Restructuring Activities - Restructuring Accruals (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Reserve
Restructuring Reserve Beginning		$ 0.9	$ 0.8	$ 1.4
Restructuring charges		13.6	15.6	4.3
Property, plant and equipment impairment			(5.6)
Cash payments and other		(13.7)	(9.9)	(4.9)
Restructuring Reserve Ending		0.8	0.9	0.8
Operating Segments | Cryo Tank Solutions
Restructuring Reserve
Restructuring Reserve Beginning		0.5	0.7	0.3
Restructuring charges		2.7	9.1	1.7
Property, plant and equipment impairment			(3.9)
Cash payments and other		(2.7)	(5.4)	(1.3)
Restructuring Reserve Ending		0.5	0.5	0.7
Operating Segments | Heat Transfer Systems
Restructuring Reserve
Restructuring Reserve Beginning		0.2	0.0	0.0
Restructuring charges		7.4	4.5	0.7
Property, plant and equipment impairment			(1.7)
Cash payments and other		(7.4)	(2.6)	(0.7)
Restructuring Reserve Ending		0.2	0.2	0.0
Operating Segments | Repair, Service & Leasing
Restructuring Reserve
Restructuring Reserve Beginning		0.0	0.0	0.0
Restructuring charges	$ (1.6)	0.2	1.5	(0.1)
Property, plant and equipment impairment			0.0
Cash payments and other		(0.2)	(1.5)	0.1
Restructuring Reserve Ending		0.0	0.0	0.0
Operating Segments | Specialty Products
Restructuring Reserve
Restructuring Reserve Beginning		0.0	0.0	0.0
Restructuring charges		0.7	0.3	(0.3)
Property, plant and equipment impairment			0.0
Cash payments and other		(0.7)	(0.3)	0.3
Restructuring Reserve Ending		0.0	0.0	0.0
Corporate
Restructuring Reserve
Restructuring Reserve Beginning		0.2	0.1	1.1
Restructuring charges		2.6	0.2	2.3
Property, plant and equipment impairment			0.0
Cash payments and other		(2.7)	(0.1)	(3.3)
Restructuring Reserve Ending		$ 0.1	$ 0.2	$ 0.1