Consolidated Comprehensive Income Statements - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ (354.4)	$ 3,862.4	$ 2,338.6
Other Comprehensive Income, net of tax:
Translation adjustments, net of tax	(95.6)	381.5	151.1
Net (loss) gain on derivatives, net of tax	40.0	(159.5)	369.2
Pension and postretirement benefits, net of tax	(32.3)	32.0	(8.9)
Reclassification adjustments:
Currency translation adjustment	5.7	(1.5)	(0.3)
Derivatives, net of tax	41.2	(33.7)	(43.9)
Pension and postretirement benefits, net of tax	46.0	55.9	53.8
Total Other Comprehensive Income	5.0	274.7	521.0
Comprehensive Income (Loss)	(349.4)	4,137.1	2,859.6
Net Income Attributable to Noncontrolling Interests	40.1	34.2	38.4
Other Comprehensive Income (Loss) Attributable to Noncontrolling Interests	65.1	(147.0)	184.3
Comprehensive Income (Loss) Attributable to Air Products	$ (454.6)	$ 4,249.9	$ 2,636.9