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Segment Information - Summary of Net Sales, Operating Income (Loss), and Total Assets by Segment (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Segment Reporting Information [Line Items]          
Total net sales $ 219.3 $ 209.3 $ 654.1 $ 631.7  
Total operating income 24.9 18.8 61.6 49.1  
Interest expense 0.9 1.5 2.8 7.7  
Debt settlement charges 0 0 0 8.7  
Other expense (income), net 0.3 0 0.6 (0.1)  
Income before income taxes 23.7 17.3 58.2 32.8  
Total identifiable assets 651.3   651.3   644.8
Discontinued Operations [Member]
          
Segment Reporting Information [Line Items]          
Total identifiable assets 5.1   5.1   5.4
Continuing Operations [Member]
          
Segment Reporting Information [Line Items]          
Total identifiable assets 646.2   646.2   639.4
Corporate and Eliminations
          
Segment Reporting Information [Line Items]          
Total operating income (5.8) (3.6) (18.1)    
Total identifiable assets 57.4   57.4   73.6
Environmental Solutions
          
Segment Reporting Information [Line Items]          
Total net sales 134.1 113.1 394.0 353.1  
Total operating income 21.5 12.1 59.8 40.6  
Total identifiable assets 256.3   256.3   236.0
Safety And Security Systems
          
Segment Reporting Information [Line Items]          
Total net sales 59.7 57.6 176.0 172.9  
Total operating income 9.4 7.0 21.2 16.1  
Total identifiable assets 214.3   214.3   213.4
Fire Rescue
          
Segment Reporting Information [Line Items]          
Total net sales 25.5 38.6 84.1 105.7  
Total operating income (0.2) 3.3 (1.3) 7.4  
Total identifiable assets $ 118.2   $ 118.2   $ 116.4