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Net Sales - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 99.0	$ 76.6	$ 184.2	$ 165.0
General industrial
Disaggregation of Revenue [Line Items]
Net sales	35.6	24.5	63.1	58.4
Transportation
Disaggregation of Revenue [Line Items]
Net sales	28.0	21.1	54.7	45.2
Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Net sales	35.4	31.0	66.4	61.4
Gas Cylinders
Disaggregation of Revenue [Line Items]
Net sales	46.5	37.5	82.7	74.7
Gas Cylinders | General industrial
Disaggregation of Revenue [Line Items]
Net sales	9.9	6.6	15.7	12.8
Gas Cylinders | Transportation
Disaggregation of Revenue [Line Items]
Net sales	16.1	12.5	31.0	25.4
Gas Cylinders | Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Net sales	20.5	18.4	36.0	36.5
Elektron
Disaggregation of Revenue [Line Items]
Net sales	52.5	39.1	101.5	90.3
Elektron | General industrial
Disaggregation of Revenue [Line Items]
Net sales	25.7	17.9	47.4	45.6
Elektron | Transportation
Disaggregation of Revenue [Line Items]
Net sales	11.9	8.6	23.7	19.8
Elektron | Defense, First Response & Healthcare
Disaggregation of Revenue [Line Items]
Net sales	$ 14.9	$ 12.6	$ 30.4	$ 24.9

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