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Goodwill and other identifiable intangible assets - Schedule of intangible assets (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 29, 2024
Oct. 01, 2023
Dec. 31, 2023
Cost:      
Beginning balance $ 23.0    
Additions 0.4    
Exchange movements 0.3    
Ending balance 23.7    
Accumulated amortization:      
Beginning balance 11.0    
Charge 0.6 $ 0.6  
Exchange movements 0.2    
Ending balance 11.8    
Net book values: 11.9   $ 12.0
Customer relationships      
Cost:      
Beginning balance 15.2    
Additions 0.4    
Exchange movements 0.0    
Ending balance 15.6    
Accumulated amortization:      
Beginning balance 6.6    
Charge 0.3    
Exchange movements 0.0    
Ending balance 6.9    
Net book values: 8.7   8.6
Technology and trading related      
Cost:      
Beginning balance 7.8    
Additions 0.0    
Exchange movements 0.3    
Ending balance 8.1    
Accumulated amortization:      
Beginning balance 4.4    
Charge 0.3    
Exchange movements 0.2    
Ending balance 4.9    
Net book values: $ 3.2   $ 3.4