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Reportable Segments - Product Sales Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information
Sales to external customers	$ 273.2	$ 338.0	$ 864.7	$ 894.1
Natural gas processing (including petrochemical) and industrial gas applications
Segment Reporting Information
Sales to external customers	51.7	112.4	201.5	274.8
Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	89.1	54.9	247.0	155.4
HVAC, power and refining applications
Segment Reporting Information
Sales to external customers	12.3	35.7	47.0	68.7
Bulk industrial gas applications
Segment Reporting Information
Sales to external customers	76.7	86.7	230.3	247.5
Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	43.4	48.3	138.9	147.7
Operating Segments | D&S East
Segment Reporting Information
Sales to external customers	85.1	70.4	234.8	216.8
Operating Segments | D&S East | Natural gas processing (including petrochemical) and industrial gas applications
Segment Reporting Information
Sales to external customers	0.0	1.0	0.9	1.0
Operating Segments | D&S East | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	24.0	10.2	65.8	38.6
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	45.9	48.2	129.5	136.3
Operating Segments | D&S East | Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	15.2	11.0	38.6	40.9
Operating Segments | D&S West
Segment Reporting Information
Sales to external customers	91.1	93.3	269.5	280.0
Operating Segments | D&S West | Natural gas processing (including petrochemical) and industrial gas 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	27.2	16.5	60.7	58.2
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	31.7	39.5	102.9	113.0
Operating Segments | D&S West | Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	32.2	37.3	105.9	108.8
Operating Segments | E&C Cryogenics
Segment Reporting Information
Sales to external customers	64.8	48.9	190.7	131.3
Operating Segments | E&C Cryogenics | Natural gas processing (including petrochemical) and industrial gas applications
Segment Reporting Information
Sales to external customers	24.6	24.3	69.7	81.4
Operating Segments | E&C Cryogenics | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	34.3	17.3	102.3	26.5
Operating Segments | E&C Cryogenics | HVAC, power and refining applications
Segment Reporting Information
Sales to external customers	5.9	7.3	18.7	23.4
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 FinFans
Segment Reporting Information
Sales to external customers	40.5	128.6	185.3	272.0
Operating Segments | E&C FinFans | Natural gas processing (including petrochemical) and industrial gas applications
Segment Reporting Information
Sales to external customers	27.1	88.6	131.2	193.9
Operating Segments | E&C FinFans | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	6.8	11.0	25.3	32.2
Operating Segments | E&C FinFans | HVAC, power and refining applications
Segment Reporting Information
Sales to external customers	6.6	29.0	28.8	45.9
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
Intersegment Eliminations
Segment Reporting Information
Sales to external customers	(8.3)	(3.2)	(15.6)	(6.0)
Intersegment Eliminations | Natural gas processing (including petrochemical) and industrial gas applications
Segment Reporting Information
Sales to external customers	0.0	(1.5)	(0.3)	(1.5)
Intersegment Eliminations | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	(3.2)	(0.1)	(7.1)	(0.1)
Intersegment Eliminations | HVAC, power and refining applications
Segment Reporting Information
Sales to external customers	(0.2)	(0.6)	(0.5)	(0.6)
Intersegment Eliminations | Bulk industrial gas applications
Segment Reporting Information
Sales to external customers	(0.9)	(1.0)	(2.1)	(1.8)
Intersegment Eliminations | Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	$ (4.0)	$ 0.0	$ (5.6)	$ (2.0)

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Amount, excluding 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.

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