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Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2022
Retirement Benefits [Abstract] |
Schedule of Assumptions Used for Benefit Obligation | Key Assumptions. The following table presents the weighted average assumptions used to determine benefit obligations:
|  | Pension Plans 1 |  |  | OPEB |  |  | Salaried VEBA |
|  | As of December 31, |  |  | As of December 31, |  |  | As of December 31, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Discount rate |  |  | 5.16 | % |  |  | 2.90 | % |  |  | 5.14 | % |  |  | 2.64 | % |  |  | 5.10 | % |  |  | 2.49 | %
Rate of compensation increase |  |  | 2.69 | % |  |  | 2.74 | % |  |  | — | % |  |  | — | % |  |  | — | % |  |  | — | %
1. Assumptions for our pension plans are weighted based on the total benefit obligations of each.
Schedule of Assumptions Used to Determine Net Periodic Benefit Cost (Income) | The following table presents the weighted average assumptions used to determine net periodic postretirement benefit cost:
|  | Pension Plans 1 |  |  | OPEB |  | Salaried VEBA |
|  | Year Ended December 31, |  |  | Year Ended December 31, |  | Year Ended December 31, |
|  | 2022 |  |  | 2021 |  |  | 2020 |  |  | 2022 |  |  | 2021 |  |  | 2020 |  | 2022 |  |  | 2021 |  |  | 2020 |
Discount rate |  |  | 2.90 | % |  |  | 2.89 | % |  |  | 3.10 | % |  |  | 2.64 | % |  |  | 2.97 | % |  | n/a |  |  | 2.49 | % |  |  | 2.05 | % |  |  | 2.95 | %
Expected long-term return on plan assets 2 |  |  | 6.02 | % |  |  | 5.78 | % |  |  | 4.45 | % |  |  | — | % |  |  | — | % |  | n/a |  |  | 5.50 | % |  |  | 5.50 | % |  |  | 5.50 | %
Rate of compensation increase |  |  | 2.69 | % |  |  | 2.74 | % |  |  | 3.00 | % |  |  | — | % |  |  | — | % |  | n/a |  |  | — | % |  |  | — | % |  |  | — | %
1. Assumptions for our pension plans are weighted based on the total benefit obligations of each. 2. The expected long-term rate of return assumption for the Salaried VEBA is based on the targeted investment portfolios provided to us by the trustee of the Salaried VEBA.
Schedule of Changes in Benefit Obligations | The following table presents the benefit obligations and funded status of our pension plans, OPEB and the Salaried VEBA and the corresponding amounts that are included in our Consolidated Balance Sheets (in millions of dollars):
|  | Pension Plans |  |  | OPEB |  |  | Salaried VEBA |
|  | As of December 31, |  |  | As of December 31, |  |  | As of December 31, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Change in benefit obligation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligation at beginning of year |  | $ | 20.3 |  |  | $ | 10.0 |  |  | $ | 83.5 |  |  | $ | — |  |  | $ | 79.8 |  |  | $ | 78.3 |
Obligation assumed through acquisition of Warrick |  |  | — |  |  |  | 6.5 |  |  |  | — |  |  |  | 78.1 |  |  |  | — |  |  |  | — |
Foreign currency translation adjustment |  |  | (0.5 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Service cost |  |  | 5.8 |  |  |  | 4.1 |  |  |  | 1.6 |  |  |  | 1.1 |  |  |  | 0.1 |  |  |  | 0.1 |
Interest cost |  |  | 0.6 |  |  |  | 0.5 |  |  |  | 2.2 |  |  |  | 1.7 |  |  |  | 1.9 |  |  |  | 1.5 |
Prior service cost 1 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 14.0 |
Actuarial (gain) loss 2 |  |  | (7.1 | ) |  |  | (0.3 | ) |  |  | (20.4 | ) |  |  | 2.6 |  |  |  | (16.3 | ) |  |  | (6.9 | )
Plan participants contributions |  |  | 0.1 |  |  |  | — |  |  |  | 0.1 |  |  |  | — |  |  |  | — |  |  |  | — |
Benefits paid |  |  | (0.4 | ) |  |  | (0.5 | ) |  |  | (0.6 | ) |  |  | — |  |  |  | (6.6 | ) |  |  | (7.2 | )
Obligation at end of year 3 |  |  | 18.8 |  |  |  | 20.3 |  |  |  | 66.4 |  |  |  | 83.5 |  |  |  | 58.9 |  |  |  | 79.8 |
Change in plan assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair market value of plan assets at beginning of year |  |  | 9.8 |  |  |  | 8.7 |  |  |  | — |  |  |  | — |  |  |  | 59.2 |  |  |  | 60.5 |
