Earnings per Share (Schedule of Earnings per Share) (Details) (USD $) In Millions, except Per Share data	3 Months Ended	9 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Earnings per Share
Income from continuing operations	$ 317.6	$ 253.2	$ 890.5	$ 757.0
Income from discontinued operations	8.9		8.9
Net Income Attributable to Air Products	$ 326.5	$ 253.2	$ 899.4	$ 757.0
Weighted average number of common shares outstanding	212.5	212.3	213.5	212.0
Employee stock options	3.8	3.6	4.0	3.9
Other award plans	1.0	1.0	0.9	1.0
Effect of dilutive securities	4.8	4.6	4.9	4.9
Weighted average number of common shares outstanding assuming dilution	217.3	216.9	218.4	216.9
Income from Continuing Operations, Basic	$ 1.50	$ 1.19	$ 4.17	$ 3.57
Income from Discontinued Operations, Basic	$ 0.04		$ 0.04
Net Income Attributable to Air Products	$ 1.54	$ 1.19	$ 4.21	$ 3.57
Income from Continuing Operations, Diluted	$ 1.46	$ 1.17	$ 4.08	$ 3.49
Income from Discontinued Operations, Diluted	$ 0.04		$ 0.04
Net Income Attributable to Air Products	$ 1.50	$ 1.17	$ 4.12	$ 3.49

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