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Employee Benefit Plans and Other Postretirement Benefits | 12 Months Ended
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Dec. 31, 2023
Retirement Benefits [Abstract] |
Employee Benefit Plans and Other Postretirement Benefits | 12. Employee Benefit Plans and Other Postretirement Benefits PCA has defined pension benefit plans for both salaried and hourly employees. The plans covering salaried employees are closed to new entrants with only certain current active participants still accruing benefits. The plans covering certain hourly employees are closed to new participants. We also have a Supplemental Executive Retirement Plan (SERP) and other nonqualified defined benefit pension plans that provide supplemental retirement benefits to certain of our current and former management employees. The SERP provides for incremental pension benefits in excess of those offered in our principal pension plans. Other Postretirement Benefits PCA provides postretirement medical and life insurance benefits for certain retired employees. Obligations and Funded Status of Defined Benefit Pension and Other Postretirement Benefits Plans The funded status of PCA's plans change from year to year based on the plan asset investment return, contributions, benefit payments, the discount rate used to measure the liability, and expected participant longevity. The following table, which includes only company-sponsored defined benefit and other postretirement benefit plans, reconciles the beginning and ending balances of the projected benefit obligation and the fair value of plan assets. We recognize the underfunded status of these plans on the Consolidated Balance Sheets, and we recognize changes in funded status in the year changes occur through the Consolidated Statements of Comprehensive Income (dollars in millions):
|  | Pension Plans |  |  | Postretirement Plans |
|  | Year Ended December 31 |  |  | Year Ended December 31 |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Change in Benefit Obligation: |  |  |  |  |  |  |  |  |  |  |  |
Benefit obligation at beginning of period |  | $ | 1,167.1 |  |  | $ | 1,503.8 |  |  | $ | 9.5 |  |  | $ | 13.6 |
Service cost |  |  | 14.1 |  |  |  | 19.3 |  |  |  | 0.2 |  |  |  | 0.2 |
Interest cost |  |  | 55.8 |  |  |  | 34.7 |  |  |  | 0.5 |  |  |  | 0.3 |
Plan amendments |  |  | 2.9 |  |  |  | 15.1 |  |  |  | — |  |  |  | — |
Actuarial loss (gain) (a) |  |  | 23.3 |  |  |  | (348.0 | ) |  |  | 1.5 |  |  |  | (3.4 | )
Participant contributions |  |  | — |  |  |  | — |  |  |  | 0.4 |  |  |  | 0.5 |
Benefits paid |  |  | (61.1 | ) |  |  | (57.8 | ) |  |  | (1.6 | ) |  |  | (1.7 | )
Benefit obligation at plan year end |  | $ | 1,202.1 |  |  | $ | 1,167.1 |  |  | $ | 10.5 |  |  | $ | 9.5 |
Accumulated benefit obligation portion of above |  | $ | 1,173.3 |  |  | $ | 1,131.0 |  |  |  |  |  |  |
Change in Fair Value of Plan Assets: |  |  |  |  |  |  |  |  |  |  |  |
Plan assets at fair value at beginning of period |  | $ | 1,055.3 |  |  | $ | 1,382.7 |  |  | $ | — |  |  | $ | — |
Actual return on plan assets |  |  | 115.9 |  |  |  | (320.9 | ) |  |  | — |  |  |  | — |
Company contributions |  |  | 51.5 |  |  |  | 51.3 |  |  |  | 1.2 |  |  |  | 1.2 |
Participant contributions |  |  | — |  |  |  | — |  |  |  | 0.4 |  |  |  | 0.5 |
Benefits paid |  |  | (61.1 | ) |  |  | (57.8 | ) |  |  | (1.6 | ) |  |  | (1.7 | )
Fair value of plan assets at plan year end |  | $ | 1,161.6 |  |  | $ | 1,055.3 |  |  | $ | — |  |  | $ | — |
Underfunded status |  | $ | (40.5 | ) |  | $ | (111.8 | ) |  | $ | (10.5 | ) |  | $ | (9.5 | )
Amounts Recognized on Consolidated Balance Sheets: |  |  |  |  |  |  |  |  |  |  |  |
Noncurrent assets |  | $ | 26.5 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Current liabilities |  |  | (1.7 | ) |  |  | (1.9 | ) |  |  | (0.5 | ) |  |  | (0.5 | )
Noncurrent liabilities |  |  | (65.3 | ) |  |  | (109.9 | ) |  |  | (10.0 | ) |  |  | (9.0 | )
