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Segment and Geographic Information - Product Sales Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information
Sales	$ 342.4	$ 357.8	$ 309.6	$ 289.3	$ 290.1	$ 272.2	$ 277.9	$ 244.1	$ 1,299.1	$ 1,084.3	$ 842.9
Natural gas processing (including petrochemical) applications
Segment Reporting Information
Sales									344.3	262.1	152.9
Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales									240.4	175.6	167.5
Industrial gas production applications
Segment Reporting Information
Sales									25.2	13.6	22.4
HVAC, power and refining applications
Segment Reporting Information
Sales									85.8	74.2	20.8
Bulk industrial gas applications
Segment Reporting Information
Sales									322.4	273.6	222.5
Packaged gas industrial applications
Segment Reporting Information
Sales									197.5	204.8	179.8
Cryobiological storage
Segment Reporting Information
Sales									83.5	80.4	77.0
Operating Segments | D&S East
Segment Reporting Information
Sales									293.4	246.3	232.3
Operating Segments | D&S East | Natural gas processing (including petrochemical) applications
Segment Reporting Information
Sales									0.0	0.0	0.0
Operating Segments | D&S East | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales									72.7	65.3	80.2
Operating Segments | D&S East | Industrial gas production applications
Segment Reporting Information
Sales									0.0	0.0	0.0
Operating Segments | D&S East | HVAC, power and refining applications
Segment Reporting Information
Sales									0.0	0.0	0.0
Operating Segments | D&S East | Bulk industrial gas applications
Segment Reporting Information
Sales									168.7	126.1	93.4
Operating Segments | D&S East | Packaged gas industrial applications
Segment Reporting Information
Sales									52.0	54.9	58.7
Operating Segments | D&S East | Cryobiological storage
Segment Reporting Information
Sales									0.0	0.0	0.0
Operating Segments | D&S West
Segment Reporting Information
Sales									461.7	455.5	400.6
Operating Segments | D&S West | Natural gas processing (including petrochemical) applications
Segment Reporting Information
Sales									0.0	0.0	0.0
Operating Segments | D&S West | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales									73.1	71.7	58.0
Operating Segments | D&S West | Industrial gas production applications
Segment Reporting Information
Sales									0.0	0.0	0.0
Operating Segments | D&S West | HVAC, power and refining applications
Segment Reporting Information
Sales									0.0	0.0	0.0
Operating Segments | D&S West | Bulk industrial gas applications
Segment Reporting Information
Sales									156.0	148.5	129.6
Operating Segments | D&S West | Packaged gas industrial applications
Segment Reporting Information
Sales									149.0	153.4	136.0
Operating Segments | D&S West | Cryobiological storage
Segment Reporting Information
Sales									83.6	81.9	77.0
Operating Segments | E&C Cryogenics
Segment Reporting Information
Sales									190.2	136.9	125.5
Operating Segments | E&C Cryogenics | Natural gas processing (including petrochemical) applications
Segment Reporting Information
Sales									80.9	79.5	75.5
Operating Segments | E&C Cryogenics | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales									53.4	15.2	18.8
Operating Segments | E&C Cryogenics | Industrial gas production applications
Segment Reporting Information
Sales									25.2	13.6	22.4
Operating Segments | E&C Cryogenics | HVAC, power and refining applications
Segment Reporting Information
Sales									30.7	28.6	8.8
Operating Segments | E&C Cryogenics | Bulk industrial gas applications
Segment Reporting Information
Sales									0.0	0.0	0.0
Operating Segments | E&C Cryogenics | Packaged gas industrial applications
Segment Reporting Information
Sales									0.0	0.0	0.0
Operating Segments | E&C Cryogenics | Cryobiological storage
Segment Reporting Information
Sales									0.0	0.0	0.0
Operating Segments | E&C FinFans
Segment Reporting Information
Sales									361.7	253.6	100.1
Operating Segments | E&C FinFans | Natural gas processing (including petrochemical) applications
Segment Reporting Information
Sales									263.6	182.6	77.4
Operating Segments | E&C FinFans | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales									42.1	25.4	10.7
Operating Segments | E&C FinFans | Industrial gas production applications
Segment Reporting Information
Sales									0.0	0.0	0.0
Operating Segments | E&C FinFans | HVAC, power and refining applications
Segment Reporting Information
Sales									56.0	45.6	12.0
Operating Segments | E&C FinFans | Bulk industrial gas applications
Segment Reporting Information
Sales									0.0	0.0	0.0
Operating Segments | E&C FinFans | Packaged gas industrial applications
Segment Reporting Information
Sales									0.0	0.0	0.0
Operating Segments | E&C FinFans | Cryobiological storage
Segment Reporting Information
Sales									0.0	0.0	0.0
Intersegment Eliminations
Segment Reporting Information
Sales									(7.9)	(8.0)	(15.6)
Intersegment Eliminations | Natural gas processing (including petrochemical) applications
Segment Reporting Information
Sales									(0.2)	0.0	0.0
Intersegment Eliminations | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales									(0.9)	(2.0)	(0.2)
Intersegment Eliminations | Industrial gas production applications
Segment Reporting Information
Sales									0.0	0.0	0.0
Intersegment Eliminations | HVAC, power and refining applications
Segment Reporting Information
Sales									(0.9)	0.0	0.0
Intersegment Eliminations | Bulk industrial gas applications
Segment Reporting Information
Sales									(2.3)	(1.0)	(0.5)
Intersegment Eliminations | Packaged gas industrial applications
Segment Reporting Information
Sales									(3.5)	(3.5)	(14.9)
Intersegment Eliminations | Cryobiological storage
Segment Reporting Information
Sales									$ (0.1)	$ (1.5)	$ 0.0

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+ 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
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