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, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Numerator
Net Income (Loss) Attributable to Air Products	$ 710.4	$ (1,730.6)	$ 1,388.6	$ (1,113.2)
Denominator (in millions)
Weighted average common shares — Basic (in shares)	222.8	222.8	222.8	222.7
Effect of dilutive securities:
Employee award plans (in shares)	0.1	0.0	0.1	0.0
Weighted average common shares — Diluted (in shares)	222.9	222.8	222.9	222.7
Per Share Data (U.S. Dollars per share)
Basic earnings per share attributable to Air Products (in dollars per share)	$ 3.19	$ (7.77)	$ 6.23	$ (5.00)
Diluted earnings per share attributable to Air Products (in dollars per share)	$ 3.19	$ (7.77)	$ 6.23	$ (5.00)