Foreign currency translation adjustment |  |  | (0.5 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Actual return on assets |  |  | (2.6 | ) |  |  | 1.1 |  |  |  | — |  |  |  | — |  |  |  | (10.2 | ) |  |  | 5.9 |
Plan participants contributions |  |  | 0.1 |  |  |  | — |  |  |  | 0.1 |  |  |  | — |  |  |  | — |  |  |  | — |
Company contributions |  |  | 8.5 |  |  |  | 0.5 |  |  |  | 0.5 |  |  |  | — |  |  |  | — |  |  |  | — |
Benefits paid |  |  | (0.4 | ) |  |  | (0.5 | ) |  |  | (0.6 | ) |  |  | — |  |  |  | (6.6 | ) |  |  | (7.2 | )
Fair market value of plan assets at end of year |  |  | 14.9 |  |  |  | 9.8 |  |  |  | — |  |  |  | — |  |  |  | 42.4 |  |  |  | 59.2 |
Net funded status 4 |  | $ | (3.9 | ) |  | $ | (10.5 | ) |  | $ | (66.4 | ) |  | $ | (83.5 | ) |  | $ | (16.5 | ) |  | $ | (20.6 | )
Cumulative gain (loss) recognized in Accumulated other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated net actuarial gain (loss) |  | $ | 2.6 |  |  | $ | (1.0 | ) |  | $ | 17.8 |  |  | $ | (2.6 | ) |  | $ | 1.7 |  |  | $ | (1.2 | )
Prior service cost |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (29.7 | ) |  |  | (34.6 | )
Total |  | $ | 2.6 |  |  | $ | (1.0 | ) |  | $ | 17.8 |  |  | $ | (2.6 | ) |  | $ | (28.0 | ) |  | $ | (35.8 | )
1. The prior service cost relating to the Salaried VEBA in 2021 resulted from increases in the annual healthcare reimbursement benefit in 2021 for plan participants. 2. The actuarial gain relating to our pension plans in 2022 was comprised of an $8.0 million gain due to a change in the discount rate and a $0.9 million loss due to changes in census information. The actuarial gain relating to our pension plans in 2021 was comprised of a $0.3 million gain due to changes in census information. The actuarial gain relating to the OPEB in 2022 was comprised of a $20.4 million gain due to a change in the discount rate, a $0.7 million gain due to changes in census information and a $0.7 million loss due t o a change in the trend rate assumption. The actuarial loss relating to the OPEB in 2021 was comprised of a $3.2 million loss due to a change in the discount rate and a $0.6 million gain due to changes in census information. The actuarial gain relating to the Salaried VEBA in 2022 was comprised of a $12.6 million gain due to a change in the discount rate, a $2.6 million gain due to changes in census information and a $1.1 million gain due t o a change in the trend rate assumption. The actuarial gain relating to the Salaried VEBA in 2021 was comprised of a $3.9 million gain due to changes in census information and a $3.0 million gain due to a change in the discount rate. 3. For the pension plans, the benefit obligation is the projected benefit obligation. For the Salaried VEBA and OPEB, the benefit obligation is the APBO. 4. Net funded status relating to the pension plans consisted of $1.0 million and $4.9 million within Other assets and Long-term liabilities, respectively, at December 31, 2022 and $10.5 million within Long-term liabilities at December 31, 2021 on our Consolidated Balance Sheets. Of the Net funded status relating to the OPEB at December 31, 2022, $2.0 million was included within Accrued salaries, wages and related expenses and $64.4 million was included within Long-term liabilities on our Consolidated Balance Sheets. Of the Net funded status relating to the OPEB at December 31, 2021, $1.6 million was included within Pension and other postretirement benefits and $81.9 million was included within Long-term liabilities on our Consolidated Balance Sheets. Net funded status relating to the Salaried VEBA at December 31, 2022 and December 31, 2021 was included within Long-term liabilities on our Consolidated Balance Sheets.
