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Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Retirement Benefits [Abstract]  
Schedule of Changes in Projected Benefit Obligation and Plan Assets, and Net Funded Status
The benefit obligations and plan assets, changes to the benefit obligations and plan assets, and the funded status of the defined benefit pension plans were as follows:
 
United States
 
Germany
 
As of December 31,
 
As of December 31,
 
2017
 
2016
 
2017
 
2016
 
(In millions)
Change in benefit obligation
 
 
 
 
 
 
 
Benefit obligation, beginning of year
$
64.9

 
$
72.8

 
$
24.1

 
$
22.8

Interest cost
2.5

 
2.9

 
0.4

 
0.6

Actuarial (gain) loss
2.5

 
1.1

 
(0.1
)
 
2.5

Benefits paid
(2.5
)
 
(2.3
)
 
(1.0
)
 
(0.9
)
Settlement payments
(3.7
)
 
(9.6
)
 
—

 
—

Foreign exchange rate changes
—

 
—

 
3.4

 
(0.9
)
Projected benefit obligation, end of year
$
63.7

 
$
64.9

 
$
26.8

 
$
24.1

Change in plan assets
 
 
 
 
 
 
 
Fair value of plan assets, beginning of year
$
49.8

 
$
59.1

 
$
15.2

 
$
18.6

Actual return on plan assets
4.8

 
2.5

 
1.1

 
0.7

Foreign exchange rate changes
—

 
—

 
2.1

 
(0.5
)
Company contributions
0.4

 
0.1

 
0.1

 
(2.7
)
Benefits paid
(2.5
)
 
(2.3
)
 
(1.0
)
 
(0.9
)
Settlement payments
(3.7
)
 
(9.6
)
 
—

 
—

Fair value of plan assets, end of year
48.8

 
49.8

 
17.5

 
15.2

Funded status of the plan, end of year
$
(14.9
)
 
$
(15.1
)
 
$
(9.3
)
 
$
(8.9
)
Schedule of Amounts Recognized in Balance Sheet
Amounts recognized in our Consolidated Balance Sheets consisted of the following:
 
United States
 
Germany
 
As of December 31,
 
As of December 31,
 
2017
 
2016
 
2017
 
2016
 
(In millions)
Noncurrent liabilities
(14.9
)
 
(15.1
)
 
(9.3
)
 
(8.9
)
Accumulated other comprehensive loss — pre-tax
18.9

 
19.3

 
9.8

 
9.4
Schedule of Amounts Recognized in Other Comprehensive Loss
Pre-tax amounts recognized in accumulated other comprehensive loss consisted of the following:
 
United States
 
Germany
 
As of December 31,
 
As of December 31,
 
2017
 
2016
 
2017
 
2016
 
(In millions)
Net actuarial loss
$
18.9

 
$
19.3

 
$
9.8

 
$
9.4

Total
$
18.9

 
$
19.3

 
$
9.8

 
$
9.4
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets
The following table includes information for pension plans with an accumulated benefit obligation in excess of plan assets.
 
United States
 
Germany
 
As of December 31,
 
As of December 31,
 
2017
 
2016
 
2017
 
2016
 
(In millions)
Projected benefit obligation, end of year
$
63.7

 
$
64.9

 
$
26.8

 
$
24.1

Accumulated benefit obligation, end of year
63.7

 
64.9

 
26.8

 
24.1

Plan assets at fair value, end of year
48.8

 
49.8

 
17.5

 
15.2
Schedule of Net Benefit Costs
Components of net periodic pension cost included the following:
 
United States
 
Germany
 
Years Ended December 31,
 
Years Ended December 31,
 
2017
 
2016
 
 
2017
 
2016
 
 
(In millions)
Interest cost
2.5

 
2.9

 
 
0.4

 
0.6

 
Expected return on plan assets
(3.3
)
 
(3.8
)
 
 
(0.6
)
 
(0.6
)
 
Amortization of net actuarial loss
0.3

 
0.4

 
 
0.4

 
0.2

 
Net periodic pension cost (credit)
(0.5
)
 
(0.5
)
 
 
0.2

 
0.2

 
Settlements and curtailments
1.1

 
2.9

 
 


 
—

 
Total pension cost
$
0.6

 
$
2.4

 
 
