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Segmental Information - Financial information by reportable segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 28, 2021
Mar. 29, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Net sales $ 85.2 $ 88.4  
Adjusted EBITDA 17.7 15.8  
Depreciation and amortization 3.4 3.3  
Restructuring charges 1.4 2.8  
Total assets 388.4 346.4 $ 346.4
Capital expenditures 1.5 1.6  
Discontinued Operations      
Segment Reporting Information [Line Items]      
Total assets 17.0 32.3  
Capital expenditures 0.0 0.0  
Gas Cylinders segment      
Segment Reporting Information [Line Items]      
Net sales 36.2 37.2  
Adjusted EBITDA 6.0 4.2  
Depreciation and amortization 0.9 0.9  
Restructuring charges 0.5 2.6  
Elektron segment      
Segment Reporting Information [Line Items]      
Net sales 49.0 51.2  
Adjusted EBITDA 11.7 11.6  
Depreciation and amortization 2.5 2.4  
Restructuring charges 0.9 0.0  
Other      
Segment Reporting Information [Line Items]      
Depreciation and amortization 0.0 0.0  
Restructuring charges 0.0 0.2  
Operating Segments | Gas Cylinders segment      
Segment Reporting Information [Line Items]      
Total assets 122.5 99.7  
Capital expenditures 0.3 0.5  
Operating Segments | Elektron segment      
Segment Reporting Information [Line Items]      
Total assets 197.2 189.7  
Capital expenditures 1.2 1.1  
Corporate, Non-Segment      
Segment Reporting Information [Line Items]      
Total assets 51.7 24.7  
Capital expenditures $ 0.0 $ 0.0