Earnings (Loss) 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, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Numerator
Net income (loss) attributable to Air Products	$ (1,730.6)	$ 572.4	$ (1,113.2)	$ 1,181.7
Denominator (in millions)
Weighted average common shares — Basic (in shares)	222.8	222.5	222.7	222.5
Effect of dilutive securities:
Employee stock option and other award plans (in shares)	0.0	0.2	0.0	0.3
Weighted average common shares — Diluted (in shares)	222.8	222.7	222.7	222.8
Per Share Data (U.S. Dollars per share)
Basic earnings(loss) per share attributable to Air Products (in dollars per share)	$ (7.77)	$ 2.57	$ (5.00)	$ 5.31
Diluted earnings (loss) per share attributable to Air Products (in dollars per share)	$ (7.77)	$ 2.57	$ (5.00)	$ 5.30