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Segment Information - Summary of Continuing Operations by Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Net sales $ 1,722.7 $ 1,434.8 $ 1,213.2
Operating income 224.5 160.8 130.7
Interest expense, net 19.7 10.3 4.5
Debt settlement charges   0.1  
Pension settlement charges 0.0 0.0 10.3
Other expense (income), net 1.8 (0.4) (1.7)
Income before income taxes 203.0 150.9 117.6
Total depreciation and amortization 60.4 54.7 50.4
Total assets 1,620.5 1,524.3 1,366.1
Segment, Expenditure, Addition to Long-Lived Assets 30.3 53.0 37.4
Environmental Solutions      
Segment Reporting Information [Line Items]      
Net sales 1,437.9 1,190.6 1,004.0
Operating income 209.2 144.5 120.5
Total depreciation and amortization 56.0 50.3 46.7
Total assets 1,290.9 1,206.4 1,098.2
Segment, Expenditure, Addition to Long-Lived Assets 23.0 19.4 34.3
Safety And Security Systems      
Segment Reporting Information [Line Items]      
Net sales 284.8 244.2 209.2
Operating income 54.8 40.8 32.7
Total depreciation and amortization 4.2 4.2 3.6
Total assets 288.1 279.3 226.9
Segment, Expenditure, Addition to Long-Lived Assets 5.2 32.4 2.8
Corporate      
Segment Reporting Information [Line Items]      
Operating income (39.5) (24.5) (22.5)
Total depreciation and amortization 0.2 0.2 0.1
Total assets 41.5 38.6 41.0
Segment, Expenditure, Addition to Long-Lived Assets $ 2.1 $ 1.2 $ 0.3