Restructuring Activities - Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Restructuring Reserve
Beginning balance, restructuring accrual	$ 0.5	$ 2.8	$ 0.8	$ 0.9	$ 0.9
Restructuring charges	0.3	5.6	1.0	10.8
Cash payments and other	(0.6)	(6.5)	(1.6)	(9.8)
Ending balance, restructuring accrual	0.2	1.9	0.2	1.9	0.8
Operating Segments | Cryo Tank Solutions
Restructuring Reserve
Beginning balance, restructuring accrual	0.5	1.5	0.5	0.5	0.5
Restructuring charges	0.0	1.1	0.3	2.9
Cash payments and other	(0.2)	(1.2)	(0.5)	(2.0)
Ending balance, restructuring accrual	0.3	1.4	0.3	1.4	0.5
Operating Segments | Heat Transfer Systems
Restructuring Reserve
Beginning balance, restructuring accrual	0.0	0.5	0.2	0.2	0.2
Restructuring charges	0.3	2.9	0.7	5.7
Cash payments and other	(0.4)	(3.2)	(1.0)	(5.7)
Ending balance, restructuring accrual	(0.1)	0.2	(0.1)	0.2	0.2
Operating Segments | Specialty Products
Restructuring Reserve
Beginning balance, restructuring accrual	0.0	0.0	0.0	0.0	0.0
Restructuring charges	0.0	0.0	0.0	0.0
Cash payments and other	0.0	0.0	0.0	0.0
Ending balance, restructuring accrual	0.0	0.0	0.0	0.0	0.0
Operating Segments | Repair, Service & Leasing
Restructuring Reserve
Beginning balance, restructuring accrual	0.0	0.0	0.0	0.0	0.0
Restructuring charges	0.0	0.0	0.0	0.0
Cash payments and other	0.0	0.0	0.0	0.0
Ending balance, restructuring accrual	0.0	0.0	0.0	0.0	0.0
Corporate
Restructuring Reserve
Beginning balance, restructuring accrual	0.0	0.8	0.1	0.2	0.2
Restructuring charges	0.0	1.6	0.0	2.2
Cash payments and other	0.0	(2.1)	(0.1)	(2.1)
Ending balance, restructuring accrual	$ 0.0	$ 0.3	$ 0.0	$ 0.3	$ 0.1