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Goodwill and other identifiable intangible assets - Schedule of Goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Goodwill [Roll Forward]    
Beginning balance $ 67.5 $ 65.6
Exchange difference (0.5) 1.9
Ending balance 67.0 67.5
Gas Cylinders    
Goodwill [Roll Forward]    
Beginning balance 26.2 25.0
Exchange difference (0.3) 1.2
Ending balance 25.9 26.2
Elektron    
Goodwill [Roll Forward]    
Beginning balance 41.3 40.6
Exchange difference (0.2) 0.7
Ending balance $ 41.1 $ 41.3