Consolidated Comprehensive Income Statements (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Statement of Comprehensive Income [Abstract]
Net Income	$ 723.2	$ 708.9	$ (364.5)	$ 1,911.4
Other Comprehensive Income (Loss), net of tax:
Translation adjustments, net of tax	528.4	(140.2)	6.7	16.6
Net gain (loss) on derivatives, net of tax	40.9	13.5	61.6	(65.3)
Reclassification adjustments:
Currency translation adjustment	3.3	0.0	5.8	0.0
Derivatives, net of tax	(52.2)	15.5	32.7	8.1
Pension and postretirement benefits, net of tax	11.5	13.8	33.5	41.1
Net current period other comprehensive income (loss)	531.9	(97.4)	140.3	0.5
Comprehensive Income	1,255.1	611.5	(224.2)	1,911.9
Net income attributable to noncontrolling interests	9.4	12.3	34.9	33.1
Other Comprehensive Income Attributable to Noncontrolling Interests	24.0	17.8	82.4	(57.8)
Comprehensive Income Attributable to Air Products	$ 1,221.7	$ 581.4	$ (341.5)	$ 1,936.6