Reportable Segments - Segment Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information
Sales	$ 412.1	$ 328.3	$ 1,171.0	$ 938.8
Depreciation and amortization expense	20.2	20.5	62.4	59.8
Operating income (loss)	41.7	13.8	91.4	68.1
Restructuring costs (credit)	(1.4)	1.9	(1.1)	2.9
Change in acquisition-related contingent consideration			(2.7)
Sustainable Energy Solutions, Inc. (“SES”) and BlueInGreen, LLC (“BIG”)
Segment Reporting Information
Change in acquisition-related contingent consideration	(1.7)	0.3	(2.7)	2.3
Operating Segments | Cryo Tank Solutions
Segment Reporting Information
Sales	126.9	112.2	377.9	313.9
Depreciation and amortization expense	4.0	3.3	12.2	11.0
Operating income (loss)	12.2	13.0	36.2	42.0
Restructuring costs (credit)	0.0	0.0	0.1	0.3
Operating Segments | Heat Transfer Systems
Segment Reporting Information
Sales	132.1	56.4	314.3	190.8
Depreciation and amortization expense	7.2	9.5	22.3	28.5
Operating income (loss)	18.3	(10.0)	23.8	(6.7)
Restructuring costs (credit)	0.0	0.5	0.1	1.2
Operating Segments | Specialty Products
Segment Reporting Information
Sales	108.1	116.9	330.9	301.0
Depreciation and amortization expense	4.3	4.4	13.6	10.9
Operating income (loss)	16.7	26.4	53.7	67.7
Restructuring costs (credit)	(0.1)	0.0	0.0	0.0
Operating Segments | Repair, Service & Leasing
Segment Reporting Information
Sales	49.7	46.3	154.4	142.3
Depreciation and amortization expense	4.2	2.9	12.7	8.2
Operating income (loss)	12.0	2.2	32.3	16.1
Restructuring costs (credit)	(1.3)	1.4	(1.3)	1.4
Intersegment Eliminations
Segment Reporting Information
Sales	(4.7)	(3.5)	(6.5)	(9.2)
Depreciation and amortization expense	0.0	0.0	0.0	0.0
Operating income (loss)	0.0	0.0	0.0	0.0
Corporate
Segment Reporting Information
Sales	0.0	0.0	0.0	0.0
Depreciation and amortization expense	0.5	0.4	1.6	1.2
Operating income (loss)	(17.5)	(17.8)	(54.6)	(51.0)
Restructuring costs (credit)	$ 0.0	$ 0.0	$ 0.0	$ 0.0