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Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 26, 2022
Jun. 27, 2021
Dec. 31, 2021
Cost:      
At period start $ 23.4    
Exchange movements (0.6)    
At period end 22.8    
Accumulated amortization:      
Accumulated amortization, beginning balance 9.7    
Amortization of purchased intangible assets 0.4 $ 0.4  
Exchange movements (0.3)    
Accumulated amortization, ending balance 9.8    
Net book values: 13.0   $ 13.7
Customer relationships      
Cost:      
At period start 15.2    
Exchange movements 0.0    
At period end 15.2    
Accumulated amortization:      
Accumulated amortization, beginning balance 5.7    
Amortization of purchased intangible assets 0.2    
Exchange movements 0.0    
Accumulated amortization, ending balance 5.9    
Net book values: 9.3   9.5
Technology and trading related      
Cost:      
At period start 8.2    
Exchange movements (0.6)    
At period end 7.6    
Accumulated amortization:      
Accumulated amortization, beginning balance 4.0    
Amortization of purchased intangible assets 0.2    
Exchange movements (0.3)    
Accumulated amortization, ending balance 3.9    
Net book values: $ 3.7   $ 4.2