Accrued obligation recognized at December 31 |  | $ | (40.5 | ) |  | $ | (111.8 | ) |  | $ | (10.5 | ) |  | $ | (9.5 | )
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax): |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost (credit) |  | $ | 29.2 |  |  | $ | 31.5 |  |  | $ | (3.8 | ) |  | $ | (4.2 | )
Actuarial loss (gain) |  |  | 116.0 |  |  |  | 155.6 |  |  |  | (4.7 | ) |  |  | (6.7 | )
Total |  | $ | 145.2 |  |  | $ | 187.1 |  |  | $ | (8.5 | ) |  | $ | (10.9 | )
(a) For the year ended December 31, 2023, the most significant driver of the increase in aggregate benefit obligations for the pension and OPEB plans was the actuarial losses due to a decrease in the discount rate assumption, PCA Hourly Pension Plan benefit multiplier increases, and changes in salary scale and medical claims assumptions to better reflect anticipated future experience. For the year ended December 31, 2022, the most significant driver of the decrease in aggregate benefit obligations for the pension and OPEB plans was the actuarial gains due to an increase in the discount rate assumption. Components of Net Periodic Benefit Cost and Other Comprehensive (Income) Loss The components of net periodic benefit cost and other comprehensive (income) loss (pretax) were as follows (dollars in millions):
|  | Pension Plans |  |  | Postretirement Plans |
|  | Year Ended December 31, |  |  | Year Ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | 2022 |  |  | 2021 |
Service cost |  | $ | 14.1 |  |  | $ | 19.3 |  |  | $ | 21.4 |  |  | $ | 0.2 |  |  | $ | 0.2 |  |  | $ | 0.2 |
Interest cost |  |  | 55.8 |  |  |  | 34.7 |  |  |  | 29.6 |  |  |  | 0.5 |  |  |  | 0.3 |  |  |  | 0.3 |
Expected return on plan assets |  |  | (57.1 | ) |  |  | (55.7 | ) |  |  | (63.1 | ) |  |  | — |  |  |  | — |  |  |  | — |
Net amortization of unrecognized amounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost (credit) |  |  | 5.2 |  |  |  | 3.6 |  |  |  | 3.8 |  |  |  | (0.4 | ) |  |  | (0.4 | ) |  |  | (0.4 | )
Actuarial loss (gain) |  |  | 4.1 |  |  |  | 3.4 |  |  |  | 10.4 |  |  |  | (0.4 | ) |  |  | (0.4 | ) |  |  | (0.5 | )
Net periodic benefit cost |  | $ | 22.1 |  |  | $ | 5.3 |  |  | $ | 2.1 |  |  | $ | (0.1 | ) |  | $ | (0.3 | ) |  | $ | (0.4 | )
Changes in plan assets and benefit obligations recognized in other comprehensive (income) loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actuarial net (gain) loss |  | $ | (35.5 | ) |  | $ | 28.6 |  |  | $ | (82.7 | ) |  | $ | 1.5 |  |  | $ | (3.4 | ) |  | $ | 1.3 |
Prior service cost (credit) |  |  | 2.9 |  |  |  | 15.1 |  |  |  | 2.1 |  |  |  | — |  |  |  | — |  |  |  | (0.1 | )
Amortization of prior service cost (credit) |  |  | (5.2 | ) |  |  | (3.6 | ) |  |  | (3.8 | ) |  |  | 0.4 |  |  |  | 0.4 |  |  |  | 0.4 |
Amortization of actuarial loss (gain) |  |  | (4.1 | ) |  |  | (3.4 | ) |  |  | (10.4 | ) |  |  | 0.4 |  |  |  | 0.4 |  |  |  | 0.5 |
Total recognized in other comprehensive loss (income) (b) |  | $ | (41.9 | ) |  | $ | 36.7 |  |  | $ | (94.8 | ) |  | $ | 2.3 |  |  | $ | (2.6 | ) |  | $ | 2.1 |
Total recognized in net periodic benefit cost and other comprehensive loss (income) (pre-tax) |  | $ | (19.8 | ) |  | $ | 42.0 |  |  | $ | (92.7 | ) |  | $ | 2.2 |  |  | $ | (2.9 | ) |  | $ | 1.7 |
(b) Accumulated losses in excess of 10% of the greater of the projected benefit obligation or the market-related value of assets will be recognized on a straight-line basis over the average remaining service period of active employees in PCA plans (which is between six and nine years) and over the average remaining lifetime of inactive participants in the Boise plan (which is approximately 23 years), to the extent that losses are not offset by gains in subsequent years. At December 31, 2022, the Company merged the four Boise qualified pension plans into one qualified pension plan. As a result of this plan merger, we did not have any plans in