Consolidated Comprehensive Income Statements - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net Income	$ 3,862.4	$ 2,338.6	$ 2,266.5
Other Comprehensive Income (Loss), net of tax:
Translation adjustments, net of tax	381.5	151.1	(1,230.5)
Net (loss) gain on derivatives, net of tax	(159.5)	369.2	(120.3)
Pension and postretirement benefits, net of tax	32.0	(8.9)	(112.2)
Reclassification adjustments:
Currency translation adjustment	(1.5)	(0.3)	7.3
Derivatives, net of tax	(33.7)	(43.9)	91.4
Pension and postretirement benefits, net of tax	55.9	53.8	64.8
Total Other Comprehensive Income (Loss)	274.7	521.0	(1,299.5)
Comprehensive Income	4,137.1	2,859.6	967.0
Net Income Attributable to Noncontrolling Interests	34.2	38.4	10.4
Other Comprehensive (Loss) Income Attributable to Noncontrolling Interests	(147.0)	184.3	(29.3)
Comprehensive Income Attributable to Air Products	$ 4,249.9	$ 2,636.9	$ 985.9