Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue
Sales to external customers	$ 322.0	$ 289.5	$ 610.5	$ 591.4
Point in time
Disaggregation of Revenue
Sales to external customers	204.7	160.3	394.7	322.5
Over time
Disaggregation of Revenue
Sales to external customers	117.3	129.2	215.8	268.9
Operating Segments | Cryo Tank Solutions
Disaggregation of Revenue
Sales to external customers	97.8	105.3	201.7	203.3
Operating Segments | Cryo Tank Solutions | Point in time
Disaggregation of Revenue
Sales to external customers	89.8	94.4	188.5	184.2
Operating Segments | Cryo Tank Solutions | Over time
Disaggregation of Revenue
Sales to external customers	8.0	10.9	13.2	19.1
Operating Segments | Heat Transfer Systems
Disaggregation of Revenue
Sales to external customers	65.2	97.3	134.4	210.2
Operating Segments | Heat Transfer Systems | Point in time
Disaggregation of Revenue
Sales to external customers	5.2	8.1	10.8	15.2
Operating Segments | Heat Transfer Systems | Over time
Disaggregation of Revenue
Sales to external customers	60.0	89.2	123.6	195.0
Operating Segments | Specialty Products
Disaggregation of Revenue
Sales to external customers	106.8	48.6	184.1	101.5
Operating Segments | Specialty Products | Point in time
Disaggregation of Revenue
Sales to external customers	73.4	32.6	135.3	71.4
Operating Segments | Specialty Products | Over time
Disaggregation of Revenue
Sales to external customers	33.4	16.0	48.8	30.1
Operating Segments | Repair, Service & Leasing
Disaggregation of Revenue
Sales to external customers	54.6	40.1	96.0	80.8
Operating Segments | Repair, Service & Leasing | Point in time
Disaggregation of Revenue
Sales to external customers	37.8	25.9	64.5	53.9
Operating Segments | Repair, Service & Leasing | Over time
Disaggregation of Revenue
Sales to external customers	16.8	14.2	31.5	26.9
Intersegment Eliminations
Disaggregation of Revenue
Sales to external customers	(2.4)	(1.8)	(5.7)	(4.4)
Intersegment Eliminations | Point in time
Disaggregation of Revenue
Sales to external customers	(1.5)	(0.7)	(4.4)	(2.2)
Intersegment Eliminations | Over time
Disaggregation of Revenue
Sales to external customers	$ (0.9)	$ (1.1)	$ (1.3)	$ (2.2)