Segment and Geographic Information (Tables)

12 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Segment Reporting

	As of and for the year ended September 30,
	2018			2017			2016
(In millions)
Sales
Materials	$	885.6		$	829.7		$	756.7
Delivery Systems and Services	483.7			293.6			213.4
Corporate	3.0			3.6			—
Combined Total	$	1,372.3		$	1,126.9		$	970.1
Operating Income (Loss)
Materials	$	286.5		$	274.9		$	249.6
Delivery Systems and Services	135.5			71.7			50.8
Corporate	(27.4		)	(20.5		)	(23.3		)
Segment Total	394.6			326.1			277.1
Business separation, restructuring and cost reduction actions	(20.6		)	(25.5		)	(0.9		)
Combined Total	$	374.0		$	300.6		$	276.2
Depreciation and Amortization
Materials	$	47.7		$	43.1		$	44.4
Delivery Systems and Services	2.1			1.4			2.1
Corporate	1.0			1.5			0.4
Combined Total	$	50.8		$	46.0		$	46.9
Equity Affiliates’ Income
Materials	$	—		$	—		$	0.2
Combined Total	$	—		$	—		$	0.2
Total Assets
Materials	$	862.5		$	782.6		$	741.7
Delivery Systems and Services	144.9			110.9			104.0
Corporate	497.9			362.1			206.4
Combined Total	$	1,505.3		$	1,255.6		$	1,052.1
Expenditures for Long-Lived Assets
Materials	$	93.1		$	45.7		$	34.4
Delivery Systems and Services	1.0			1.7			0.7
Corporate	21.3			16.6			0.7
Combined Total	$	115.4		$	64.0		$	35.8

Sales by Product Group

	Year Ended September 30,
	2018		2017		2016
(In millions)
Process Materials	$	408.0	$	401.8	$	387.4
Advanced Materials	477.6		427.9		369.3
Equipment and Installations	421.1		235.4		150.8
Site Services	62.6		58.2		62.6
Corporate	3.0		3.6		—
Total	$	1,372.3	$	1,126.9	$	970.1

Geographic Information

	Year Ended September 30,
	2018		2017		2016
(In millions)
Sales to External Customers
United States	$	418.9	$	375.7	$	349.4
Taiwan	249.1		242.8		230.8
South Korea	459.5		304.1		217.2
China	94.2		64.9		53.8
Europe	61.7		63.1		57.8
Asia, excluding China, Taiwan, and South Korea	88.9		76.3		61.1
Total	$	1,372.3	$	1,126.9	$	970.1

	September 30,
	2018		2017		2016
(In millions)
Long-Lived Assets(A)
United States	$	224.0	$	170.3	$	138.3
South Korea	130.7		112.2		112.2
Taiwan	38.2		38.2		36.8
Asia, excluding Taiwan and South Korea	11.1		9.2		9.0
Europe	1.1		0.4		0.2
Total	$	405.1	$	330.3	$	296.5

^(A)  Long-lived assets include plant and equipment, net.