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Summary of Net Sales, Operating Income (Loss), and Total Assets by Segment (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Segment Reporting Information [Line Items]          
Total net sales $ 222.6 $ 204.4 $ 422.4 $ 400.5  
Total operating income 18.2 15.8 30.3 26.1  
Interest expense 1.7 5.4 6.2 10.5  
Debt settlement charges     8.7 1.6  
Other (income) expense, net 0.1 0.5 (0.1) 0.3  
Income before income taxes 16.4 9.9 15.5 13.7  
Total identifiable assets 650.0   650.0   613.2
Environmental Solutions
          
Segment Reporting Information [Line Items]          
Total net sales 128.3 112.0 240.0 220.0  
Total operating income 15.8 12.5 28.5 24.5  
Total identifiable assets 238.3   238.3   237.5
Safety And Security Systems
          
Segment Reporting Information [Line Items]          
Total net sales 56.8 59.1 115.3 115.4  
Total operating income 3.6 6.3 9.1 10.9  
Total identifiable assets 201.5   201.5   209.5
Fire Rescue
          
Segment Reporting Information [Line Items]          
Total net sales 37.5 33.3 67.1 65.1  
Total operating income 3.4 1.7 4.1 2.5  
Total identifiable assets 122.1   122.1   122.5
Corporate and Eliminations
          
Segment Reporting Information [Line Items]          
Total operating income (4.6) (4.7) (11.4) (11.8)  
Total identifiable assets 78.8   78.8   41.7
Segment, Continuing Operations
          
Segment Reporting Information [Line Items]          
Total identifiable assets 640.7   640.7   611.2
Segment, Discontinued Operations
          
Segment Reporting Information [Line Items]          
Total identifiable assets $ 9.3   $ 9.3   $ 2.0