an overfunded position for the year ended December 31, 2022. For the years ended December 31, 2023 and 2022, the accumulated benefit obligations for the plans with obligations in excess of plan assets is $42.9 million and $1.1 billion, respectively, the pension benefit obligations for the plans with obligations in excess of plan assets is $334.3 million and $1.2 billion, respectively, and the fair value of the plan assets for the plans with obligations in excess of plan assets is $267.2 million and $1.1 billion, respectively. Additionally, for the years ended December 31, 2023 and 2022, the accumulated benefit obligations for the OPEB plans with obligations in excess of plan assets is $10.5 million and $9.5 million, respectively. Assumptions The following table presents the assumptions used in the measurement of our benefits obligations:
|  | Pension Plans |  | Postretirement Plans
|  | December 31, |  | December 31,
|  | 2023 |  | 2022 |  | 2021 |  | 2023 |  | 2022 |  | 2021
Weighted-Average Assumptions Used to Determine Benefit Obligations at December 31: |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  | 4.86 % |  | 5.06 % |  | 2.89 % |  | 4.90 % |  | 5.07 % |  | 2.91 %
Rate of compensation increase |  | 4.75 % |  | 4.00 % |  | 4.00 % |  | N/A |  | N/A |  | N/A
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for the Years Ended December 31: |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  | 5.06 % |  | 2.89 % |  | 2.57 % |  | 5.07 % |  | 2.92 % |  | 2.60 %
Expected return on plan assets |  | 5.52 % |  | 4.08 % |  | 4.91 % |  | N/A |  | N/A |  | N/A
Rate of compensation increase |  | 4.75 % |  | 4.00 % |  | 4.00 % |  | N/A |  | N/A |  | N/A
Discount Rate Assumption. The discount rate reflects the current rate at which the pension obligations could be settled on the measurement date: December 31. The discount rate assumption used to calculate the present value of pension and postretirement benefit obligations reflects the rates available on high-quality, fixed-income debt instruments at December 31. In all periods, the bonds included in the models reflect anticipated investments that would be made to match the expected monthly benefit payments over time. The plans' projected cash flows were duration-matched to these models to develop an appropriate discount rate. Asset Return Assumption. The expected return on plan assets reflects the expected long-term rates of return for the categories of investments currently held in the plans as well as anticipated returns for additional contributions made in the future. The expected long-term rate of return is adjusted when there are fundamental changes in expected returns on the plan investments. The weighted-average expected return on plan assets we will use in our calculation of 2024 net periodic pension benefit cost is 5.80%. Rate of Compensation Increase. The rate of compensation increase is determined by PCA based upon annual reviews. The compensation increase assumption is not applicable for all plans as many of our pension plans are frozen and not accruing benefits. Health Care Cost Trend Rate Assumptions. PCA assumed health care cost trend rates for its postretirement benefits plans were as follows:
|  | 2023 |  | 2022 |  | 2021
Health care cost trend rate assumed for next year |  | 7.13 % |  | 7.24 % |  | 6.55 %
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) |  | 4.44 % |  | 4.42 % |  | 4.50 %
Year that the rate reaches the ultimate trend rate |  | 2033 |  | 2033 |  | 2030
