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Segment Information - Summary of Continuing Operations by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Revenues $ 463.8 $ 424.9
Cost of sales 333.0 308.9
Gross Profit 130.8 116.0
Selling, engineering, general and administrative expenses 60.2 57.2
Operating Income (Loss) 65.7 54.3
Interest expense, net 3.0 3.2
Other Expenses 0.7 0.2
Income before income taxes 62.0 50.9
Operating Segments    
Segment Reporting Information [Line Items]    
Gross Profit 130.8 116.0
Selling, engineering, general and administrative expenses 50.9 46.4
Other segment items 4.4 4.1
Operating Income (Loss) 75.5 65.5
Environmental Solutions    
Segment Reporting Information [Line Items]    
Revenues 387.4 354.0
Cost of sales 288.4 267.3
Gross Profit 99.0 86.7
Selling, engineering, general and administrative expenses 34.9 30.9
Other segment items 4.4 4.1
Operating Income (Loss) 59.7 51.7
Safety and Security Systems    
Segment Reporting Information [Line Items]    
Revenues 76.4 70.9
Cost of sales 44.6 41.6
Gross Profit 31.8 29.3
Selling, engineering, general and administrative expenses 16.0 15.5
Other segment items 0.0 0.0
Operating Income (Loss) 15.8 13.8
Corporate    
Segment Reporting Information [Line Items]    
Operating Income (Loss) $ 9.8 $ 11.2