Consolidated Comprehensive Income Statement (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Other Comprehensive Income (Loss), net of tax [Abstract]
Net Income	$ 287.2	$ 256.3
Translation adjustments, net of tax	78.4	(38.2)
Net gain (loss) on derivatives, net of tax	16.0	(9.3)
Pension and postretirement benefits, net of tax	0	0
Reclassification Adjustments [Abstract]
Currency translation adjustment	0	0
Derivatives, net of tax	(14.3)	9.9
Pension and postretirement benefits, net of tax	24.4	16.1
Total Other Comprehensive Income (Loss)	104.5	(21.5)
Comprehensive Income	391.7	234.8
Net income attributable to noncontrolling interests	8.9	8.2
Other Comprehensive Income Attributable to Noncontrolling Interests	1.1	0.7
Comprehensive Income Attributable to Air Products	$ 381.7	$ 225.9