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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Segment Reporting Information [Line Items]          
Total net sales $ 291.0 $ 224.4 $ 540.7 $ 402.2  
Total operating income 38.1 18.8 57.7 30.2  
Interest expense 2.5 1.3 5.0 1.9  
Other expense (income), net 0.4 (0.1) 0.5 (0.3)  
Income before income taxes 35.2 17.6 52.2 28.6  
Total assets 1,016.2   1,016.2   $ 992.3
Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets 1,015.7   1,015.7   991.8
Discontinued Operations          
Segment Reporting Information [Line Items]          
Total assets 0.5   0.5   0.5
Environmental Solutions          
Segment Reporting Information [Line Items]          
Total net sales 233.3 174.3 429.9 302.1  
Total operating income 37.2 21.0 57.8 31.3  
Environmental Solutions | Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets 776.8   776.8   746.4
Safety and Security Systems          
Segment Reporting Information [Line Items]          
Total net sales 57.7 50.1 110.8 100.1  
Total operating income 8.2 5.6 14.3 12.0  
Safety and Security Systems | Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets 210.4   210.4   211.8
Corporate And Eliminations          
Segment Reporting Information [Line Items]          
Total operating income (7.3) $ (7.8) (14.4) $ (13.1)  
Corporate And Eliminations | Continuing Operations          
Segment Reporting Information [Line Items]          
Total assets $ 28.5   $ 28.5   $ 33.6