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Segmental Information - Financial information by reportable segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 28, 2020
Jun. 30, 2019
Jun. 28, 2020
Jun. 30, 2019
Dec. 31, 2019
Segment Reporting Information [Line Items]          
Net sales $ 89.5 $ 116.5 $ 193.3 $ 236.9  
Adjusted EBITDA 10.4 20.2 25.5 38.7  
Depreciation and amortization 3.6 4.0 7.2 7.7  
Restructuring charges 0.8 12.7 3.6 21.7  
Total assets 369.9   369.9   $ 390.3
Capital expenditures 1.9 3.9 3.5 7.6  
Gas Cylinders segment          
Segment Reporting Information [Line Items]          
Net sales 50.4 58.1 103.0 116.5  
Adjusted EBITDA 5.1 7.1 8.6 11.6  
Depreciation and amortization 1.2 1.4 2.4 2.8  
Restructuring charges 0.8 8.3 3.4 17.2  
Elektron segment          
Segment Reporting Information [Line Items]          
Net sales 39.1 58.4 90.3 120.4  
Adjusted EBITDA 5.3 13.1 16.9 27.1  
Depreciation and amortization 2.4 2.6 4.8 4.9  
Restructuring charges 0.1 4.4 0.1 4.5  
Other          
Segment Reporting Information [Line Items]          
Depreciation and amortization 0.0 0.0 0.0 0.0  
Restructuring charges (0.1) 0.0 0.1 0.0  
Operating Segments | Gas Cylinders segment          
Segment Reporting Information [Line Items]          
Total assets 146.3   146.3   156.0
Capital expenditures 0.5 1.3 1.0 2.4  
Operating Segments | Elektron segment          
Segment Reporting Information [Line Items]          
Total assets 197.3   197.3   200.8
Capital expenditures 1.4 2.6 2.5 5.2  
Corporate, Non-Segment          
Segment Reporting Information [Line Items]          
Total assets 26.3   26.3   $ 33.5
Capital expenditures $ 0.0 $ 0.0 $ 0.0 $ 0.0