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Segmental Information - Reconciliation of Consolidated Segment Income (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 30, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Net sales $ 97.0 $ 89.4
Cost of goods sold (75.6) (71.0)
Amortization (2.4) (2.4)
Share-based compensation charges (0.9) (0.6)
Restructuring charges (0.1) (0.7)
Acquisition and disposal related costs 0.0 (0.2)
Defined benefit pension credit 0.6 0.3
Income before income taxes 7.4 3.8
Gas Cylinders    
Segment Reporting Information [Line Items]    
Net sales 41.1 45.4
Elektron    
Segment Reporting Information [Line Items]    
Net sales 49.4 37.7
Graphic Arts    
Segment Reporting Information [Line Items]    
Net sales 6.5 6.3
Operating Segments    
Segment Reporting Information [Line Items]    
Net sales 97.0 89.4
Manufacturing fixed costs (16.6) (16.5)
Cost of goods sold (59.0) (54.5)
Other segment items (12.6) (11.8)
Adjusted EBITDA 8.8 6.6
Amortization (0.2) (0.2)
Share-based compensation charges (0.9) (0.6)
Restructuring charges (0.1) (0.7)
Acquisition and disposal related costs   (0.2)
Defined benefit pension credit 0.6 0.3
Interest expense, net (0.8) (1.4)
Income before income taxes 7.4 3.8
Operating Segments | Gas Cylinders    
Segment Reporting Information [Line Items]    
Net sales 41.1 45.4
Manufacturing fixed costs (7.5) (7.6)
Cost of goods sold (28.0) (30.1)
Other segment items (3.8) (4.4)
Adjusted EBITDA 1.8 3.3
Amortization (0.8) (0.8)
Restructuring charges (0.1) (0.5)
Operating Segments | Elektron    
Segment Reporting Information [Line Items]    
Net sales 49.4 37.7
Manufacturing fixed costs (7.2) (6.8)
Cost of goods sold (27.5) (20.1)
Other segment items (7.4) (5.8)
Adjusted EBITDA 7.3 5.0
Amortization (1.6) (1.6)
Restructuring charges 0.0 (0.2)
Operating Segments | Graphic Arts    
Segment Reporting Information [Line Items]    
Net sales 6.5 6.3
Manufacturing fixed costs (1.9) (2.1)
Cost of goods sold (3.5) (4.3)
Other segment items (1.4) (1.6)
Adjusted EBITDA (0.3) (1.7)
Amortization 0.0 0.0
Restructuring charges 0.0 0.0
Intersegment eliminations    
Segment Reporting Information [Line Items]    
Net sales $ 0.1 $ 0.3