Business and Asset Actions - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Restructuring and Related Activities [Abstract]
Business and asset actions, including equity affiliate income			$ 2,958.8
Business and asset actions, including equity affiliate income, attributable to Air Products after tax			2,306.0
Restructuring Charges	$ 24.1	$ 0.0	2,952.0	$ 57.0
Business and asset actions, attributable to Air Products after tax	$ 15.4			$ 43.8
Business and asset actions, attributable to noncontrolling interest			$ 3.5