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	583.8			572.2			572.2	11.6
Other comprehensive income (loss)	580.5				567.8		567.8	12.7
Dividends on common stock	(359.8)			(359.8)			(359.8)
Dividends to noncontrolling interests	(0.8)							(0.8)
Share-based compensation	14.2		14.2				14.2
Issuance of treasury shares for stock option and award plans	(1.6)		(7.4)			5.8	(1.6)
Other equity transactions	(1.3)		0.2	(1.3)			(1.1)	(0.2)
Ending 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]
Common Stock, Dividends, Per Share, Declared	$ 1.62
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	621.6			609.3			609.3	12.3
Other comprehensive income (loss)	191.0				329.1		329.1	(138.1)
Dividends on common stock	(389.0)			(389.0)			(389.0)
Share-based compensation	13.8		13.8				13.8
Issuance of treasury shares for stock option and award plans	(3.2)		(4.4)			1.2	(3.2)
Investments by noncontrolling interests	34.5							34.5
Other equity transactions	0.1		0.1	0.0			0.1	0.0
Ending 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]
Common Stock, Dividends, Per Share, Declared	$ 1.75