Consolidated Income Statements (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Income Statement [Abstract]
Sales	$ 3,171.8	$ 2,916.2	$ 6,274.3	$ 5,847.7
Cost of sales	2,184.4	2,053.9	4,291.9	4,070.4
Selling and administrative expense	227.2	222.0	455.9	464.4
Research and development expense	21.6	22.9	42.0	44.9
Business and asset actions	0.0	2,927.9	22.0	2,927.9
Shareholder activism-related costs	0.0	31.4	0.0	61.3
Other income (expense), net	14.1	13.9	24.7	36.8
Operating Income (Loss)	752.7	(2,328.0)	1,487.2	(1,684.4)
Equity affiliates' income	179.4	145.5	351.6	296.1
Interest expense	49.5	42.2	104.0	84.8
Other non-operating income (expense), net	0.9	(18.6)	(0.5)	20.3
Income (Loss) Before Taxes	883.5	(2,243.3)	1,734.3	(1,452.8)
Income tax expense (benefit)	158.7	(505.8)	318.1	(365.1)
Net Income (Loss)	724.8	(1,737.5)	1,416.2	(1,087.7)
Net income (loss) attributable to noncontrolling interests	14.4	(6.9)	27.6	25.5
Net Income (Loss) Attributable to Air Products	$ 710.4	$ (1,730.6)	$ 1,388.6	$ (1,113.2)
Per Share Data (U.S. Dollars per share)
Basic earnings per share attributable to Air Products (in dollars per share)	$ 3.19	$ (7.77)	$ 6.23	$ (5.00)
Diluted earnings per share attributable to Air Products (in dollars per share)	$ 3.19	$ (7.77)	$ 6.23	$ (5.00)
Weighted Average Common Shares (in millions)
Basic (in shares)	222.8	222.8	222.8	222.7
Diluted (in shares)	222.9	222.8	222.9	222.7