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Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Apr. 02, 2023
Dec. 31, 2023
Cost:      
At period start $ 23.0    
Exchange movements (0.1)    
At period end 22.9    
Accumulated amortization:      
Accumulated amortization, beginning balance 11.0    
Amortization of purchased intangible assets 0.2 $ 0.2  
Exchange movements (0.1)    
Accumulated amortization, ending balance 11.1    
Net book values: 11.8   $ 12.0
Customer relationships      
Cost:      
At period start 15.2    
Exchange movements 0.0    
At period end 15.2    
Accumulated amortization:      
Accumulated amortization, beginning balance 6.6    
Amortization of purchased intangible assets 0.1    
Exchange movements 0.0    
Accumulated amortization, ending balance 6.7    
Net book values: 8.5   8.6
Technology and trading related      
Cost:      
At period start 7.8    
Exchange movements (0.1)    
At period end 7.7    
Accumulated amortization:      
Accumulated amortization, beginning balance 4.4    
Amortization of purchased intangible assets 0.1    
Exchange movements (0.1)    
Accumulated amortization, ending balance 4.4    
Net book values: $ 3.3   $ 3.4