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Revenue - Disaggregation of Revenue (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
Disaggregation of Revenue [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
General industrial
Disaggregation of Revenue [Line Items]
Net sales									111.9	136.4	151.9
Transportation
Disaggregation of Revenue [Line Items]
Net sales									92.1	108.0	105.9
Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Net sales									120.8	129.0	144.1
Gas Cylinders segment
Disaggregation of Revenue [Line Items]
Net sales									141.9	153.5	152.1
Gas Cylinders segment | General industrial
Disaggregation of Revenue [Line Items]
Net sales									24.2	24.7	28.0
Gas Cylinders segment | Transportation
Disaggregation of Revenue [Line Items]
Net sales									49.8	48.5	33.1
Gas Cylinders segment | Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Net sales									67.9	80.3	91.0
Elektron segment
Disaggregation of Revenue [Line Items]
Net sales									182.9	219.9	249.8
Elektron segment | General industrial
Disaggregation of Revenue [Line Items]
Net sales									87.7	111.7	123.9
Elektron segment | Transportation
Disaggregation of Revenue [Line Items]
Net sales									42.3	59.5	72.8
Elektron segment | Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Net sales									$ 52.9	$ 48.7	$ 53.1

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