Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue
Sales to external customers	$ 288.5	$ 301.9
Point in time
Disaggregation of Revenue
Sales to external customers	190.0	162.2
Over time
Disaggregation of Revenue
Sales to external customers	98.5	139.7
Operating Segments | Cryo Tank Solutions
Disaggregation of Revenue
Sales to external customers	103.9	98.0
Operating Segments | Cryo Tank Solutions | Point in time
Disaggregation of Revenue
Sales to external customers	98.7	89.8
Operating Segments | Cryo Tank Solutions | Over time
Disaggregation of Revenue
Sales to external customers	5.2	8.2
Operating Segments | Heat Transfer Systems
Disaggregation of Revenue
Sales to external customers	69.2	112.9
Operating Segments | Heat Transfer Systems | Point in time
Disaggregation of Revenue
Sales to external customers	5.6	7.1
Operating Segments | Heat Transfer Systems | Over time
Disaggregation of Revenue
Sales to external customers	63.6	105.8
Operating Segments | Specialty Products
Disaggregation of Revenue
Sales to external customers	77.3	52.9
Operating Segments | Specialty Products | Point in time
Disaggregation of Revenue
Sales to external customers	61.9	38.8
Operating Segments | Specialty Products | Over time
Disaggregation of Revenue
Sales to external customers	15.4	14.1
Operating Segments | Repair, Service & Leasing
Disaggregation of Revenue
Sales to external customers	41.4	40.7
Operating Segments | Repair, Service & Leasing | Point in time
Disaggregation of Revenue
Sales to external customers	26.7	28.0
Operating Segments | Repair, Service & Leasing | Over time
Disaggregation of Revenue
Sales to external customers	14.7	12.7
Intersegment Eliminations
Disaggregation of Revenue
Sales to external customers	(3.3)	(2.6)
Intersegment Eliminations | Point in time
Disaggregation of Revenue
Sales to external customers	(2.9)	(1.5)
Intersegment Eliminations | Over time
Disaggregation of Revenue
Sales to external customers	$ (0.4)	$ (1.1)