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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |
Schedule of components of period benefit costs | The components of period benefit costs for the years ended December 31, 2017, 2016 and 2015 are as follows:
|  | US Pension Plans |  |  | Non-US Pension Plans |  |  | Postretirement Health and Other |
(in millions) |  | 2017 |  |  | 2016 |  |  | 2015 |  |  | 2017 |  |  | 2016 |  |  | 2015 |  |  | 2017 |  |  | 2016 |  |  | 2015 |
Service cost - benefits earned during the year |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1.9 |  |  | $ | 1.7 |  |  | $ | 2.6 |  |  | $ | 0.3 |  |  | $ | 0.3 |  |  | $ | 0.4 |
Interest cost of projected benefit obligation |  |  | 5.3 |  |  |  | 6.8 |  |  |  | 9.4 |  |  |  | 2.1 |  |  |  | 2.5 |  |  |  | 8.9 |  |  |  | 1.0 |  |  |  | 1.7 |  |  |  | 2.0 |
Expected return on assets |  |  | (4.9 | ) |  |  | (5.7 | ) |  |  | (9.0 | ) |  |  | (1.5 | ) |  |  | (1.8 | ) |  |  | (7.4 | ) |  |  | — |  |  |  | — |  |  |  | — |
Amortization of prior service cost |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.1 |  |  |  | 0.1 |  |  |  | 0.1 |  |  |  | (1.4 | ) |  |  | — |  |  |  | — |
Amortization of actuarial net loss (gain) |  |  | 3.2 |  |  |  | 3.6 |  |  |  | 5.1 |  |  |  | 1.6 |  |  |  | 1.0 |  |  |  | 2.3 |  |  |  | 0.4 |  |  |  | — |  |  |  | 0.1 |
Curtailment gain recognized |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net periodic benefit cost |  | $ | 3.6 |  |  | $ | 4.7 |  |  | $ | 5.5 |  |  | $ | 4.2 |  |  | $ | 3.5 |  |  | $ | 6.5 |  |  | $ | 0.3 |  |  | $ | 2.0 |  |  | $ | 2.5 |
Weighted average assumptions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  | 4.2 | % |  |  | 4.5 | % |  |  | 4.1 | % |  |  | 2.1 | % |  |  | 2.9 | % |  |  | 3.3 | % |  |  | 3.8 | % |  |  | 4.2 | % |  |  | 3.7 | %
Expected return on plan assets |  |  | 4.7 | % |  |  | 5.5 | % |  |  | 5.8 | % |  |  | 3.4 | % |  |  | 4.0 | % |  |  | 3.6 | % |  | N/A |  |  | N/A |  |  | N/A |
Rate of compensation increase |  | N/A |  |  | N/A |  |  | N/A |  |  |  | 2.6 | % |  |  | 2.4 | % |  |  | 3.9 | % |  | N/A |  |  | N/A |  |  |  | 1.5 | %
Reconciliation of the Changes in Benefit Obligation, the Changes in Plan Assets, and the Funded Status | The following is a reconciliation of the changes in benefit obligation, the changes in plan assets, and the funded status as of December 31, 2017 and 2016:
|  | US Pension Plans |  |  | Non-US Pension Plans |  |  | Postretirement Medical and Other |
(in millions) |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Change in Benefit Obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefit obligation, beginning of year |  | $ | 155.6 |  |  | $ | 218.5 |  |  | $ | 82.8 |  |  | $ | 252.5 |  |  | $ | 41.6 |  |  | $ | 51.8 |
Distribution of MFS |  |  | — |  |  |  | (62.4 | ) |  |  | — |  |  |  | (170.4 | ) |  |  | — |  |  |  | (10.1 | )
Service cost |  |  | — |  |  |  | — |  |  |  | 1.9 |  |  |  | 1.7 |  |  |  | 0.3 |  |  |  | 0.3 |
Interest cost |  |  | 5.3 |  |  |  | 6.8 |  |  |  | 2.1 |  |  |  | 2.5 |  |  |  | 1.0 |  |  |  | 1.7 |
