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Segment Information - Financial Information by Reportable Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Net Sales $ 405.0 $ 423.4 $ 374.1
Adjusted EBITDA 38.8 63.1 63.4
Depreciation and amortization 12.7 13.6 15.6
Restructuring Charges 6.4 1.9 6.2
Total assets 372.1 407.1  
Capital expenditure 9.3 8.6 9.0
Discontinued operations      
Segment Reporting Information [Line Items]      
Total assets 7.8 8.1  
Capital expenditure 0.1 0.0 0.1
Intersegment eliminations      
Segment Reporting Information [Line Items]      
Net Sales 0.7 0.4 0.0
Other segment      
Segment Reporting Information [Line Items]      
Total assets 51.3 49.5  
Capital expenditure 0.0 0.0 0.0
Gas Cylinders Segment      
Segment Reporting Information [Line Items]      
Net Sales 186.4 183.7 178.3
Gas Cylinders Segment | Operating segments      
Segment Reporting Information [Line Items]      
Net Sales 186.4 183.7 178.3
Adjusted EBITDA 16.7 12.8 22.7
Depreciation and amortization 4.1 4.8 5.8
Restructuring Charges 5.9 1.7 5.3
Total assets 131.0 133.1  
Capital expenditure 2.1 1.2 1.0
Elektron Segment      
Segment Reporting Information [Line Items]      
Net Sales 187.1 201.0 155.7
Elektron Segment | Operating segments      
Segment Reporting Information [Line Items]      
Net Sales 187.1 201.0 155.7
Adjusted EBITDA 26.6 42.5 34.1
Depreciation and amortization 6.6 6.6 7.4
Restructuring Charges 0.5 0.2 0.9
Total assets 162.4 172.5  
Capital expenditure 6.1 6.7 6.9
Graphic Arts      
Segment Reporting Information [Line Items]      
Net Sales 31.5 38.7 40.1
Graphic Arts | Operating segments      
Segment Reporting Information [Line Items]      
Net Sales 31.5 38.7 40.1
Adjusted EBITDA (4.5) 7.8 6.6
Depreciation and amortization 2.0 2.2 2.4
Restructuring Charges 0.0 0.0 0.0
Total assets 19.6 43.9  
Capital expenditure $ 1.0 $ 0.7 $ 1.0