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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue
Sales to external customers	$ 272.2	$ 202.7	$ 794.2	$ 573.5
Point in time
Disaggregation of Revenue
Sales to external customers	175.4		518.4
Over time
Disaggregation of Revenue
Sales to external customers	96.8		275.8
Natural gas processing (including petrochemical) applications
Disaggregation of Revenue
Sales to external customers	63.5	27.3	191.2	91.6
Liquefied natural gas (LNG) applications
Disaggregation of Revenue
Sales to external customers	44.3	39.4	129.2	117.2
Industrial gas applications
Disaggregation of Revenue
Sales to external customers	3.4	11.6	9.8	16.0
HVAC, power and refining applications
Disaggregation of Revenue
Sales to external customers	18.8	2.2	59.3	2.2
Bulk industrial gas applications
Disaggregation of Revenue
Sales to external customers	72.5	60.7	190.3	155.4
Packaged gas industrial applications
Disaggregation of Revenue
Sales to external customers	49.5	44.7	155.1	134.1
Cryobiological storage
Disaggregation of Revenue
Sales to external customers	20.2	16.8	59.3	57.0
Energy & Chemicals
Disaggregation of Revenue
Sales to external customers	98.1	46.6	288.8	126.5
D&S West
Disaggregation of Revenue
Sales to external customers	119.0	99.6	337.2	295.6
D&S East
Disaggregation of Revenue
Sales to external customers	56.8	63.2	174.3	166.7
Operating Segments | Energy & Chemicals
Disaggregation of Revenue
Sales to external customers	98.1	46.6	288.8	126.5
Operating Segments | Energy & Chemicals | Point in time
Disaggregation of Revenue
Sales to external customers	18.9		66.5
Operating Segments | Energy & Chemicals | Over time
Disaggregation of Revenue
Sales to external customers	79.2		222.3
Operating Segments | Energy & Chemicals | Natural gas processing (including petrochemical) applications
Disaggregation of Revenue
Sales to external customers	63.5	27.3	191.2	91.6
Operating Segments | Energy & Chemicals | Liquefied natural gas (LNG) applications
Disaggregation of Revenue
Sales to external customers	12.4	5.5	28.5	16.7
Operating Segments | Energy & Chemicals | Industrial gas applications
Disaggregation of Revenue
Sales to external customers	3.4	11.6	9.8	16.0
Operating Segments | Energy & Chemicals | HVAC, power and refining applications
Disaggregation of Revenue
Sales to external customers	18.8	2.2	59.3	2.2
Operating Segments | Energy & Chemicals | Bulk industrial gas applications
Disaggregation of Revenue
Sales to external customers	0.0	0.0	0.0	0.0
Operating Segments | Energy & Chemicals | Packaged gas industrial applications
Disaggregation of Revenue
Sales to external customers	0.0	0.0	0.0	0.0
Operating Segments | Energy & Chemicals | Cryobiological storage
Disaggregation of Revenue
Sales to external customers	0.0	0.0	0.0	0.0
Operating Segments | D&S West
Disaggregation of Revenue
Sales to external customers	119.0	99.6	337.2	295.6
Operating Segments | D&S West | Point in time
Disaggregation of Revenue
Sales to external customers	102.8		299.3
Operating Segments | D&S West | Over time
Disaggregation of Revenue
Sales to external customers	16.2		37.9
Operating Segments | D&S West | Natural gas processing (including petrochemical) applications
Disaggregation of Revenue
Sales to external customers	0.0	0.0	0.0	0.0
Operating Segments | D&S West | Liquefied natural gas (LNG) applications
Disaggregation of Revenue
Sales to external customers	20.5	13.5	54.4	45.0
Operating Segments | D&S West | Industrial gas applications
Disaggregation of Revenue
Sales to external customers	0.0	0.0	0.0	0.0
Operating Segments | D&S West | HVAC, power and refining applications
Disaggregation of Revenue
Sales to external customers	0.0	0.0	0.0	0.0
Operating Segments | D&S West | Bulk industrial gas applications
Disaggregation of Revenue
Sales to external customers	41.1	35.1	105.7	94.2
Operating Segments | D&S West | Packaged gas industrial applications
Disaggregation of Revenue
Sales to external customers	37.2	34.2	117.8	99.4
Operating Segments | D&S West | Cryobiological storage
Disaggregation of Revenue
Sales to external customers	20.2	16.8	59.3	57.0
Operating Segments | D&S East
Disaggregation of Revenue
Sales to external customers	56.8	63.2	174.3	166.7
Operating Segments | D&S East | Point in time
Disaggregation of Revenue
Sales to external customers	55.0		157.0
Operating Segments | D&S East | Over time
Disaggregation of Revenue
Sales to external customers	1.8		17.3
Operating Segments | D&S East | Natural gas processing (including petrochemical) applications
Disaggregation of Revenue
Sales to external customers	0.0	0.0	0.0	0.0
Operating Segments | D&S East | Liquefied natural gas (LNG) applications
Disaggregation of Revenue
Sales to external customers	11.8	26.2	48.3	67.1
Operating Segments | D&S East | Industrial gas applications
Disaggregation of Revenue
Sales to external customers	0.0	0.0	0.0	0.0
Operating Segments | D&S East | HVAC, power and refining applications
Disaggregation of Revenue
Sales to external customers	0.0	0.0	0.0	0.0
Operating Segments | D&S East | Bulk industrial gas applications
Disaggregation of Revenue
Sales to external customers	31.8	26.5	85.8	64.7
Operating Segments | D&S East | Packaged gas industrial applications
Disaggregation of Revenue
Sales to external customers	13.2	10.5	40.2	34.9
Operating Segments | D&S East | Cryobiological storage
Disaggregation of Revenue
Sales to external customers	0.0	0.0	0.0	0.0
Intersegment Eliminations
Disaggregation of Revenue
Sales to external customers	(1.7)	(6.7)	(6.1)	(15.3)
Intersegment Eliminations | Point in time
Disaggregation of Revenue
Sales to external customers	(1.3)		(4.4)
Intersegment Eliminations | Over time
Disaggregation of Revenue
Sales to external customers	(0.4)		(1.7)
Intersegment Eliminations | Natural gas processing (including petrochemical) applications
Disaggregation of Revenue
Sales to external customers	0.0	0.0	0.0	0.0
Intersegment Eliminations | Liquefied natural gas (LNG) applications
Disaggregation of Revenue
Sales to external customers	(0.4)	(5.8)	(2.0)	(11.6)
Intersegment Eliminations | Industrial gas applications
Disaggregation of Revenue
Sales to external customers	0.0	0.0	0.0	0.0
Intersegment Eliminations | HVAC, power and refining applications
Disaggregation of Revenue
Sales to external customers	0.0	0.0	0.0	0.0
Intersegment Eliminations | Bulk industrial gas applications
Disaggregation of Revenue
Sales to external customers	(0.4)	(0.9)	(1.2)	(3.5)
Intersegment Eliminations | Packaged gas industrial applications
Disaggregation of Revenue
Sales to external customers	(0.9)	0.0	(2.9)	(0.2)
Intersegment Eliminations | Cryobiological storage
Disaggregation of Revenue
Sales to external customers	$ 0.0	$ 0.0	$ 0.0	$ 0.0

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