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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, 2017
Mar. 31, 2016
Segment Reporting Information [Line Items]    
Total net sales $ 177.8 $ 172.8
Total operating income 11.3 16.1
Interest expense 0.6 0.4
Write off of Deferred Debt Issuance Cost 0.0 0.3
Other income, net (0.3) (0.7)
Income before income taxes 11.0 16.1
Corporate and Eliminations    
Segment Reporting Information [Line Items]    
Total operating income (5.4) (5.3)
Environmental Solutions | Operating Segments    
Segment Reporting Information [Line Items]    
Total net sales 127.8 115.4
Total operating income 10.3 16.5
Safety & Security Systems | Operating Segments    
Segment Reporting Information [Line Items]    
Total net sales 50.0 57.4
Total operating income $ 6.4 $ 4.9