Consolidated Statements of Equity (Unaudited) - USD ($) $ in Millions		Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Air Products Shareholders' Equity	Non- controlling Interests
Beginning balance at Sep. 30, 2022		$ 13,702.4	$ 249.4	$ 1,141.4	$ 16,520.3	$ (2,786.1)	$ (1,981.0)	$ 13,144.0	$ 558.4
Stockholders' Equity [Roll Forward]
Net income		1,644.2			1,607.6			1,607.6	36.6
Other comprehensive income (loss)		490.9				481.3		481.3	9.6
Dividends on common stock		(1,137.3)			(1,137.3)			(1,137.3)
Distributions to noncontrolling interests		(7.9)							(7.9)
Share-based compensation		42.3		42.3				42.3
Issuance of treasury shares for stock option and award plans		3.4		(7.2)			10.6	3.4
Investments by noncontrolling interests	[1]	636.1							636.1
Other equity transactions		(3.4)		0.4	(3.7)			(3.3)	(0.1)
Ending balance at Jun. 30, 2023		15,370.7	249.4	1,176.9	16,986.9	(2,304.8)	(1,970.4)	14,138.0	1,232.7
Beginning balance at Mar. 31, 2023		14,690.2	249.4	1,163.4	16,781.3	(2,163.3)	(1,972.5)	14,058.3	631.9
Stockholders' Equity [Roll Forward]
Net income		610.5			595.6			595.6	14.9
Other comprehensive income (loss)		(145.9)				(141.5)		(141.5)	(4.4)
Dividends on common stock		(388.8)			(388.8)			(388.8)
Distributions to noncontrolling interests		(2.3)							(2.3)
Share-based compensation		13.3		13.3				13.3
Issuance of treasury shares for stock option and award plans		2.2		0.1			2.1	2.2
Investments by noncontrolling interests	[2]	563.3							563.3
Other equity transactions		28.2		0.1	(1.2)			(1.1)	29.3
Ending balance at Jun. 30, 2023		15,370.7	249.4	1,176.9	16,986.9	(2,304.8)	(1,970.4)	14,138.0	1,232.7
Beginning balance at Sep. 30, 2023		15,660.3	249.4	1,190.5	17,289.7	(2,449.4)	(1,967.3)	14,312.9	1,347.4
Stockholders' Equity [Roll Forward]
Net income		1,911.4			1,878.3			1,878.3	33.1
Other comprehensive income (loss)		0.5				58.3		58.3	(57.8)
Dividends on common stock		(1,176.1)			(1,176.1)			(1,176.1)
Distributions to noncontrolling interests		(15.7)							(15.7)
Share-based compensation		44.0		44.0				44.0
Issuance of treasury shares for stock option and award plans		(14.3)		3.4			(17.7)	(14.3)
Investments by noncontrolling interests		278.7							278.7
Other equity transactions		(1.8)		0.2	(2.0)			(1.8)
Ending balance at Jun. 30, 2024		16,687.0	249.4	1,238.1	17,989.9	(2,391.1)	(1,985.0)	15,101.3	1,585.7
Beginning balance at Mar. 31, 2024		16,334.9	249.4	1,215.7	17,690.0	(2,275.9)	(1,965.8)	14,913.4	1,421.5
Stockholders' Equity [Roll Forward]
Net income		708.9			696.6			696.6	12.3
Other comprehensive income (loss)		(97.4)				(115.2)		(115.2)	17.8
Dividends on common stock		(393.6)			(393.6)			(393.6)
Distributions to noncontrolling interests		(2.0)							(2.0)
Share-based compensation		14.5		14.5				14.5
Issuance of treasury shares for stock option and award plans		(11.3)		7.9			(19.2)	(11.3)
Investments by noncontrolling interests		136.1							136.1
Other equity transactions		(3.1)			(3.1)			(3.1)
Ending balance at Jun. 30, 2024		$ 16,687.0	$ 249.4	$ 1,238.1	$ 17,989.9	$ (2,391.1)	$ (1,985.0)	$ 15,101.3	$ 1,585.7

[1] Includes noncash activity for conversion of shareholder loans to equity in the NEOM Green Hydrogen Company joint venture.

[2] Includes noncash activity for conversion of shareholder loans to equity in the NEOM Green Hydrogen Company joint venture.