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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Net income attributable to Air Products	$ 595.6	$ 582.1	$ 1,607.6	$ 1,673.0
Weighted average common shares — Basic	222.4	222.0	222.3	222.0
Employee stock option and other award plans	0.4	0.5	0.4	0.5
Weighted average common shares — Diluted	222.8	222.5	222.7	222.5
Basic EPS attributable to Air Products (in dollars per share)	$ 2.68	$ 2.62	$ 7.23	$ 7.54
Diluted EPS attributable to Air Products (in dollars per share)	$ 2.67	$ 2.62	$ 7.22	$ 7.52