Noncontrolling Interests (Schedule of Changes in Ownership Interests) (Details) (USD $) In Millions	3 Months Ended	9 Months Ended
Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Noncontrolling Interests
Net Income Attributable to Air Products	$ 326.5		$ 253.2	$ 899.4	$ 757.0
Decrease in Air Products capital in excess of par value for purchase of noncontrolling interests		(6.1)	(29.0)	(6.1)	(29.0)
Changes from net income attributable to Air Products and transfers to noncontrolling interests	$ 326.5		$ 224.2	$ 893.3	$ 728.0

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
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+ Details