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Segment Information - Financial Information by Reportable Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Depreciation and amortization $ 10.1 $ 12.7 $ 13.6
Restructuring Charges 4.7 6.4 1.9
Total assets 382.4 372.1  
Capital expenditure 10.5 9.3 8.6
Share-based compensation charges (3.5) (2.8) (2.5)
Discontinued operations      
Segment Reporting Information [Line Items]      
Total assets 7.7 7.8  
Capital expenditure 0.0 0.1 0.0
Operating segments      
Segment Reporting Information [Line Items]      
Depreciation and amortization 0.8 0.8 0.7
Total assets 310.4 313.0  
Capital expenditure 10.5 9.2 8.6
Share-based compensation charges (3.5) (2.8) (2.5)
Other segment      
Segment Reporting Information [Line Items]      
Total assets 64.3 51.3  
Capital expenditure 0.0 0.0 0.0
Gas Cylinders Segment | Operating segments      
Segment Reporting Information [Line Items]      
Depreciation and amortization 3.4 4.1 4.8
Restructuring Charges 4.5 5.9 1.7
Total assets 122.5 131.0  
Capital expenditure 4.8 2.1 1.2
Elektron Segment | Operating segments      
Segment Reporting Information [Line Items]      
Depreciation and amortization 6.7 6.6 6.6
Restructuring Charges 0.2 0.5 0.2
Total assets 173.1 162.4  
Capital expenditure 5.4 6.1 6.7
Graphic Arts | Operating segments      
Segment Reporting Information [Line Items]      
Depreciation and amortization 0.0 2.0 2.2
Restructuring Charges 0.0 0.0 0.0
Total assets 14.8 19.6  
Capital expenditure $ 0.3 $ 1.0 $ 0.7