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Reportable Segments - Product Sales Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information
Sales to external customers	$ 357.8	$ 272.2	$ 956.7	$ 794.2
Natural gas processing (including petrochemical) applications
Segment Reporting Information
Sales to external customers	105.7	60.3	257.5	188.0
Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	54.5	44.3	155.4	129.2
Industrial gas applications
Segment Reporting Information
Sales to external customers	6.7	6.6	17.3	13.0
HVAC, power and refining applications
Segment Reporting Information
Sales to external customers	35.7	18.8	68.7	59.3
Bulk industrial gas applications
Segment Reporting Information
Sales to external customers	86.7	72.5	247.5	190.3
Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	48.7	49.5	147.7	155.1
Cryobiological storage
Segment Reporting Information
Sales to external customers	19.8	20.2	62.6	59.3
Operating Segments | E&C Cryogenics
Segment Reporting Information
Sales to external customers	48.9	35.6	131.3	98.6
Operating Segments | E&C Cryogenics | Natural gas processing (including petrochemical) applications
Segment Reporting Information
Sales to external customers	17.6	17.2	64.1	53.1
Operating Segments | E&C Cryogenics | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	17.3	3.4	26.5	11.7
Operating Segments | E&C Cryogenics | Industrial gas applications
Segment Reporting Information
Sales to external customers	6.7	3.3	17.3	13.0
Operating Segments | E&C Cryogenics | HVAC, power and refining applications
Segment Reporting Information
Sales to external customers	7.3	11.7	23.4	20.8
Operating Segments | E&C Cryogenics | Bulk industrial gas applications
Segment Reporting Information
Sales to external customers	0.0	0.0	0.0	0.0
Operating Segments | E&C Cryogenics | Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	0.0	0.0	0.0	0.0
Operating Segments | E&C Cryogenics | Cryobiological storage
Segment Reporting Information
Sales to external customers	0.0	0.0	0.0	0.0
Operating Segments | E&C FinFans
Segment Reporting Information
Sales to external customers	128.6	62.5	272.0	190.2
Operating Segments | E&C FinFans | Natural gas processing (including petrochemical) applications
Segment Reporting Information
Sales to external customers	88.6	43.1	193.9	134.9
Operating Segments | E&C FinFans | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	11.0	9.0	32.2	16.8
Operating Segments | E&C FinFans | Industrial gas applications
Segment Reporting Information
Sales to external customers	0.0	3.3	0.0	0.0
Operating Segments | E&C FinFans | HVAC, power and refining applications
Segment Reporting Information
Sales to external customers	29.0	7.1	45.9	38.5
Operating Segments | E&C FinFans | Bulk industrial gas applications
Segment Reporting Information
Sales to external customers	0.0	0.0	0.0	0.0
Operating Segments | E&C FinFans | Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	0.0	0.0	0.0	0.0
Operating Segments | E&C FinFans | 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	114.9	119.0	344.8	337.2
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	16.1	20.5	58.2	54.4
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	40.7	41.1	114.2	105.7
Operating Segments | D&S West | Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	38.3	37.2	109.8	117.8
Operating Segments | D&S West | Cryobiological storage
Segment Reporting Information
Sales to external customers	19.8	20.2	62.6	59.3
Operating Segments | D&S East
Segment Reporting Information
Sales to external customers	70.4	56.8	216.8	174.3
Operating Segments | D&S East | Natural gas processing (including petrochemical) applications
Segment Reporting Information
Sales to external customers	1.0	0.0	1.0	0.0
Operating Segments | D&S East | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	10.2	11.8	38.6	48.3
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	48.2	31.8	136.3	85.8
Operating Segments | D&S East | Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	11.0	13.2	40.9	40.2
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	(5.0)	(1.7)	(8.2)	(6.1)
Intersegment Eliminations | Natural gas processing (including petrochemical) applications
Segment Reporting Information
Sales to external customers	(1.5)	0.0	(1.5)	0.0
Intersegment Eliminations | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	(0.1)	(0.4)	(0.1)	(2.0)
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	(0.6)	0.0	(0.6)	0.0
Intersegment Eliminations | Bulk industrial gas applications
Segment Reporting Information
Sales to external customers	(2.2)	(0.4)	(3.0)	(1.2)
Intersegment Eliminations | Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	(0.6)	(0.9)	(3.0)	(2.9)
Intersegment Eliminations | Cryobiological storage
Segment Reporting Information
Sales to external customers	$ 0.0	$ 0.0	$ 0.0	$ 0.0

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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