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Goodwill and other identifiable intangible assets - Schedule of Goodwill (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Goodwill [Roll Forward]  
Beginning balance $ 67.6
Exchange difference 0.8
Ending balance 68.4
Gas Cylinders  
Goodwill [Roll Forward]  
Beginning balance 26.3
Exchange difference 0.5
Ending balance 26.8
Elektron  
Goodwill [Roll Forward]  
Beginning balance 41.3
Exchange difference 0.3
Ending balance $ 41.6