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Noncontrolling Interests (Tables)
9 Months Ended
Jun. 30, 2012
Noncontrolling Interests  
Schedule of Changes in Ownership Interests
   Three Months Ended Nine Months Ended
   30 June 30 June
   20122011 20122011
 Net Income Attributable to Air Products $ 484.5 $ 326.5  $ 1,028.6 $ 899.4 
 Transfers to noncontrolling interests:             
  Decrease in Air Products capital in excess of par value for purchase of noncontrolling interests  -   -    (4.4)   (6.1) 
 Changes from net income attributable to Air Products and transfers to noncontrolling interests$ 484.5 $ 326.5  $ 1,024.2 $ 893.3