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Restructuring - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 6.2 $ 8.9 $ 25.9
Severance costs   1.4  
Gas Cylinders Segment      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 5.0 7.5 20.1
Environmental remediation charge 1.0    
Employee litigation claims 2.4    
Restructuring charges 5.3 7.9 20.7
Severance costs   0.4  
Gas Cylinders Segment | Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 0.3    
Elektron Segment      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 0.9 0.9 5.2
Severance costs   0.9  
Asset write down and one time employee benefits     4.6
Elektron Segment | One-time termination benefits      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 0.9    
Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 0.0 0.1 0.0
Severance costs   $ 0.1  
Gas Cylinders and Elektron segments      
Restructuring Cost and Reserve [Line Items]      
Other restructuring costs     $ 1.2