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Plant and Equipment, Net (Major Classes of Plant and Equipment) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Property, Plant and Equipment [Line Items]      
Plant and equipment, at cost $ 22,333.7 $ 21,490.2  
Less: Accumulated depreciation 11,996.1 11,566.5  
Plant and equipment, net [1] 10,337.6 9,923.7 $ 8,440.2
Land      
Property, Plant and Equipment [Line Items]      
Plant and equipment, at cost 281.5 269.4  
Buildings      
Property, Plant and Equipment [Line Items]      
Plant and equipment, at cost $ 946.8 988.6  
Useful life (in years) 30 years    
Production facilities      
Property, Plant and Equipment [Line Items]      
Plant and equipment, at cost [2] $ 15,602.1 15,082.8  
Production facilities | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 10 years    
Production facilities | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 20 years    
Distribution and other machinery and equipment      
Property, Plant and Equipment [Line Items]      
Plant and equipment, at cost [3] $ 4,491.9 4,400.9  
Distribution and other machinery and equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 5 years    
Distribution and other machinery and equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 25 years    
Cylinders | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 10 years    
Cylinders | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 25 years    
Tanks      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 20 years    
Customer Stations      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 7 years 6 months    
Tractors and Trailers | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 5 years    
Tractors and Trailers | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life (in years) 15 years    
Construction in progress      
Property, Plant and Equipment [Line Items]      
Plant and equipment, at cost $ 1,011.4 $ 748.5  
[1]
Long-lived assets include plant and equipment, net.
[2]
Depreciable lives of production facilities related to long-term customer supply contracts are matched to the contract lives.
[3]
The depreciable lives for various types of distribution equipment are: 10 to 25 years for cylinders, depending on the nature and properties of the product; 20 years for tanks; 7.5 years for customer stations; and 5 to 15 years for tractors and trailers.