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Employee Benefits | 3 Months Ended
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Mar. 31, 2024
Retirement Benefits [Abstract] |
Employee Benefits | 3. Employee Benefits Deferred Compensation Plan Assets of our deferred compensation plan are included in Other assets, classified within Level 1 of the fair value hierarchy and are measured and recorded at fair value based on their quoted market prices. The fair value of these assets at March 31, 2024 and December 31, 2023 was $11.3 million and $11.1 million, respectively. Assets in the trust are held in various investment funds at certain registered investment companies and are accounted for as equity investments with changes in fair value recorded within Other income, net (see Note 9). Offsetting liabilities relating to the deferred compensation plan are included in Other accrued liabilities and Long-term liabilities. Short-Term Incentive Plans (“STI Plans”) As of March 31, 2024, we had a liability of $6.1 million recorded within Accrued salaries, wages and related expenses for estimated probable future payments under the 2024 STI Plans. Postretirement Benefit Plans The following table presents the total expense related to all postretirement benefit plans (in millions of dollars):
|  | Quarter Ended March 31, |
|  | 2024 |  |  | 2023 |
Defined contribution plans 1 |  | $ | 5.8 |  |  | $ | 5.8 |
Deferred compensation plan 2 |  |  | 0.7 |  |  |  | 0.2 |
Multiemployer pension plans 1 |  |  | 1.5 |  |  |  | 1.4 |
Net periodic postretirement benefit cost relating to defined benefit plans 2,3 |  |  | 1.5 |  |  |  | 3.1 |
Total |  | $ | 9.5 |  |  | $ | 10.5 |
1. Substantially all of these charges related to employee benefits are in COGS with the remaining balance in Selling, general, administrative, research, and development (“SG&A and R&D”) within our Statements of Consolidated Income. 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 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, net, on our Statements of Consolidated Income. 3. 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 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, net, on our Statements of Consolidated Income. Components of Net Periodic Postretirement Benefit Cost. Our results of operations included the following impacts associated with the defined benefit plans: (i) a charge for service rendered by employees; (ii) a charge for accretion of interest; (iii) a benefit for the expected return on plan assets; (iv) amortization of prior service costs (credits) associated with plan amendments; and (v) amortization of net actuarial differences. The following table presents the components of Net periodic postretirement benefit cost (credit) relating to the defined benefit plans (in millions of dollars):
|  | Pension Plans |  |  | OPEB |  |  | Salaried VEBA |
|  | Quarter Ended |  |  | Quarter Ended |  |  | Quarter Ended |
|  | March 31 |  |  | March 31 |  |  | March 31 |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Service cost |  | $ | 0.9 |  |  | $ | 1.0 |  |  | $ | 0.3 |  |  | $ | 0.3 |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 0.4 |  |  |  | 0.3 |  |  |  | 0.8 |  |  |  | 0.8 |  |  |  | 0.5 |  |  |  | 0.7 |
Expected return on plan assets |  |  | (0.3 | ) |  |  | (0.3 | ) |  |  | — |  |  |  | — |  |  |  | (0.5 | ) |  |  | (0.6 | )
Amortization of prior service cost (credit)1 |  |  | 0.2 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (0.5 | ) |  |  | 1.2 |
Amortization of net actuarial gain |  |  | — |  |  |  | — |  |  |  | (0.3 | ) |  |  | (0.3 | ) |  |  | — |  |  |  | — |
Total net periodic postretirement benefit cost (credit) |  | $ | 1.2 |  |  | $ | 1.0 |  |  | $ | 0.8 |  |  | $ | 0.8 |  |  | $ | (0.5 | ) |  | $ | 1.3 |
1. We amortize prior service cost on a straight-line basis over the average remaining years of service of the active plan participants. Pension Plan Contributions. During the quarter ended March 31, 2024, we contributed $2.5 million to the pension plans. We expect to make further contributions of approximately $3.4 million to the pension plans during the remainder of 2024.

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