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, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Numerator
Net income attributable to Air Products	$ 572.4	$ 439.8	$ 1,181.7	$ 1,012.0
Denominator (in millions)
Weighted average common shares — Basic	222.5	222.3	222.5	222.3
Employee stock option and other award plans	0.2	0.4	0.3	0.4
Weighted average common shares — Diluted	222.7	222.7	222.8	222.7
Per Share Data
Basic earnings per share attributable to Air Products (in dollars per share)	$ 2.57	$ 1.98	$ 5.31	$ 4.55
Diluted earnings per share attributable to Air Products (in dollars per share)	$ 2.57	$ 1.97	$ 5.30	$ 4.54