XML 90 R73.htm IDEA: XBRL DOCUMENT v3.20.2
Plant and Equipment, Net (Major Classes of Plant and Equipment) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Property, Plant and Equipment [Line Items]      
Plant and equipment, at cost $ 25,176.2 $ 22,333.7  
Less: Accumulated depreciation 13,211.5 11,996.1  
Plant and equipment, net 11,964.7 10,337.6 $ 9,923.7
Land      
Property, Plant and Equipment [Line Items]      
Plant and equipment, at cost 296.8 281.5  
Buildings      
Property, Plant and Equipment [Line Items]      
Plant and equipment, at cost $ 997.8 946.8  
Useful life (in years) 30 years    
Production facilities      
Property, Plant and Equipment [Line Items]      
Plant and equipment, at cost $ 17,289.7 15,602.1  
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 $ 4,807.7 4,491.9  
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 $ 1,784.2 $ 1,011.4