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Segmental Information - Financial Information by Reportable Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 30, 2025
Mar. 31, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]      
Depreciation and amortization $ 2.4 $ 2.4  
Total restructuring charges 0.1 0.7  
Total assets 385.2   $ 382.4
Capital expenditures 1.4 1.5  
Discontinued operations      
Segment Reporting Information [Line Items]      
Total assets 8.3   7.7
Capital expenditures 0.0 0.0  
Operating Segments      
Segment Reporting Information [Line Items]      
Depreciation and amortization 0.2 0.2  
Total restructuring charges 0.1 0.7  
Total assets 312.5   310.4
Capital expenditures 1.4 1.5  
Operating Segments | Gas Cylinders      
Segment Reporting Information [Line Items]      
Depreciation and amortization 0.8 0.8  
Total restructuring charges 0.1 0.5  
Total assets 126.2   122.5
Capital expenditures 0.3 0.8  
Operating Segments | Elektron      
Segment Reporting Information [Line Items]      
Depreciation and amortization 1.6 1.6  
Total restructuring charges 0.0 0.2  
Total assets 170.3   173.1
Capital expenditures 1.0 0.7  
Operating Segments | Graphic Arts      
Segment Reporting Information [Line Items]      
Depreciation and amortization 0.0 0.0  
Total restructuring charges 0.0 0.0  
Total assets 16.0   14.8
Capital expenditures 0.1 0.0  
Other      
Segment Reporting Information [Line Items]      
Total assets 64.4   $ 64.3
Capital expenditures $ 0.0 $ 0.0