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		1,033.7			1,012.0			1,012.0	21.7
Other comprehensive income (loss)		636.8				622.8		622.8	14.0
Dividends on common stock		(748.5)			(748.5)			(748.5)
Distributions to noncontrolling interests		(5.6)							(5.6)
Share-based compensation		29.0		29.0				29.0
Issuance of treasury shares for stock option and award plans		1.2		(7.3)			8.5	1.2
Investments by noncontrolling interests		72.8							72.8
Other equity transactions	[1]	(31.6)		0.3	(2.5)			(2.2)	(29.4)
Ending 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
Beginning balance at Dec. 31, 2022		14,517.4	249.4	1,148.4	16,731.4	(2,218.3)	(1,975.2)	13,935.7	581.7
Stockholders' Equity [Roll Forward]
Net income		449.9			439.8			439.8	10.1
Other comprehensive income (loss)		56.3				55.0		55.0	1.3
Dividends on common stock		(388.7)			(388.7)			(388.7)
Distributions to noncontrolling interests		(4.8)							(4.8)
Share-based compensation		14.8		14.8				14.8
Issuance of treasury shares for stock option and award plans		2.8		0.1			2.7	2.8
Investments by noncontrolling interests		72.8							72.8
Other equity transactions	[2]	(30.3)		0.1	(1.2)			(1.1)	(29.2)
Ending 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
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		1,202.5			1,181.7			1,181.7	20.8
Other comprehensive income (loss)		97.9				173.5		173.5	(75.6)
Dividends on common stock		(782.5)			(782.5)			(782.5)
Distributions to noncontrolling interests		(13.7)							(13.7)
Share-based compensation		29.5		29.5				29.5
Issuance of treasury shares for stock option and award plans		(3.0)		(4.5)			1.5	(3.0)
Investments by noncontrolling interests		142.6							142.6
Other equity transactions		1.3		0.2	1.1			1.3
Ending 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
Beginning balance at Dec. 31, 2023		16,129.1	249.4	1,200.0	17,510.0	(2,120.3)	(1,966.1)	14,873.0	1,256.1
Stockholders' Equity [Roll Forward]
Net income		580.9			572.4			572.4	8.5
Other comprehensive income (loss)		(93.1)				(155.6)		(155.6)	62.5
Dividends on common stock		(393.5)			(393.5)			(393.5)
Distributions to noncontrolling interests		(13.7)							(13.7)
Share-based compensation		15.7		15.7				15.7
Issuance of treasury shares for stock option and award plans		0.2		(0.1)			0.3	0.2
Investments by noncontrolling interests		108.1							108.1
Other equity transactions		1.2		0.1	1.1			1.2
Ending 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

[1] "Other equity transactions" reflects a noncash adjustment recorded during the second quarter of fiscal year 2023 to convert investments attributable to the noncontrolling partner of the NEOM Green Hydrogen Company joint venture to shareholder loans.

[2] "Other equity transactions" reflects a noncash adjustment recorded during the second quarter of fiscal year 2023 to convert investments attributable to the noncontrolling partner of the NEOM Green Hydrogen Company joint venture to shareholder loans.