Earnings (Loss) Per Share (Schedule of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Numerator
Net income (loss) from continuing operations	$ 721.8	$ 696.6	$ (391.4)	$ 1,878.3
Net loss from discontinued operations	(8.0)	0.0	(8.0)	0.0
Net Income (Loss) Attributable to Air Products	$ 713.8	$ 696.6	$ (399.4)	$ 1,878.3
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)	0.1	0.3	0.0	0.3
Weighted average common shares — Diluted (in shares)	222.9	222.8	222.7	222.8
Per Share Data(A) (U.S. Dollars per share)
Basic EPS from continuing operations (in dollars per share)	$ 3.24	$ 3.13	$ (1.76)	$ 8.44
Basic EPS from discontinued operations (in dollars per share)	(0.04)	0	(0.04)	0
Basic Earnings (Loss) Per Share Attributable to Air Products (in dollars per share)	3.20	3.13	(1.79)	8.44
Diluted EPS from continuing operations (in dollars per share)	3.24	3.13	(1.76)	8.43
Diluted EPS from discontinued operations (in dollars per share)	(0.04)	0	(0.04)	0
Diluted Earnings (Loss) Per Share Attributable to Air Products (in dollars per share)	$ 3.20	$ 3.13	$ (1.79)	$ 8.43