Consolidated Comprehensive Income Statement - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Other Comprehensive Income (Loss), net of tax [Abstract]
Net Income	$ 372.0	$ 337.5
Translation adjustments, net of tax	(102.9)	(244.4)
Net gain (loss) on derivatives, net of tax	16.0	(23.8)
Pension and postretirement benefits, net of tax	0.0	0.0
Reclassification Adjustments [Abstract]
Currency translation adjustment	2.4	0.0
Derivatives, net of tax	(19.3)	13.5
Pension and postretirement benefits, net of tax	21.1	20.9
Total Other Comprehensive Income (Loss)	(82.7)	(233.8)
Comprehensive Income	289.3	103.7
Net income attributable to noncontrolling interests	8.4	12.9
Other Comprehensive Income (Loss) Attributable to Noncontrolling Interests	0.0	(5.1)
Comprehensive Income Attributable to Air Products	$ 280.9	$ 95.9