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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Net sales	$ 99.5	$ 107.1	$ 116.5	$ 120.4	$ 110.9	$ 129.1	$ 128.2	$ 119.7	$ 443.5	$ 487.9	$ 441.3
General industrial
Disaggregation of Revenue [Line Items]
Net sales									157.7	174.6	145.2
Transportation
Disaggregation of Revenue [Line Items]
Net sales									143.3	151.8	130.3
Defense and emergency
Disaggregation of Revenue [Line Items]
Net sales									118.6	128.7	130.6
Healthcare
Disaggregation of Revenue [Line Items]
Net sales									23.9	32.8	35.2
Gas Cylinders segment
Disaggregation of Revenue [Line Items]
Net sales									223.6	238.1	220.2
Gas Cylinders segment | General industrial
Disaggregation of Revenue [Line Items]
Net sales									46.0	50.7	49.6
Gas Cylinders segment | Transportation
Disaggregation of Revenue [Line Items]
Net sales									83.8	79.0	63.8
Gas Cylinders segment | Defense and emergency
Disaggregation of Revenue [Line Items]
Net sales									73.5	79.3	76.5
Gas Cylinders segment | Healthcare
Disaggregation of Revenue [Line Items]
Net sales									20.3	29.1	30.3
Elektron segment
Disaggregation of Revenue [Line Items]
Net sales									219.9	249.8	221.1
Elektron segment | General industrial
Disaggregation of Revenue [Line Items]
Net sales									111.7	123.9	95.6
Elektron segment | Transportation
Disaggregation of Revenue [Line Items]
Net sales									59.5	72.8	66.5
Elektron segment | Defense and emergency
Disaggregation of Revenue [Line Items]
Net sales									45.1	49.4	54.1
Elektron segment | Healthcare
Disaggregation of Revenue [Line Items]
Net sales									$ 3.6	$ 3.7	$ 4.9

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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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