Consolidated Income Statements (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
Sales	$ 3,022.7	$ 2,985.5	$ 8,870.4	$ 8,913.1
Cost of sales	2,040.1	2,005.6	6,110.5	6,064.3
Selling and administrative expense	222.6	235.4	687.0	714.4
Research and development expense	24.1	27.0	69.0	78.1
Restructuring Charges	24.1	0.0	2,952.0	57.0
Shareholder activism-related costs	25.0	0.0	86.3	0.0
Gain on sale of business	67.3	0.0	67.3	0.0
Other income (expense), net	36.5	20.1	73.3	42.4
Operating Income (Loss)	790.6	737.6	(893.8)	2,041.7
Equity affiliates' income	167.6	168.9	463.7	470.6
Interest expense	61.4	55.7	146.2	169.1
Other non-operating income (expense), net	(6.0)	(1.3)	14.3	(25.3)
Income (Loss) From Continuing Operations Before Taxes	890.8	849.5	(562.0)	2,317.9
Income tax expense (benefit)	159.6	140.6	(205.5)	406.5
Income (Loss) From Continuing Operations	731.2	708.9	(356.5)	1,911.4
Loss from discontinued operations, net of tax	(8.0)	0.0	(8.0)	0.0
Net Income (Loss)	723.2	708.9	(364.5)	1,911.4
Net income attributable to noncontrolling interests	9.4	12.3	34.9	33.1
Net Income (Loss) Attributable to Air Products	713.8	696.6	(399.4)	1,878.3
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
Per Share Data(A) (U.S. Dollars per share)
Basic earnings (loss) per share from continuing operations (in dollars per share)	$ 3.24	$ 3.13	$ (1.76)	$ 8.44
Basic loss per share 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 earnings (loss) per share from continuing operations (in dollars per share)	3.24	3.13	(1.76)	8.43
Diluted loss per share 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
Weighted Average Common Shares (in millions)
Basic (in shares)	222.8	222.5	222.7	222.5
Diluted (in shares)	222.9	222.8	222.7	222.8