Consolidated Comprehensive Income Statements (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net Income	$ 649.8	$ 621.6
Other Comprehensive (Loss) Income, net of tax:
Translation adjustments, net of tax	(624.0)	380.6
Net gain (loss) on derivatives, net of tax	65.7	(161.1)
Reclassification adjustments:
Derivatives, net of tax	91.9	(42.2)
Pension and postretirement benefits, net of tax	11.0	13.7
Net current period other comprehensive income (loss)	(455.4)	191.0
Comprehensive Income	194.4	812.6
Net Income Attributable to Noncontrolling Interests	32.4	12.3
Other Comprehensive Income (Loss) Attributable to Noncontrolling Interests	103.1	(138.1)
Comprehensive Income Attributable to Air Products	$ 58.9	$ 938.4