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Pension and Other Postretirement Benefits | 12 Months Ended
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Dec. 31, 2020
Retirement Benefits [Abstract] |
Pension and Other Postretirement Benefits | Pension and Other Postretirement Benefits Pension Benefits We maintain noncontributory defined benefit pension plans for certain domestic hourly and salaried employees. For the eligible domestic salaried employees, plan benefits are based primarily on years of service and average compensation during the later years of employment. For hourly employees, plan benefits are based primarily on a formula that provides a specific benefit for each year of service. Our funding policy is to contribute amounts based upon actuarial and economic assumptions designed to achieve adequate funding of the projected benefit obligations and to meet the minimum funding requirements of the Employee Retirement Income Security Act of 1974 ("ERISA"). In addition, we maintain the supplemental executive retirement benefit ("SERB") plan for certain current and former executive officers, which is frozen to future accruals. PBGC Settlement In 2013, we entered into a settlement agreement with the Pension Benefit Guaranty Corporation ("PBGC") regarding an alleged "cessation of operations" at our Ravenswood facility. Pursuant to the terms of the agreement, we would make additional contributions (above any minimum required contributions) to our defined benefit pension plans totaling approximately $17.4 million over the term of the agreement. Under certain circumstances, in periods of lower primary aluminum prices relative to our cost of operations, we are able to defer one or more of these payments, but would then be required to provide the PBGC with acceptable security for deferred payments. We did not make any contributions during the years ended December 31, 2020, 2019 and 2018. We have elected to defer certain payments under the PBGC agreement and have provided the PBGC with the appropriate security. The remaining contributions under this agreement are approximately $9.6 million. Other Postretirement Benefits ("OPEB") In addition to providing pension benefits, we provide certain healthcare and life insurance benefits for certain domestic retired employees. We accrue the estimated cost of providing postretirement benefits during the working careers of those employees who could become eligible for such benefits when they retire. We fund these benefits as the retirees submit claims. Retiree medical welfare changes Under the current Hawesville labor agreement, employees who retire during the term of the labor agreement have been divided into sub-groups based on attributes such as Medicare eligibility, hire date, age and years of service. Levels of benefits are defined for the sub-groups and range from no substantive change from the benefits provided under the previous labor agreement to replacement of the defined retiree medical benefit program with individual health reimbursement accounts for each eligible participant. The health reimbursement accounts are funded based on established rates per hour worked by each eligible participant. Eligible participants will be able to withdraw from their health reimbursement accounts to fund their own retiree medical coverage. During 2017, the Company amended its non-union retiree medical and life insurance benefits to align the Company’s benefits with the market and achieve a uniform retiree medical benefit design across the Company’s U.S. locations. Effective January 1, 2018, non-union retiree medical and life insurance benefits are restricted to current participants who meet the eligibility criteria as of January 1, 2018. Additionally, effective January 1, 2019, Century will no longer administer non-union retiree medical, prescription drug, dental, or vision benefits and instead will make fixed health reimbursement account contributions. Obligations and Funded Status The change in benefit obligations and change in plan assets as of December 31 are as follows:
| Pension |  | OPEB
| 2020 |  | 2019 |  | 2020 |  | 2019
Change in benefit obligation: |  |  |  |  |  |  |
Benefit obligation at beginning of year | $ | 358.4 |  |  | $ | 314.4 |  |  | $ | 107.7 |  |  | $ | 108.7 |
Service cost | 4.9 |  |  | 4.0 |  |  | 0.2 |  |  | 0.2 |
Interest cost | 11.4 |  |  | 13.3 |  |  | 3.1 |  |  | 4.5 |
Actuarial (gain) loss | 31.1 |  |  | 46.5 |  |  | 2.7 |  |  | 0.1 |
Medicare Part D | — |  |  | — |  |  | 0.2 |  |  | 0.3 |
Benefits paid | (20.0) |  |  | (19.8) |  |  | (6.0) |  |  | (6.1) |
Benefit obligation at end of year | $ | 385.8 |  |  | $ | 358.4 |  |  | $ | 107.9 |  |  | $ | 107.7 |
The increase in the defined benefit plans' benefit obligation was mainly driven by the actuarial loss in 2020, which was primarily attributable to the decrease in the discount rate from fiscal year 2019 to 2020. This increase was partially offset by a new mortality projection scale assumption. The OPEB plan's benefit obligation remains consistent with prior year as the decrease in the discount rate from fiscal year 2019 to 2020 which led to an actuarial loss in 2020 was offset by the impact from a new longevity improvement scale assumption and general maturity of the OPEB plans.
