Earnings Per Share (Schedule of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Numerator
Net income attributable to Air Products	$ 609.3	$ 572.2
Denominator (in millions)
Weighted average common shares — Basic	222.5	222.2
Employee stock option and other award plans	0.3	0.4
Weighted average common shares — Diluted	222.8	222.6
Per Share Data
Basic earnings per share attributable to Air Products (in dollars per share)	$ 2.74	$ 2.58
Diluted earnings per share attributable to Air Products (in dollars per share)	$ 2.73	$ 2.57