Retirement Benefits (Tables)

12 Months Ended

Sep. 30, 2017

Compensation and Retirement Disclosure [Abstract]

Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets

The following table summarizes the benefit obligation, fair value of the plan assets and the funded status at September 30, 2017:

	2017
(In millions)
Change in benefit obligation:
Benefit obligation at September 30, 2016	$	—
Converted on October 1, 2016	26.5
Service cost	2.3
Interest cost	0.6
Actuarial gain	(4.9		)
Benefits paid	(1.2		)
Foreign currency impact	(0.5		)
Benefit obligation at end of year	$	22.8
Change in plan assets:
Fair value of plan assets at September 30, 2016	$	—
Converted on October 1, 2016	3.0
Employer contributions	5.0
Benefits paid	(1.2		)
Fair value of plan assets at September 30, 2017	$	6.8
Funded status:
Plan assets less than benefit obligation - Net amount recognized	$	(16.0	)

Schedule of Amounts Recognized in Balance Sheet

Amounts recognized in the annual consolidated balance sheets consist of:

	2017
(In millions)
Non-current liabilities	$	(16.0	)
Accumulated other comprehensive loss, net of taxes	(2.2		)

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year

Amounts recognized in accumulated other comprehensive loss, net of tax consist of:

	2017
(In millions)
Balance at September 30, 2016	$	—
Converted on October 1, 2016	(6.2		)
Net loss amortized during the year	0.4
Net gain during the year	3.7
Non-controlling interest	(0.1		)
Balance at September 30, 2017	$	(2.2	)

Schedule of Net Benefit Costs

The components of net periodic pension costs for our defined benefit pension plans are as follows:

	2017
(In millions)
Service cost	$	2.3
Interest cost	0.6
Expected return on plan assets	(0.1		)
Actuarial loss amortization	0.5
Net periodic pension cost	$	3.3

Schedule of Assumptions Used

Assumptions used in determining the benefit obligation and net periodic pension cost for the year ended September 30, 2017 are presented in the following table as weighted-averages:

	2017
(In millions)
Benefit obligations:
Discount rate	3.2	%
Rate of compensation increase	4.1	%
Net Periodic Pension Cost:
Discount rate	2.3	%
Rate of compensation increase	4.9	%
Expected rate of return on plan	2.0	%

The calculation of the fair value of market-based restricted stock units during the three months ended December 31, 2016 used the following assumptions:

(In percentages)
Expected volatility	28.7	%
Risk-free interest rate	1.4	%

Schedule of Allocation of Plan Assets

The fair value of our pension plan assets, by asset category utilizing the fair value hierarchy discussed in Note 13, is as follows:

	2017
(In millions)
Other investments (Level 2)	$	4.1
Insurance contract (Level 3)	2.7
Total	$	6.8

Schedule of Expected Benefit Payments

We expect to make contributions of approximately $0.4 million during 2018. The expected future benefit payments related to the defined benefit plans are shown below.

	Payments
(In millions)
2018	$	0.8
2019	0.9
2020	1.0
2021	1.1
2022	1.2
2023-2027	11.6

Defined Contribution Plan Disclosures

The following table summarizes our defined contribution expense:

	2017		2016		2015
(In millions)
Defined contribution expense	$	11.0	$	5.5	$	4.5