Summary By Quarter (Unaudited)

12 Months Ended

Sep. 30, 2016

Quarterly Financial Information Disclosure [Abstract]

Summary By Quarter (Unaudited)

These tables summarize the unaudited results of operations for each quarter of fiscal 2016 and 2015:

	For the Quarter Ended
	December 31, 2015			March 31, 2016			June 30, 2016		September 30, 2016		Total
(In millions)
Sales	$	245.5		$	233.5		$	242.7	$	248.4	$	970.1
Cost of sales	132.4			132.5			135.9		138.7		539.5
Selling and administrative	23.6			25.7			27.3		33.2		109.8
Research and development	10.9			10.2			11.3		11.5		43.9
Business separation, restructuring and cost reduction actions	(0.9		)	(1.8		)	1.1		2.5		0.9
Other income (expense), net	1.1			1.0			0.3		0.5		2.9
Operating Income	80.6			67.9			67.4		63.0		278.9
Equity affiliates’ income	0.2			—			—		—		0.2
Interest expense	—			—			—		0.4		0.4
Income Before Taxes	80.8			67.9			67.4		62.6		278.7
Income tax provision	13.4			12.2			17.6		15.6		58.8
Net Income	67.4			55.7			49.8		47.0		219.9
Less: Net Income Attributable to Non-controlling Interests	2.2			1.9			2.0		1.8		7.9
Net Income Attributable to Versum	$	65.2		$	53.8		$	47.8	$	45.2	$	212.0

	For the Quarter Ended
	December 31, 2014			March 31, 2015		June 30, 2015		September 30, 2015		Total
(In millions)
Sales	$	255.1		$	258.8	$	263.0	$	232.4	$	1,009.3
Cost of sales	164.7			158.6		153.5		139.7		616.5
Selling and administrative	26.8			27.8		28.4		26.6		109.6
Research and development	9.1			10.0		9.9		11.7		40.7
Business separation, restructuring and cost reduction actions	4.2			1.7		8.6		7.1		21.6
Other income (expense), net	(0.7		)	0.7		0.5		0.6		1.1
Operating Income	49.6			61.4		63.1		47.9		222.0
Equity affiliates’ income	0.3			0.4		—		0.3		1.0
Interest expense	0.1			—		—		—		0.1
Income Before Taxes	49.8			61.8		63.1		48.2		222.9
Income tax provision	6.1			11.2		10.8		3.6		31.7
Net Income	43.7			50.6		52.3		44.6		191.2
Less: Net Income Attributable to Non-controlling Interests	1.8			1.8		2.1		1.4		7.1
Net Income Attributable to Versum	$	41.9		$	48.8	$	50.2	$	43.2	$	184.1