Consolidated Comprehensive Income Statement (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Comprehensive Income, net of tax [Abstract]
Net Income	$ 298.4	$ 492.5	$ 885.2	$ 1,051.0
Translation adjustments, net of tax	(99.8)	(150.6)	(184.2)	(54.9)
Net gain (loss) on derivatives, net of tax	12.0	(3.7)	25.5	(14.1)
Pension and postretirement benefits, net of tax	5.8	0	5.8	0
Reclassification Adjustments [Abstract]
Currency translation adjustment	(0.6)	13.3	(0.6)	13.3
Derivatives, net of tax	(2.1)	(2.2)	(9.8)	9.8
Pension and postretirement plans, net of tax	27.1	16.1	75.7	48.2
Total Other Comprehensive Income (Loss)	(57.6)	(127.1)	(87.6)	2.3
Comprehensive Income	240.8	365.4	797.6	1,053.3
Net income attributable to noncontrolling interests	10.0	8.0	28.1	22.4
Other Comprehensive Income Attributable to Noncontrolling Interests	(1.4)	(1.4)	(3.1)	2.7
Comprehensive Income Attributable to Air Products	$ 232.2	$ 358.8	$ 772.6	$ 1,028.2