Segment and Geographic Information - Segment income (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information
Sales	$ 312.4	$ 273.2	$ 289.6	$ 301.9	$ 321.4	$ 338.0	$ 287.1	$ 269.0	$ 1,177.1	$ 1,215.5	$ 1,003.9
Depreciation and amortization expense									84.5	77.7	49.7
Operating income (loss)	$ 22.5	$ 28.1	$ 25.8	$ 15.8	$ 15.5	$ 23.4	16.2	$ (3.1)	92.2	52.0	64.5
Restructuring charges									13.6	15.6	4.3
Transaction related costs											2.1
Total severance costs									10.1	4.3	3.1
Share-based compensation expense									8.6	8.8	4.6
SES & BIG
Segment Reporting Information
Transaction related costs									2.6
AXC
Segment Reporting Information
Transaction related costs										5.4
Prior Period Acquisitions
Segment Reporting Information
Integration costs										4.3
Operating Segments | Cryo Tank Solutions
Segment Reporting Information
Sales									415.8	409.9	371.4
Depreciation and amortization expense									18.5	19.5	13.9
Operating income (loss)									52.5	25.7	41.1
Restructuring charges									2.7	9.1	1.7
Operating Segments | Heat Transfer Systems
Segment Reporting Information
Sales									369.8	441.7	289.8
Depreciation and amortization expense									48.3	42.0	21.7
Operating income (loss)									11.2	17.7	8.7
Restructuring charges									7.4	4.5	0.7
Operating Segments | Heat Transfer Systems | AXC
Segment Reporting Information
Impairment of intangible asset									16.0
Operating Segments | Repair, Service & Leasing
Segment Reporting Information
Sales									158.3	162.6	160.4
Depreciation and amortization expense									10.9	9.7	7.9
Operating income (loss)									30.3	27.9	21.2
Restructuring charges							$ (1.6)		0.2	1.5	(0.1)
Operating Segments | Specialty Products
Segment Reporting Information
Sales									242.6	207.9	184.5
Depreciation and amortization expense									4.8	4.9	4.7
Operating income (loss)									60.7	48.1	44.8
Restructuring charges									0.7	0.3	(0.3)
Intersegment Eliminations
Segment Reporting Information
Sales									(9.4)	(6.6)	(2.2)
Depreciation and amortization expense									0.0	0.0	0.0
Operating income (loss)									0.0	0.0	0.0
Corporate
Segment Reporting Information
Sales									0.0	0.0	0.0
Depreciation and amortization expense									2.0	1.6	1.5
Operating income (loss)									(62.5)	(67.4)	(51.3)
Restructuring charges									$ 2.6	$ 0.2	2.3
Corporate | Employee Severance
Segment Reporting Information
Total severance costs											2.3
Share-based compensation expense											(0.9)
Corporate | Employee Severance | CEO
Segment Reporting Information
Total severance costs											1.4
Share-based compensation expense											(1.8)
Corporate | One-time Termination Benefits
Segment Reporting Information
Total severance costs											1.8
Corporate | One-time Termination Benefits | CEO
Segment Reporting Information
Total severance costs											$ 3.2