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Segment Information - Summary of Continuing Operations by Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Net sales $ 1,130.8 $ 1,221.3 $ 1,089.5
Operating income 131.4 147.1 121.5
Interest expense 5.7 7.9 9.3
Other expense, net 1.1 0.6 0.6
Income before income taxes 124.6 138.6 111.6
Total depreciation and amortization 44.8 41.5 36.4
Total assets 1,208.8 1,165.5 1,023.8
Total capital expenditures 29.7 35.4 14.1
Continuing operations      
Segment Reporting Information [Line Items]      
Total assets 1,208.6 1,165.2 1,023.4
Discontinued operations      
Segment Reporting Information [Line Items]      
Total assets 0.2 0.3 0.4
Environmental Solutions      
Segment Reporting Information [Line Items]      
Net sales 915.8 992.9 863.5
Operating income 124.3 139.4 113.0
Total depreciation and amortization 41.3 38.1 32.6
Total assets 926.8 908.1 775.2
Total capital expenditures 24.4 31.6 11.1
Safety And Security Systems      
Segment Reporting Information [Line Items]      
Net sales 215.0 228.4 226.0
Operating income 35.5 38.6 34.1
Total depreciation and amortization 3.4 3.3 3.7
Total assets 225.5 222.6 211.5
Total capital expenditures 4.1 2.7 2.0
Corporate      
Segment Reporting Information [Line Items]      
Operating income (28.4) (30.9) (25.6)
Total depreciation and amortization 0.1 0.1 0.1
Total assets 56.3 34.5 36.7
Total capital expenditures $ 1.2 $ 1.1 $ 1.0