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Net sales - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 27, 2022	Mar. 28, 2021
Disaggregation of Revenue [Line Items]
Net sales	$ 97.0	$ 85.2
General industrial
Disaggregation of Revenue [Line Items]
Net sales	35.3	27.5
Transportation
Disaggregation of Revenue [Line Items]
Net sales	29.8	26.7
Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Net sales	31.9	31.0
Gas Cylinders
Disaggregation of Revenue [Line Items]
Net sales	42.4	36.2
Gas Cylinders | General industrial
Disaggregation of Revenue [Line Items]
Net sales	8.4	5.8
Gas Cylinders | Transportation
Disaggregation of Revenue [Line Items]
Net sales	16.9	14.9
Gas Cylinders | Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Net sales	17.1	15.5
Elektron
Disaggregation of Revenue [Line Items]
Net sales	54.6	49.0
Elektron | General industrial
Disaggregation of Revenue [Line Items]
Net sales	26.9	21.7
Elektron | Transportation
Disaggregation of Revenue [Line Items]
Net sales	12.9	11.8
Elektron | Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Net sales	$ 14.8	$ 15.5

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