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Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended
Apr. 02, 2023
Mar. 27, 2022
Dec. 31, 2022
Cost:      
At period start $ 22.6    
Exchange movements 0.2    
At period end 22.8    
Accumulated amortization:      
Accumulated amortization, beginning balance 10.1    
Amortization of purchased intangible assets 0.2 $ 0.2  
Exchange movements 0.1    
Accumulated amortization, ending balance 10.4    
Net book values: 12.4   $ 12.5
Customer relationships      
Cost:      
At period start 15.2    
Exchange movements 0.0    
At period end 15.2    
Accumulated amortization:      
Accumulated amortization, beginning balance 6.1    
Amortization of purchased intangible assets 0.1    
Exchange movements 0.0    
Accumulated amortization, ending balance 6.2    
Net book values: 9.0   9.1
Technology and trading related      
Cost:      
At period start 7.4    
Exchange movements 0.2    
At period end 7.6    
Accumulated amortization:      
Accumulated amortization, beginning balance 4.0    
Amortization of purchased intangible assets 0.1    
Exchange movements 0.1    
Accumulated amortization, ending balance 4.2    
Net book values: $ 3.4   $ 3.4