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Segmental Information - Financial Information by Reportable Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 25, 2022
Sep. 26, 2021
Sep. 25, 2022
Sep. 26, 2021
Dec. 31, 2021
Segment Reporting Information [Line Items]          
Net sales $ 100.2 $ 91.2 $ 306.7 $ 275.4  
Adjusted EBITDA 16.1 13.8 49.1 48.8  
Depreciation and amortization 3.3 3.8 10.4 11.2  
Restructuring charges 0.3 0.5 2.0 2.1  
Total assets 392.4   392.4   $ 368.8
Capital expenditures 2.5 2.0 5.5 5.6  
Discontinued operations          
Segment Reporting Information [Line Items]          
Total assets 7.9   7.9   4.8
Capital expenditures 0.0 0.0 0.0 0.0  
Gas Cylinders          
Segment Reporting Information [Line Items]          
Net sales 43.4 45.6 131.9 128.3  
Elektron          
Segment Reporting Information [Line Items]          
Net sales 56.8 45.6 174.8 147.1  
Operating Segments | Gas Cylinders          
Segment Reporting Information [Line Items]          
Net sales 43.4 45.6 131.9 128.3  
Adjusted EBITDA 3.4 5.4 9.8 16.7  
Depreciation and amortization 1.2 1.4 3.8 3.9  
Restructuring charges 0.3 0.5 1.8 1.1  
Total assets 131.0   131.0   122.7
Capital expenditures 0.4 0.2 0.8 0.7  
Operating Segments | Elektron          
Segment Reporting Information [Line Items]          
Net sales 56.8 45.6 174.8 147.1  
Adjusted EBITDA 12.7 8.4 39.3 32.1  
Depreciation and amortization 2.1 2.4 6.6 7.3  
Restructuring charges 0.0 0.0 0.2 1.0  
Total assets 213.1   213.1   206.5
Capital expenditures 2.1 1.8 4.7 4.9  
Other          
Segment Reporting Information [Line Items]          
Total assets 40.4   40.4   $ 34.8
Capital expenditures $ 0.0 $ 0.0 $ 0.0 $ 0.0