Consolidated Comprehensive Income Statements (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 724.8	$ (1,737.5)	$ 1,416.2	$ (1,087.7)
Other Comprehensive Income (Loss), net of tax:
Translation adjustments, net of tax	(105.5)	102.3	(32.0)	(521.7)
Net gain on derivatives, net of tax	(0.9)	(45.0)	34.6	20.7
Reclassification adjustments:
Currency translation adjustment	0.0	2.5	0.0	2.5
Derivatives, net of tax	16.3	(7.0)	32.9	84.9
Pension and postretirement benefits, net of tax	9.9	11.0	19.2	22.0
Total Other Comprehensive Income (Loss)	(80.2)	63.8	54.7	(391.6)
Comprehensive Income (Loss)	644.6	(1,673.7)	1,470.9	(1,479.3)
Net income (loss) attributable to noncontrolling interests	14.4	(6.9)	27.6	25.5
Other Comprehensive Income (Loss) Attributable to Noncontrolling Interests	0.2	(44.7)	24.4	58.4
Comprehensive Income (Loss) Attributable to Air Products	$ 630.0	$ (1,622.1)	$ 1,418.9	$ (1,563.2)