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Net Sales - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 91.2	$ 77.7	$ 275.4	$ 242.7
General industrial
Disaggregation of Revenue [Line Items]
Net sales	29.2	26.8	92.3	85.2
Transportation
Disaggregation of Revenue [Line Items]
Net sales	31.1	21.8	85.8	67.0
Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Net sales	30.9	29.1	97.3	90.5
Gas Cylinders
Disaggregation of Revenue [Line Items]
Net sales	45.6	32.3	128.3	107.0
Gas Cylinders | General industrial
Disaggregation of Revenue [Line Items]
Net sales	7.6	6.8	23.3	19.6
Gas Cylinders | Transportation
Disaggregation of Revenue [Line Items]
Net sales	19.7	11.9	50.7	37.3
Gas Cylinders | Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Net sales	18.3	13.6	54.3	50.1
Elektron
Disaggregation of Revenue [Line Items]
Net sales	45.6	45.4	147.1	135.7
Elektron | General industrial
Disaggregation of Revenue [Line Items]
Net sales	21.6	20.0	69.0	65.6
Elektron | Transportation
Disaggregation of Revenue [Line Items]
Net sales	11.4	9.9	35.1	29.7
Elektron | Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Net sales	$ 12.6	$ 15.5	$ 43.0	$ 40.4

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