.0 0.0
Balance at the end of the year 15.6 15.6
Technology and trading related    
Finite-lived Intangible Assets [Roll Forward]    
Balance at the beginning of the year 7.7 7.8
Additions   0.0
Exchange movements 0.5 (0.1)
Balance at the end of the year $ 8.2 $ 7.7