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Segment Information - Summary of Net Sales, Operating Income (Loss), and Total Assets by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Segment Reporting Information [Line Items]          
Total net sales $ 308.8 $ 269.4 $ 906.9 $ 810.1  
Total operating income 38.6 30.4 110.7 88.1  
Interest expense 2.1 2.2 6.1 7.2  
Other expense, net 0.2 0.0 0.5 0.5  
Income before income taxes 36.3 28.2 104.1 80.4  
Total assets 1,173.6   1,173.6   $ 1,023.8
Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets 1,173.2   1,173.2   1,023.4
Discontinued Operations          
Segment Reporting Information [Line Items]          
Total assets 0.4   0.4   0.4
Environmental Solutions          
Segment Reporting Information [Line Items]          
Total net sales 254.0 216.3 740.7 646.2  
Total operating income 35.9 28.3 106.4 86.1  
Environmental Solutions | Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets 916.7   916.7   775.2
Safety and Security Systems          
Segment Reporting Information [Line Items]          
Total net sales 54.8 53.1 166.2 163.9  
Total operating income 8.6 8.0 26.8 22.3  
Safety and Security Systems | Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets 217.1   217.1   211.5
Corporate And Eliminations          
Segment Reporting Information [Line Items]          
Total operating income (5.9) $ (5.9) (22.5) $ (20.3)  
Corporate And Eliminations | Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets $ 39.4   $ 39.4   $ 36.7