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Segment Information - Summary of Continuing Operations by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Revenues $ 555.0 $ 474.2 $ 1,583.4 $ 1,389.5
Cost of sales 393.5 333.8 1,121.5 989.1
Gross Profit 161.5 140.4 461.9 400.4
Selling, engineering, general and administrative expenses 61.4 60.1 188.5 175.6
Operating Income (Loss) 94.0 75.9 257.4 211.3
Interest expense, net 2.8 3.0 9.3 9.4
Other Expenses 0.7 0.3 2.2 0.9
Income before income taxes 90.5 72.6 245.9 201.0
Operating Segments        
Segment Reporting Information [Line Items]        
Gross Profit 161.5 140.4 461.9 400.4
Selling, engineering, general and administrative expenses 49.6 48.0 152.1 142.8
Other segment items 4.7 4.1 13.7 12.6
Operating Income (Loss) 107.2 88.3 296.1 245.0
Environmental Solutions        
Segment Reporting Information [Line Items]        
Revenues 465.5 398.2 1,333.4 1,161.0
Cost of sales 343.0 290.4 979.9 857.0
Gross Profit 122.5 107.8 353.5 304.0
Selling, engineering, general and administrative expenses 32.5 32.2 102.9 95.3
Other segment items 4.7 4.1 13.7 12.6
Operating Income (Loss) 85.3 71.5 236.9 196.1
Safety and Security Systems        
Segment Reporting Information [Line Items]        
Revenues 89.5 76.0 250.0 228.5
Cost of sales 50.5 43.4 141.6 132.1
Gross Profit 39.0 32.6 108.4 96.4
Selling, engineering, general and administrative expenses 17.1 15.8 49.2 47.5
Other segment items 0.0 0.0 0.0 0.0
Operating Income (Loss) 21.9 16.8 59.2 48.9
Corporate        
Segment Reporting Information [Line Items]        
Operating Income (Loss) $ 13.2 $ 12.4 $ 38.7 $ 33.7