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Plant and Equipment, Net (Tables)
12 Months Ended
Sep. 30, 2018
Property, Plant and Equipment [Abstract]  
Schedule of Major Classes of Plant and Equipment The major classes of plant and equipment are as follows:
30 September
 
Useful Life
in years
 
2018

 
2017

Land
 
 
 
 
 

$269.4

 

$231.0

Buildings
 
 
 
30
 
988.6

 
977.8

Production facilities(A)
 
10
to
20
 
15,082.8

 
13,577.1

Distribution and other machinery and equipment(B)
 
5
to
25
 
4,400.9

 
3,944.0

Construction in progress
 
 
 
 
 
748.5

 
817.9

Plant and equipment, at cost
 
 
 
 
 
21,490.2

 
19,547.8

Less: Accumulated depreciation
 
 
 
 
 
11,566.5

 
11,107.6

Plant and equipment, net
 
 
 
 
 

$9,923.7

 

$8,440.2

(A) 
Depreciable lives of production facilities related to long-term customer supply contracts are matched to the contract lives.
(B) 
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.