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Goodwill and other identifiable intangible assets - Schedule of Goodwill (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Goodwill [Roll Forward]    
Beginning balance $ 67.0 $ 67.5
Exchange difference 2.6 (0.5)
Ending balance 69.6 67.0
Gas Cylinders    
Goodwill [Roll Forward]    
Beginning balance 25.9 26.2
Exchange difference 1.6 (0.3)
Ending balance 27.5 25.9
Elektron    
Goodwill [Roll Forward]    
Beginning balance 41.1 41.3
Exchange difference 1.0 (0.2)
Ending balance $ 42.1 $ 41.1