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Segment Information - Financial Information by Reportable Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Depreciation and amortization $ 9.9 $ 10.1 $ 12.7
Restructuring Charges 9.0 4.7 6.4
Total assets 369.7 382.4  
Capital expenditure 8.0 10.5 9.3
Share-based compensation charges (3.6) (3.5) (2.8)
Discontinued operations      
Segment Reporting Information [Line Items]      
Total assets 5.5 7.7  
Capital expenditure 0.2 0.0 0.1
Share-based compensation charges (0.3) 0.0 0.0
Operating segments      
Segment Reporting Information [Line Items]      
Depreciation and amortization 0.8 0.8 0.8
Total assets 292.8 310.4  
Capital expenditure 7.8 10.5 9.2
Share-based compensation charges (3.6) (3.5) (2.8)
Other segment      
Segment Reporting Information [Line Items]      
Total assets 71.4 64.3  
Capital expenditure 0.0 0.0 0.0
Gas Cylinders Segment | Operating segments      
Segment Reporting Information [Line Items]      
Depreciation and amortization 3.3 3.4 4.1
Restructuring Charges 6.5 4.5 5.9
Total assets 121.8 122.5  
Capital expenditure 1.9 4.8 2.1
Elektron Segment | Operating segments      
Segment Reporting Information [Line Items]      
Depreciation and amortization 6.6 6.7 6.6
Restructuring Charges 2.5 0.2 0.5
Total assets 171.0 173.1  
Capital expenditure 5.8 5.4 6.1
Graphic Arts | Operating segments      
Segment Reporting Information [Line Items]      
Depreciation and amortization 0.0 0.0 2.0
Restructuring Charges 0.0 0.0 0.0
Total assets 0.0 14.8  
Capital expenditure $ 0.1 $ 0.3 $ 1.0