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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Segment Reporting Information [Line Items]          
Total net sales $ 279.8 $ 308.8 $ 836.0 $ 906.9  
Total operating income 34.0 38.6 97.6 110.7  
Interest expense 1.2 2.1 4.5 6.1  
Other (income) expense, net (0.1) 0.2 2.1 0.5  
Income before income taxes 32.9 36.3 91.0 104.1  
Total assets 1,224.7   1,224.7   $ 1,165.5
Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets 1,224.4   1,224.4   1,165.2
Discontinued Operations          
Segment Reporting Information [Line Items]          
Total assets 0.3   0.3   0.3
Environmental Solutions          
Segment Reporting Information [Line Items]          
Total net sales 231.0 254.0 678.2 740.7  
Total operating income 33.0 35.9 91.0 106.4  
Environmental Solutions | Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets 940.9   940.9   908.1
Safety and Security Systems          
Segment Reporting Information [Line Items]          
Total net sales 48.8 54.8 157.8 166.2  
Total operating income 7.4 8.6 25.2 26.8  
Safety and Security Systems | Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets 226.5   226.5   222.6
Corporate And Eliminations          
Segment Reporting Information [Line Items]          
Total operating income (6.4) $ (5.9) (18.6) $ (22.5)  
Corporate And Eliminations | Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets $ 57.0   $ 57.0   $ 34.5