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Segment Information (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Company's net sales, operating income (loss), and total assets by segment          
Net sales $ 185.0 $ 167.8 $ 585.5 $ 493.7  
Operating income (loss) 12.4 8.5 38.5 21.7  
Total assets 607.2   607.2   706.7
Safety and Security Systems [Member]
          
Company's net sales, operating income (loss), and total assets by segment          
Net sales 57.8 52.0 173.2 161.0  
Operating income (loss) 7.8 4.4 18.7 15.9  
Total assets 205.8   205.8   200.3
Fire Rescue [Member]
          
Company's net sales, operating income (loss), and total assets by segment          
Net sales 25.6 22.2 90.7 68.1  
Operating income (loss) 1.9 0.2 4.4 1.7  
Total assets 111.7   111.7   117.3
Environmental Solutions [Member]
          
Company's net sales, operating income (loss), and total assets by segment          
Net sales 101.6 93.6 321.6 264.6  
Operating income (loss) 9.3 7.7 33.8 17.8  
Total assets 251.9   251.9   231.7
Corporate and Eliminations [Member]
          
Company's net sales, operating income (loss), and total assets by segment          
Net sales              
Operating income (loss) (6.6) (3.8) (18.4) (13.7)  
Total assets 34.9   34.9   22.6
Discontinued Operations [Member]
          
Company's net sales, operating income (loss), and total assets by segment          
Total assets $ 2.9   $ 2.9   $ 134.8