Retirement Benefits (Tables)

9 Months Ended

Jun. 30, 2017

Compensation and Retirement Disclosure [Abstract]

Components of Net Period Pension Costs

The components of net periodic pension costs for Versum’s defined benefit pension plans are as follows:

	Three Months Ended June 30, 2017		Nine Months Ended June 30, 2017
(In millions)
Service cost	$	0.6	$	1.7
Interest cost	0.1		0.4
Actuarial loss amortization	0.2		0.4
Net periodic pension cost	$	0.9	$	2.5

Defined Contribution Expense

The following table summarizes our defined contribution expense:

	Three Months Ended June 30,				Nine Months Ended June 30,
	2017		2016		2017		2016
(In millions)
Defined contribution expense	$	2.1	$	1.4	$	5.8	$	4.1