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Acquisitions (Narrative) (Details)
$ in Millions, ¥ in Billions
12 Months Ended
Apr. 26, 2018
USD ($)
Apr. 26, 2018
CNY (¥)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2018
CNY (¥)
Apr. 26, 2018
CNY (¥)
Property, Plant and Equipment [Line Items]              
Plant and equipment, net [1]     $ 9,923.7 $ 8,440.2 $ 8,259.7    
Additions to plant and equipment     1,568.4 1,039.7 $ 907.7    
Equity issued related to asset acquisition     227.4        
Long-term debt – related party     384.3 [2] 0.0 [2]   ¥ 2.6  
Liability for expected cash payments to or on behalf of related party     330.0 0.0   ¥ 2.2 ¥ 2.3
Business Acquisition [Line Items]              
Business combinations, goodwill acquired during period     $ 78.0 $ 3.5      
Joint Venture [Member] | Air Products Lu An Changzhi Co Ltd [Member]              
Property, Plant and Equipment [Line Items]              
Ownership interest by Air Products (percent) 60.00%           60.00%
Ownership interest by noncontrolling owners (percent) 40.00%           40.00%
Contribution of equipment to joint venture $ 300.0            
Plant and equipment, net 1,500.0            
Additions to plant and equipment 235.0 ¥ 1.5          
Equity issued related to asset acquisition 227.0 1.4          
Air Products Lu An Changzhi Co Ltd [Member] | Joint Venture [Member]              
Property, Plant and Equipment [Line Items]              
Consideration transferred in asset acquisition $ 1,200.0 ¥ 7.9          
Lu'An Loan To Joint Venture | Loans Payable [Member]              
Property, Plant and Equipment [Line Items]              
Long-term debt – related party | ¥             ¥ 2.6
Interest rate, stated percentage 5.50%           5.50%
2018 Business Combinations              
Business Acquisition [Line Items]              
Number of business combinations completed in period     8        
Business combinations, aggregate purchase price, net of cash acquired     $ 355.4        
Business combinations, plant and equipment acquired during the period     178.4        
Business combinations, goodwill acquired during period     78.0        
Business combinations, tax deductible goodwill     17.7        
Business combinations, recognized identifiable intangible assets     $ 105.8        
Acquired finite-lived intangible assets, weighted-average useful life     12 years        
[1] Long-lived assets include plant and equipment, net.
[2] Refer to Note 6, Acquisitions, for additional information regarding related party debt.