Consolidated Income Statements (Unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Sales		$ 3,189.3	$ 2,604.7	$ 9,128.6	$ 7,481.9
Cost of sales		2,342.1	1,801.9	6,717.3	5,179.8
Facility closure		0.0	0.0	0.0	23.2
Selling and administrative		216.9	213.3	676.7	626.3
Research and development		24.8	23.2	71.8	67.8
Gain on exchange with joint venture partner		0.0	0.0	0.0	36.8
Other income (expense), net		21.9	10.8	49.5	43.1
Operating Income		627.4	577.1	1,712.3	1,664.7
Equity affiliates' income		116.1	63.2	384.7	202.3
Interest expense		32.7	35.6	95.5	108.4
Other non-operating income (expense), net		10.5	21.1	42.2	56.5
Income From Continuing Operations Before Taxes		721.3	625.8	2,043.7	1,815.1
Income tax provision		134.2	101.7	370.2	337.5
Income From Continuing Operations		587.1	524.1	1,673.5	1,477.6
Income from discontinued operations, net of tax		0.0	8.2	0.0	18.5
Net Income		587.1	532.3	1,673.5	1,496.1
Net income (loss) attributable to noncontrolling interests of continuing operations		5.0	(1.3)	0.5	7.4
Net Income Attributable to Air Products		582.1	533.6	1,673.0	1,488.7
Net Income Attributable to Air Products
Net income from continuing operations		582.1	525.4	1,673.0	1,470.2
Net income from discontinued operations		0.0	8.2	0.0	18.5
Net Income Attributable to Air Products		$ 582.1	$ 533.6	$ 1,673.0	$ 1,488.7
Per Share Data
Basic EPS from continuing operations (in dollars per share)	[1]	$ 2.62	$ 2.37	$ 7.54	$ 6.63
Basic EPS from discontinued operations (in dollars per share)	[1]	0	0.04	0	0.08
Basic EPS Attributable to Air Products (in dollars per share)	[1]	2.62	2.41	7.54	6.72
Diluted EPS from continuing operations (in dollars per share)	[1]	2.62	2.36	7.52	6.61
Diluted EPS from discontinued operations (in dollars per share)	[1]	0	0.04	0	0.08
Diluted EPS Attributable to Air Products (in dollars per share)	[1]	$ 2.62	$ 2.40	$ 7.52	$ 6.69
Weighted Average Common Shares (in millions)
Basic		222.0	221.6	222.0	221.6
Diluted		222.5	222.5	222.5	222.5

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