Postretirement Health Care Plan Assumptions. For postretirement health care plan accounting, PCA reviews external data and its own historical trends for health care costs to determine the health care cost trend rate assumption. Investment Policies and Strategies PCA has retained the services of professional advisors to oversee pension investments and provide recommendations regarding investment strategy. PCA’s overall strategy and related apportionments between equity and debt securities may change from time to time based on market conditions, external economic factors, and the funded status of the plans. The general investment objective for all of our plan assets is to optimize growth of the pension plan trust assets, while minimizing the risk of significant losses to enable the plans to satisfy their benefit payment obligations over time. The objectives take into account the long-term nature of the benefit obligations, the liquidity needs of the plans, and the expected risk/return trade-offs of the asset classes in which the plans may choose to invest. Assets of our pension plans were invested in the following classes of securities at December 31, 2023 and 2022:
|  | Percentage of Fair Value at December 31, |
|  | 2023 |  |  | 2022 |
Fixed income securities |  |  | 72 | % |  |  | 77 | %
International equity securities |  |  | 15 | % |  |  | 13 | %
Domestic equity securities |  |  | 11 | % |  |  | 9 | %
Other |  |  | 2 | % |  |  | 1 | %
At December 31, 2023, the targeted investment allocations differed between the plans based on funded status. For our pension plans, the weighted average target allocation of plan assets was 72% in fixed income, 27% in equities, and 1% in other. Our retirement committee reviews the investment allocations for reasonableness at a minimum, semi-annually. Investment securities, in general, are exposed to various risks, such as interest rate, credit, and overall market volatility risk, all of which are subject to change. Due to the level of risk associated with some investment securities, it is reasonably possible that changes in the values of investment securities will occur in the near term, and such changes could materially affect the reported amounts. Fair Value Measurements of Plan Assets The following tables set forth, by level within the fair value hierarchy, discussed in Note 2, Summary of Significant Accounting Policies, the pension plan assets, by major asset category, at fair value at December 31, 2023 and 2022 (dollars in millions):
|  | Fair Value Measurements at December 31, 2023 |
Asset Category |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |  |  | Net Asset Value (NAV) (a) |  |  | Total |
Short-term investments |  | $ | — |  |  | $ | 12.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 12.2 |
Common/collective trust funds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
International equities |  |  | 96.4 |  |  |  | 53.7 |  |  |  | — |  |  |  | 29.7 |  |  |  | 179.8 |
Domestic equities |  |  | — |  |  |  | 130.4 |  |  |  | — |  |  |  | — |  |  |  | 130.4 |
Corporate and government bonds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | — |  |  |  | 362.2 |  |  |  | — |  |  |  | — |  |  |  | 362.2 |
Government bonds and agencies |  |  | — |  |  |  | 297.5 |  |  |  | — |  |  |  | — |  |  |  | 297.5 |
Fixed income |  |  | — |  |  |  | 160.7 |  |  |  | — |  |  |  | — |  |  |  | 160.7 |
Municipal bonds |  |  | — |  |  |  | 12.7 |  |  |  | — |  |  |  | — |  |  |  | 12.7 |
Private equity securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.8 |  |  |  | 0.8 |
Total securities at fair value |  | $ | 96.4 |  |  | $ | 1,029.4 |  |  | $ | — |  |  | $ | 30.5 |  |  | $ | 1,156.3 |
Accrued income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.3 |
Total fair value of plan assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 1,161.6 |
|  | Fair Value Measurements at December 31, 2022 |
Asset Category |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |  |  | Net Asset Value (NAV) (a) |  |  | Total |
Short-term investments |  | $ | — |  |  | $ | 9.9 |  |  | $ | — |  |  | $ | — |  |  | $ | 9.9 |
Common/collective trust funds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
International equities |  |  | 73.3 |  |  |  | 42.4 |  |  |  | — |  |  |  | 16.9 |  |  |  | 132.6 |
Domestic equities |  |  | — |  |  |  | 98.2 |  |  |  | — |  |  |  | — |  |  |  | 98.2 |
