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Restructuring charges - Restructuring and related costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]      
Total restructuring charges $ (4.7) $ (6.4) $ (1.9)
Other restructuring      
Restructuring Cost and Reserve [Line Items]      
Severance costs (1.9) (3.2) (1.9)
Asset impairments (2.8) (3.2) 0.0
Total restructuring charges (4.7) (6.4) (1.9)
Gas Cylinders Segment | Other restructuring      
Restructuring Cost and Reserve [Line Items]      
Severance costs (1.7) (2.9) (1.7)
Asset impairments (2.8) (3.0) 0.0
Elektron Segment | Other restructuring      
Restructuring Cost and Reserve [Line Items]      
Severance costs (0.2) (0.3) (0.2)
Asset impairments $ 0.0 $ (0.2) $ 0.0