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Plant and Equipment, Net
 12 Months Ended
Sep. 30, 2019
Property, Plant and Equipment [Abstract]  
Plant and Equipment, Net PLANT AND EQUIPMENT, NET
The major classes of plant and equipment are as follows:
30 September
 
Useful Life
in years
 
2019

 
2018

Land
 
 
 
 
 

$281.5

 

$269.4

Buildings
 
 
 
30
 
946.8

 
988.6

Production facilities(A)
 
10
to
20
 
15,602.1

 
15,082.8

Distribution and other machinery and equipment(B)
 
5
to
25
 
4,491.9

 
4,400.9

Construction in progress
 
 
 
 
 
1,011.4

 
748.5

Plant and equipment, at cost
 
 
 
 
 
22,333.7

 
21,490.2

Less: Accumulated depreciation
 
 
 
 
 
11,996.1

 
11,566.5

Plant and equipment, net
 
 
 
 
 

$10,337.6

 

$9,923.7

(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.
Depreciation expense was $1,049.7, $940.7, and $843.2 in fiscal years 2019, 2018, and 2017, respectively.