Consolidated Income Statements - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Consolidated Income Statements [Abstract]
Sales	$ 2,271.2	$ 2,414.5	$ 4,627.0	$ 4,975.3
Cost of sales	1,519.0	1,698.2	3,114.7	3,527.9
Selling and administrative	207.1	240.3	418.5	497.9
Research and development	32.7	35.8	64.7	70.8
Business separation costs	7.4	0.0	19.4	0.0
Business restructuring and cost reduction actions	8.6	55.4	8.6	87.8
Pension settlement loss	2.6	12.6	2.6	12.6
Gain on previously held equity interest	0.0	0.0	0.0	17.9
Other income (expense), net	19.5	4.7	25.4	13.0
Operating Income	513.3	376.9	1,023.9	809.2
Equity affiliates' income	32.5	33.0	66.2	76.1
Interest expense	25.7	23.4	47.9	52.5
Income from Continuing Operations before Taxes	520.1	386.5	1,042.2	832.8
Income tax provision	132.5	87.7	268.4	194.8
Income from Continuing Operations	387.6	298.8	773.8	638.0
Income (loss) from Discontinued Operations, net of tax	(853.1)	(1.9)	(867.3)	(3.6)
Net Income (Loss)	(465.5)	296.9	(93.5)	634.4
Less: Net Income Attributable to Noncontrolling Interests	7.8	6.9	16.2	19.8
Net Income (Loss) Attributable to Air Products	(473.3)	290.0	(109.7)	614.6
Net Income (Loss) Attributable to Air Products
Income from continuing operations	379.8	291.9	757.6	618.2
Income (loss) from discontinued operations	(853.1)	(1.9)	(867.3)	(3.6)
Net Income (Loss) Attributable to Air Products	$ (473.3)	$ 290.0	$ (109.7)	$ 614.6
Basic Earnings Per Common Share Attributable to Air Products
Income from continuing operations	$ 1.76	$ 1.36	$ 3.51	$ 2.89
Income (loss) from discontinued operations	(3.95)	(0.01)	(4.02)	(0.02)
Net Income (Loss) Attributable to Air Products	(2.19)	1.35	(0.51)	2.87
Diluted Earnings Per Common Share Attributable to Air Products
Income from continuing operations	1.74	1.34	3.47	2.85
Income (loss) from discontinued operations	(3.91)	(0.01)	(3.98)	(0.02)
Net Income (Loss) Attributable to Air Products	$ (2.17)	$ 1.33	$ (0.51)	$ 2.83
Weighted Average Common Shares - Basic (in millions)	216.1	214.9	215.9	214.5
Weighted Average Common Shares - Diluted (in millions)	217.9	217.4	217.8	217.0
Dividends Declared Per Common Share - Cash	$ 0.86	$ 0.81	$ 1.67	$ 1.58