Consolidated Comprehensive Income Statement (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Comprehensive Income, net of tax [Abstract]
Net Income	$ 291.5	$ 299.6	$ 590.6	$ 586.8
Translation adjustments, net of tax	(85.6)	(162.8)	(54.2)	(84.4)
Net gain (loss) on derivatives, net of tax	4.6	(2.5)	17.7	13.5
Pension and postretirement benefits, net of tax	0	0	0	0
Reclassification Adjustments [Abstract]
Currency translation adjustment	0	0	0	0
Derivatives, net of tax	(10.8)	6.6	(22.7)	(7.7)
Pension and postretirement benefits, net of tax	20.6	24.2	40.6	48.6
Total Other Comprehensive Income (Loss)	(71.2)	(134.5)	(18.6)	(30.0)
Comprehensive Income	220.3	165.1	572.0	556.8
Net income attributable to noncontrolling interests	8.0	9.2	16.9	18.1
Other Comprehensive Income (Loss) Attributable to Noncontrolling Interests	(3.5)	(2.8)	(4.6)	(1.7)
Comprehensive Income Attributable to Air Products	$ 215.8	$ 158.7	$ 559.7	$ 540.4