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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 120.4	$ 119.7
General industrial
Disaggregation of Revenue [Line Items]
Net sales	43.7	41.4
Transportation
Disaggregation of Revenue [Line Items]
Net sales	40.0	34.1
Defense and emergency
Disaggregation of Revenue [Line Items]
Net sales	29.2	36.8
Healthcare
Disaggregation of Revenue [Line Items]
Net sales	7.5	7.4
Gas Cylinders segment
Disaggregation of Revenue [Line Items]
Net sales	58.4	59.3
Gas Cylinders segment | General industrial
Disaggregation of Revenue [Line Items]
Net sales	13.1	13.0
Gas Cylinders segment | Transportation
Disaggregation of Revenue [Line Items]
Net sales	20.9	16.7
Gas Cylinders segment | Defense and emergency
Disaggregation of Revenue [Line Items]
Net sales	18.7	23.2
Gas Cylinders segment | Healthcare
Disaggregation of Revenue [Line Items]
Net sales	5.7	6.4
Elektron segment
Disaggregation of Revenue [Line Items]
Net sales	62.0	60.4
Elektron segment | General industrial
Disaggregation of Revenue [Line Items]
Net sales	30.6	28.4
Elektron segment | Transportation
Disaggregation of Revenue [Line Items]
Net sales	19.1	17.4
Elektron segment | Defense and emergency
Disaggregation of Revenue [Line Items]
Net sales	10.5	13.6
Elektron segment | Healthcare
Disaggregation of Revenue [Line Items]
Net sales	$ 1.8	$ 1.0

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No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ 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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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