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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, 2022
Dec. 31, 2021
Finite-lived Intangible Assets [Roll Forward]    
Balance at the beginning of the year $ 23.4 $ 21.7
Additions   1.8
Exchange movements (0.8) (0.1)
Balance at the end of the year 22.6 23.4
Customer relationships    
Finite-lived Intangible Assets [Roll Forward]    
Balance at the beginning of the year 15.2 13.4
Additions   1.8
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 8.2 8.3
Additions   0.0
Exchange movements (0.8) (0.1)
Balance at the end of the year $ 7.4 $ 8.2