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Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 27, 2022
Mar. 28, 2021
Dec. 31, 2021
Finite-Lived Intangible Assets      
Beginning balance $ 23.4    
Exchange movements (0.1)    
Ending balance 23.3    
Accumulated amortization, beginning balance 9.7    
Amortization of purchased intangible assets 0.2 $ 0.2  
Accumulated amortization, ending balance 9.9    
Net book value 13.4   $ 13.7
Customer relationships      
Finite-Lived Intangible Assets      
Beginning balance 15.2    
Exchange movements 0.0    
Ending balance 15.2    
Accumulated amortization, beginning balance 5.7    
Amortization of purchased intangible assets 0.1    
Accumulated amortization, ending balance 5.8    
Net book value 9.4   9.5
Technology and trading related      
Finite-Lived Intangible Assets      
Beginning balance 8.2    
Exchange movements (0.1)    
Ending balance 8.1    
Accumulated amortization, beginning balance 4.0    
Amortization of purchased intangible assets 0.1    
Accumulated amortization, ending balance 4.1    
Net book value $ 4.0   $ 4.2