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Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 28, 2025
Sep. 29, 2024
Dec. 31, 2024
Cost:      
Beginning balance $ 23.3    
Exchange movements 0.5    
Ending balance 23.8    
Accumulated amortization:      
Beginning balance 11.8    
Provided during the period 0.6 $ 0.6  
Exchange movements 0.3    
Ending balance 12.7    
Net book values: 11.1   $ 11.5
Customer relationships      
Cost:      
Beginning balance 15.6    
Exchange movements 0.0    
Ending balance 15.6    
Accumulated amortization:      
Beginning balance 7.0    
Provided during the period 0.4    
Exchange movements 0.0    
Ending balance 7.4    
Net book values: 8.2   8.6
Technology and trading related      
Cost:      
Beginning balance 7.7    
Exchange movements 0.5    
Ending balance 8.2    
Accumulated amortization:      
Beginning balance 4.8    
Provided during the period 0.2    
Exchange movements 0.3    
Ending balance 5.3    
Net book values: $ 2.9   $ 2.9