Consolidated Comprehensive Income Statements (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net Income	$ 486.7	$ 488.9
Other Comprehensive Income (Loss), net of tax:
Translation adjustments, net of tax	415.7	264.0
Net gain (loss) on derivatives, net of tax	13.8	22.1
Reclassification adjustments:
Derivatives, net of tax	(1.3)	(3.6)
Pension and postretirement benefits, net of tax	18.3	19.7
Total Other Comprehensive Income	446.5	302.2
Comprehensive Income	933.2	791.1
Net Income Attributable to Noncontrolling Interests	4.7	13.3
Other Comprehensive Income Attributable to Noncontrolling Interests	19.7	15.2
Comprehensive Income Attributable to Air Products	$ 908.8	$ 762.6