Consolidated Income Statements (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Sales	$ 2,930.2	$ 3,200.1	$ 5,927.6	$ 6,374.8
Cost of sales	1,991.5	2,282.8	4,058.7	4,555.1
Selling and administrative expense	240.6	251.2	479.0	485.6
Research and development expense	25.4	27.2	51.1	51.6
Business and asset actions	57.0	185.6	57.0	185.6
Other income (expense), net	21.5	6.5	22.3	14.9
Operating Income	637.2	459.8	1,304.1	1,111.8
Equity affiliates' income	143.3	165.9	301.7	275.9
Interest expense	59.9	40.9	113.4	82.1
Other non-operating income (expense), net	(9.2)	(13.9)	(24.0)	(14.5)
Income Before Taxes	711.4	570.9	1,468.4	1,291.1
Income tax provision	130.5	121.0	265.9	257.4
Net Income	580.9	449.9	1,202.5	1,033.7
Net Income Attributable to Noncontrolling Interests	8.5	10.1	20.8	21.7
Net Income Attributable to Air Products	$ 572.4	$ 439.8	$ 1,181.7	$ 1,012.0
Per Share Data
Basic earnings per share attributable to Air Products (in dollars per share)	$ 2.57	$ 1.98	$ 5.31	$ 4.55
Diluted earnings per share attributable to Air Products (in dollars per share)	$ 2.57	$ 1.97	$ 5.30	$ 4.54
Weighted Average Common Shares (in millions)
Basic (in shares)	222.5	222.3	222.5	222.3
Diluted (in shares)	222.7	222.7	222.8	222.7