Accumulated Other Comprehensive Loss (Reclassification) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other (income) expense, net	$ (3.7)		$ (16.1)		$ (41.1)		$ (45.7)
Interest expense	31.3		35.4		96.1		106.4
Net Income Attributable to Air Products	(314.0)		(288.4)		(887.7)		(857.1)
Income (Loss) from discontinued operations, net of tax	0		0.6		3.1		3.1
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | (Gain) Loss on Cash Flow Hedges [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Sales/cost of sales	(1.2)		0		(0.2)		0.7
Other (income) expense, net	2.7		(2.5)		(20.3)		(10.5)
Interest expense	(0.6)		0.4		(1.3)		0
Net Income Attributable to Air Products	0.9		(2.1)		(21.8)		(9.8)
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Pension and postretirement benefits [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net Income Attributable to Air Products	20.3	[1]	27.1	[1]	60.9	[1]	75.7	[1]
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Accumulated Translation Adjustment [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income (Loss) from discontinued operations, net of tax	$ 0	[2]	$ (0.6)	[2]	$ 0	[2]	$ (0.6)	[2]

[1] The components include prior service cost amortization, actuarial loss amortization, and settlements and are reflected in net periodic benefit cost. Refer to Note 10, Retirement Benefits.

[2] The impact is reflected in Income from Discontinued Operations, net of tax.