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Segmental Information - Financial Information by Reportable Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 26, 2022
Jun. 27, 2021
Jun. 26, 2022
Jun. 27, 2021
Dec. 31, 2021
Segment Reporting Information [Line Items]          
Net sales $ 109.5 $ 99.0 $ 206.5 $ 184.2  
Adjusted EBITDA 16.9 17.3 33.0 35.0  
Depreciation and amortization 3.4 4.0 7.1 7.4  
Restructuring charges 0.3 0.2 1.7 1.6  
Total assets 396.2   396.2   $ 368.8
Capital expenditures 2.0 2.1 3.0 3.6  
Discontinued Operations          
Segment Reporting Information [Line Items]          
Total assets 7.8   7.8   4.8
Capital expenditures 0.0 0.0 0.0  
Gas Cylinders          
Segment Reporting Information [Line Items]          
Net sales 46.1 46.5 88.5 82.7  
Elektron          
Segment Reporting Information [Line Items]          
Net sales 63.4 52.5 118.0 101.5  
Operating Segments | Gas Cylinders          
Segment Reporting Information [Line Items]          
Net sales 46.1 46.5 88.5 82.7  
Adjusted EBITDA 3.7 5.3 6.4 11.3  
Depreciation and amortization 1.2 1.6 2.6 2.5  
Restructuring charges 0.1 0.2 1.5 0.7  
Total assets 138.2   138.2   122.7
Capital expenditures 0.2 0.2 0.4 0.5  
Operating Segments | Elektron          
Segment Reporting Information [Line Items]          
Net sales 63.4 52.5 118.0 101.5  
Adjusted EBITDA 13.2 12.0 26.6 23.7  
Depreciation and amortization 2.2 2.4 4.5 4.9  
Restructuring charges 0.2 0.0 0.2 0.9  
Total assets 217.6   217.6   206.5
Capital expenditures 1.8 1.9 2.6 3.1  
Other          
Segment Reporting Information [Line Items]          
Total assets 32.6   32.6   $ 34.8
Capital expenditures $ 0.0 $ 0.0 $ 0.0