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, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share
Income from continuing operations	$ 290.0	$ 283.5	$ 614.6	$ 570.6
Income from discontinued operations	0	0	0	3.1
Net Income Attributable to Air Products	$ 290.0	$ 283.5	$ 614.6	$ 573.7
Weighted average number of common shares outstanding	214.9	212.4	214.5	212.1
Employee stock option and other award plans	2.5	2.5	2.5	2.5
Weighted average number of common shares outstanding assuming dilution	217.4	214.9	217.0	214.6
Income from Continuing Operations, Basic	$ 1.35	$ 1.33	$ 2.87	$ 2.69
Income (loss) from Discontinued Operations, Basic	$ 0	$ 0	$ 0	$ 0.01
Net Income Attributable to Air Products	$ 1.35	$ 1.33	$ 2.87	$ 2.7
Income from Continuing Operations, Diluted	$ 1.33	$ 1.32	$ 2.83	$ 2.66
Income from Discontinued Operations, Diluted	$ 0	$ 0	$ 0	$ 0.01
Net Income Attributable to Air Products	$ 1.33	$ 1.32	$ 2.83	$ 2.67