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Segment Information - Summary of Net Sales, Operating Income (Loss), and Total Assets by Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Segment Reporting Information [Line Items]          
Total net sales $ 230.8 $ 234.6 $ 452.4 $ 434.8  
Total operating income 29.2 23.9 54.0 36.7  
Interest expense 0.6 0.9 1.2 1.9  
Other expense, net 0.1 0.3 1.0 0.3  
Income before income taxes 28.5 22.7 51.8 34.5  
Total identifiable assets 660.7   660.7   $ 658.7
Discontinued Operations [Member]          
Segment Reporting Information [Line Items]          
Total identifiable assets 3.7   3.7   4.2
Continuing Operations [Member]          
Segment Reporting Information [Line Items]          
Total identifiable assets 657.0   657.0   654.5
Corporate and Eliminations          
Segment Reporting Information [Line Items]          
Total operating income (7.3) (6.4) (13.3) (12.3)  
Total identifiable assets 60.4   60.4   68.0
Environmental Solutions          
Segment Reporting Information [Line Items]          
Total net sales 146.6 139.2 286.8 259.9  
Total operating income 29.2 23.1 53.1 38.3  
Total identifiable assets 271.9   271.9   254.2
Safety And Security Systems          
Segment Reporting Information [Line Items]          
Total net sales 58.8 61.3 115.1 116.3  
Total operating income 7.3 7.5 13.9 11.8  
Total identifiable assets 202.7   202.7   208.3
Fire Rescue          
Segment Reporting Information [Line Items]          
Total net sales 25.4 34.1 50.5 58.6  
Total operating income 0.0 $ (0.3) 0.3 $ (1.1)  
Total identifiable assets $ 122.0   $ 122.0   $ 124.0