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Segmental Information - Financial Information by Reportable Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jul. 02, 2023
Jun. 26, 2022
Jul. 02, 2023
Jun. 26, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]          
Net sales $ 110.4 $ 109.5 $ 211.7 $ 206.5  
Adjusted EBITDA 14.4 16.9 25.7 33.0  
Depreciation and amortization 3.3 3.4 6.6 7.1  
Restructuring charges 2.5 0.3 2.8 1.7  
Total assets 415.2   415.2   $ 407.1
Capital expenditures 3.2 2.0 5.1 3.0  
Discontinued operations          
Segment Reporting Information [Line Items]          
Total assets 6.6   6.6   8.1
Capital expenditures 0.2 0.0 0.1 0.0  
Gas Cylinders          
Segment Reporting Information [Line Items]          
Net sales 48.5 46.1 90.0 88.5  
Elektron          
Segment Reporting Information [Line Items]          
Net sales 61.9 63.4 121.7 118.0  
Operating Segments | Gas Cylinders          
Segment Reporting Information [Line Items]          
Net sales 48.5 46.1 90.0 88.5  
Adjusted EBITDA 4.9 3.7 7.4 6.4  
Depreciation and amortization 1.0 1.2 2.1 2.6  
Restructuring charges 2.5 0.1 2.8 1.5  
Total assets 139.6   139.6   133.1
Capital expenditures 0.3 0.2 0.6 0.4  
Operating Segments | Elektron          
Segment Reporting Information [Line Items]          
Net sales 61.9 63.4 121.7 118.0  
Adjusted EBITDA 9.5 13.2 18.3 26.6  
Depreciation and amortization 2.3 2.2 4.5 4.5  
Restructuring charges 0.0 0.2 0.0 0.2  
Total assets 223.9   223.9   216.4
Capital expenditures 2.7 1.8 4.4 2.6  
Other          
Segment Reporting Information [Line Items]          
Total assets 45.1   45.1   $ 49.5
Capital expenditures $ 0.0 $ 0.0 $ 0.0 $ 0.0