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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
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Total net sales $ 200.2 $ 199.8  
Total operating income 12.8 12.1  
Interest expense 1.0 4.5  
Debt settlement charges 0 8.7  
Other income, net 0 (0.2)  
Income before income taxes 11.8 (0.9)  
Total identifiable assets 651.6   644.8
Discontinued Operations [Member]
      
Segment Reporting Information [Line Items]      
Total identifiable assets 5.2   5.4
Continuing Operations [Member]
      
Segment Reporting Information [Line Items]      
Total identifiable assets 646.4   639.4
Corporate and Eliminations
      
Segment Reporting Information [Line Items]      
Total operating income (5.9) (6.8)  
Total identifiable assets 62.1   73.6
Environmental Solutions
      
Segment Reporting Information [Line Items]      
Total net sales 120.7 111.7  
Total operating income 15.2 12.7  
Total identifiable assets 249.0   236.0
Safety And Security Systems
      
Segment Reporting Information [Line Items]      
Total net sales 55.0 58.5  
Total operating income 4.3 5.5  
Total identifiable assets 212.8   213.4
Fire Rescue
      
Segment Reporting Information [Line Items]      
Total net sales 24.5 29.6  
Total operating income (0.8) 0.7  
Total identifiable assets $ 122.5   $ 116.4