Consolidated Comprehensive Income Statements - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 2,338.6	$ 2,266.5	$ 2,114.9
Other Comprehensive Income (Loss), net of tax:
Translation adjustments, net of tax	151.1	(1,230.5)	267.3
Net gain (loss) on derivatives, net of tax	369.2	(120.3)	3.3
Pension and postretirement benefits, net of tax	(8.9)	(112.2)	274.3
Reclassification adjustments:
Currency translation adjustment	(0.3)	7.3	0.0
Derivatives, net of tax	(43.9)	91.4	43.5
Pension and postretirement benefits, net of tax	53.8	64.8	74.6
Total Other Comprehensive Income (Loss)	521.0	(1,299.5)	663.0
Comprehensive Income	2,859.6	967.0	2,777.9
Net Income Attributable to Noncontrolling Interests	38.4	10.4	15.8
Other Comprehensive Income (Loss) Attributable to Noncontrolling Interests	184.3	(29.3)	38.8
Comprehensive Income Attributable to Air Products	$ 2,636.9	$ 985.9	$ 2,723.3