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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 116.5	$ 128.2	$ 236.9	$ 247.9
General industrial
Disaggregation of Revenue [Line Items]
Net sales	39.5	46.4	83.2	87.8
Transportation
Disaggregation of Revenue [Line Items]
Net sales	41.3	39.3	81.3	73.4
Defense and emergency
Disaggregation of Revenue [Line Items]
Net sales	30.9	33.2	60.1	70.0
Healthcare
Disaggregation of Revenue [Line Items]
Net sales	4.8	9.3	12.3	16.7
Gas Cylinders
Disaggregation of Revenue [Line Items]
Net sales	58.1	60.4	116.5	119.7
Gas Cylinders | General industrial
Disaggregation of Revenue [Line Items]
Net sales	11.0	13.8	24.1	26.8
Gas Cylinders | Transportation
Disaggregation of Revenue [Line Items]
Net sales	24.1	19.6	45.0	36.3
Gas Cylinders | Defense and emergency
Disaggregation of Revenue [Line Items]
Net sales	18.7	18.7	37.4	41.9
Gas Cylinders | Healthcare
Disaggregation of Revenue [Line Items]
Net sales	4.3	8.3	10.0	14.7
Elektron
Disaggregation of Revenue [Line Items]
Net sales	58.4	67.8	120.4	128.2
Elektron | General industrial
Disaggregation of Revenue [Line Items]
Net sales	28.5	32.6	59.1	61.0
Elektron | Transportation
Disaggregation of Revenue [Line Items]
Net sales	17.2	19.7	36.3	37.1
Elektron | Defense and emergency
Disaggregation of Revenue [Line Items]
Net sales	12.2	14.5	22.7	28.1
Elektron | Healthcare
Disaggregation of Revenue [Line Items]
Net sales	$ 0.5	$ 1.0	$ 2.3	$ 2.0

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+ References

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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