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Segment Information - Reconciliation of Consolidated Segment Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Net sales $ 384.6 $ 391.9 $ 405.0
Cost of sales (295.4) (306.2) (328.4)
Segment adjusted EBITA   45.2 26.9
Amortization (9.9) (10.1) (12.7)
Share-based compensation charges (3.6) (3.5) (2.8)
Restructuring charges (9.0) (4.7) (6.4)
Loss on held-for-sale asset group 0.0 6.1 0.0
Impairment charges 0.0 0.0 (12.7)
Disposal related costs (2.0) (12.2) 0.0
Defined benefit pension credit 1.3 1.6 (7.6)
Income / (loss) before income taxes 22.2 26.5 (9.7)
Gas Cylinders Segment      
Segment Reporting Information [Line Items]      
Net sales 174.8 186.3 186.4
Elektron Segment      
Segment Reporting Information [Line Items]      
Net sales 196.4 176.0 187.1
Graphic Arts      
Segment Reporting Information [Line Items]      
Net sales 13.4 29.6 31.5
Operating segments      
Segment Reporting Information [Line Items]      
Net sales 384.6    
Manufacturing fixed costs (65.9) (64.8) (69.4)
Cost of sales (229.5) (241.4) (259.0)
Other segment items (49.0) (40.5) (49.7)
Segment adjusted EBITA 40.2    
Amortization (0.8) (0.8) (0.8)
Share-based compensation charges (3.6) (3.5) (2.8)
Restructuring charges (9.0) (4.7) (6.4)
Disposal related costs (2.0)    
Defined benefit pension credit 1.3 1.6 (7.6)
Interest expense, net (3.1) (5.2) (6.3)
Income / (loss) before income taxes 22.2 26.5 (9.7)
Operating segments | Gas Cylinders Segment      
Segment Reporting Information [Line Items]      
Net sales 174.8 186.3 186.4
Manufacturing fixed costs (29.4) (28.7) (29.1)
Cost of sales (117.2) (127.4) (129.8)
Other segment items (16.5) (15.6) (14.9)
Segment adjusted EBITA 11.7 14.6 12.6
Amortization (3.3) (3.4) (4.1)
Operating segments | Elektron Segment      
Segment Reporting Information [Line Items]      
Net sales 196.4 176.0 187.1
Manufacturing fixed costs (32.5) (28.4) (29.4)
Cost of sales (104.9) (95.6) (107.9)
Other segment items (27.9) (18.5) (29.0)
Segment adjusted EBITA 31.1 33.5 20.8
Amortization (6.6) (6.7) (6.6)
Operating segments | Graphic Arts      
Segment Reporting Information [Line Items]      
Net sales 13.4 29.6 31.5
Manufacturing fixed costs (4.0) (7.7) (10.9)
Cost of sales (7.4) (18.4) (21.3)
Other segment items (4.6) (6.4) (5.8)
Segment adjusted EBITA (2.6) (2.9) (6.5)
Amortization 0.0 0.0 (2.0)
Intersegment eliminations      
Segment Reporting Information [Line Items]      
Net sales $ 0.1 $ 0.7 $ 0.7