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Segmental Information - Financial Information by Reportable Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Apr. 02, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Net sales $ 89.4 $ 101.3  
Adjusted EBITDA 8.8 11.3  
Depreciation and amortization 2.4 3.3  
Restructuring charges 0.7 0.3  
Total assets 386.0   $ 372.1
Capital expenditures 1.5 1.9  
Discontinued operations      
Segment Reporting Information [Line Items]      
Total assets 7.6   7.8
Capital expenditures 0.0 (0.1)  
Gas Cylinders      
Segment Reporting Information [Line Items]      
Net sales 45.4 41.5  
Elektron      
Segment Reporting Information [Line Items]      
Net sales 37.7 52.4  
Graphic Arts      
Segment Reporting Information [Line Items]      
Net sales 6.3 7.4  
Operating Segments | Gas Cylinders      
Segment Reporting Information [Line Items]      
Net sales 45.4 41.5  
Adjusted EBITDA 4.1 2.5  
Depreciation and amortization 0.8 1.1  
Restructuring charges 0.5 0.3  
Total assets 137.8   131.0
Capital expenditures 0.8 0.3  
Operating Segments | Elektron      
Segment Reporting Information [Line Items]      
Net sales 37.7 52.4  
Adjusted EBITDA 6.4 9.5  
Depreciation and amortization 1.6 1.7  
Restructuring charges 0.2 0.0  
Total assets 167.3   162.4
Capital expenditures 0.7 1.6  
Operating Segments | Graphic Arts      
Segment Reporting Information [Line Items]      
Net sales 6.3 7.4  
Adjusted EBITDA (1.7) (0.7)  
Depreciation and amortization 0.0 0.5  
Restructuring charges 0.0 0.0  
Total assets 19.0   19.6
Capital expenditures 0.0 0.1  
Other      
Segment Reporting Information [Line Items]      
Total assets 54.3   $ 51.3
Capital expenditures $ 0.0 $ 0.0