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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Segment Reporting Information [Line Items]          
Total net sales $ 324.3 $ 291.0 $ 598.1 $ 540.7  
Total operating income 46.3 38.1 72.1 57.7  
Interest expense 2.0 2.5 4.0 5.0  
Other (income) expense, net (0.1) 0.4 0.3 0.5  
Income before income taxes 44.4 35.2 67.8 52.2  
Total assets 1,095.7   1,095.7   $ 1,023.8
Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets 1,095.3   1,095.3   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 267.2 233.3 486.7 429.9  
Total operating income 44.8 37.2 70.5 57.8  
Environmental Solutions | Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets 838.1   838.1   775.2
Safety and Security Systems          
Segment Reporting Information [Line Items]          
Total net sales 57.1 57.7 111.4 110.8  
Total operating income 9.5 8.2 18.2 14.3  
Safety and Security Systems | Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets 219.3   219.3   211.5
Corporate And Eliminations          
Segment Reporting Information [Line Items]          
Total operating income (8.0) $ (7.3) (16.6) $ (14.4)  
Corporate And Eliminations | Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets $ 37.9   $ 37.9   $ 36.7