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Segment Information (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Company's net sales, operating income (loss), and total assets by segment          
Net sales $ 204.4 $ 175.6 $ 400.5 $ 325.9  
Operating income (loss) 15.8 10.6 26.1 13.1  
Total assets 720.3   720.3   706.7
Safety and Security Systems [Member]
          
Company's net sales, operating income (loss), and total assets by segment          
Net sales 59.1 56.3 115.4 109.0  
Operating income (loss) 6.3 6.3 10.9 11.5  
Total assets 201.6   201.6   200.3
Fire Rescue [Member]
          
Company's net sales, operating income (loss), and total assets by segment          
Net sales 33.3 24.7 65.1 45.9  
Operating income (loss) 1.7 0.7 2.5 1.5  
Total assets 114.3   114.3   117.3
Environmental Solutions [Member]
          
Company's net sales, operating income (loss), and total assets by segment          
Net sales 112.0 94.6 220.0 171.0  
Operating income (loss) 12.5 9.2 24.5 10.1  
Total assets 243.9   243.9   231.7
Corporate and Eliminations [Member]
          
Company's net sales, operating income (loss), and total assets by segment          
Net sales              
Operating income (loss) (4.7) (5.6) (11.8) (10.0)  
Total assets 36.4   36.4   22.6
Discontinued Operations [Member]
          
Company's net sales, operating income (loss), and total assets by segment          
Total assets $ 124.1   $ 124.1   $ 134.8