Consolidated Comprehensive Income Statement - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Other Comprehensive Income (Loss), net of tax [Abstract]
Net Income	$ 333.2	$ 323.5	$ 967.6	$ 914.1
Translation adjustments, net of tax	73.0	108.0	(403.5)	53.8
Net gain (loss) on derivatives, net of tax	(13.6)	(16.9)	(37.8)	0.8
Pension and postretirement benefits, net of tax	2.0	0.0	(2.6)	0.0
Reclassification Adjustments [Abstract]
Derivatives, net of tax	1.6	0.9	32.7	(21.8)
Pension and postretirement benefits, net of tax	22.2	20.3	71.7	60.9
Total Other Comprehensive Income (Loss)	85.2	112.3	(339.5)	93.7
Comprehensive Income	418.4	435.8	628.1	1,007.8
Net income attributable to noncontrolling interests	14.4	9.5	34.2	26.4
Other Comprehensive Income (Loss) Attributable to Noncontrolling Interests	1.5	2.2	(3.0)	(2.4)
Comprehensive Income Attributable to Air Products	$ 402.5	$ 424.1	$ 596.9	$ 983.8