Schedule of Expected Benefit Payments | The following table presents the net benefits expected to be paid (in millions of dollars):
|  | Year Ended December 31, |
|  | 2023 |  |  | 2024 |  |  | 2025 |  |  | 2026 |  |  | 2027 |  |  | 2028-2032 |
Pension benefit payments |  | $ | 0.5 |  |  | $ | 0.7 |  |  | $ | 0.8 |  |  | $ | 1.1 |  |  | $ | 1.2 |  |  | $ | 8.3 |
Salaried VEBA benefit payments 1 |  |  | 6.7 |  |  |  | 6.4 |  |  |  | 6.1 |  |  |  | 5.8 |  |  |  | 5.5 |  |  |  | 23.2 |
OPEB payments |  |  | 2.0 |  |  |  | 2.8 |  |  |  | 3.4 |  |  |  | 4.1 |  |  |  | 4.7 |  |  |  | 31.7 |
Total |  | $ | 9.2 |  |  | $ | 9.9 |  |  | $ | 10.3 |  |  | $ | 11.0 |  |  | $ | 11.4 |  |  | $ | 63.2 |
1. Such amounts are based on benefit amounts and certain key assumptions obtained from the Salaried VEBA trustees and will be paid out of the Salaried VEBA plan assets.
Summary of Asset Class Allocation per Pension Plan Investment Policy and Weighted Average Asset Allocation | Plan Assets. The following table presents the asset class allocation per our pension plan investment policy and the weighted average asset allocation:
Asset class |  | Policy range |  | As of December 31, 2022
Equities |  | 54% - 60% |  | 59%
Fixed income |  | 35% - 40% |  | 34%
Other investments |  | 5% - 6% |  | 7%
Schedule of Fair Value of Plan Assets | The following table presents the fair value of plan assets, classified under the appropriate level of the fair value hierarchy (in millions of dollars):
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
As of December 31, 2022: |  |  |  |  |  |  |  |  |  |  |  |
Plan Assets in the Fair Value Hierarchy: |  |  |  |  |  |  |  |  |  |  |  |
Salaried VEBA – Equity investment funds in registered investment companies 1 |  | $ | 27.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 27.4 |
Salaried VEBA – Fixed income investment funds in registered investment companies 2 |  |  | 15.0 |  |  |  | — |  |  |  | — |  |  |  | 15.0 |
Pension plans – Equity investment funds in registered investment companies 1 |  |  | 4.1 |  |  |  | — |  |  |  | — |  |  |  | 4.1 |
Pension plans – Fixed income investment funds in registered investment companies 2 |  |  | 2.6 |  |  |  | — |  |  |  | — |  |  |  | 2.6 |
Pension plans – Diversified investment funds in registered investment companies 3 |  |  | 8.2 |  |  |  | — |  |  |  | — |  |  |  | 8.2 |
Deferred compensation program – Diversified investment funds in registered investment companies 3 |  |  | 9.8 |  |  |  | — |  |  |  | — |  |  |  | 9.8 |
Total plan assets in the fair value hierarchy |  | $ | 67.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 67.1 |
As of December 31, 2021: |  |  |  |  |  |  |  |  |  |  |  |
Plan Assets in the Fair Value Hierarchy: |  |  |  |  |  |  |  |  |  |  |  |
Salaried VEBA – Equity investment funds in registered investment companies 1 |  | $ | 38.6 |  |  | $ | — |  |  | $ | — |  |  | $ | 38.6 |
Salaried VEBA – Fixed income investment funds in registered investment companies 2 |  |  | 20.6 |  |  |  | — |  |  |  | — |  |  |  | 20.6 |
Deferred compensation program – Diversified investment funds in registered investment companies 3 |  |  | 10.5 |  |  |  | — |  |  |  | — |  |  |  | 10.5 |
Total plan assets in the fair value hierarchy |  | $ | 69.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 69.7 |
Plan Assets Measured at NAV 4: |  |  |  |  |  |  |  |  |  |  |  |
Pension plans – Equity investment funds in registered investment companies 1 |  |  |  |  |  |  |  |  |  |  | $ | 0.1 |
Pension plans – Fixed income investment funds in registered investment companies 2 |  |  |  |  |  |  |  |  |  |  |  | 0.1 |
Pension plans – Diversified investment funds in registered investment companies 3 |  |  |  |  |  |  |  |  |  |  |  | 9.6 |
Total plan assets at fair value |  |  |  |  |  |  |  |  |  |  | $ | 79.5 |
1. Equity investment funds in registered investment companies. This category represents investments in equity funds that invest in portfolios comprised primarily of equity and equity-related securities of U.S. and non-U.S. issuers across all market capitalizations. 2. Fixed income investment funds in registered investment companies. This category represents investments in various fixed income funds with multiple registered investment companies. Such funds invest primarily in bonds, debentures, notes, securities with equity and fixed-income characteristics, cash equivalents, securities backed by mortgages and other assets, loans, pooled or collective investment vehicles made up of fixed‑income securities and other fixed-income obligations of banks, corporations and governmental authorities. 3. Diversified investment funds in registered investment companies. The plan assets are invested in investment funds that hold a diversified portfolio of: (i) U.S. and international debt and equity securities; (ii) fixed income securities such as corporate bonds and government bonds; (iii) mortgage-related securities; and (iv) cash and cash equivalents. 4. NAV. The market value of these funds has not been categorized in the fair value hierarchy and is being presented in the table above to permit a reconciliation of the fair value hierarchy to our Consolidated Balance Sheets and are comprised primarily of unitized mutual funds without externally published net asset values, which can be redeemed daily without restriction.