Participant contributions |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1.4 |  |  |  | 1.9 |
Medicare subsidies received |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.2 |
Plan amendments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (13.8 | ) |  |  | — |
Net transfer out |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Actuarial (gain) loss |  |  | 10.0 |  |  |  | 0.9 |  |  |  | (2.2 | ) |  |  | 11.0 |  |  |  | 2.9 |  |  |  | 1.8 |
Currency translation adjustment |  |  | — |  |  |  | — |  |  |  | 9.2 |  |  |  | (9.9 | ) |  |  | — |  |  |  | — |
Benefits paid |  |  | (8.6 | ) |  |  | (8.2 | ) |  |  | (4.3 | ) |  |  | (4.6 | ) |  |  | (4.5 | ) |  |  | (6.0 | )
Benefit obligation, end of year |  | $ | 162.3 |  |  | $ | 155.6 |  |  | $ | 89.5 |  |  | $ | 82.8 |  |  | $ | 28.9 |  |  | $ | 41.6 |
Change in Plan Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets, beginning of year |  | $ | 108.6 |  |  | $ | 143.9 |  |  | $ | 41.8 |  |  | $ | 196.9 |  |  | $ | — |  |  | $ | — |
Distribution of MFS |  |  | — |  |  |  | (34.1 | ) |  |  | — |  |  |  | (147.8 | ) |  |  | — |  |  |  | — |
Actual return on plan assets |  |  | 11.5 |  |  |  | 6.4 |  |  |  | 1.1 |  |  |  | 2.7 |  |  |  | — |  |  |  | — |
Employer contributions |  |  | 4.7 |  |  |  | 0.6 |  |  |  | 2.1 |  |  |  | 2.2 |  |  |  | 3.1 |  |  |  | 3.9 |
Participant contributions |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1.4 |  |  |  | 1.9 |
Medicare subsidies received |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.2 |
Currency translation adjustment |  |  | — |  |  |  | — |  |  |  | 4.4 |  |  |  | (7.6 | ) |  |  | — |  |  |  | — |
Net transfer out |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Benefits paid |  |  | (8.6 | ) |  |  | (8.2 | ) |  |  | (4.3 | ) |  |  | (4.6 | ) |  |  | (4.5 | ) |  |  | (6.0 | )
Fair value of plan assets, end of year |  |  | 116.2 |  |  |  | 108.6 |  |  |  | 45.1 |  |  |  | 41.8 |  |  |  | — |  |  |  | — |
Funded status |  | $ | (46.1 | ) |  | $ | (47.0 | ) |  | $ | (44.4 | ) |  | $ | (41.0 | ) |  | $ | (28.9 | ) |  | $ | (41.6 | )
Amounts recognized in the Consolidated Balance sheet at December 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension asset |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Pension obligation |  |  | (46.1 | ) |  |  | (47.0 | ) |  |  | (44.4 | ) |  |  | (41.0 | ) |  |  | — |  |  |  | — |
Postretirement medical and other benefit obligations |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (28.9 | ) |  |  | (41.6 | )
Net amount recognized |  | $ | (46.1 | ) |  | $ | (47.0 | ) |  | $ | (44.4 | ) |  | $ | (41.0 | ) |  | $ | (28.9 | ) |  | $ | (41.6 | )
Weighted-Average Assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  | 3.6 | % |  |  | 4.2 | % |  |  | 2.2 | % |  |  | 2.1 | % |  |  | 3.3 | % |  |  | 3.8 | %
Expected return on plan assets |  |  | 4.7 | % |  |  | 5.5 | % |  |  | 3.4 | % |  |  | 4.0 | % |  | N/A |  |  | N/A |
Rate of compensation increase |  | N/A |  |  | N/A |  |  |  | 2.6 | % |  |  | 2.4 | % |  | N/A |  |  | N/A |
