Consolidated Income Statements (Unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Sales		$ 2,216.3	$ 2,187.7	$ 4,471.0	$ 4,411.7
Cost of sales		1,460.1	1,474.7	2,946.7	3,018.7
Facility closure		0.0	0.0	0.0	29.0
Selling and administrative		201.7	190.0	403.4	379.6
Research and development		19.2	16.9	36.9	31.9
Company headquarters relocation income (expense)		33.8	0.0	33.8	0.0
Other income (expense), net		8.1	10.4	20.4	19.0
Operating Income		577.2	516.5	1,138.2	971.5
Equity affiliates' income		88.2	46.2	146.4	99.1
Interest expense		19.3	35.4	38.0	72.7
Other non-operating income (expense), net		7.1	13.7	16.2	32.2
Income From Continuing Operations Before Taxes		653.2	541.0	1,262.8	1,030.1
Income tax provision		148.5	107.5	269.2	239.6
Income From Continuing Operations		504.7	433.5	993.6	790.5
Loss from discontinued operations, net of tax		(14.3)	0.0	(14.3)	0.0
Net Income		490.4	433.5	979.3	790.5
Less: Net income attributable to noncontrolling interests of continuing operations		12.6	12.2	25.9	21.7
Net Income Attributable to Air Products		477.8	421.3	953.4	768.8
Net income from continuing operations		492.1	421.3	967.7	768.8
Net loss from discontinued operations		$ (14.3)	$ 0.0	$ (14.3)	$ 0.0
Basic earnings per share from continuing operations (in dollars per share)	[1]	$ 2.22	$ 1.91	$ 4.38	$ 3.49
Basic earnings per share from discontinued operations (in dollars per share)	[1]	(0.06)	0	(0.06)	0
Basic Earnings Per Common Share Attributable to Air Products (in dollars per share)	[1]	2.16	1.91	4.31	3.49
Diluted earnings per share from continuing operations (in dollars per share)	[1]	2.21	1.90	4.36	3.48
Diluted earnings per share from discontinued operations (in dollars per share)	[1]	(0.06)	0	(0.06)	0
Diluted Earnings Per Common Share Attributable to Air Products (in dollars per share)	[1]	$ 2.15	$ 1.90	$ 4.29	$ 3.48
Weighted Average Common Shares - Basic (in millions)		221.2	220.2	221.0	220.0
Weighted Average Common Shares - Diluted (in millions)		222.3	221.4	222.2	221.2

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