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Segment and Geographic Information - Narratives (Details) $ in Millions			3 Months Ended								12 Months Ended
	Jul. 01, 2019 segment	Jun. 30, 2019 segment	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information
Number of reportable segments (segment) \| segment	4	3
Restructuring charges											$ 15.6	$ 4.4	$ 11.2
Transaction related costs											5.4	2.1	10.1
Severance costs											4.3	3.2	3.6
Share-based compensation expense											9.0	4.9	10.6
Sales to external customers			$ 342.4	$ 357.8	$ 309.6	$ 289.3	$ 290.1	$ 272.2	$ 277.9	$ 244.1	1,299.1	1,084.3	842.9
Assets			2,481.4				1,897.7				2,481.4	1,897.7
Goodwill			844.9				520.7				844.9	520.7	459.7
Identifiable intangible assets, net			529.1				330.4				529.1	330.4
Customer Concentration Risk \| Sales \| Praxair and Linde
Segment Reporting Information
Sales to external customers												$ 121.6
Concentration risk (percent)												11.20%
D&S East
Segment Reporting Information
Goodwill			117.0				73.6				117.0	$ 73.6	37.3
D&S West
Segment Reporting Information
Goodwill			152.1				151.3				152.1	151.3	147.3
E&C Cryogenics
Segment Reporting Information
Goodwill			176.2				0.0				176.2	0.0	0.0
E&C FinFans
Segment Reporting Information
Goodwill			399.6				0.0				399.6	0.0	0.0
Operating Segments \| D&S East
Segment Reporting Information
Restructuring charges											8.5	1.4	1.7
Sales to external customers											293.4	246.3	232.3
Operating Segments \| D&S West
Segment Reporting Information
Restructuring charges											0.9	0.0	1.1
Sales to external customers											461.7	455.5	400.6
Operating Segments \| E&C Cryogenics
Segment Reporting Information
Restructuring charges											2.5	0.6	2.1
Sales to external customers											190.2	136.9	125.5
Operating Segments \| E&C FinFans
Segment Reporting Information
Restructuring charges											3.5	0.1	0.3
Sales to external customers											361.7	253.6	100.1
Corporate
Segment Reporting Information
Restructuring charges											0.2	2.3	6.0
Sales to external customers											0.0	0.0	0.0
Continuing Operations \| Operating Segments \| D&S East
Segment Reporting Information
Assets			528.6				496.1				528.6	496.1
Continuing Operations \| Operating Segments \| D&S West
Segment Reporting Information
Assets			414.9				420.3				414.9	420.3
Continuing Operations \| Operating Segments \| E&C Cryogenics
Segment Reporting Information
Assets			430.3				455.0				430.3	455.0
Continuing Operations \| Operating Segments \| E&C FinFans
Segment Reporting Information
Assets			1,028.0				434.2				1,028.0	434.2
Continuing Operations \| Corporate
Segment Reporting Information
Assets			79.6				$ 92.1				79.6	92.1
AXC
Segment Reporting Information
Transaction related costs											5.4
Integration costs			1.6								1.6
Assets			593.8								593.8
Goodwill			287.5								287.5
AXC \| Continuing Operations \| Operating Segments \| E&C FinFans
Segment Reporting Information
Goodwill			287.5								287.5
Identifiable intangible assets, net			$ 256.4								256.4
Employee severance
Segment Reporting Information
Severance costs												2.3
Share-based compensation expense								(0.9)	(1.8)
Employee severance \| Corporate
Segment Reporting Information
Severance costs												2.3
Share-based compensation expense												(0.9)
Employee severance \| CEO
Segment Reporting Information
Severance costs									1.4
Employee severance \| CEO \| Corporate
Segment Reporting Information
Severance costs												1.4
Share-based compensation expense												(1.8)
Compensation forfeiture
Segment Reporting Information
Severance costs								$ 1.8	$ 3.2
Compensation forfeiture \| Corporate
Segment Reporting Information
Severance costs												1.8
Compensation forfeiture \| CEO \| Corporate
Segment Reporting Information
Severance costs												3.2
Cryobiological storage
Segment Reporting Information
Sales to external customers											83.5	80.4	77.0
Cryobiological storage \| Operating Segments \| D&S East
Segment Reporting Information
Sales to external customers											0.0	0.0	0.0
Cryobiological storage \| Operating Segments \| D&S West
Segment Reporting Information
Product warranty expense												4.0
Sales to external customers											83.6	81.9	77.0
Cryobiological storage \| Operating Segments \| E&C Cryogenics
Segment Reporting Information
Sales to external customers											0.0	0.0	0.0
Cryobiological storage \| Operating Segments \| E&C FinFans
Segment Reporting Information
Sales to external customers											$ 0.0	$ 0.0	$ 0.0