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Acquisitions (Narrative) (Details) $ in Millions, ¥ in Billions					3 Months Ended		9 Months Ended
	May 01, 2019 USD ($)	Mar. 01, 2019 USD ($)	Apr. 26, 2018 USD ($)	Apr. 26, 2018 CNY (¥)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($) acquisition	May 02, 2019	Sep. 30, 2018 USD ($)	Apr. 26, 2018 CNY (¥)
Business Acquisition [Line Items]
Net gain on exchange of equity affiliate investments	$ 29.1				$ 29.1	$ 0.0	$ 29.1	$ 0.0
Business combinations, goodwill acquired during period							42.2
Plant and equipment, net					10,427.6		10,427.6			$ 9,923.7
Additions to plant and equipment							1,507.6	1,158.1
Equity issuance related to asset acquisition						$ 227.4		$ 227.4
Long-term debt – related party					321.6		321.6			384.3	¥ 2.3
Current portion of long-term debt – related party					62.9		62.9
Liability for expected cash payments to or on behalf of related party					$ 80.8		$ 80.8			$ 330.0
High-Tech Gases
Business Acquisition [Line Items]
Ownership interest (percent)									0.00%	50.00%
Decrease in ownership interest in exchange transaction (percent)	50.00%
Gain from disposition of interest in equity method investment	$ 14.1
WuXi
Business Acquisition [Line Items]
Ownership interest (percent)										50.00%
WuXi
Business Acquisition [Line Items]
Interest acquired in exchange transaction (percent)	50.00%
Ownership interest subsequent to acquisition date (percent)									100.00%
Gain from revaluation of previously held equity interest to acquisition date fair value	$ 15.0
Estimated acquisition date fair value of previously held equity interest	27.0
Business combinations, plant and equipment acquired during the period	28.0
Business combinations, intangible assets acquired during the period	$ 27.6
Weighted-average useful life of acquired intangible assets (in years)	10 years
Business combinations, goodwill acquired during period	$ 4.2
Business combinations, tax deductible goodwill	$ 0.0
ACP Europe SA
Business Acquisition [Line Items]
Business combinations, aggregate purchase price, net of cash acquired		$ 106.3
Business combinations, plant and equipment acquired during the period		74.6
Business combinations, goodwill acquired during period		38.0
Business combinations, tax deductible goodwill		$ 0.0
2018 Business Combinations
Business Acquisition [Line Items]
Number of acquisitions completed \| acquisition								8
Business combinations, aggregate purchase price, net of cash acquired								$ 355.4
Joint Venture \| Air Products Lu'an Changzhi Co Ltd
Business Acquisition [Line Items]
Ownership interest by Air Products (percent)			60.00%								60.00%
Contribution of equipment to joint venture			$ 300.0
Additions to plant and equipment			235.0	¥ 1.5
Equity issuance related to asset acquisition			$ 227.0	1.4
Loans Payable \| Lu'An Loan To Joint Venture
Business Acquisition [Line Items]
Loan to joint venture, face amount \| ¥											¥ 2.6
Interest rate, stated percentage			5.50%								5.50%
Air Products Lu'an Changzhi Co Ltd \| Joint Venture
Business Acquisition [Line Items]
Consideration transferred in asset acquisition			$ 1,200.0	¥ 7.9
Plant and equipment, net			$ 1,500.0