Consolidated Income Statements - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Consolidated Income Statements [Abstract]
Sales	$ 2,355.8	$ 2,560.8
Cost of sales	1,598.0	1,831.0
Selling and administrative	212.0	258.2
Research and development	32.4	35.4
Business separation costs	12.0	0.0
Project suspension costs	14.3	0.0
Business restructuring and cost reduction actions	0.0	32.4
Gain on previously held equity interest	0.0	17.9
Other income (expense), net	5.9	8.3
Operating Income	493.0	430.0
Equity affiliates' income	33.7	43.1
Interest expense	22.2	29.1
Income from Continuing Operations before Taxes	504.5	444.0
Income tax provision	132.5	106.5
Income from Continuing Operations	372.0	337.5
Income (loss) from Discontinued Operations, net of tax	0.0	0.0
Net Income	372.0	337.5
Less: Net Income Attributable to Noncontrolling Interests	8.4	12.9
Net Income Attributable to Air Products	363.6	324.6
Net Income Attributable to Air Products
Income from continuing operations	363.6	324.6
Income (loss) from discontinued operations	0.0	0.0
Net Income Attributable to Air Products	$ 363.6	$ 324.6
Basic Earnings Per Common Share Attributable to Air Products
Income from continuing operations	$ 1.68	$ 1.52
Income (loss) from discontinued operations	0	0
Net Income Attributable to Air Products	1.68	1.52
Diluted Earnings Per Common Share Attributable to Air Products
Income from continuing operations	1.67	1.5
Income (loss) from discontinued operations	0	0
Net Income Attributable to Air Products	$ 1.67	$ 1.5
Weighted Average Common Shares Outstanding - Basic (in millions)	215.8	214.2
Weighted Average Common Shares Outstanding - Diluted (in millions)	217.6	216.6
Dividends Declared Per Common Share - Cash	$ 0.81	$ 0.77