Consolidated Comprehensive Income Statement (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Comprehensive Income, net of tax [Abstract]
Net Income	$ 299.6	$ 302.2	$ 586.8	$ 558.5
Translation adjustments, net of tax	(162.8)	133.9	(84.4)	95.7
Net gain (loss) on derivatives, net of tax	(2.5)	(1.1)	13.5	(10.4)
Reclassification Adjustments [Abstract]
Derivatives, net of tax	6.6	2.1	(7.7)	12.0
Pension and postretirement plans, net of tax	24.2	16.0	48.6	32.1
Total Other Comprehensive Income (Loss)	(134.5)	150.9	(30.0)	129.4
Comprehensive Income	165.1	453.1	556.8	687.9
Net income attributable to noncontrolling interests	9.2	6.2	18.1	14.4
Other Comprehensive Income Attributable to Noncontrolling Interests	(2.8)	3.4	(1.7)	4.1
Comprehensive Income Attributable to Air Products	$ 158.7	$ 443.5	$ 540.4	$ 669.4