| Pension |  | OPEB
| 2020 |  | 2019 |  | 2020 |  | 2019
Change in plan assets: |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | $ | 295.8 |  |  | $ | 261.7 |  |  | $ | — |  |  | $ | — |
Actual return on plan assets | 41.1 |  |  | 52.2 |  |  | — |  |  | — |
Employer contributions | 1.9 |  |  | 1.8 |  |  | 5.8 |  |  | 5.8 |
Medicare Part D subsidy received | — |  |  | — |  |  | 0.2 |  |  | 0.3 |
Benefits paid | (20.0) |  |  | (19.8) |  |  | (6.0) |  |  | (6.1) |
Fair value of assets at end of year | $ | 318.8 |  |  | $ | 295.9 |  |  | $ | — |  |  | $ | — |
The decrease of actual return on plan assets in 2020 was primarily attributable to the impact of COVID-19 on market prices during 2020.
| Pension |  | OPEB
| 2020 |  | 2019 |  | 2020 |  | 2019
Funded status of plans: |  |  |  |  |  |  |
Funded status | $ | (67.0) |  |  | $ | (62.6) |  |  | $ | (107.9) |  |  | $ | (107.7) |
Amounts recognized in the Consolidated Balance Sheets: |  |  |  |  |  |  |
Non-current assets | — |  |  | — |  |  | — |  |  | — |
Current liabilities | (1.8) |  |  | (1.8) |  |  | (6.4) |  |  | (7.1) |
Non-current liabilities | (65.2) |  |  | (60.8) |  |  | (101.5) |  |  | (100.7) |
Net amount recognized | $ | (67.0) |  |  | $ | (62.6) |  |  | $ | (107.9) |  |  | $ | (107.8) |
Amounts recognized in accumulated other comprehensive loss (pre-tax): |  |  |  |  |  |  |
Net loss | $ | 94.0 |  |  | $ | 89.7 |  |  | $ | 42.2 |  |  | $ | 41.7 |
Prior service cost (benefit) | 1.1 |  |  | 1.2 |  |  | (13.5) |  |  | (16.7) |
Total | $ | 95.1 |  |  | $ | 90.9 |  |  | $ | 28.7 |  |  | $ | 25.0 |
Pension Plans That Are Not Fully Funded At December 31, 2020, the projected benefit obligation, accumulated benefit obligation and fair value of plan assets for the pension plans with accumulated benefit obligations in excess of plan assets were $385.8 million, $379.4 million, and $318.8 million, respectively. At December 31, 2019, the projected benefit obligation, accumulated benefit obligation and fair value of plan assets for the pension plans with accumulated benefit obligations in excess of plan assets were $358.4 million, $352.2 million and $295.9 million, respectively. Components of net periodic benefit cost and other amounts recognized in other comprehensive loss: Net Periodic Benefit Cost:
| Year Ended December 31,
| Pension |  | OPEB
| 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018
Service cost | $ | 4.9 |  |  | $ | 4.0 |  |  | $ | 4.3 |  |  | $ | 0.2 |  |  | $ | 0.2 |  |  | $ | 0.2 |
Interest cost | 11.4 |  |  | 13.3 |  |  | 12.4 |  |  | 3.1 |  |  | 4.5 |  |  | 4.2 |
Expected return on plan assets | (20.8) |  |  | (18.3) |  |  | (21.1) |  |  | — |  |  | — |  |  | — |
Amortization of prior service costs | 0.1 |  |  | 0.1 |  |  | 0.1 |  |  | (3.2) |  |  | (4.9) |  |  | (7.3) |
Amortization of net loss | 6.5 |  |  | 6.6 |  |  | 5.2 |  |  | 2.2 |  |  | 2.3 |  |  | 4.0 |
Net periodic benefit cost | $ | 2.1 |  |  | $ | 5.7 |  |  | $ | 0.9 |  |  | $ | 2.3 |  |  | $ | 2.1 |  |  | $ | 1.2 |
Other changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Loss (pre-tax):
| Year Ended December 31,
| Pension |  | OPEB
| 2020 |  | 2019 |  | 2020 |  | 2019
Net loss (gain) | $ | 10.8 |  |  | $ | 12.6 |  |  | $ | 2.7 |  |  | $ | 0.1 |
Prior service cost (benefit) | — |  |  | — |  |  | — |  |  | — |
Amortization of net loss, including recognition due to settlement | (6.5) |  |  | (6.6) |  |  | (2.2) |  |  | (2.3) |
Amortization of prior service (cost) benefit, including recognition due to curtailment | (0.1) |  |  | (0.1) |  |  | 3.2 |  |  | 4.9 |
Total amount recognized in other comprehensive loss | 4.2 |  |  | 5.9 |  |  | 3.7 |  |  | 2.7 |
Net periodic benefit cost | 2.1 |  |  | 5.7 |  |  | 2.3 |  |  | 2.1 |