Schedule of Total Expense Related to Benefit Plans | The following table presents the total expense related to all benefit plans (in millions of dollars):
|  | Year Ended December 31, |
|  | 2022 |  |  | 2021 |  |  | 2020 |
Defined contribution plans 1 |  | $ | 17.1 |  |  | $ | 13.9 |  |  | $ | 8.3 |
Deferred compensation plan 2 |  |  | (0.6 | ) |  |  | 0.7 |  |  |  | 1.5 |
Multiemployer pension plans 1,3 |  |  | 5.2 |  |  |  | 5.0 |  |  |  | 4.9 |
Net periodic postretirement benefit cost relating to defined benefit plans 2,3,4 |  |  | 13.1 |  |  |  | 9.4 |  |  |  | 5.2 |
Total |  | $ | 34.8 |  |  | $ | 29.0 |  |  | $ | 19.9 |
1. Substantially all of these charges related to employee benefits are in COGS with the remaining balance in SG&A and R&D. 2. Deferred compensation plan expense and the current service cost component of Net periodic postretirement benefit cost relating to Salaried VEBA are included within our Statements of Consolidated (Loss) Income in SG&A and R&D for all periods presented. All other components of Net periodic postretirement benefit cost relating to Salaried VEBA are included within Other income (expense), net, in our Statements of Consolidated (Loss) Income. 3. See Note 6 for more information on our multiemployer defined benefit pension plans. 4. The current service cost component of Net periodic postretirement benefit cost relating to both the pension plans and the OPEB plan are included within our Statements of Consolidated (Loss) Income in COGS for all periods presented. All other components of Net periodic postretirement benefit cost relating to both the pension plans and the OPEB plan are included within Other income (expense), net, in our Statements of Consolidat ed (Loss) Income.
Schedule of Net Benefit Costs | The following table presents the components of Net periodic postretirement benefit cost relating to our pension plans, OPEB plan and the Salaried VEBA (in millions of dollars):
|  | Pension Plans 1 |  |  | OPEB 1 |  | Salaried VEBA |
|  | Year Ended December 31, |  |  | Year Ended December 31, |  | Year Ended December 31, |
|  | 2022 |  |  | 2021 |  |  | 2020 |  |  | 2022 |  |  | 2021 |  |  | 2020 |  | 2022 |  |  | 2021 |  |  | 2020 |
Service cost |  | $ | 5.8 |  |  | $ | 4.1 |  |  | $ | 0.3 |  |  | $ | 1.6 |  |  | $ | 1.1 |  |  | n/a |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.1 |
Interest cost |  |  | 0.6 |  |  |  | 0.5 |  |  |  | 0.3 |  |  |  | 2.2 |  |  |  | 1.7 |  |  | n/a |  |  | 1.9 |  |  |  | 1.5 |  |  |  | 2.5 |
Expected return on plan assets |  |  | (0.9 | ) |  |  | (0.4 | ) |  |  | (0.3 | ) |  |  | — |  |  |  | — |  |  | n/a |  |  | (3.1 | ) |  |  | (3.1 | ) |  |  | (2.8 | )
Amortization of prior service cost 2 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  | n/a |  |  | 4.9 |  |  |  | 3.5 |  |  |  | 4.7 |
Amortization of net actuarial loss |  |  | — |  |  |  | 0.1 |  |  |  | 0.1 |  |  |  | — |  |  |  | — |  |  | n/a |  |  | — |  |  |  | 0.3 |  |  |  | 0.3 |
Net periodic postretirement benefit cost |  | $ | 5.5 |  |  | $ | 4.3 |  |  | $ | 0.4 |  |  | $ | 3.8 |  |  | $ | 2.8 |  |  | n/a |  | $ | 3.8 |  |  | $ | 2.3 |  |  | $ | 4.8 |
1. Net periodic postretirement benefit cost for 2020 included only the Canadian pension plan. Net periodic postretirement benefit cost for the U.S. pension plan and the OPEB was not included in our Statements of Consolidated (Loss) Income until the March 31, 2021 acquisition date of our Warrick facility. 2. We amortize prior service cost on a straight-line basis over the average remaining years of service to full eligibility for benefits of the active plan participants.

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