Plant and Equipment, Net (Tables)

12 Months Ended

Sep. 30, 2025

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	2025	2024
Land		$343.0	$312.1
Buildings	30 years	1,766.1	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 progress		13,456.8	11,190.2
Plant and equipment, at cost		$42,754.8	$39,950.9
Less: Accumulated depreciation		17,417.0	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.