Earnings Per Share (Schedule of Earnings per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Numerator
Net income from continuing operations		$ 3,842.1	$ 2,292.8	$ 2,243.5
Net (loss) income from discontinued operations		(13.9)	7.4	12.6
Net Income Attributable to Air Products		$ 3,828.2	$ 2,300.2	$ 2,256.1
Denominator (in millions)
Weighted average common shares — Basic		222.5	222.3	222.0
Effect of dilutive securities
Employee stock option and other award plans		0.3	0.4	0.5
Weighted average common shares — Diluted		222.8	222.7	222.5
Per Share Data
Basic EPS from continuing operations (in dollars per share)	[1]	$ 17.27	$ 10.31	$ 10.11
Basic EPS from discontinued operations (in dollars per share)	[1]	(0.06)	0.03	0.06
Basic EPS attributable to Air Products (in dollars per share)	[1]	17.21	10.35	10.16
Diluted EPS from continuing operations	[1]	17.24	10.30	10.08
Diluted EPS from discontinued operations	[1]	(0.06)	0.03	0.06
Diluted EPS attributable to Air Products (in dollars per share)	[1]	$ 17.18	$ 10.33	$ 10.14

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