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Revenue - Disaggregation of Revenue (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Disaggregation of Revenue
Revenues	$ 279.7
Point in time
Disaggregation of Revenue
Revenues	198.4
Over time
Disaggregation of Revenue
Revenues	81.3
Natural gas processing (including petrochemical) applications
Disaggregation of Revenue
Revenues	58.7
Liquefied natural gas (LNG) applications
Disaggregation of Revenue
Revenues	42.2
Industrial gas applications
Disaggregation of Revenue
Revenues	3.4
HVAC, power and refining applications
Disaggregation of Revenue
Revenues	18.8
Bulk industrial gas applications
Disaggregation of Revenue
Revenues	53.0
Packaged gas industrial applications
Disaggregation of Revenue
Revenues	48.9
Respiratory therapy
Disaggregation of Revenue
Revenues	28.9
Cryobiological storage
Disaggregation of Revenue
Revenues	19.1
On-site generation systems
Disaggregation of Revenue
Revenues	6.7
Operating Segments | Energy & Chemicals
Disaggregation of Revenue
Revenues	89.9
Operating Segments | Energy & Chemicals | Point in time
Disaggregation of Revenue
Revenues	23.9
Operating Segments | Energy & Chemicals | Over time
Disaggregation of Revenue
Revenues	66.0
Operating Segments | Energy & Chemicals | Natural gas processing (including petrochemical) applications
Disaggregation of Revenue
Revenues	58.7
Operating Segments | Energy & Chemicals | Liquefied natural gas (LNG) applications
Disaggregation of Revenue
Revenues	9.0
Operating Segments | Energy & Chemicals | Industrial gas applications
Disaggregation of Revenue
Revenues	3.4
Operating Segments | Energy & Chemicals | HVAC, power and refining applications
Disaggregation of Revenue
Revenues	18.8
Operating Segments | Energy & Chemicals | Bulk industrial gas applications
Disaggregation of Revenue
Revenues	0.0
Operating Segments | Energy & Chemicals | Packaged gas industrial applications
Disaggregation of Revenue
Revenues	0.0
Operating Segments | Energy & Chemicals | Respiratory therapy
Disaggregation of Revenue
Revenues	0.0
Operating Segments | Energy & Chemicals | Cryobiological storage
Disaggregation of Revenue
Revenues	0.0
Operating Segments | Energy & Chemicals | On-site generation systems
Disaggregation of Revenue
Revenues	0.0
Operating Segments | Distribution & Storage
Disaggregation of Revenue
Revenues	136.1
Operating Segments | Distribution & Storage | Point in time
Disaggregation of Revenue
Revenues	121.1
Operating Segments | Distribution & Storage | Over time
Disaggregation of Revenue
Revenues	15.0
Operating Segments | Distribution & Storage | Natural gas processing (including petrochemical) applications
Disaggregation of Revenue
Revenues	0.0
Operating Segments | Distribution & Storage | Liquefied natural gas (LNG) applications
Disaggregation of Revenue
Revenues	34.2
Operating Segments | Distribution & Storage | Industrial gas applications
Disaggregation of Revenue
Revenues	0.0
Operating Segments | Distribution & Storage | HVAC, power and refining applications
Disaggregation of Revenue
Revenues	0.0
Operating Segments | Distribution & Storage | Bulk industrial gas applications
Disaggregation of Revenue
Revenues	53.0
Operating Segments | Distribution & Storage | Packaged gas industrial applications
Disaggregation of Revenue
Revenues	48.9
Operating Segments | Distribution & Storage | Respiratory therapy
Disaggregation of Revenue
Revenues	0.0
Operating Segments | Distribution & Storage | Cryobiological storage
Disaggregation of Revenue
Revenues	0.0
Operating Segments | Distribution & Storage | On-site generation systems
Disaggregation of Revenue
Revenues	0.0
Operating Segments | BioMedical
Disaggregation of Revenue
Revenues	54.7
Operating Segments | BioMedical | Point in time
Disaggregation of Revenue
Revenues	53.4
Operating Segments | BioMedical | Over time
Disaggregation of Revenue
Revenues	1.3
Operating Segments | BioMedical | Natural gas processing (including petrochemical) applications
Disaggregation of Revenue
Revenues	0.0
Operating Segments | BioMedical | Liquefied natural gas (LNG) applications
Disaggregation of Revenue
Revenues	0.0
Operating Segments | BioMedical | Industrial gas applications
Disaggregation of Revenue
Revenues	0.0
Operating Segments | BioMedical | HVAC, power and refining applications
Disaggregation of Revenue
Revenues	0.0
Operating Segments | BioMedical | Bulk industrial gas applications
Disaggregation of Revenue
Revenues	0.0
Operating Segments | BioMedical | Packaged gas industrial applications
Disaggregation of Revenue
Revenues	0.0
Operating Segments | BioMedical | Respiratory therapy
Disaggregation of Revenue
Revenues	28.9
Operating Segments | BioMedical | Cryobiological storage
Disaggregation of Revenue
Revenues	19.1
Operating Segments | BioMedical | On-site generation systems
Disaggregation of Revenue
Revenues	6.7
Intersegment eliminations
Disaggregation of Revenue
Revenues	(1.0)
Intersegment eliminations | Point in time
Disaggregation of Revenue
Revenues	0.0
Intersegment eliminations | Over time
Disaggregation of Revenue
Revenues	(1.0)
Intersegment eliminations | Natural gas processing (including petrochemical) applications
Disaggregation of Revenue
Revenues	0.0
Intersegment eliminations | Liquefied natural gas (LNG) applications
Disaggregation of Revenue
Revenues	(1.0)
Intersegment eliminations | Industrial gas applications
Disaggregation of Revenue
Revenues	0.0
Intersegment eliminations | HVAC, power and refining applications
Disaggregation of Revenue
Revenues	0.0
Intersegment eliminations | Bulk industrial gas applications
Disaggregation of Revenue
Revenues	0.0
Intersegment eliminations | Packaged gas industrial applications
Disaggregation of Revenue
Revenues	0.0
Intersegment eliminations | Respiratory therapy
Disaggregation of Revenue
Revenues	0.0
Intersegment eliminations | Cryobiological storage
Disaggregation of Revenue
Revenues	0.0
Intersegment eliminations | On-site generation systems
Disaggregation of Revenue
Revenues	$ 0.0

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
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-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

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