Consolidated Comprehensive Income Statements - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net Income	$ 2,266.5	$ 2,114.9	$ 1,931.1
Other Comprehensive (Loss) Income, net of tax:
Translation adjustments, net of tax	(1,230.5)	267.3	233.4
Net gain (loss) on derivatives, net of tax	(120.3)	3.3	43.5
Pension and postretirement benefits, net of tax	(112.2)	274.3	(68.2)
Reclassification adjustments:
Currency translation adjustment	7.3	0.0	0.0
Derivatives, net ox tax	91.4	43.5	(57.7)
Pension and postretirement benefits, net of tax	64.8	74.6	82.5
Total Other Comprehensive (Loss) Income	(1,299.5)	663.0	233.5
Comprehensive Income	967.0	2,777.9	2,164.6
Net Income Attributable to Noncontrolling Interests	10.4	15.8	44.4
Other Comprehensive (Loss) Income Attributable to Noncontrolling Interests	(29.3)	38.8	(2.0)
Comprehensive Income Attributable to Air Products	$ 985.9	$ 2,723.3	$ 2,122.2