Earnings Per Share (Schedule of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Numerator
Net income attributable to Air Products	$ 696.6	$ 595.6	$ 1,878.3	$ 1,607.6
Denominator (in millions)
Weighted average common shares — Basic	222.5	222.4	222.5	222.3
Employee stock option and other award plans	0.3	0.4	0.3	0.4
Weighted average common shares — Diluted	222.8	222.8	222.8	222.7
Per Share Data
Basic earnings per share attributable to Air Products (in dollars per share)	$ 3.13	$ 2.68	$ 8.44	$ 7.23
Diluted earnings per share attributable to Air Products (in dollars per share)	$ 3.13	$ 2.67	$ 8.43	$ 7.22