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Segmental Information - Financial information by reportable segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 27, 2021
Jun. 28, 2020
Jun. 27, 2021
Jun. 28, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]          
Net sales $ 99.0 $ 76.6 $ 184.2 $ 165.0  
Adjusted EBITDA 17.3 10.6 35.0 26.4  
Depreciation and amortization 4.0 3.3 7.4 6.6  
Restructuring charges 0.2 0.8 1.6 3.6  
Total assets 371.7   371.7   $ 346.4
Capital expenditures 2.1 1.9 3.6 3.5  
Discontinued Operations          
Segment Reporting Information [Line Items]          
Total assets 16.4   16.4   32.3
Capital expenditures 0.0 0.0 0.0 0.0  
Gas Cylinders          
Segment Reporting Information [Line Items]          
Net sales 46.5 37.5 82.7 74.7  
Elektron          
Segment Reporting Information [Line Items]          
Net sales 52.5 39.1 101.5 90.3  
Operating Segments | Gas Cylinders          
Segment Reporting Information [Line Items]          
Net sales 46.5 37.5 82.7 74.7  
Adjusted EBITDA 5.3 5.3 11.3 9.5  
Depreciation and amortization 1.6 0.9 2.5 1.8  
Restructuring charges 0.2 0.8 0.7 3.4  
Total assets 125.0   125.0   99.7
Capital expenditures 0.2 0.5 0.5 1.0  
Operating Segments | Elektron          
Segment Reporting Information [Line Items]          
Net sales 52.5 39.1 101.5 90.3  
Adjusted EBITDA 12.0 5.3 23.7 16.9  
Depreciation and amortization 2.4 2.4 4.9 4.8  
Restructuring charges 0.0 0.1 0.9 0.1  
Total assets 197.3   197.3   189.7
Capital expenditures 1.9 1.4 3.1 2.5  
Other          
Segment Reporting Information [Line Items]          
Depreciation and amortization 0.0 0.0 0.0 0.0  
Restructuring charges 0.0 (0.1) 0.0 0.1  
Total assets 33.0   33.0   $ 24.7
Capital expenditures $ 0.0 $ 0.0 $ 0.0 $ 0.0