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Restructuring charges - Restructuring and related costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]      
Total restructuring charges $ (6.4) $ (1.9) $ (6.2)
Other restructuring      
Restructuring Cost and Reserve [Line Items]      
Severance costs (3.2) (1.9) (6.2)
Asset impairment charges and non-cash restructuring charges 3.2 0.0 0.0
Total restructuring charges (6.4) (1.9) (6.2)
Gas Cylinders Segment | Other restructuring      
Restructuring Cost and Reserve [Line Items]      
Severance costs (2.9) (1.7) (5.3)
Asset impairment charges and non-cash restructuring charges 3.0 0.0 0.0
Elektron Segment | Other restructuring      
Restructuring Cost and Reserve [Line Items]      
Severance costs (0.3) (0.2) (0.9)
Asset impairment charges and non-cash restructuring charges $ 0.2 $ 0.0 $ 0.0