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Retirement Benefits (Tables)
 12 Months Ended
Sep. 30, 2018
Retirement Benefits [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, 2018 and 2017:
 
2018
 
2017
(In millions)
 
 
 
Change in benefit obligation:
 
 
 
Benefit obligation at beginning of year
$
22.8

 
$
—

Converted on October 1, 2016
—

 
26.5

Service cost
2.0

 
2.3

Interest cost
0.7

 
0.6

Actuarial loss (gain)
1.3

 
(4.9
)
Benefits paid
(0.8
)
 
(1.2
)
Other
0.7

 
—

Foreign currency impact
0.4

 
(0.5
)
Benefit obligation at end of year
$
27.1

 
$
22.8

Change in plan assets:
 
 
 
Fair value of plan assets at beginning of year
$
6.8

 
$
—

Converted on October 1, 2016
—

 
3.0

Employer contributions
0.8

 
5.0

Benefits paid
(0.8
)
 
(1.2
)
  Foreign currency impact
0.1

 
—

Fair value of plan assets at end of year
$
7.1

 
$
6.8

Funded status:
 
 
 
Plan assets less than benefit obligation - Net amount recognized
$
(20.0
)
 
$
(16.0
)
Schedule of Amounts Recognized in Balance Sheet
Amounts recognized in the annual consolidated balance sheets consist of:
 
2018
 
2017
(In millions)
 
 
 
Non-current liabilities
$
(20.0
)
 
$
(16.0
)
Accumulated other comprehensive loss, net of taxes
(3.4
)
 
(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:
 
2018
 
2017
(In millions)
 
 
 
Balance at beginning of year
$
(2.2
)
 
$
—

Converted on October 1, 2016
—

 
(6.2
)
Net actuarial loss amortized during the year
0.1

 
0.4

Net actuarial (loss) gain during the year
(1.4
)
 
3.7

Non-controlling interest
0.1

 
(0.1
)
Balance at end of year
$
(3.4
)
 
$
(2.2
)
Schedule of Net Benefit Costs
The components of net periodic pension costs for our defined benefit pension plans are as follows:
 
2018
 
2017
(In millions)
 
 
 
Service cost
$
2.0

 
$
2.3

Interest cost
0.7

 
0.6

Expected return on plan assets
(0.1
)
 
(0.1
)
Actuarial loss amortization
0.1

 
0.5

Net periodic pension cost
$
2.7

 
$
3.3
Schedule of Assumptions Used
Assumptions used in determining the benefit obligation and net periodic pension cost for the years ended September 30, 2018 and 2017 are presented in the following table as weighted-averages:
 
2018
 
2017
(In millions)
 
 
 
Benefit obligations:
 
 
 
       Discount rate
2.9
%
 
3.2
%
       Rate of compensation increase
4.1
%
 
4.1
%
Net Periodic Pension Cost:
 
 
 
       Discount rate
3.3
%
 
2.3
%
       Rate of compensation increase
4.1
%
 
4.9
%
       Expected rate of return on plan
1.7
%
 
2.0
%
The calculation of the fair value of market-based restricted stock units during the years ended September 30, 2018 and 2017 used the following assumptions:
 
Year Ended September 30,
 
2018
 
2017
(In percentages)
 
 
 
Expected volatility
28.0
%
 
28.7
%
Risk-free interest rate
1.9
%
 
1.4
%
Expected dividend yield
0.5
%
 
—
%
Schedule of Allocation of Plan Assets
The fair value of our pension plan assets at September 30, 2018 and 2017, by asset category utilizing the fair value hierarchy discussed in Note 13, is as follows:
 
2018
 
2017
(In millions)
 
 
 
Other investments (Level 2)
$
4.4

 
$
4.1

Insurance contract (Level 3)
2.7

 
2.7

Total
$
7.1

 
$
6.8
Schedule of Expected Benefit Payments
We expect to make contributions of approximately $0.1 million during 2019. The expected future benefit payments related to the defined benefit plans are shown below:
 
Payments
(In millions)
 
2019
$
0.9

2020
1.0

2021
1.1

2022
1.3

2023
1.6

2024-2028
10.7
Defined Contribution Plan Disclosures
The following table summarizes our defined contribution expense:
 
2018
 
2017
 
2016
(In millions)
 
 
 
 
 
Defined contribution expense
$
12.4

 
$
11.0

 
$
5.5