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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 107.1	$ 129.1	$ 344.0	$ 377.0
General industrial
Disaggregation of Revenue [Line Items]
Net sales	39.1	51.7	122.3	139.5
Transportation
Disaggregation of Revenue [Line Items]
Net sales	32.7	39.1	114.0	112.5
Defense and emergency
Disaggregation of Revenue [Line Items]
Net sales	29.3	30.7	89.4	100.7
Healthcare
Disaggregation of Revenue [Line Items]
Net sales	6.0	7.6	18.3	24.3
Gas Cylinders
Disaggregation of Revenue [Line Items]
Net sales	54.2	62.2	170.7	181.9
Gas Cylinders | General industrial
Disaggregation of Revenue [Line Items]
Net sales	10.1	13.4	34.2	40.2
Gas Cylinders | Transportation
Disaggregation of Revenue [Line Items]
Net sales	20.8	21.0	65.8	57.3
Gas Cylinders | Defense and emergency
Disaggregation of Revenue [Line Items]
Net sales	17.8	20.4	55.2	62.3
Gas Cylinders | Healthcare
Disaggregation of Revenue [Line Items]
Net sales	5.5	7.4	15.5	22.1
Elektron
Disaggregation of Revenue [Line Items]
Net sales	52.9	66.9	173.3	195.1
Elektron | General industrial
Disaggregation of Revenue [Line Items]
Net sales	29.0	38.3	88.1	99.3
Elektron | Transportation
Disaggregation of Revenue [Line Items]
Net sales	11.9	18.1	48.2	55.2
Elektron | Defense and emergency
Disaggregation of Revenue [Line Items]
Net sales	11.5	10.3	34.2	38.4
Elektron | Healthcare
Disaggregation of Revenue [Line Items]
Net sales	$ 0.5	$ 0.2	$ 2.8	$ 2.2

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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