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Segment Information - Summary of Continuing Operations by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]                      
Net sales $ 279.4 $ 269.4 $ 291.0 $ 249.7 $ 247.6 $ 248.7 $ 224.4 $ 177.8 $ 1,089.5 $ 898.5 $ 707.9
Operating income                 121.5 73.6 60.8
Interest expense                 9.3 7.3 1.9
Debt settlement charges                 0.0 0.0 0.3
Pension settlement charges         6.1       0.0 6.1 0.0
Other expense (income), net                 0.6 (0.8) 1.8
Income before income taxes                 111.6 61.0 56.8
Total depreciation and amortization                 36.4 30.0 19.1
Total assets 1,023.8       992.3       1,023.8 992.3 643.2
Total capital expenditures                 14.1 8.0 6.1
Environmental Solutions                      
Segment Reporting Information [Line Items]                      
Net sales                 863.5 692.6 490.7
Operating income                 113.0 72.4 54.5
Total depreciation and amortization                 32.6 25.7 14.5
Total assets 775.2       746.4       775.2 746.4 393.3
Total capital expenditures                 11.1 5.2 3.7
Safety And Security Systems                      
Segment Reporting Information [Line Items]                      
Net sales                 226.0 205.9 217.2
Operating income                 34.1 27.0 27.9
Total depreciation and amortization                 3.7 4.1 4.4
Total assets 211.5       211.8       211.5 211.8 200.1
Total capital expenditures                 2.0 2.2 1.8
Corporate                      
Segment Reporting Information [Line Items]                      
Operating income                 (25.6) (25.8) (21.6)
Total depreciation and amortization                 0.1 0.2 0.2
Total assets 36.7       33.6       36.7 33.6 48.7
Total capital expenditures                 1.0 0.6 0.6
Segment, Continuing Operations                      
Segment Reporting Information [Line Items]                      
Total assets 1,023.4       991.8       1,023.4 991.8 642.1
Segment, Discontinued Operations                      
Segment Reporting Information [Line Items]                      
Total assets $ 0.4       $ 0.5       $ 0.4 $ 0.5 $ 1.1