Consolidated Income Statements (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Consolidated Income Statements [Abstract]
Sales	$ 2,581.9	$ 2,484.2	$ 5,127.4	$ 5,046.6
Cost of sales	1,917.6	1,813.6	3,783.5	3,713.7
Selling and administrative	263.4	266.6	544.3	534.8
Research and development	33.2	32.3	66.7	65.6
Other income (expense), net	17.0	18.0	37.4	29.6
Operating Income	384.7	389.7	770.3	762.1
Equity affiliates' income	30.4	39.8	68.6	81.2
Interest expense	31.5	35.2	64.8	71.0
Income from Continuing Operations before Taxes	383.6	394.3	774.1	772.3
Income tax provision	92.1	95.8	186.6	188.0
Income from Continuing Operations	291.5	298.5	587.5	584.3
Income from Discontinued Operations, net of tax	0	1.1	3.1	2.5
Net Income	291.5	299.6	590.6	586.8
Less: Net Income Attributable to Noncontrolling Interests	8.0	9.2	16.9	18.1
Net Income Attributable to Air Products	283.5	290.4	573.7	568.7
Net Income Attributable to Air Products
Income from continuing operations	283.5	289.3	570.6	566.2
Income from discontinued operations	0	1.1	3.1	2.5
Net Income Attributable to Air Products	$ 283.5	$ 290.4	$ 573.7	$ 568.7
Basic Earnings Per Common Share Attributable to Air Products
Income from continuing operations	$ 1.33	$ 1.38	$ 2.69	$ 2.71
Income from discontinued operations	$ 0	$ 0.01	$ 0.01	$ 0.01
Net Income Attributable to Air Products	$ 1.33	$ 1.39	$ 2.70	$ 2.72
Diluted Earnings Per Common Share Attributable to Air Products
Income from continuing operations	$ 1.32	$ 1.37	$ 2.66	$ 2.67
Income from discontinued operations	$ 0	$ 0.01	$ 0.01	$ 0.01
Net Income Attributable to Air Products	$ 1.32	$ 1.38	$ 2.67	$ 2.68
Weighted Average Common Shares - Basic (in millions)	212.4	208.4	212.1	209.2
Weighted Average Common Shares - Diluted (in millions)	214.9	211.0	214.6	211.8
Dividends Declared Per Common Share - Cash	$ 0.77	$ 0.71	$ 1.48	$ 1.35