Total recognized in net periodic benefit cost and other comprehensive loss | $ | 6.3 |  |  | $ | 11.6 |  |  | $ | 6.0 |  |  | $ | 4.8 |
Weighted average assumptions used to determine benefit obligations at December 31:
| Pension |  | OPEB
| 2020 |  | 2019 |  | 2020 |  | 2019
Discount rate (1) | 2.58% |  | 3.26% |  | 2.34% |  | 3.07%
Rate of compensation increase (2) | 3%/3.5% |  | 3%/3.5% |  | 3%/3.5% |  | 3%/3.5%
Measurement date | 12/31/2020 |  | 12/31/2019 |  | 12/31/2020 |  | 12/31/2019
Weighted average assumptions used to determine net periodic benefit cost for the years ended December 31:
| Pension |  | OPEB
| 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018
Measurement date | 12/31/2019 |  | 12/31/2018 |  | 12/31/2017 |  | 12/31/2019 |  | 12/31/2018 |  | 12/31/2017
Fiscal year end | 12/31/2020 |  | 12/31/2019 |  | 12/31/2018 |  | 12/31/2020 |  | 12/31/2019 |  | 12/31/2018
Discount rate (1) | 3.22% |  | 4.38% |  | 3.69% |  | 2.79% |  | 4.29% |  | 3.66%
Rate of compensation increase (3) | 3%/3.5% |  | 3%/3.5% |  | 3%/4% |  | 3%/3.5% |  | 3%/3.5% |  | 3%/4%
Expected return on plan assets (4) | 7.25% |  | 7.25% |  | 7.18% |  | — |  | — |  | —
(1)We use the Ryan Above Median Yield Curve to determine the discount rate. (2)For 2020 and 2019, the rate of compensation increase is 3% per year for the first year and 3.5% per year thereafter. (3)For 2020, the rate of compensation increase is 3% per year for the first year and 3.5% per year thereafter. For 2019, the rate of compensation increase is 3% for the first year and 3.5% per year thereafter. For 2018, the rate of compensation increase is 3% per year for the first two years and 4% per year thereafter. (4)The rate for each of our defined benefit plans was selected by taking into account our expected asset mix and is based on historical performance as well as expected future rates of return on plan assets. For measurement purposes, medical cost inflation is initially estimated to be 6.1%, and 6.7% for pre and post-65 participants, respectively, declining to 4.5% over ten years and continuing thereafter. Benefit Plan Assets Pension Plan Investment Strategy and Policy The Pension Plans’ assets are invested in a prudent manner for the exclusive purpose of providing benefits to participants. Other objectives are to: •Provide a total return that, over the long term, provides sufficient assets to fund the pension plan liabilities subject to a level of risk, contributions and pension expense deemed appropriate by the company. •Minimize, where possible, pension expense volatility, and inclusion of liability driven investing as an investment strategy when appropriate. As the funding ratio improves, the objectives will evolve to minimize the funded status volatility. •Diversify investments within asset classes to reduce the impact of losses in single investments. The assets of the Pension Plans are invested in compliance with ERISA, as amended, and any subsequent applicable regulations and laws. Performance Our performance objective is to outperform the return of weighing passive investment alternatives by the policy target allocations after fees at a comparable level of risk. This investment objective is expected to be achieved over the long term and is measured over rolling multi-year periods. Peer-relative performance comparisons will also be considered especially when performance deviates meaningfully from market indexes. Investment objectives for each asset class are included below. Asset Allocation Policy Asset allocation policy is the principal method for achieving the Pension Plans' investment objectives stated above. The Pension Plans’ weighted average long-term strategic asset allocation policy targets are as follows:
