Consolidated Income Statements (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Sales	$ 2,254.7	$ 2,224.0
Cost of sales	1,486.6	1,544.0
Facility closure	0.0	29.0
Selling and administrative	201.7	189.6
Research and development	17.7	15.0
Other income (expense), net	12.3	8.6
Operating Income	561.0	455.0
Equity affiliates' income	58.2	52.9
Interest expense	18.7	37.3
Other non-operating income (expense), net	9.1	18.5
Income Before Taxes	609.6	489.1
Income tax provision	120.7	132.1
Net Income	488.9	357.0
Net income attributable to noncontrolling interests	13.3	9.5
Net Income Attributable to Air Products	$ 475.6	$ 347.5
Basic Earnings Per Common Share Attributable to Air Products (in dollars per share)	$ 2.15	$ 1.58
Diluted Earnings Per Common Share Attributable to Air Products (in dollars per share)	$ 2.14	$ 1.57
Weighted Average Common Shares - Basic (in millions)	220.9	219.9
Weighted Average Common Shares - Diluted (in millions)	222.2	221.0