Earnings per Share (Schedule of Earnings per Share) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share
Income from continuing operations	$ 314.0	$ 287.8	$ 884.6	$ 854.0
Income from discontinued operations	0	0.6	3.1	3.1
Net Income Attributable to Air Products	$ 314.0	$ 288.4	$ 887.7	$ 857.1
Weighted average common shares - Basic	212.9	209.4	212.4	209.3
Employee stock option and other award plans	2.5	2.5	2.5	2.6
Weighted average common shares - Diluted	215.4	211.9	214.9	211.9
Income from Continuing Operations, Basic	$ 1.47	$ 1.38	$ 4.17	$ 4.08
Income from Discontinued Operations, Basic	$ 0	$ 0	$ 0.01	$ 0.02
Net Income Attributable to Air Products	$ 1.47	$ 1.38	$ 4.18	$ 4.1
Income from Continuing Operations, Diluted	$ 1.46	$ 1.36	$ 4.12	$ 4.03
Income from Discontinued Operations, Diluted	$ 0	$ 0	$ 0.01	$ 0.01
Net Income Attributable to Air Products	$ 1.46	$ 1.36	$ 4.13	$ 4.04