| Pension Plan Asset Allocation
| 2020 Target |  | December 31, 2020 |  | December 31, 2019
Equities: |  |  |  |  |
U.S. equities | 30% |  | 31% |  | 27%
International equities | 26% |  | 27% |  | 23%
Fixed income | 44% |  | 42% |  | 50%
|  |  | 100% |  | 100%
U.S. and international equities are held for their long-term expected return premium over fixed income investments and inflation. Fixed income is held for diversification relative to equities. The strategic role of U.S. and international equities is to: •Provide higher expected returns of the major asset classes. •Maintain a diversified exposure within the U.S. and international stock markets through the use of multi-manager portfolio strategies. •Achieve returns in excess of passive indexes through the use of active investment managers and strategies. The strategic role of fixed income is to: •Diversify the Pension Plans’ equity exposure by investing in fixed income securities that exhibit a low correlation to equities, thereby lowering the overall return volatility of the entire investment portfolio. •Maintain a diversified exposure within the U.S. fixed income market through the use of multi-manager portfolio strategies. •Achieve returns in excess of passive indexes through the use of active investment managers and strategies. The long-term strategic asset allocation policy is reviewed regularly or whenever significant changes occur to Century’s or the Pension Plans' financial position and liabilities. Fair Value Measurements of Pension Plan assets The following table sets forth by level the fair value hierarchy our Pension Plans' assets. These assets are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Our assessment of the significance of a particular input to the fair value measurement requires judgment, and may affect the valuation of fair value assets and liabilities and the placement within the fair value hierarchy levels. Fair Value of Pension Plans’ assets included under the fair value hierarchy:
As of December 31, 2020 | Level 1 |  | Level 2 |  | Level 3 |  | Total
Equities: |  |  |  |  |  |  |
U.S. equities | $ | 98.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 98.4 |
International equities | 86.8 |  |  | — |  |  | — |  |  | 86.8 |
Fixed income | 133.6 |  |  | — |  |  | — |  |  | 133.6 |
Total | $ | 318.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 318.8 |
As of December 31, 2019 |  |  |  |  |  |  |
Equities: |  |  |  |  |  |  |
U.S. equities | $ | 78.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 78.5 |
International equities | 66.7 |  |  | — |  |  | — |  |  | 66.7 |
Fixed income | 150.7 |  |  | — |  |  | — |  |  | 150.7 |
Total | $ | 295.9 |  |  | $ | — |  |  | $ | — |  |  | $ | 295.9 |
Our Pension Plans’ assets are held in certain mutual funds. The fair value of the mutual funds is based on the Net Asset Value ("NAV") which is calculated every business day. The value of the underlying securities within the mutual funds are determined as follows: •U.S. listed equities; equity and fixed income options: Last sale price; last bid price if no last sale price; •U.S. over-the-counter equities: Official closing price; last bid price if no closing price; •Foreign equities: Official closing price, where available, or last sale price; last bid price if no official closing price; and •Municipal bonds, US bonds, Eurobonds/foreign bonds: Evaluated bid price; broker quote if no evaluated bid price. Our other postretirement benefit plans are unfunded. We fund these benefits as the retirees submit claims. Pension and OPEB Cash Flows During both 2020 and 2019, we made contributions of approximately $1.9 million and $1.8 million to the qualified defined benefit and SERB plans we sponsor, respectively. We expect to make the following contributions for 2021:
| 2021
Expected pension plan contributions | $ | 1.8 |
Expected OPEB benefits payments | 6.4 |
Estimated Future Benefit Payments The following table provides the estimated future benefit payments for the pension and other postretirement benefit plans:
| Pension Benefits |  | OPEB Benefits
2021 | $ | 20.8 |  |  | $ | 6.4 |
2022 | 20.9 |  |  | 6.4 |
2023 | 20.6 |  |  | 6.3 |
2024 | 20.3 |  |  | 6.3 |
2025 | 20.2 |  |  | 6.2 |
2026 – 2030 | 99.7 |  |  | 30.1 |
Participation in Multi-employer Pension Plans The union-represented employees at Hawesville are part of a United Steel, Paper and Forestry, Rubber, Manufacturing, Energy, Allied Industrial and Service Workers International Union ("USWA") sponsored multi-employer plan. Our contributions to the plan are determined at a fixed rate per hour worked. Currently, we do not have any plans to withdraw from or curtail participation in this plan. The risks of participating in a multi-employer plan are different from single-employer plans in the following respects: •Assets contributed to the multi-employer 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 a participating employer chooses to stop participating in a multi-employer plan, the employer may be required to pay the plan an amount based on the underfunded status of the plan, referred to as a withdrawal liability. Century’s participation in the plan for the year ended December 31, 2020, is outlined in the table below.
Fund |  | Steelworkers Pension Trust
EIN / PN |  | 23-6648508/499
Pension Protection Act Zone Status 2020 (1) |  | Green
Pension Protection Act Zone Status 2019 (1) |  | Green
Subject to Financial Improvement/Rehabilitation Plan (2) |  | No
Contributions of Century Aluminum 2020 |  | $1.4
Contributions of Century Aluminum 2019 |  | $1.3
Contributions of Century Aluminum 2018 |  | $1.0
Withdrawal from Plan Probable |  | No
Surcharge Imposed |  | No
Expiration Date of Collective Bargaining Agreement (2) |  | March 31, 2021
(1)The most recent Pension Protection Act zone status available in 2020 and 2019 is for the plan's year-end December 31, 2019 and December 31, 2018, respectively. The zone status is based on information that Century received from the plan as well as publicly available information per the Department of Labor and is certified by the plan’s actuary. Among other factors, plans in the green zone are at least 80 percent funded. (2)The “Subject to Financial Improvement / Rehabilitation Plan” column indicates plans for which a financial improvement plan (FIP) or a rehabilitation plan (RP) is either pending or has been implemented. The last column lists the expiration date(s) of the collective-bargaining agreement(s) to which the plans are subject. Century 401(k) Plans We sponsor a tax-deferred savings plan under which eligible domestic employees may elect to contribute specified percentages of their compensation with Century. We match a portion of participants' contributions to the savings plan. Employee and matching contributions are considered fully vested immediately upon participation in the plan. Concurrent with the 2014 amendment to the Salaried Pension Plan that eliminated future accruals for participants who are under age 50 as of January 1, 2015 and closed the plan to new entrants, the Company increased the proportional match of contributions made to those affected by the amendment. The expense related to the plan was $4.9 million, $4.9 million, and $4.4 million for 2020, 2019, and 2018, respectively.

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