Earnings per Share (Schedule of Earnings per Share) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share
Income from continuing operations	$ 287.1	$ 276.9
Income from discontinued operations	3.1	1.4
Net Income Attributable to Air Products	$ 290.2	$ 278.3
Weighted average common shares - Basic	211.8	210.0
Employee stock option and other award plans	2.5	2.6
Weighted average common shares - Diluted	214.3	212.6
Income from Continuing Operations, Basic	$ 1.36	$ 1.32
Income from Discontinued Operations, Basic	$ 0.01	$ 0.01
Net Income Attributable to Air Products	$ 1.37	$ 1.33
Income from Continuing Operations, Diluted	$ 1.34	$ 1.30
Income from Discontinued Operations, Diluted	$ 0.01	$ 0.01
Net Income Attributable to Air Products	$ 1.35	$ 1.31