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Segmental Information - Financial information by reportable segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 27, 2020
Sep. 29, 2019
Sep. 27, 2020
Sep. 29, 2019
Dec. 31, 2019
Segment Reporting Information [Line Items]          
Net sales $ 90.4 $ 107.1 $ 283.7 $ 344.0  
Adjusted EBITDA 14.2 16.7 39.7 55.4  
Depreciation and amortization 3.6 3.6 10.8 11.3  
Restructuring charges 4.3 2.6 7.9 24.3  
Total assets 359.6   359.6   $ 390.3
Capital expenditures 1.6 0.8 5.1 11.1  
Gas Cylinders segment          
Segment Reporting Information [Line Items]          
Net sales 45.0 54.2 148.0 170.7  
Adjusted EBITDA 7.6 6.3 16.2 17.9  
Depreciation and amortization 1.2 1.3 3.6 4.1  
Restructuring charges 3.4 2.3 6.8 19.5  
Elektron segment          
Segment Reporting Information [Line Items]          
Net sales 45.4 52.9 135.7 173.3  
Adjusted EBITDA 6.6 10.4 23.5 37.5  
Depreciation and amortization 2.4 2.3 7.2 7.2  
Restructuring charges 0.9 0.3 1.0 4.8  
Other          
Segment Reporting Information [Line Items]          
Depreciation and amortization 0.0 0.0 0.0 0.0  
Restructuring charges 0.0 0.0 0.1 0.0  
Operating Segments | Gas Cylinders segment          
Segment Reporting Information [Line Items]          
Total assets 134.5   134.5   156.0
Capital expenditures 0.7 0.5 1.7 2.9  
Operating Segments | Elektron segment          
Segment Reporting Information [Line Items]          
Total assets 190.5   190.5   200.8
Capital expenditures 0.9 0.3 3.4 8.2  
Corporate, Non-Segment          
Segment Reporting Information [Line Items]          
Total assets 34.6   34.6   $ 33.5
Capital expenditures $ 0.0 $ 0.0 $ 0.0 $ 0.0