Corporate and government bonds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | — |  |  |  | 338.5 |  |  |  | — |  |  |  | — |  |  |  | 338.5 |
Fixed income |  |  | — |  |  |  | 282.6 |  |  |  | — |  |  |  | — |  |  |  | 282.6 |
Government bonds and agencies |  |  | — |  |  |  | 167.1 |  |  |  | — |  |  |  | — |  |  |  | 167.1 |
Municipal bonds |  |  | — |  |  |  | 21.4 |  |  |  | — |  |  |  | — |  |  |  | 21.4 |
Private equity securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1.0 |  |  |  | 1.0 |
Total securities at fair value |  | $ | 73.3 |  |  | $ | 960.1 |  |  | $ | — |  |  | $ | 17.9 |  |  | $ | 1,051.3 |
Accrued income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.0 |
Total fair value of plan assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 1,055.3 |
(a) In accordance with ASC 820, Fair Value Measurement, certain investments that do not have readily determinable fair values are measured at fair value using the net asset value (NAV) per share practical expedient and are not classified within the fair value hierarchy. Funding and Cash Flows PCA makes pension plan contributions that are sufficient to fund its actuarially determined costs, generally equal to the minimum amounts required by the Employee Retirement Income Security Act (ERISA). From time to time, PCA may make discretionary contributions based on the funded status of the plans, tax deductibility, income from operations, and other factors. In each of 2023, 2022, and 2021, we made contributions of $50.0 million to our qualified pension plans. We do not have a required minimum contribution amount established for 2024, but we expect to make discretionary contributions to our plans. The following are estimated benefit payments to be paid to current plan participants by year (dollars in millions). Qualified pension benefit payments are paid from plan assets, while nonqualified pension benefit payments are paid by the Company.
|  | Pension Plans |  |  | Postretirement Plans |
2024 |  | $ | 66.3 |  |  | $ | 0.5 |
2025 |  |  | 70.0 |  |  |  | 0.6 |
2026 |  |  | 73.3 |  |  |  | 0.6 |
2027 |  |  | 76.0 |  |  |  | 0.6 |
2028 - 2033 |  |  | 492.7 |  |  |  | 3.8 |
Defined Contribution Plans Some of our employees participate in defined contribution savings plans, available to most of our salaried and hourly employees. The defined contribution plans permit participants to make contributions by salary reduction pursuant to Section 401(k) of the Code. PCA made employer-matching contributions of $45.2 million, $44.3 million, and $38.2 million in 2023, 2022, and 2021, respectively. All company-matching contributions to all employees were made in cash. We expense employer matching contributions and charge dividends on shares held by the ESOP to retained earnings. Shares of company stock held by the ESOP are included in basic shares for earnings-per-share computations. At December 31, 2023 and 2022, the ESOP held 1.1 million and 1.2 million shares of Company stock, respectively. Certain salaried and hourly employees that are not participating in a PCA sponsored defined benefit pension plan receive a service-related company retirement contribution to their defined contribution plan account in addition to any employer matching contribution. This contribution increases with years of service and ranges from 3% to 5% of base pay. We contributed $45.4 million, $43.7 million, and $46.4 million for this retirement contribution during the years ended December 31, 2023, 2022, and 2021, respectively. Deferred Compensation Plans Key managers can elect to participate in a deferred compensation plan. The deferred compensation plan is unfunded; therefore, benefits are paid from our general assets. At December 31, 2023 and 2022, we had $31.0 million and $22.8 million, respectively, of liabilities attributable to participation in our deferred compensation plan on our Consolidated Balance Sheets.

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