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Segment Information - Summary of Continuing Operations by Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Net sales $ 1,213.2 $ 1,130.8 $ 1,221.3
Operating income 130.7 131.4 147.1
Interest expense 4.5 5.7 7.9
Pension settlement charges 10.3 0.0 0.0
Other (income) expense, net (1.7) 1.1 0.6
Income before income taxes 117.6 124.6 138.6
Total depreciation and amortization 50.4 44.8 41.5
Total assets 1,366.1 1,208.8 1,165.5
Total capital expenditures 37.4 29.7 35.4
Continuing operations      
Segment Reporting Information [Line Items]      
Total assets 1,366.1 1,208.6 1,165.2
Discontinued operations      
Segment Reporting Information [Line Items]      
Total assets 0.0 0.2 0.3
Environmental Solutions      
Segment Reporting Information [Line Items]      
Net sales 1,004.0 915.8 992.9
Operating income 120.5 124.3 139.4
Total depreciation and amortization 46.7 41.3 38.1
Total assets 1,098.2 926.8 908.1
Total capital expenditures 34.3 24.4 31.6
Safety And Security Systems      
Segment Reporting Information [Line Items]      
Net sales 209.2 215.0 228.4
Operating income 32.7 35.5 38.6
Total depreciation and amortization 3.6 3.4 3.3
Total assets 226.9 225.5 222.6
Total capital expenditures 2.8 4.1 2.7
Corporate      
Segment Reporting Information [Line Items]      
Operating income (22.5) (28.4) (30.9)
Total depreciation and amortization 0.1 0.1 0.1
Total assets 41.0 56.3 34.5
Total capital expenditures $ 0.3 $ 1.2 $ 1.1