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Reportable Segments - Product Sales Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information
Sales to external customers	$ 309.6	$ 277.9	$ 598.9	$ 522.0
Natural gas processing (including petrochemical) applications
Segment Reporting Information
Sales to external customers	81.4	69.0	151.7	127.7
Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	52.0	42.7	100.8	84.9
Industrial gas applications
Segment Reporting Information
Sales to external customers	3.6	3.0	10.7	6.4
HVAC, power and refining applications
Segment Reporting Information
Sales to external customers	19.4	21.7	33.0	40.5
Bulk industrial gas applications
Segment Reporting Information
Sales to external customers	83.1	64.8	160.8	117.8
Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	47.6	56.7	99.1	105.6
Cryobiological storage
Segment Reporting Information
Sales to external customers	22.5	20.0	42.8	39.1
Operating Segments | Energy & Chemicals
Segment Reporting Information
Sales to external customers	120.2	100.8	225.8	190.7
Operating Segments | Energy & Chemicals | Natural gas processing (including petrochemical) applications
Segment Reporting Information
Sales to external customers	81.4	69.0	151.7	127.7
Operating Segments | Energy & Chemicals | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	15.8	7.1	30.4	16.1
Operating Segments | Energy & Chemicals | Industrial gas applications
Segment Reporting Information
Sales to external customers	3.6	3.0	10.7	6.4
Operating Segments | Energy & Chemicals | HVAC, power and refining applications
Segment Reporting Information
Sales to external customers	19.4	21.7	33.0	40.5
Operating Segments | Energy & Chemicals | Bulk industrial gas applications
Segment Reporting Information
Sales to external customers	0.0	0.0	0.0	0.0
Operating Segments | Energy & Chemicals | Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	0.0	0.0	0.0	0.0
Operating Segments | Energy & Chemicals | Cryobiological storage
Segment Reporting Information
Sales to external customers	0.0	0.0	0.0	0.0
Operating Segments | D&S West
Segment Reporting Information
Sales to external customers	115.7	117.6	233.7	218.2
Operating Segments | D&S West | Natural gas processing (including petrochemical) applications
Segment Reporting Information
Sales to external customers	0.0	0.0	0.0	0.0
Operating Segments | D&S West | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	19.9	20.9	42.0	33.9
Operating Segments | D&S West | Industrial gas applications
Segment Reporting Information
Sales to external customers	0.0	0.0	0.0	0.0
Operating Segments | D&S West | HVAC, power and refining applications
Segment Reporting Information
Sales to external customers	0.0	0.0	0.0	0.0
Operating Segments | D&S West | Bulk industrial gas applications
Segment Reporting Information
Sales to external customers	35.7	36.0	73.5	64.6
Operating Segments | D&S West | Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	35.4	40.7	71.5	80.6
Operating Segments | D&S West | Cryobiological storage
Segment Reporting Information
Sales to external customers	24.7	20.0	46.7	39.1
Operating Segments | D&S East
Segment Reporting Information
Sales to external customers	77.7	62.4	146.4	117.5
Operating Segments | D&S East | Natural gas processing (including petrochemical) applications
Segment Reporting Information
Sales to external customers	0.0	0.0	0.0	0.0
Operating Segments | D&S East | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	16.3	16.1	28.4	36.5
Operating Segments | D&S East | Industrial gas applications
Segment Reporting Information
Sales to external customers	0.0	0.0	0.0	0.0
Operating Segments | D&S East | HVAC, power and refining applications
Segment Reporting Information
Sales to external customers	0.0	0.0	0.0	0.0
Operating Segments | D&S East | Bulk industrial gas applications
Segment Reporting Information
Sales to external customers	47.9	29.2	88.1	54.0
Operating Segments | D&S East | Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	13.5	17.1	29.9	27.0
Operating Segments | D&S East | Cryobiological storage
Segment Reporting Information
Sales to external customers	0.0	0.0	0.0	0.0
Intersegment Eliminations
Segment Reporting Information
Sales to external customers	(4.0)	(2.9)	(7.0)	(4.4)
Intersegment Eliminations | Natural gas processing (including petrochemical) applications
Segment Reporting Information
Sales to external customers	0.0	0.0	0.0	0.0
Intersegment Eliminations | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	0.0	(1.4)	0.0	(1.6)
Intersegment Eliminations | Industrial gas applications
Segment Reporting Information
Sales to external customers	0.0	0.0	0.0	0.0
Intersegment Eliminations | HVAC, power and refining applications
Segment Reporting Information
Sales to external customers	0.0	0.0	0.0	0.0
Intersegment Eliminations | Bulk industrial gas applications
Segment Reporting Information
Sales to external customers	(0.5)	(0.4)	(0.8)	(0.8)
Intersegment Eliminations | Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	(1.3)	(1.1)	(2.3)	(2.0)
Intersegment Eliminations | Cryobiological storage
Segment Reporting Information
Sales to external customers	$ (2.2)	$ 0.0	$ (3.9)	$ 0.0

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Amount, including 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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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