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Reportable Segments - Segment Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Segment Reporting Information          
Sales $ 404.8   $ 322.0 $ 758.9 $ 610.5
Depreciation and amortization expense 21.7   19.8 42.2 39.3
Operating income (loss) 29.6   25.5 49.7 54.3
Restructuring costs 0.2   0.3 0.3 1.0
Change in acquisition-related contingent consideration       (1.0)  
Sustainable Energy Solutions, Inc. (“SES”) and BlueInGreen, LLC (“BIG”)          
Segment Reporting Information          
Change in acquisition-related contingent consideration (0.2)   1.2 (1.0) 2.0
Operating Segments | Cryo Tank Solutions          
Segment Reporting Information          
Sales 132.9   97.8 251.0 201.7
Depreciation and amortization expense 4.1   3.8 8.2 7.7
Operating income (loss) 9.9   13.4 24.0 29.0
Restructuring costs 0.1   0.0 0.1 0.3
Operating Segments | Heat Transfer Systems          
Segment Reporting Information          
Sales 102.9   65.2 182.2 134.4
Depreciation and amortization expense 7.4   9.5 15.1 19.0
Operating income (loss) 5.7   (0.5) 5.5 3.3
Restructuring costs   $ 0.0 0.3 0.1 0.7
Operating Segments | Specialty Products          
Segment Reporting Information          
Sales 115.3   106.8 222.8 184.1
Depreciation and amortization expense 5.4   3.4 9.3 6.5
Operating income (loss) 20.8   23.4 37.0 41.3
Restructuring costs 0.1   0.0 0.1 0.0
Operating Segments | Repair, Service & Leasing          
Segment Reporting Information          
Sales 55.4   54.6 104.7 96.0
Depreciation and amortization expense 4.2   2.7 8.5 5.3
Operating income (loss) 12.0   5.6 20.3 13.9
Restructuring costs   0.0 0.0 0.0 0.0
Intersegment Eliminations          
Segment Reporting Information          
Sales (1.7)   (2.4) (1.8) (5.7)
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 0.6   0.4 1.1 0.8
Operating income (loss) $ (18.8)   (16.4) (37.1) (33.2)
Restructuring costs   $ 0.0 $ 0.0 $ 0.0 $ 0.0