Consolidated Income Statements - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Sales		$ 12,698.6	$ 10,323.0	$ 8,856.3
Cost of sales		9,338.5	7,186.1	5,858.1
Facility closure		0.0	23.2	0.0
Selling and administrative		900.6	828.4	775.9
Research and development		102.9	93.5	83.9
Business and asset actions		73.7	0.0	0.0
Gain on exchange with joint venture partner		0.0	36.8	0.0
Company headquarters relocation income (expense)		0.0	0.0	33.8
Other income (expense), net		55.9	52.8	65.4
Operating Income		2,338.8	2,281.4	2,237.6
Equity affiliates' income		481.5	294.1	264.8
Interest expense		128.0	141.8	109.3
Other non-operating income (expense), net		62.4	73.7	30.7
Income From Continuing Operations Before Taxes		2,754.7	2,507.4	2,423.8
Income tax provision		500.8	462.8	478.4
Income From Continuing Operations		2,253.9	2,044.6	1,945.4
Income (Loss) from discontinued operations, net of tax		12.6	70.3	(14.3)
Net Income		2,266.5	2,114.9	1,931.1
Net income attributable to noncontrolling interests of continuing operations		10.4	15.8	44.4
Net Income Attributable to Air Products		2,256.1	2,099.1	1,886.7
Net Income Attributable to Air Products
Net income from continuing operations		2,243.5	2,028.8	1,901.0
Net income (loss) from discontinued operations		12.6	70.3	(14.3)
Net Income Attributable to Air Products		$ 2,256.1	$ 2,099.1	$ 1,886.7
Per Share Data
Basic EPS from continuing operations (in dollars per share)	[1]	$ 10.11	$ 9.16	$ 8.59
Basic EPS from discontinued operations (in dollars per share)	[1]	0.06	0.32	(0.06)
Basic EPS Attributable to Air Products (in dollars per share)	[1]	10.16	9.47	8.53
Diluted EPS from continuing operations (in dollars per share)	[1]	10.08	9.12	8.55
Diluted EPS from discontinued operations (in dollars per share)	[1]	0.06	0.32	(0.06)
Diluted EPS Attributable to Air Products (in dollars per share)	[1]	$ 10.14	$ 9.43	$ 8.49
Weighted Average Common Shares (in millions)
Basic		222.0	221.6	221.2
Diluted		222.5	222.5	222.3

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