Revenue - Disaggregation by Timing (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
Disaggregation of Revenue
Sales to external customers	$ 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
Point in time
Disaggregation of Revenue
Sales to external customers									697.3	685.1	677.8
Over time
Disaggregation of Revenue
Sales to external customers									479.8	530.4	326.1
Operating Segments | Cryo Tank Solutions
Disaggregation of Revenue
Sales to external customers									415.8	409.9	371.4
Operating Segments | Cryo Tank Solutions | Point in time
Disaggregation of Revenue
Sales to external customers									378.3	385.2	366.9
Operating Segments | Cryo Tank Solutions | Over time
Disaggregation of Revenue
Sales to external customers									37.5	24.7	4.5
Operating Segments | Heat Transfer Systems
Disaggregation of Revenue
Sales to external customers									369.8	441.7	289.8
Operating Segments | Heat Transfer Systems | Point in time
Disaggregation of Revenue
Sales to external customers									28.6	26.3	60.3
Operating Segments | Heat Transfer Systems | Over time
Disaggregation of Revenue
Sales to external customers									341.2	415.4	229.5
Operating Segments | Repair, Service & Leasing
Disaggregation of Revenue
Sales to external customers									158.3	162.6	160.4
Operating Segments | Repair, Service & Leasing | Point in time
Disaggregation of Revenue
Sales to external customers									110.3	117.6	102.5
Operating Segments | Repair, Service & Leasing | Over time
Disaggregation of Revenue
Sales to external customers									48.0	45.0	57.9
Operating Segments | Specialty Products
Disaggregation of Revenue
Sales to external customers									242.6	207.9	184.5
Operating Segments | Specialty Products | Point in time
Disaggregation of Revenue
Sales to external customers									184.6	161.2	150.3
Operating Segments | Specialty Products | Over time
Disaggregation of Revenue
Sales to external customers									58.0	46.7	34.2
Intersegment Eliminations
Disaggregation of Revenue
Sales to external customers									(9.4)	(6.6)	(2.2)
Intersegment Eliminations | Point in time
Disaggregation of Revenue
Sales to external customers									(4.5)	(5.2)	(2.2)
Intersegment Eliminations | Over time
Disaggregation of Revenue
Sales to external customers									$ (4.9)	$ (1.4)	$ 0.0