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Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Millions
 6 Months Ended
Jul. 02, 2023
Jun. 26, 2022
Dec. 31, 2022
Cost:      
Finite-Lived Intangible Assets, Gross $ 23.0   $ 22.6
Finite-Lived Intangible Assets, Foreign Currency Translation Gain (Loss) 0.4    
Accumulated amortization:      
Finite-Lived Intangible Assets, Accumulated Amortization 10.7   10.1
Amortization of purchased intangible assets 0.4 $ 0.4  
Exchange movements 0.2    
Net book values: 12.3   12.5
Customer relationships      
Cost:      
Finite-Lived Intangible Assets, Gross 15.2   15.2
Finite-Lived Intangible Assets, Foreign Currency Translation Gain (Loss) 0.0    
Accumulated amortization:      
Finite-Lived Intangible Assets, Accumulated Amortization 6.3   6.1
Amortization of purchased intangible assets 0.2    
Exchange movements 0.0    
Net book values: 8.9   9.1
Technology and trading related      
Cost:      
Finite-Lived Intangible Assets, Gross 7.8   7.4
Finite-Lived Intangible Assets, Foreign Currency Translation Gain (Loss) 0.4    
Accumulated amortization:      
Finite-Lived Intangible Assets, Accumulated Amortization 4.4   4.0
Amortization of purchased intangible assets 0.2    
Exchange movements 0.2    
Net book values: $ 3.4   $ 3.4