Plant and Equipment, Net (Tables)

12 Months Ended

Sep. 30, 2017

Property, Plant and Equipment [Abstract]

Major Classes of Plant and Equipment

The major classes of plant and equipment are as follows:

	September 30,
	Useful Life in years	2017		2016
(In millions, except useful life)
Land		$	21.8	$	21.9
Buildings	30	149.3		147.1
Machinery and Equipment
Production facilities	10 to 15	479.9		433.6
Distribution and other(A)	5 to 25	252.1		255.9
Total machinery and equipment		732.0		689.5
Construction in progress		52.1		26.2
Plant and equipment, at cost		955.2		884.7
Less: accumulated depreciation		624.9		588.2
Plant and equipment, net		$	330.3	$	296.5

^(A)  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, and generally 20 years for other distribution equipment such as tanks and trailers.