Consolidated Income Statements - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Sales		$ 12,100.6	$ 12,600.0	$ 12,698.6
Cost of sales		8,168.7	8,833.0	9,338.5
Selling and administrative expense		942.4	957.0	900.6
Research and development expense		100.2	105.6	102.9
Gain on sale of business		1,575.6	0.0	0.0
Business and asset actions		57.0	244.6	73.7
Other income (expense), net		58.2	34.8	55.9
Operating Income		4,466.1	2,494.6	2,338.8
Equity affiliates' income		647.7	604.3	481.5
Interest expense		218.8	177.5	128.0
Other non-operating income (expense), net		(73.8)	(39.0)	62.4
Income From Continuing Operations Before Taxes		4,821.2	2,882.4	2,754.7
Income tax provision		944.9	551.2	500.8
Income From Continuing Operations		3,876.3	2,331.2	2,253.9
(Loss) Income from discontinued operations, net of tax		(13.9)	7.4	12.6
Net Income		3,862.4	2,338.6	2,266.5
Net income attributable to noncontrolling interests of continuing operations		34.2	38.4	10.4
Net Income Attributable to Air Products		3,828.2	2,300.2	2,256.1
Net Income Attributable to Air Products
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
Per Share Data
Income (Loss) from Continuing Operations, Per Basic Share	[1]	$ 17.27	$ 10.31	$ 10.11
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic 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
Weighted Average Common Shares (in millions)
Basic		222.5	222.3	222.0
Diluted		222.8	222.7	222.5

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