Earnings (Loss) Per Share (Schedule of Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Numerator
Net income (loss) from continuing operations		$ (1,440.8)	$ 721.8	$ (52.2)	$ (391.4)
Net loss from discontinued operations		0.0	(8.0)	0.0	(8.0)
Net Income (Loss) Attributable to Air Products		$ (1,440.8)	$ 713.8	$ (52.2)	$ (399.4)
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)		0.0	0.1	0.0	0.0
Weighted average common shares — Diluted (in shares)		222.8	222.9	222.8	222.7
Per Share Data (U.S. Dollars per share)
Basic EPS from continuing operations (in dollars per share)	[1]	$ (6.47)	$ 3.24	$ (0.23)	$ (1.76)
Basic EPS from discontinued operations (in dollars per share)	[1]	0	(0.04)	0	(0.04)
Basic earnings (loss) per share attributable to Air Products (in dollars per share)	[1]	(6.47)	3.20	(0.23)	(1.79)
Diluted EPS from continuing operations (in dollars per share)	[1]	(6.47)	3.24	(0.23)	(1.76)
Diluted EPS from discontinued operations (in dollars per share)	[1]	0	(0.04)	0	(0.04)
Diluted earnings (loss) per share attributable to Air Products (in dollars per share)	[1]	$ (6.47)	$ 3.20	$ (0.23)	$ (1.79)

[1] (A) Earnings (loss) per share is calculated independently for each component and may not sum to total earnings (loss) per share due to rounding.