Earnings Per Share (Schedule Of Earnings Per Share) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Earnings Per Share [Abstract]
Income from continuing operations	$ 279.0	$ 285.7	$ 504.9	$ 533.1
Income from discontinued operations	17.0	18.6	39.2	39.8
Net income attributable to Air Products	$ 296.0	$ 304.3	$ 544.1	$ 572.9
Weighted average number of common shares outstanding	211.1	213.8	210.7	214.0
Employee stock options	3.0	4.1	2.9	4.1
Other award plans	0.9	0.9	0.9	0.9
Effect of dilutive securities	3.9	5.0	3.8	5.0
Weighted average number of common shares outstanding assuming dilution	215.0	218.8	214.5	219.0
Income from continuing operations, Basic	$ 1.32	$ 1.34	$ 2.39	$ 2.49
Income from discontinued operations, Basic	$ 0.08	$ 0.08	$ 0.19	$ 0.19
Net Income Attributable to Air Products, Basic	$ 1.40	$ 1.42	$ 2.58	$ 2.68
Income from continuing operations, Diluted	$ 1.30	$ 1.31	$ 2.36	$ 2.44
Income from discontinued operations, Diluted	$ 0.08	$ 0.08	$ 0.18	$ 0.18
Net Income Attributable to Air Products, Diluted	$ 1.38	$ 1.39	$ 2.54	$ 2.62