Earnings per Share (Schedule of Earnings per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share
Income from continuing operations	$ 363.6	$ 324.6
Income from discontinued operations	0.0	0.0
Net Income Attributable to Air Products	$ 363.6	$ 324.6
Weighted average number of common shares outstanding	215.8	214.2
Employee stock option and other award plans	1.8	2.4
Weighted average number of common shares outstanding assuming dilution	217.6	216.6
Income from Continuing Operations, Basic	$ 1.68	$ 1.52
Income (loss) from Discontinued Operations, Basic	0	0
Net Income Attributable to Air Products	1.68	1.52
Income from Continuing Operations, Diluted	1.67	1.5
Income from Discontinued Operations, Diluted	0	0
Net Income Attributable to Air Products	$ 1.67	$ 1.5