v3.25.2
Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 29, 2025
Jun. 30, 2024
Dec. 31, 2024
Cost:      
Beginning balance $ 23.3    
Exchange movements 0.7    
Ending balance 24.0    
Accumulated amortization:      
Beginning balance 11.8    
Provided during the period 0.4 $ 0.4  
Exchange movements 0.4    
Ending balance 12.6    
Net book values: 11.4   $ 11.5
Customer relationships      
Cost:      
Beginning balance 15.6    
Exchange movements 0.0    
Ending balance 15.6    
Accumulated amortization:      
Beginning balance 7.0    
Provided during the period 0.3    
Exchange movements 0.0    
Ending balance 7.3    
Net book values: 8.3   8.6
Technology and trading related      
Cost:      
Beginning balance 7.7    
Exchange movements 0.7    
Ending balance 8.4    
Accumulated amortization:      
Beginning balance 4.8    
Provided during the period 0.1    
Exchange movements 0.4    
Ending balance 5.3    
Net book values: $ 3.1   $ 2.9