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Goodwill (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Goodwill [Roll Forward]    
December 31, 2011 (gross) $ 8,945.1  
Acquisitions and adjustments 0.3  
Currency translation 41.8  
March 31, 2012 (gross) 8,987.2  
Accumulated Impairment (2,840.0) [1]  
Goodwill (net) 6,147.2 6,105.1
Climate Solutions [Member]
   
Goodwill [Roll Forward]    
December 31, 2011 (gross) 5,343.9  
Acquisitions and adjustments 0.3  
Currency translation 32.7  
March 31, 2012 (gross) 5,376.9  
Accumulated Impairment (839.8) [1]  
Goodwill (net) 4,537.1  
Residential Solutions [Member]
   
Goodwill [Roll Forward]    
December 31, 2011 (gross) 2,328.0  
Acquisitions and adjustments 0  
Currency translation 0  
March 31, 2012 (gross) 2,328.0  
Accumulated Impairment (1,656.2) [1]  
Goodwill (net) 671.8  
Industrial Technologies [Member]
   
Goodwill [Roll Forward]    
December 31, 2011 (gross) 366.8  
Acquisitions and adjustments 0  
Currency translation 2.1  
March 31, 2012 (gross) 368.9  
Accumulated Impairment 0 [1]  
Goodwill (net) 368.9  
Security Technologies [Member]
   
Goodwill [Roll Forward]    
December 31, 2011 (gross) 906.4  
Acquisitions and adjustments 0  
Currency translation 7.0  
March 31, 2012 (gross) 913.4  
Accumulated Impairment (344.0) [1]  
Goodwill (net) $ 569.4  
[1] No impairment charges were recorded by the Company in 2012.