Consolidated Income Statements (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012		Mar. 31, 2013	Mar. 31, 2012
Consolidated Income Statements [Abstract]
Sales	$ 2,484.2	$ 2,344.3		$ 5,046.6	$ 4,665.8
Cost of sales	1,813.6	1,715.8		3,713.7	3,438.1
Selling and administrative	266.6	237.3		534.8	468.4
Research and development	32.3	29.8		65.6	57.8
Business restructuring and cost reduction plans	0	86.8	[1]	0	86.8	[1]
Other income, net	18.0	13.3		29.6	27.0
Operating Income	389.7	287.9		762.1	641.7
Equity affiliates' income	39.8	35.5		81.2	72.6
Interest expense	35.2	29.4		71.0	58.8
Income from Continuing Operations before Taxes	394.3	294.0		772.3	655.5
Income tax provision	95.8	8.8		188.0	136.2
Income from Continuing Operations	298.5	285.2		584.3	519.3
Income from Discontinued Operations, net of tax	1.1	17.0		2.5	39.2
Net Income	299.6	302.2		586.8	558.5
Less: Net Income Attributable to Noncontrolling Interests	9.2	6.2		18.1	14.4
Net Income Attributable to Air Products	290.4	296.0		568.7	544.1
Net Income Attributable to Air Products
Income from continuing operations	289.3	279.0		566.2	504.9
Income from discontinued operations	1.1	17.0		2.5	39.2
Net Income Attributable to Air Products	$ 290.4	$ 296.0		$ 568.7	$ 544.1
Basic Earnings Per Common Share Attributable to Air Products
Income from continuing operations	$ 1.38	$ 1.32		$ 2.71	$ 2.39
Income from discontinued operations	$ 0.01	$ 0.08		$ 0.01	$ 0.19
Net Income Attributable to Air Products	$ 1.39	$ 1.40		$ 2.72	$ 2.58
Diluted Earnings Per Common Share Attributable to Air Products
Income from continuing operations	$ 1.37	$ 1.30		$ 2.67	$ 2.36
Income from discontinued operations	$ 0.01	$ 0.08		$ 0.01	$ 0.18
Net Income Attributable to Air Products	$ 1.38	$ 1.38		$ 2.68	$ 2.54
Weighted Average Common Shares - Basic (in millions)	208.4	211.1		209.2	210.7
Weighted Average Common Shares - Diluted (in millions)	211.0	215.0		211.8	214.5
Dividends Declared Per Common Share - Cash	$ 0.71	$ 0.64		$ 1.35	$ 1.22

[1] Information about how this charge related to the businesses at the segment level is discussed in Note 4, Business Restructuring and Cost Reduction Plans.