Consolidated Income Statements (Unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Sales		$ 2,065.2	$ 2,224.0	$ 6,536.2	$ 6,635.7
Cost of sales		1,344.9	1,466.0	4,291.6	4,484.7
Facility closure		0.0	0.0	0.0	29.0
Selling and administrative		176.9	188.5	580.3	568.1
Research and development		19.9	18.1	56.8	50.0
Cost reduction actions		0.0	25.5	0.0	25.5
Gain on exchange of equity affiliate investments		0.0	29.1	0.0	29.1
Company headquarters relocation income (expense)		0.0	0.0	33.8	0.0
Other income (expense), net		15.7	14.7	36.1	33.7
Operating Income		539.2	569.7	1,677.4	1,541.2
Equity affiliates' income		51.2	56.4	197.6	155.5
Interest expense		32.1	34.2	70.1	106.9
Other non-operating income (expense), net		8.1	17.6	24.3	49.8
Income From Continuing Operations Before Taxes		566.4	609.5	1,829.2	1,639.6
Income tax provision		109.3	109.3	378.5	348.9
Income From Continuing Operations		457.1	500.2	1,450.7	1,290.7
Loss from discontinued operations, net of tax		0.0	0.0	(14.3)	0.0
Net Income		457.1	500.2	1,436.4	1,290.7
Net income attributable to noncontrolling interests of continuing operations		10.6	12.2	36.5	33.9
Net Income Attributable to Air Products		446.5	488.0	1,399.9	1,256.8
Net Income Attributable to Air Products
Net income from continuing operations		446.5	488.0	1,414.2	1,256.8
Net loss from discontinued operations		0.0	0.0	(14.3)	0.0
Net Income Attributable to Air Products		$ 446.5	$ 488.0	$ 1,399.9	$ 1,256.8
Basic Earnings Per Common Share Attributable to Air Products
Basic earnings per share from continuing operations (in dollars per share)	[1]	$ 2.02	$ 2.21	$ 6.40	$ 5.71
Basic earnings per share from discontinued operations (in dollars per share)	[1]	0	0	(0.06)	0
Basic Earnings Per Common Share Attributable to Air Products (in dollars per share)	[1]	2.02	2.21	6.33	5.71
Diluted Earnings Per Common Share Attributable to Air Products
Diluted earnings per share from continuing operations (in dollars per share)	[1]	2.01	2.20	6.36	5.68
Diluted earnings per share from discontinued operations (in dollars per share)	[1]	0	0	(0.06)	0
Diluted Earnings Per Common Share Attributable to Air Products (in dollars per share)	[1]	$ 2.01	$ 2.20	$ 6.30	$ 5.68
Weighted Average Common Shares - Basic (in millions)		221.2	220.6	221.1	220.2
Weighted Average Common Shares - Diluted (in millions)		222.4	221.9	222.3	221.4

[1] Earnings per share ("EPS") is calculated independently for each component and may not sum to total EPS due to rounding.