$
0.2

 
$
0.2

 
Schedule of Assumptions Used
Assumptions used to determine benefit obligations were as follows:
 
United States
 
Germany
 
As of December 31,
 
As of December 31,
 
2017
 
2016
 
2017
 
2016
Discount rate
3.50
%
 
4.00
%
 
1.56
%
 
1.60
%
Rate of compensation increase
—
%
 
—
%
 
—
%
 
—
%
Assumptions used to determine net periodic benefit costs were as follows:
 
United States
 
Germany
 
As of December 31,
 
As of December 31,
 
2017
 
2016
 
 
2017
 
2016
 
Discount rate
4.00
%
 
4.25
%
 
 
1.56
%
 
1.60
%
 
Expected return on plan assets
6.50
%
 
6.50
%
 
 
3.50
%
 
3.50
%
 
Rate of compensation increase
—
%
 
—
%
 
 
—
%
 
—
%
 
Schedule of Allocation of Plan Assets
The plans' asset allocations by asset category were as follows:
 
United States
 
International
 
As of December 31,
 
As of December 31,
 
2017
 
2016
 
2017
 
2016
Short-term investments
1
%
 
1
%
 
—
%
 
—
%
Fixed income securities
27
%
 
60
%
 
—
%
 
—
%
Equity securities
72
%
 
39
%
 
—
%
 
—
%
Insurance contracts
—
%
 
—
%
 
100
%
 
100
%
Total
100
%
 
100
%
 
100
%
 
100
%
Schedule of Expected Benefit Payments
As of December 31, 2017, the following reflects estimated future benefit payments in each of the next five years and in the aggregate for the five years thereafter:
 
United States
 
International
 
(In millions)
2018
$14.7
 
$1.0
2019
3.9
 
1.1
2020
4.1
 
1.1
2021
4.4
 
1.1
2022
4.1
 
1.2
2022-2026
18.6
 
5.9
Schedule of Fair Value of Plan Assets
The fair value of the plan assets by asset category were as follows:
United States
December 31, 2017
 
Quoted Prices in Active Markets for Identical Assets
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Unobservable Inputs
(Level 3)
 
(In millions)
Short-term investments
 
 
 
 
 
 
 
Money market securities
$
0.5

 
$
0.5

 
$
—

 
$
—

Mutual Funds

 
 
 
 
 
 
Equity securities
 
 
 
 
 
 
 
Large-cap growth funds *
19.0

 
—

 
—

 
—

International growth fund *
15.7

 
—

 
—

 
—

Common stocks
0.6

 
0.6

 
—

 
—

Commingled trust funds *
13.0

 
—

 
—

 
—

Total
$
48.8

 
$
1.1

 
$
—

 
$
—

* In accordance with ASC 820-10, certain investments that are measured at fair value using the net asset value (NAV) per share (or its equivalent) as a practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the fair value of plan assets.
International
December 31, 2017
 
Quoted Prices in Active Markets for Identical Assets
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Unobservable Inputs
(Level 3)
 
(In millions)
Insurance contracts
17.5

 
—

 
17.5

 
—

Total
$
17.5

 
$
—

 
$
17.5

 
$
—


United States
December 31, 2016
 
Quoted Prices in Active Markets for Identical Assets
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Unobservable Inputs
(Level 3)
 
(In millions)
Short-term investments
 
 
 
 
 
 
 
Money market securities
$
0.5

 
$
0.5

 
$
—

 
$
—

Mutual Funds
 
 
 
 
 
 
 
Equity securities
 
 
 
 
 
 
 
Large-cap growth funds *
11.5

 
—

 
—

 
—

International growth fund *
3.4

 
—

 
—

 
—

Common stocks
4.3

 
4.3

 
—

 
—

Commingled trust funds *
30.1

 
—

 
—

 
—

Total
$
49.8

 
$
4.8

 
$
—

 
$
—

* In accordance with ASC 820-10, certain investments that are measured at fair value using the net asset value (NAV) per share (or its equivalent) as a practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the fair value of plan assets.

International
December 31, 2016
 
Quoted Prices in Active Markets for Identical Assets
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Unobservable Inputs
(Level 3)
 
(In millions)
Insurance contracts
15.2

 
—

 
15.2

 
—

Total
$
15.2

 
$
—

 
$
15.2

 
$
—