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Segmental Information - Financial Information by Reportable Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 27, 2020
Jun. 28, 2020
Mar. 29, 2020
Dec. 31, 2019
Sep. 29, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]                      
Net Sales $ 82.1 $ 77.7 $ 76.6 $ 88.4 $ 82.3 $ 90.8 $ 98.0 $ 102.3 $ 324.8 $ 373.4 $ 401.9
Adjusted EBITDA                 53.9 67.1 79.6
Depreciation and amortization                 13.3 13.2 16.9
Restructuring charges                 8.9 25.9 13.2
Total assets 346.4       390.3       346.4 390.3  
Capital expenditure                 7.4 14.8 13.6
Discontinued operations                      
Segment Reporting Information [Line Items]                      
Total assets 32.3       42.9       32.3 42.9  
Capital expenditure                 0.3 0.8 0.7
Intersegment Revenues Between Elektron Segment and Gas Cylinders Segment                      
Segment Reporting Information [Line Items]                      
Net Sales                 0.4 0.4 0.4
Gas Cylinders segment                      
Segment Reporting Information [Line Items]                      
Net Sales                 141.9 153.5 152.1
Adjusted EBITDA                 21.3 22.3 23.4
Depreciation and amortization                 3.7 3.6 5.2
Restructuring charges                 7.9 20.7 9.8
Elektron segment                      
Segment Reporting Information [Line Items]                      
Net Sales                 182.9 219.9 249.8
Adjusted EBITDA                 32.6 44.8 56.2
Depreciation and amortization                 9.6 9.6 11.7
Restructuring charges                 0.9 5.2 3.4
Other                      
Segment Reporting Information [Line Items]                      
Depreciation and amortization                 0.0 0.0 0.0
Restructuring charges                 0.1 0.0 0.0
Operating Segments | Gas Cylinders segment                      
Segment Reporting Information [Line Items]                      
Total assets 99.7       113.1       99.7 113.1  
Capital expenditure                 2.0 3.1 2.1
Operating Segments | Elektron segment                      
Segment Reporting Information [Line Items]                      
Total assets 189.7       200.8       189.7 200.8  
Capital expenditure                 5.1 10.9 10.5
Other                      
Segment Reporting Information [Line Items]                      
Total assets $ 24.7       $ 33.5       24.7 33.5  
Capital expenditure                 $ 0.0 $ 0.0 $ 0.3