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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Segment Reporting Information [Line Items]          
Total net sales $ 209.3 $ 185.0 $ 631.7 $ 585.5  
Total operating income 18.8 12.4 49.1 38.5  
Interest expense 1.5 5.2 7.7 15.7  
Debt settlement charges 0 1.9 8.7 3.5  
Other expense (income), net 0 (0.1) (0.1) 0.2  
Income before income taxes 17.3 5.4 32.8 19.1  
Total identifiable assets 656.8   656.8   613.2
Discontinued Operations [Member]
          
Segment Reporting Information [Line Items]          
Total identifiable assets 5.1   5.1   2.0
Continuing Operations [Member]
          
Segment Reporting Information [Line Items]          
Total identifiable assets 651.7   651.7   611.2
Corporate and Eliminations
          
Segment Reporting Information [Line Items]          
Total operating income (3.6) (6.6) (15.0) (18.4)  
Total identifiable assets 76.8   76.8   41.7
Environmental Solutions
          
Segment Reporting Information [Line Items]          
Total net sales 113.1 101.6 353.1 321.6  
Total operating income 12.1 9.3 40.6 33.8  
Total identifiable assets 239.8   239.8   237.5
Safety And Security Systems
          
Segment Reporting Information [Line Items]          
Total net sales 57.6 57.8 172.9 173.2  
Total operating income 7.0 7.8 16.1 18.7  
Total identifiable assets 207.7   207.7   209.5
Fire Rescue
          
Segment Reporting Information [Line Items]          
Total net sales 38.6 25.6 105.7 90.7  
Total operating income 3.3 1.9 7.4 4.4  
Total identifiable assets $ 127.4   $ 127.4   $ 122.5