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Restructuring - Restructuring Charges (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]      
Total restructuring charges $ (25.9) $ (13.4) $ (8.4)
Gas Cylinders segment      
Restructuring Cost and Reserve [Line Items]      
Total restructuring charges (20.7) (10.0) (2.9)
Elektron segment      
Restructuring Cost and Reserve [Line Items]      
Total restructuring charges (5.2) (3.4) (5.5)
Severance and related costs      
Restructuring Cost and Reserve [Line Items]      
Total restructuring charges (20.9) (6.7) (4.6)
Asset impairment      
Restructuring Cost and Reserve [Line Items]      
Total restructuring charges (5.0) (6.8) (2.3)
Other      
Restructuring Cost and Reserve [Line Items]      
Total restructuring charges $ 0.0 $ 0.1 $ (1.5)