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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
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Total net sales $ 286.1 $ 273.8  
Total operating income 32.3 25.8  
Interest expense 1.5 2.0  
Other expense, net 0.2 0.4  
Income before income taxes 30.6 23.4  
Total assets 1,227.1   $ 1,165.5
Continuing Operations      
Segment Reporting Information [Line Items]      
Total assets 1,226.8   1,165.2
Discontinued Operations      
Segment Reporting Information [Line Items]      
Total assets 0.3   0.3
Environmental Solutions      
Segment Reporting Information [Line Items]      
Total net sales 233.0 219.5  
Total operating income 29.4 25.7  
Environmental Solutions | Continuing Operations      
Segment Reporting Information [Line Items]      
Total assets 939.0   908.1
Safety and Security Systems      
Segment Reporting Information [Line Items]      
Total net sales 53.1 54.3  
Total operating income 7.4 8.7  
Safety and Security Systems | Continuing Operations      
Segment Reporting Information [Line Items]      
Total assets 223.4   222.6
Corporate And Eliminations      
Segment Reporting Information [Line Items]      
Total operating income (4.5) $ (8.6)  
Corporate And Eliminations | Continuing Operations      
Segment Reporting Information [Line Items]      
Total assets $ 64.4   $ 34.5