Consolidated Comprehensive Income Statements (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ (1,422.3)	$ 723.2	$ (6.1)	$ (364.5)
Other Comprehensive Income, net of tax:
Translation adjustments, net of tax	40.4	528.4	8.4	6.7
Net gain on derivatives, net of tax	42.5	40.9	77.1	61.6
Reclassification adjustments:
Currency translation adjustment	0.0	3.3	0.0	5.8
Derivatives, net of tax	(2.7)	(52.2)	30.2	32.7
Pension and postretirement benefits, net of tax	8.9	11.5	28.1	33.5
Total Other Comprehensive Income	89.1	531.9	143.8	140.3
Comprehensive Income (Loss)	(1,333.2)	1,255.1	137.7	(224.2)
Net Income Attributable to Noncontrolling Interests	18.5	9.4	46.1	34.9
Other Comprehensive Income Attributable to Noncontrolling Interests	21.7	24.0	46.1	82.4
Comprehensive Income (Loss) Attributable to Air Products	$ (1,373.4)	$ 1,221.7	$ 45.5	$ (341.5)