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Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 30, 2025
Mar. 31, 2024
Dec. 31, 2024
Cost:      
At period start $ 23.3    
Exchange movements 0.2    
At period end 23.5    
Accumulated amortization:      
Accumulated amortization, beginning balance 11.8    
Amortization of purchased intangible assets 0.2 $ 0.2  
Exchange movements 0.1    
Accumulated amortization, ending balance 12.1    
Net book values: 11.4   $ 11.5
Customer relationships      
Cost:      
At period start 15.6    
Exchange movements 0.0    
At period end 15.6    
Accumulated amortization:      
Accumulated amortization, beginning balance 7.0    
Amortization of purchased intangible assets 0.1    
Exchange movements 0.0    
Accumulated amortization, ending balance 7.1    
Net book values: 8.5   8.6
Technology and trading related      
Cost:      
At period start 7.7    
Exchange movements 0.2    
At period end 7.9    
Accumulated amortization:      
Accumulated amortization, beginning balance 4.8    
Amortization of purchased intangible assets 0.1    
Exchange movements 0.1    
Accumulated amortization, ending balance 5.0    
Net book values: $ 2.9   $ 2.9