Amounts Recognized in Accumulated Other Comprehensive Income | Amounts recognized in accumulated other comprehensive income as of December 31, 2017 and 2016, consist of the following:
|  | Pensions |  |  | Postretirement Medical and Other |
(in millions) |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Net actuarial gain (loss) |  | $ | (64.2 | ) |  | $ | (65.1 | ) |  | $ | (7.6 | ) |  | $ | (5.1 | )
Prior service credit |  |  | (0.6 | ) |  |  | (0.6 | ) |  |  | 12.5 |  |  |  | — |
Total amount recognized |  | $ | (64.8 | ) |  | $ | (65.7 | ) |  | $ | 4.9 |  |  | $ | (5.1 | )
Summary of the Sensitivity of Retirement Obligations and Retirement Benefit Costs of Plans to Changes in the Key Assumptions | The following table summarizes the sensitivity of our December 31, 2017 retirement obligations and 2017 retirement benefit costs of our plans to changes in the key assumptions used to determine those results (in millions):
Change in assumption: |  | Estimated increase (decrease) in 2018 pension cost |  |  | Estimated increase (decrease) in Projected Benefit Obligation for the year ended December 31, 2017 |  |  | Estimated increase (decrease) in 2018 Other Postretirement Benefit costs |  |  | Estimated increase (decrease) in Other Postretirement Benefit Obligation for the year ended December 31, 2017 |
0.50% increase in discount rate |  | $ | (0.9 | ) |  | $ | (15.0 | ) |  | $ | (0.1 | ) |  | $ | (0.9 | )
0.50% decrease in discount rate |  |  | 0.9 |  |  |  | 16.2 |  |  |  | 0.1 |  |  |  | 0.9 |
0.50% increase in long-term return on assets |  |  | (0.8 | ) |  | N/A |  |  | N/A |  |  | N/A |
0.50% decrease in long-term return on assets |  |  | 0.8 |  |  | N/A |  |  | N/A |  |  | N/A |
1% increase in medical trend rates |  | N/A |  |  | N/A |  |  |  | 0.3 |  |  |  | 1.4 |
1% decrease in medical trend rates |  | N/A |  |  | N/A |  |  |  | (0.3 | ) |  |  | (1.3 | )
Schedule of the Actual Allocations for the Pension Assets and Target Allocations by Asset Class | The actual allocations for the pension assets at December 31, 2017, and target allocations by asset class, are as follows:
|  | Target Allocations |  | Weighted Average Asset Allocations |
|  | U.S. Plans |  |  | International Plans |  | U.S. Plans |  |  | International Plans |
Equity Securities |  |  | 50 | % |  | 0 - 25% |  |  | 48.0 | % |  |  | 35.6 | %
Debt Securities |  |  | 50 | % |  | 0 - 100% |  |  | 48.3 | % |  |  | 31.6 | %
Other |  |  | — | % |  | 0 - 100% |  |  | 3.7 | % |  |  | 32.8 | %
Schedule of Plan Assets Using the Fair Value Hierarchy | The following table presents our plan assets using the fair value hierarchy as of December 31, 2017 and 2016. The fair value hierarchy has three levels based on the reliability of the inputs used to determine fair value. Level 1 refers to fair values determined based on quoted prices in active markets for identical assets. Level 2 refers to fair values estimated using significant other observable inputs, and Level 3 includes fair values estimated using significant non-observable inputs.
