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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, 2021
Dec. 31, 2020
Finite-lived Intangible Assets [Roll Forward]    
Balance at the beginning of the year $ 21.7 $ 21.5
Additions 1.8  
Exchange movements (0.1) 0.2
Balance at the end of the year 23.4 21.7
Customer relationships    
Finite-lived Intangible Assets [Roll Forward]    
Balance at the beginning of the year 13.4 13.4
Additions 1.8  
Exchange movements 0.0 0.0
Balance at the end of the year 15.2 13.4
Technology and trading related    
Finite-lived Intangible Assets [Roll Forward]    
Balance at the beginning of the year 8.3 8.1
Additions 0.0  
Exchange movements (0.1) 0.2
Balance at the end of the year $ 8.2 $ 8.3