Earnings Per Share (Schedule of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share [Abstract]
Net income attributable to Air Products	$ 439.8	$ 530.5	$ 1,012.0	$ 1,090.9
Weighted average common shares — Basic	222.3	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	222.7	222.5	222.7	222.5
Basic earnings per share attributable to Air Products	$ 1.98	$ 2.39	$ 4.55	$ 4.91
Basic earnings per share attributable to Air Products	$ 1.97	$ 2.38	$ 4.54	$ 4.90