Earnings Per Share (Schedule of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share [Abstract]
Net Income Attributable to Air Products	$ 572.2	$ 560.4
Weighted average common shares — Basic	222.2	221.9
Employee stock option and other award plans	0.4	0.7
Weighted average common shares — Diluted	222.6	222.6
Basic earnings per share attributable to Air Products (in dollars per share)	$ 2.58	$ 2.53
Diluted earnings per share attributable to Air Products (in dollars per share)	$ 2.57	$ 2.52