Consolidated Statements of Equity (Unaudited) - USD ($) $ in Millions		Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	AOCL		Treasury Stock	Air Products Share-holders' Equity	Non-controlling Interests
Beginning balance at Sep. 30, 2023		$ 15,660.3	$ 249.4	$ 1,190.5	$ 17,289.7	$ (2,449.4)	[1]	$ (1,967.3)	$ 14,312.9	$ 1,347.4
Stockholders' Equity [Roll Forward]
Net income (loss)		1,202.5			1,181.7				1,181.7	20.8
Other comprehensive income (loss)		97.9				173.5	[1]		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],[2]	(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)	[2]	(1,966.1)	14,873.0	1,256.1
Stockholders' Equity [Roll Forward]
Net income (loss)		580.9			572.4				572.4	8.5
Other comprehensive income (loss)		(93.1)				(155.6)	[2]		(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	[3]	108.1								108.1
Other equity transactions		1.2		0.1	1.1				1.2	0.0
Ending balance at Mar. 31, 2024		16,334.9	249.4	1,215.7	17,690.0	(2,275.9)	[1],[2]	(1,965.8)	14,913.4	1,421.5
Beginning balance at Sep. 30, 2024		18,673.7	249.4	1,253.2	19,545.7	(2,027.7)	[1]	(1,984.1)	17,036.5	1,637.2
Stockholders' Equity [Roll Forward]
Net income (loss)		(1,087.7)			(1,113.2)				(1,113.2)	25.5
Other comprehensive income (loss)		(391.6)				(450.0)	[1]		(450.0)	58.4
Dividends on common stock		(792.1)			(792.1)				(792.1)
Distributions to noncontrolling interests		(1.4)								(1.4)
Share-based compensation		51.0		51.0					51.0
Issuance of treasury shares for stock option and award plans		(25.7)		(12.8)				(12.9)	(25.7)
Investments by noncontrolling interests		362.4								362.4
Purchase of noncontrolling interests		(5.9)								(5.9)
Other equity transactions		(3.1)			(3.1)				(3.1)
Ending balance at Mar. 31, 2025		16,779.6	249.4	1,291.4	17,637.3	(2,477.7)	[1],[2]	(1,997.0)	14,703.4	2,076.2
Beginning balance at Dec. 31, 2024		18,738.7	249.4	1,260.9	19,767.3	(2,586.2)	[2]	(1,999.1)	16,692.3	2,046.4
Stockholders' Equity [Roll Forward]
Net income (loss)		(1,737.5)			(1,730.6)				(1,730.6)	(6.9)
Other comprehensive income (loss)		63.8				108.5	[2]		108.5	(44.7)
Dividends on common stock		(398.3)			(398.3)				(398.3)
Share-based compensation		36.7		36.7					36.7
Issuance of treasury shares for stock option and award plans		(3.9)		(6.0)				2.1	(3.9)
Investments by noncontrolling interests		81.4								81.4
Other equity transactions		(1.3)		(0.2)	(1.1)				(1.3)
Ending balance at Mar. 31, 2025		$ 16,779.6	$ 249.4	$ 1,291.4	$ 17,637.3	$ (2,477.7)	[1],[2]	$ (1,997.0)	$ 14,703.4	$ 2,076.2

[1] (A)Accumulated other comprehensive loss

[2] Accumulated other comprehensive loss

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