|  | December 31, 2017 |
Assets (in millions) |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Unobservable Inputs (Level 3) |  |  | Net Asset Value ("NAV") |  |  | Total |
Cash |  | $ | 4.7 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 4.7 |
Insurance group annuity contracts |  |  | — |  |  |  | — |  |  |  | 14.4 |  |  |  | — |  |  |  | 14.4 |
Common/collective trust funds — Government, corporate and other non-government debt |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 70.4 |  |  |  | 70.4 |
Common/collective trust funds — Corporate equity |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 71.8 |  |  |  | 71.8 |
Total |  | $ | 4.7 |  |  | $ | — |  |  | $ | 14.4 |  |  | $ | 142.2 |  |  | $ | 161.3 |
|  | December 31, 2016 |
Assets (in millions) |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Unobservable Inputs (Level 3) |  |  | Net Asset Value ("NAV") |  |  | Total |
Cash |  | $ | 0.9 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 0.9 |
Insurance group annuity contracts |  |  | — |  |  |  | — |  |  |  | 14.5 |  |  |  | — |  |  |  | 14.5 |
Common/collective trust funds — Government, corporate and other non-government debt |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 93.7 |  |  |  | — |
Common/collective trust funds — Corporate equity |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 41.3 |  |  |  | — |
Total |  | $ | 0.9 |  |  | $ | — |  |  | $ | 14.5 |  |  | $ | 135.0 |  |  | $ | 150.4 |
Reconciliation of the Fair Values Measurements of Plan Assets Using Significant Unobservable Inputs (Level 3) from the Beginning of the Year to the End of the Year | A reconciliation of the fair values measurements of plan assets using significant unobservable inputs (Level 3) from the beginning of the year to the end of the year is as follows:
|  | Insurance Contracts Year Ended December 31, |
(in millions) |  | 2017 |  |  | 2016 |
Beginning Balance |  | $ | 14.5 |  |  | $ | 106.5 |
Distribution of MFS |  |  | — |  |  |  | (89.9 | )
Actual return on assets |  |  | — |  |  |  | 2.0 |
Benefit payments |  |  | (1.5 | ) |  |  | (1.4 | )
Foreign currency impact |  |  | 1.3 |  |  |  | (2.7 | )
Ending Balance |  | $ | 14.4 |  |  | $ | 14.5 |
Schedule of Projected Benefit Payments from the Plans | Projected benefit payments from the plans as of December 31, 2017 are estimated as follows:
(in millions) |  | U.S Pension Plans |  |  | Non-U.S. Pension Plans |  |  | Postretirement Health and Other |
2018 |  | $ | 9.8 |  |  | $ | 2.9 |  |  | $ | 3.5 |
2019 |  |  | 10.0 |  |  |  | 3.1 |  |  |  | 3.4 |
2020 |  |  | 10.2 |  |  |  | 3.4 |  |  |  | 3.2 |
2021 |  |  | 10.2 |  |  |  | 3.7 |  |  |  | 3.1 |
2022 |  |  | 10.1 |  |  |  | 3.8 |  |  |  | 2.6 |
2023 — 2027 |  |  | 49.7 |  |  |  | 21.3 |  |  |  | 10.1 |
Schedule of Fair Value of Plan Assets for which the Accumulated Benefit Obligation is in Excess of Plan Assets | The fair value of plan assets for which the accumulated benefit obligation is in excess of the plan assets as of December 31, 2017 and 2016 is as follows:
|  | U.S Pension Plans |  |  | Non U.S. Pension Plans |
(in millions) |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Projected benefit obligation |  | $ | 162.3 |  |  | $ | 155.6 |  |  | $ | 85.6 |  |  | $ | 79.1 |
Accumulated benefit obligation |  |  | 162.3 |  |  |  | 155.6 |  |  |  | 82.1 |  |  |  | 76.2 |
Fair value of plan assets |  |  | 116.2 |  |  |  | 108.6 |  |  |  | 41.6 |  |  |  | 38.4 |
U.S. Pension Plans |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of the Weighted-Average Asset Allocations of the Pension Plans | The weighted-average asset allocations of the U.S. pension plans at December 31, 2017 and 2016, by asset category are as follows:
|  | 2017 |  |  | 2016 |
Equity |  |  | 48.0 | % |  |  | 25.0 | %
Fixed income |  |  | 48.3 | % |  |  | 74.4 | %
Other |  |  | 3.7 | % |  |  | 0.6 | %
|  |  | 100.0 | % |  |  | 100.0 | %
Non-US Pension Plans |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of the Weighted-Average Asset Allocations of the Pension Plans | The weighted-average asset allocations of the Non-U.S. pension plans at December 31, 2017 and 2016, by asset category are as follows:
|  | 2017 |  |  | 2016 |
Equity |  |  | 35.6 | % |  |  | 33.7 | %
Fixed income |  |  | 31.6 | % |  |  | 31.1 | %
Other |  |  | 32.8 | % |  |  | 35.2 | %
|  |  | 100.0 | % |  |  | 100.0 | %

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