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Summary of Continuing Operations by Segment (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]      
Total net sales $ 803.2 $ 688.7 $ 633.1
Total operating income 51.5 33.2 12.4
Interest expense 21.4 16.4 10.2
Total depreciation and amortization 13.2 13.0 11.4
Debt settlement charges 3.5    
Total capital expenditures 13.0 13.5 11.3
Total identifiable assets 613.2 706.7  
Other expenses 0.7 0.2 1.2
Income before income taxes 25.9 16.6 1.0
Safety And Security Systems
      
Segment Reporting Information [Line Items]      
Total net sales 240.3 221.4 214.5
Total operating income 27.9 21.5 23.7
Total depreciation and amortization 4.3 4.4 3.7
Total capital expenditures 2.7 3.6 3.0
Total identifiable assets 209.5 200.3  
Fire Rescue
      
Segment Reporting Information [Line Items]      
Total net sales 135.1 109.5 108.8
Total operating income 8.9 6.6 9.4
Total depreciation and amortization 2.6 2.5 2.2
Total capital expenditures 3.1 2.9 1.1
Total identifiable assets 122.5 117.3  
Environmental Solutions
      
Segment Reporting Information [Line Items]      
Total net sales 427.8 357.8 309.8
Total operating income 42.0 24.5 17.9
Total depreciation and amortization 5.4 5.2 4.7
Total capital expenditures 6.4 6.7 6.5
Total identifiable assets 237.5 231.7  
Corporate
      
Segment Reporting Information [Line Items]      
Total operating income (27.3) (19.4) (38.6)
Total depreciation and amortization 0.9 0.9 0.8
Total capital expenditures 0.8 0.3 0.7
Total identifiable assets 41.7 24.1  
Segment, Continuing Operations
      
Segment Reporting Information [Line Items]      
Total identifiable assets 611.2 573.4  
Segment, Discontinued Operations
      
Segment Reporting Information [Line Items]      
Total identifiable assets $ 2.0 $ 133.8