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Net Sales - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 90.4	$ 107.1	$ 283.7	$ 344.0
General industrial
Disaggregation of Revenue [Line Items]
Net sales	31.5	39.1	99.9	122.3
Transportation
Disaggregation of Revenue [Line Items]
Net sales	26.4	32.7	83.6	114.0
Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Net sales	32.5	35.3	100.2	107.7
Gas Cylinders segment
Disaggregation of Revenue [Line Items]
Net sales	45.0	54.2	148.0	170.7
Gas Cylinders segment | General industrial
Disaggregation of Revenue [Line Items]
Net sales	11.5	10.1	34.3	34.2
Gas Cylinders segment | Transportation
Disaggregation of Revenue [Line Items]
Net sales	16.5	20.8	53.9	65.8
Gas Cylinders segment | Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Net sales	17.0	23.3	59.8	70.7
Elektron segment
Disaggregation of Revenue [Line Items]
Net sales	45.4	52.9	135.7	173.3
Elektron segment | General industrial
Disaggregation of Revenue [Line Items]
Net sales	20.0	29.0	65.6	88.1
Elektron segment | Transportation
Disaggregation of Revenue [Line Items]
Net sales	9.9	11.9	29.7	48.2
Elektron segment | Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Net sales	$ 15.5	$ 12.0	$ 40.4	$ 37.0

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