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Net sales - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 28, 2021	Mar. 29, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 85.2	$ 88.4
General industrial
Disaggregation of Revenue [Line Items]
Net sales	27.5	33.9
Transportation
Disaggregation of Revenue [Line Items]
Net sales	26.7	24.1
Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Net sales	31.0	30.4
Gas Cylinders segment
Disaggregation of Revenue [Line Items]
Net sales	36.2	37.2
Gas Cylinders segment | General industrial
Disaggregation of Revenue [Line Items]
Net sales	5.8	6.2
Gas Cylinders segment | Transportation
Disaggregation of Revenue [Line Items]
Net sales	14.9	12.9
Gas Cylinders segment | Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Net sales	15.5	18.1
Elektron segment
Disaggregation of Revenue [Line Items]
Net sales	49.0	51.2
Elektron segment | General industrial
Disaggregation of Revenue [Line Items]
Net sales	21.7	27.7
Elektron segment | Transportation
Disaggregation of Revenue [Line Items]
Net sales	11.8	11.2
Elektron segment | Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Net sales	$ 15.5	$ 12.3

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