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Goodwill and other identifiable intangible assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jul. 02, 2023
Dec. 31, 2023
Cost:      
Beginning balance $ 23.0    
Ending balance 23.0    
Accumulated amortization:      
Beginning balance 11.0    
Charge 0.4 $ 0.4  
Ending balance 11.4    
Net book values: 11.6   $ 12.0
Customer relationships      
Cost:      
Beginning balance 15.2    
Ending balance 15.2    
Accumulated amortization:      
Beginning balance 6.6    
Charge 0.2    
Ending balance 6.8    
Net book values: 8.4   8.6
Technology and trading related      
Cost:      
Beginning balance 7.8    
Ending balance 7.8    
Accumulated amortization:      
Beginning balance 4.4    
Charge 0.2    
Ending balance 4.6    
Net book values: $ 3.2   $ 3.4