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Reportable Segments - Product Sales Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information
Sales to external customers	$ 310.4	$ 309.6	$ 631.5	$ 598.9
Natural gas processing (including petrochemical) and industrial gas applications
Segment Reporting Information
Sales to external customers	66.5	85.0	149.8	162.4
Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	78.6	52.0	157.9	100.8
HVAC, power and refining applications
Segment Reporting Information
Sales to external customers	17.4	19.4	34.7	33.0
Bulk industrial gas applications
Segment Reporting Information
Sales to external customers	81.1	83.1	153.5	160.8
Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	45.6	47.6	95.1	99.1
Cryobiological storage
Segment Reporting Information
Sales to external customers	21.2	22.5	40.5	42.8
Operating Segments | D&S East
Segment Reporting Information
Sales to external customers	79.7	77.7	149.7	146.4
Operating Segments | D&S East | Natural gas processing (including petrochemical) and industrial gas applications
Segment Reporting Information
Sales to external customers	0.9	0.0	0.9	0.0
Operating Segments | D&S East | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	22.1	16.3	41.8	28.4
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	44.6	47.9	83.6	88.1
Operating Segments | D&S East | Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	11.8	13.5	22.9	29.9
Operating Segments | D&S East | Cryobiological storage
Segment Reporting Information
Sales to external customers	0.3	0.0	0.5	0.0
Operating Segments | D&S West
Segment Reporting Information
Sales to external customers	106.8	115.7	218.4	233.7
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	14.7	19.9	33.5	42.0
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	36.8	35.7	71.1	73.5
Operating Segments | D&S West | Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	34.4	35.4	73.7	71.5
Operating Segments | D&S West | Cryobiological storage
Segment Reporting Information
Sales to external customers	20.9	24.7	40.1	46.7
Operating Segments | E&C Cryogenics
Segment Reporting Information
Sales to external customers	63.7	47.6	125.9	82.7
Operating Segments | E&C Cryogenics | Natural gas processing (including petrochemical) and industrial gas applications
Segment Reporting Information
Sales to external customers	23.5	31.4	45.1	57.3
Operating Segments | E&C Cryogenics | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	34.7	5.3	68.0	9.5
Operating Segments | E&C Cryogenics | HVAC, power and refining applications
Segment Reporting Information
Sales to external customers	5.5	10.9	12.8	15.9
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	64.1	72.6	144.8	143.1
Operating Segments | E&C FinFans | Natural gas processing (including petrochemical) and industrial gas applications
Segment Reporting Information
Sales to external customers	42.1	53.6	104.1	105.1
Operating Segments | E&C FinFans | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	9.9	10.5	18.5	20.9
Operating Segments | E&C FinFans | HVAC, power and refining applications
Segment Reporting Information
Sales to external customers	12.1	8.5	22.2	17.1
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
Intersegment Eliminations
Segment Reporting Information
Sales to external customers	(3.9)	(4.0)	(7.3)	(7.0)
Intersegment Eliminations | Natural gas processing (including petrochemical) and industrial gas applications
Segment Reporting Information
Sales to external customers	0.0	0.0	(0.3)	0.0
Intersegment Eliminations | Liquefied natural gas (LNG) applications
Segment Reporting Information
Sales to external customers	(2.8)	0.0	(3.9)	0.0
Intersegment Eliminations | HVAC, power and refining applications
Segment Reporting Information
Sales to external customers	(0.2)	0.0	(0.3)	0.0
Intersegment Eliminations | Bulk industrial gas applications
Segment Reporting Information
Sales to external customers	(0.3)	(0.5)	(1.2)	(0.8)
Intersegment Eliminations | Packaged gas industrial applications
Segment Reporting Information
Sales to external customers	(0.6)	(1.3)	(1.5)	(2.3)
Intersegment Eliminations | Cryobiological storage
Segment Reporting Information
Sales to external customers	$ 0.0	$ (2.2)	$ (0.1)	$ (3.9)

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