Consolidated Income Statements (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Sales	$ 2,224.0	$ 2,216.6
Cost of sales	1,544.0	1,571.8
Facility closure	29.0	0.0
Selling and administrative	189.6	191.6
Research and development	15.0	14.6
Other income (expense), net	8.6	22.1
Operating Income	455.0	460.7
Equity affiliates' income	52.9	13.8
Interest expense	37.3	29.8
Other non-operating income (expense), net	18.5	9.8
Income From Continuing Operations Before Taxes	489.1	454.5
Income tax provision	132.1	291.8
Income From Continuing Operations	357.0	162.7
Loss From Discontinued Operations, net of tax	0.0	(1.0)
Net Income	357.0	161.7
Net Income Attributable to Noncontrolling Interests of Continuing Operations	9.5	7.1
Net Income Attributable to Air Products	347.5	154.6
Net Income Attributable to Air Products
Income from continuing operations	347.5	155.6
Loss from discontinued operations	0.0	(1.0)
Net Income Attributable to Air Products	$ 347.5	$ 154.6
Basic Earnings Per Common Share Attributable to Air Products
Income from continuing operations, basic (in dollars per share)	$ 1.58	$ 0.71
Income (Loss) from discontinued operations, basic (in dollars per share)	0	0
Net Income Attributable to Air Products (in dollars per share)	1.58	0.71
Diluted Earnings Per Common Share Attributable to Air Products
Income from continuing operations, diluted (in dollars per share)	1.57	0.70
Income (Loss) from discontinued operations, diluted (in dollars per share)	0	0
Net Income Attributable to Air Products (in dollars per share)	$ 1.57	$ 0.70
Weighted Average Common Shares - Basic (in millions)	219.9	218.9
Weighted Average Common Shares - Diluted (in millions)	221.0	220.4