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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Segment Reporting Information [Line Items]          
Total net sales $ 234.6 $ 222.6 $ 434.8 $ 422.4  
Total operating income 23.9 18.2 36.7 30.3  
Interest expense 0.9 1.7 1.9 6.2  
Debt settlement charges 0 0 0 8.7  
Other expense (income), net 0.3 0.1 0.3 (0.1)  
Income before income taxes 22.7 16.4 34.5 15.5  
Total identifiable assets 658.5   658.5   644.8
Discontinued Operations [Member]
          
Segment Reporting Information [Line Items]          
Total identifiable assets 5.2   5.2   5.4
Continuing Operations [Member]
          
Segment Reporting Information [Line Items]          
Total identifiable assets 653.3   653.3   639.4
Corporate and Eliminations
          
Segment Reporting Information [Line Items]          
Total operating income (6.4) (4.6) (12.3) (11.4)  
Total identifiable assets 60.7   60.7   73.6
Environmental Solutions
          
Segment Reporting Information [Line Items]          
Total net sales 139.2 128.3 259.9 240.0  
Total operating income 23.1 15.8 38.3 28.5  
Total identifiable assets 249.4   249.4   236.0
Safety And Security Systems
          
Segment Reporting Information [Line Items]          
Total net sales 61.3 56.8 116.3 115.3  
Total operating income 7.5 3.6 11.8 9.1  
Total identifiable assets 214.3   214.3   213.4
Fire Rescue
          
Segment Reporting Information [Line Items]          
Total net sales 34.1 37.5 58.6 67.1  
Total operating income (0.3) 3.4 (1.1) 4.1  
Total identifiable assets $ 128.9   $ 128.9   $ 116.4