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Plant and Equipment, Net
 12 Months Ended
Sep. 30, 2025
Property, Plant and Equipment [Abstract]  
Plant and Equipment, Net PLANT AND EQUIPMENT, NET
The major classes of plant and equipment are as follows:
30 SeptemberUseful life20252024
Land$343.0 $312.1 
Buildings30 years1,766.1 1,730.7 
Production facilities(A)
10-20 years
21,412.9 21,245.2 
Distribution and other machinery and equipment(B)
5-25 years
5,776.0 5,472.7 
Construction in progress13,456.8 11,190.2 
Plant and equipment, at cost$42,754.8 $39,950.9 
Less: Accumulated depreciation17,417.0 16,580.0 
Plant and equipment, net$25,337.8 $23,370.9 
(A)Depreciable lives of production facilities related to long-term customer supply contracts are generally 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; generally 7.5 years for customer stations; and 5 to 15 years for tractors and trailers.
Depreciation expense was $1,526.9, $1,419.6, and $1,325.8 in fiscal years 2025, 2024, and 2023, respectively.