v3.25.2
Segmental Information - Reconciliation of Consolidated Segment Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 29, 2025
Jun. 30, 2024
Jun. 29, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
Net sales $ 104.0 $ 99.7 $ 201.0 $ 189.1
Other cost of sales (80.0) (77.7) (155.6) (148.7)
Amortization (2.5) (2.5) (4.9) (4.9)
Share-based compensation charges (0.9) (0.8) (1.8) (1.4)
Restructuring charges (2.0) (1.1) (2.1) (1.8)
Acquisition and disposal related costs (0.1) (9.2) (0.1) (9.4)
Defined benefit pension credit 0.6 0.2 1.2 0.5
Income before income taxes 7.4 2.7 14.8 6.5
Gas Cylinders        
Segment Reporting Information [Line Items]        
Net sales 47.0 49.8 88.1 95.2
Elektron        
Segment Reporting Information [Line Items]        
Net sales 50.1 42.0 99.5 79.7
Graphic Arts        
Segment Reporting Information [Line Items]        
Net sales 6.9 7.9 13.4 14.2
Operating segments        
Segment Reporting Information [Line Items]        
Net sales 104.0 99.7 201.0 189.1
Manufacturing fixed costs (18.0) (16.5) (34.6) (33.0)
Other cost of sales (62.0) (61.2) (121.0) (115.7)
Other segment items (13.1) (6.9) (25.7) (18.7)
Segment adjusted EBITA 10.9 15.1 19.7 21.7
Amortization (0.2) (0.2) (0.4) (0.4)
Share-based compensation charges (0.9) (0.8) (1.8) (1.4)
Restructuring charges (2.0) (1.1) (2.1) (1.8)
Acquisition and disposal related costs   (9.2) (0.1) (9.4)
Defined benefit pension credit 0.6 0.2 1.2 0.5
Interest expense, net (0.9) (1.3) (1.7) (2.7)
Income before income taxes 7.4 2.7 14.8 6.5
Operating segments | Gas Cylinders        
Segment Reporting Information [Line Items]        
Net sales 47.0 49.8 88.1 95.2
Manufacturing fixed costs (7.6) (7.4) (15.1) (15.0)
Other cost of sales (31.3) (34.1) (59.3) (64.2)
Other segment items (4.1) (4.3) (7.9) (8.7)
Segment adjusted EBITA 4.0 4.0 5.8 7.3
Amortization (0.9) (0.9) (1.7) (1.7)
Restructuring charges (2.0) (1.1) (2.1) (1.6)
Operating segments | Elektron        
Segment Reporting Information [Line Items]        
Net sales 50.1 42.0 99.5 79.7
Manufacturing fixed costs (8.3) (7.3) (15.5) (14.1)
Other cost of sales (26.7) (22.5) (54.2) (42.6)
Other segment items (7.4) (1.2) (14.8) (7.0)
Segment adjusted EBITA 7.7 11.0 15.0 16.0
Amortization (1.6) (1.6) (3.2) (3.2)
Restructuring charges 0.0 0.0 0.0 (0.2)
Operating segments | Graphic Arts        
Segment Reporting Information [Line Items]        
Net sales 6.9 7.9 13.4 14.2
Manufacturing fixed costs (2.1) (1.8) (4.0) (3.9)
Other cost of sales (4.0) (4.6) (7.5) (8.9)
Other segment items (1.6) (1.4) (3.0) (3.0)
Segment adjusted EBITA (0.8) 0.1 (1.1) (1.6)
Amortization 0.0 0.0 0.0 0.0
Restructuring charges 0.0 0.0 0.0 0.0
Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Net sales $ 0.0 $ 0.1 $ 0.1 $ 0.3