Earnings (Loss) Per Share (Schedule of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Numerator
Net Income Attributable to Air Products	$ 678.2	$ 617.4
Denominator (in millions)
Weighted average common shares — Basic (in shares)	222.8	222.7
Effect of dilutive securities:
Employee award plans (in shares)	0.1	0.2
Weighted average common shares — Diluted (in shares)	222.9	222.9
Per Share Data (U.S. Dollars per share)
Basic earnings per share attributable to Air Products (in dollars per share)	$ 3.04	$ 2.77
Diluted earnings per share attributable to Air Products (in dollars per share)	$ 3.04	$ 2.77