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Multiemployer Pension Plans | 12 Months Ended
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Dec. 31, 2019
Multiemployer Plans [Abstract] |
Multiemployer Pension Plans | Multiemployer Pension Plans Overview. We contribute to multiemployer defined benefit pension plans under the terms of collective bargaining agreements that cover our union-represented employees at certain facilities. At December 31, 2019, approximately 51% of our total employees were union-represented employees at facilities participating in these multiemployer pension plans. We currently estimate that contributions will range from $3.0 million to $5.0 million per year through 2020. The risks of participating in these multiemployer plans are different from single-employer plans in the following aspects:
• | Assets contributed to the multiemployer plan by one employer may be used to provide benefits to employees of other participating employers.
• | If a participating employer stops contributing to the plan, the unfunded obligations of the plan may be borne by the remaining participating employers.
• | If we choose to stop participating in some of our multiemployer plans, we may be required to pay those plans an amount based on the underfunded status of the plan, referred to as a withdrawal liability.
Our participation in multiemployer pension plans for the year ended December 31, 2019 is outlined in the table below:
Pension Fund |  | Employer Identification Number |  | Pension Protection Act Zone Status 1 |  | FIP/RP Status Pending/Implemented in 2019 2 |  | Contributions of the Company |  | Surcharge Imposed in 2019 |  | Expiration Date of Collective-Bargaining Agreements
|  |  |  | 2019 |  | 2018 |  | 2017 |  |
|  |  |  | 2019 |  | 2018 |  |  |  | (in millions of dollars) |  |  |  |  |  |
Steelworkers Pension Trust (USW)3 |  | 23-6648508 |  | Green |  | Green |  | No |  | $ | 3.8 |  |  | $ | 3.6 |  |  | $ | 3.5 |  |  | No |  | Mar 2020 | - | Sep 2025
Other Funds 4 |  |  |  |  |  |  |  |  |  | 1.2 |  |  | 1.1 |  |  | 1.1 |  |  |  |  |  |  |
|  |  |  |  |  |  |  |  |  | $ | 5.0 |  |  | $ | 4.7 |  |  | $ | 4.6 |  |  |  |  |  |  |
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1. | The most recent Pension Protection Act zone status available in 2019 and 2018 for the Steelworkers Pension Trust is for the plan's year end at December 31, 2018 and December 31, 2017, respectively. The zone status is based on information that we received from the plan and is certified by the plan's actuary. Among other factors, plans in the green zone are at least 80% funded.
2. | The "FIP/RP Status Pending/Implemented" column indicates if a Financial Improvement Plan (FIP) or a Rehabilitation Plan (RP) is either pending or has been implemented for the plan under the Pension Protection Act.
3. | We are party to three collective bargaining agreements with the United Steel, Paper and Forestry, Rubber, Manufacturing, Energy, Allied Industrial and Service Workers International Union, AFL-CIO, CLC ("USW") that require contributions to the Steelworkers Pension Trust. As of December 31, 2019, USW collective bargaining agreements covering employees at our Newark, Ohio ("Newark") and Spokane, Washington ("Trentwood") facilities covered 87% of our USW-represented employees and expire in September 2025. Our monthly contributions per hour worked by each bargaining unit employee at our Newark and Trentwood facilities are (in whole dollars) $1.75 in 2019. The union contracts covering employees at our Richmond, Virginia facility and Florence, Alabama facility cover 10% and 3% of our USW-represented employees, respectively, and expire in November 2020 and March 2020, respectively.
4. | Other Funds consists of plans that are not individually significant.
We were not listed in any of the plans' Forms 5500 or the Canada-Wide Industrial Pension Plan financial statements as providing more than 5% of the total contributions for any of the plan years disclosed. At December 31, 2019, financial statements and Forms 5500 were not available for the plan years ending in 2019. Further, there were no significant changes to the number of employees covered by our multiemployer plans that would affect the period-to-period comparability of the contributions for the years presented.

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