Consolidated Comprehensive Income Statements (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net Income	$ 104.1	$ 354.1	$ 2,546.2	$ 260.6
Translation adjustments, net of tax	141.4	(89.0)	9.8	(52.0)
Net gain (loss) on derivatives, net of tax	23.0	(22.2)	(2.2)	6.6
Pension and postretirement benefits, net of tax	0.1	0.0	3.9	0.0
Reclassification adjustments:
Currency translation adjustment	8.2	(0.1)	57.3	2.7
Derivatives, net of tax	(23.6)	10.0	7.8	(20.4)
Pension and postretirement benefits, net of tax	27.7	21.6	85.2	65.4
Total Other Comprehensive Income (Loss)	176.8	(79.7)	161.8	2.3
Comprehensive Income	280.9	274.4	2,708.0	262.9
Net Income Attributable to Noncontrolling Interests	2.2	7.3	14.5	23.5
Other Comprehensive Income (Loss) Attributable to Noncontrolling Interests	0.2	(0.7)	2.1	2.1
Comprehensive Income Attributable to Air Products	$ 278.5	$ 267.8	$ 2,691.4	$ 237.3