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Reportable Segments - Segment Income (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information    
Sales to external customers $ 288.5 $ 301.9
Depreciation and amortization expense 19.5 23.6
Operating income (loss) 28.9 15.8
Restructuring costs 0.7 5.2
Operating Segments | Cryo Tank Solutions    
Segment Reporting Information    
Sales to external customers 103.9 98.0
Depreciation and amortization expense 3.9 4.4
Operating income (loss) 15.6 11.6
Restructuring costs 0.3 1.8
Operating Segments | Heat Transfer Systems    
Segment Reporting Information    
Sales to external customers 69.2 112.9
Depreciation and amortization expense 9.5 14.1
Operating income (loss) 3.9 5.5
Restructuring costs 0.4 2.8
Operating Segments | Specialty Products    
Segment Reporting Information    
Sales to external customers 77.3 52.9
Depreciation and amortization expense 3.1 1.4
Operating income (loss) 17.9 13.8
Restructuring costs 0.0 0.0
Operating Segments | Repair, Service & Leasing    
Segment Reporting Information    
Sales to external customers 41.4 40.7
Depreciation and amortization expense 2.6 3.3
Operating income (loss) 8.3 4.6
Restructuring costs 0.0 0.0
Intersegment Eliminations    
Segment Reporting Information    
Sales to external customers (3.3) (2.6)
Depreciation and amortization expense 0.0 0.0
Operating income (loss) 0.0 0.0
Corporate    
Segment Reporting Information    
Sales to external customers 0.0 0.0
Depreciation and amortization expense 0.4 0.4
Operating income (loss) (16.8) (19.7)
Restructuring costs $ 0.0 $ 0.6