Consolidated Comprehensive Income Statements (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net Income	$ 549.6	$ 486.7
Other Comprehensive Income (Loss), net of tax
Translation adjustments, net of tax	40.6	415.7
Net gain (loss) on derivatives, net of tax	(0.5)	13.8
Reclassification adjustments:
Derivatives, net of tax	18.7	(1.3)
Pension and postretirement benefits, net of tax	16.0	18.3
Total Other Comprehensive Income	74.8	446.5
Comprehensive Income	624.4	933.2
Net (Loss) Income Attributable to Noncontrolling Interests	(10.8)	4.7
Other Comprehensive Income Attributable to Noncontrolling Interests	11.2	19.7
Comprehensive Income Attributable to Air Products	$ 624.0	$ 908.8