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Segmental Information - Financial Information by Reportable Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Oct. 01, 2023
Sep. 25, 2022
Oct. 01, 2023
Sep. 25, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]          
Net sales $ 97.4 $ 100.2 $ 309.1 $ 306.7  
Adjusted EBITDA 6.0 16.1 31.7 49.1  
Depreciation and amortization 3.2 3.3 9.8 10.4  
Restructuring charges 1.6 0.3 4.4 2.0  
Total assets 392.9   392.9   $ 407.1
Capital expenditures 2.5 2.5 7.6 5.5  
Discontinued operations          
Segment Reporting Information [Line Items]          
Total assets 7.9   7.9   8.1
Capital expenditures 0.0 0.0 0.1 0.0  
Gas Cylinders segment          
Segment Reporting Information [Line Items]          
Net sales 44.7 43.4 134.7 131.9  
Elektron segment          
Segment Reporting Information [Line Items]          
Net sales 52.7 56.8 174.4 174.8  
Operating segments | Gas Cylinders segment          
Segment Reporting Information [Line Items]          
Net sales 44.7 43.4 134.7 131.9  
Adjusted EBITDA 2.8 3.4 10.2 9.8  
Depreciation and amortization 1.1 1.2 3.2 3.8  
Restructuring charges 1.4 0.3 4.1 1.8  
Total assets 135.3   135.3   133.1
Capital expenditures 0.8 0.4 1.4 0.8  
Operating segments | Elektron segment          
Segment Reporting Information [Line Items]          
Net sales 52.7 56.8 174.4 174.8  
Adjusted EBITDA 3.2 12.7 21.5 39.3  
Depreciation and amortization 2.1 2.1 6.6 6.6  
Restructuring charges 0.2 0.0 0.3 0.2  
Total assets 208.6   208.6   216.4
Capital expenditures 1.7 2.1 6.1 4.7  
Other          
Segment Reporting Information [Line Items]          
Total assets 41.1   41.1   $ 49.5
Capital expenditures $ 0.0 $ 0.0 $ 0.0 $ 0.0