Consolidated Income Statements (Unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Income Statement [Abstract]
Sales		$ 3,161.0	$ 3,022.7	$ 9,435.3	$ 8,870.4
Cost of sales		2,125.0	2,040.1	6,416.9	6,110.5
Selling and administrative expense		219.1	222.6	675.0	687.0
Research and development expense		21.5	24.1	63.5	69.0
Business and asset actions		2,907.4	24.1	2,929.4	2,952.0
Shareholder activism-related costs		0.0	25.0	0.0	86.3
Gain on sale of business		0.0	67.3	0.0	67.3
Other income (expense), net		14.9	36.5	39.6	73.3
Operating Income (Loss)		(2,097.1)	790.6	(609.9)	(893.8)
Equity affiliates' income		205.2	167.6	556.8	463.7
Interest expense		49.4	61.4	153.4	146.2
Other non-operating income (expense), net		3.6	(6.0)	3.1	14.3
Income (Loss) From Continuing Operations Before Taxes		(1,937.7)	890.8	(203.4)	(562.0)
Income tax expense (benefit)		(515.4)	159.6	(197.3)	(205.5)
Income (Loss) From Continuing Operations		(1,422.3)	731.2	(6.1)	(356.5)
Loss from discontinued operations, net of tax		0.0	(8.0)	0.0	(8.0)
Net Income (Loss)		(1,422.3)	723.2	(6.1)	(364.5)
Net income attributable to noncontrolling interests		18.5	9.4	46.1	34.9
Net Income (Loss) Attributable to Air Products		(1,440.8)	713.8	(52.2)	(399.4)
Net Income (Loss) Attributable to Air Products
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)
Per Share Data (U.S. Dollars per share)
Basic earnings (loss) per share from continuing operations (in dollars per share)	[1]	$ (6.47)	$ 3.24	$ (0.23)	$ (1.76)
Basic loss per share 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 earnings (loss) per share from continuing operations (in dollars per share)	[1]	(6.47)	3.24	(0.23)	(1.76)
Diluted loss per share 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)
Weighted Average Common Shares (in millions)
Basic (in shares)		222.8	222.8	222.8	222.7
Diluted (in shares)		222.8	222.9	222.8	222.7

[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.