Consolidated Income Statements - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2015		Sep. 30, 2014		Sep. 30, 2013
Consolidated Income Statements [Abstract]
Sales	$ 9,894.9		$ 10,439.0		$ 10,180.4
Cost of sales	6,944.1		7,634.6		7,472.1
Selling and administrative	941.7		1,059.3		1,066.3
Research and development	138.8		141.4		133.7
Business restructuring and cost reduction actions	207.7	[1]	12.7	[1]	231.6
Pension settlement loss	21.2	[2]	5.5	[2]	12.4
Goodwill and intangible asset impairment charge	0.0		310.1	[3]	0.0
Business separation costs	7.5	[4]	0.0		0.0
Gain on previously held equity interest	17.9	[5]	0.0		0.0
Advisory costs	0.0		0.0		10.1
Other income (expense), net	47.3		52.8		70.2
Operating Income	1,699.1		1,328.2		1,324.4
Equity affiliates' income	154.5		151.4		167.8
Interest expense	103.5		125.1		141.8
Loss on early retirement of debt	16.6	[6]	0.0		0.0
Income from Continuing Operations before Taxes	1,733.5		1,354.5		1,350.4
Income tax provision	415.9		366.0		307.9
Income from Continuing Operations	1,317.6		988.5		1,042.5
Income (loss) from Discontinued Operations, net of tax	0.0		4.6		(10.0)
Net Income	1,317.6		993.1		1,032.5
Less: Net Income Attributable to Noncontrolling Interests	39.7		1.4		38.3
Net Income Attributable to Air Products	1,277.9		991.7		994.2
Net Income Attributable to Air Products
Income from continuing operations	1,277.9		987.1		1,004.2
Income (loss) from discontinued operations	0.0		4.6		(10.0)
Net Income Attributable to Air Products	$ 1,277.9		$ 991.7		$ 994.2
Basic Earnings Per Common Share Attributable to Air Products
Income from continuing operations	$ 5.95		$ 4.64		$ 4.79
Income (loss) from discontinued operations	0		0.02		(0.05)
Net Income Attributable to Air Products	5.95		4.66		4.74
Diluted Earnings Per Common Share Attributable to Air Products
Income from continuing operations	5.88		4.59		4.73
Income (loss) from discontinued operations	0		0.02		(0.05)
Net Income Attributable to Air Products	$ 5.88		$ 4.61		$ 4.68
Weighted Average Common Shares Outstanding - Basic (in millions)	214.9		212.7		209.7
Weighted Average Common Shares Outstanding - Diluted (in millions)	217.3		215.2		212.3

[1] For additional information, see Note 5, Business Restructuring and Cost Reduction Actions.

[2] For additional information, see Note 16, Retirement Benefits.

[3] For additional information, see Note 10, Goodwill, and Note 11, Intangible Assets.

[4] For additional information, see Note 3, Materials Technologies Separation.

[5] For additional information, see Note 6, Business Combinations.

[6] For additional information, see Note 15, Debt.