Consolidated Comprehensive Income Statements (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Statement of Comprehensive Income [Abstract]
Net Income	$ 691.4	$ 649.8
Other Comprehensive Income (Loss), net of tax:
Translation adjustments, net of tax	73.5	(624.0)
Net gain on derivatives, net of tax	35.5	65.7
Reclassification adjustments:
Derivatives, net of tax	16.6	91.9
Pension and postretirement benefits, net of tax	9.3	11.0
Total Other Comprehensive Income (Loss)	134.9	(455.4)
Comprehensive Income	826.3	194.4
Net income attributable to noncontrolling interests	13.2	32.4
Other Comprehensive Income Attributable to Noncontrolling Interests	24.2	103.1
Comprehensive Income Attributable to Air Products	$ 788.9	$ 58.9