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Plant and Equipment, Net (Major Classes of Plant and Equipment) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Property, Plant and Equipment [Line Items]      
Plant and equipment, at cost $ 39,950.9 $ 32,746.3  
Less: Accumulated depreciation 16,580.0 15,274.2  
Plant and equipment, net 23,370.9 17,472.1 $ 14,160.5
Land      
Property, Plant and Equipment [Line Items]      
Plant and equipment, at cost 312.1 320.8  
Buildings      
Property, Plant and Equipment [Line Items]      
Plant and equipment, at cost $ 1,730.7 1,543.7  
Useful life (in years) 30 years    
Production facilities      
Property, Plant and Equipment [Line Items]      
Plant and equipment, at cost $ 21,245.2 19,593.1  
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 $ 5,472.7 5,129.6  
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 $ 11,190.2 $ 6,159.1