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Segmental Information - Financial Information by Reportable Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 28, 2025
Sep. 29, 2024
Sep. 28, 2025
Sep. 29, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
Amortization $ 2.6 $ 2.6 $ 7.5 $ 7.5  
Restructuring charges 3.5 0.5 5.6 2.3  
Total assets 377.4   377.4   $ 382.4
Capital expenditures 1.7 3.0 4.9 7.3  
Discontinued operations          
Segment Reporting Information [Line Items]          
Total assets 6.8   6.8   7.7
Capital expenditures 0.0 0.0 0.2 0.0  
Operating segments          
Segment Reporting Information [Line Items]          
Amortization 0.2 0.2 0.6 0.6  
Restructuring charges 3.5 0.5 5.6 2.3  
Total assets 301.5   301.5   310.4
Capital expenditures 1.7 3.0 4.7 7.3  
Operating segments | Gas Cylinders          
Segment Reporting Information [Line Items]          
Amortization 0.9 0.9 2.6 2.6  
Restructuring charges 0.9 0.5 3.0 2.1  
Total assets 128.7   128.7   122.5
Capital expenditures 0.5 1.1 1.3 3.2  
Operating segments | Elektron          
Segment Reporting Information [Line Items]          
Amortization 1.7 1.7 4.9 4.9  
Restructuring charges 2.6 0.0 2.6 0.2  
Total assets 172.8   172.8   173.1
Capital expenditures 1.2 1.8 3.3 3.9  
Operating segments | Graphic Arts          
Segment Reporting Information [Line Items]          
Amortization 0.0 0.0 0.0 0.0  
Restructuring charges 0.0 0.0 0.0 0.0  
Total assets 0.0   0.0   14.8
Capital expenditures 0.0 0.1 0.1 0.2  
Other          
Segment Reporting Information [Line Items]          
Total assets 69.1   69.1   $ 64.3
Capital expenditures $ 0.0 $ 0.0 $ 0.0 $ 0.0