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Business Segment and Geographic Information (Schedule of Income Information) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Sep. 30, 2012
Segment Reporting Information [Line Items]          
Business restructuring and cost reduction plans $ 0 $ 0 $ 0 $ 86.8 $ 327.4
Other operating income (4.5) (2.6) (10.6) (10.4)  
Operating income 383.1 482.8 1,145.2 1,124.5  
Merchant Gases [Member]
         
Segment Reporting Information [Line Items]          
Operating income 164.9 164.6 504.0 483.4  
Tonnage Gases [Member]
         
Segment Reporting Information [Line Items]          
Operating income 119.9 134.3 381.2 371.1  
Electronics and Performance Materials [Member]
         
Segment Reporting Information [Line Items]          
Operating income 86.8 176.7 [1] 225.6 340.3 [1]  
Equipment and Energy [Member]
         
Segment Reporting Information [Line Items]          
Operating income 16.0 9.8 45.0 26.9  
Segment Total [Member]
         
Segment Reporting Information [Line Items]          
Operating income $ 387.6 $ 485.4 $ 1,155.8 $ 1,221.7  
[1] Identifiable assets are equal to total assets less investment in net assets of and advances to equity affiliates.