Company: CENX
Filing Date: 2025-03-03
Form Type: 10-K
Source: 0000949157-25-000024
Chunk: 144

Company: CENTURY ALUMINUM CO
Filing Date: 2025-03-03
Form: 10-K
Item: Item 8
Chunk 144
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4 $14.8 Prior service cost (benefit)1.6 1.8 — — Total$83.9 $83.9 $14.4 $14.8 Pension Plans That Are Not Fully FundedAt December 31, 2024, 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 $302.3 million, $279.3 million, and $245.1 million, respectively.At December 31, 2023, 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 $305.1 million, $305.9 million and $256.8 million, respectively.Components of net periodic benefit cost and other amounts recognized in other comprehensive income (loss):Net Periodic Benefit Cost: Year Ended December 31, PensionOPEB 202420232022202420232022Service cost$4.0 $3.3 $4.3 $0.2 $0.1 $0.2 Interest cost17.2 17.3 10.3 3.9 3.9 2.9 Expected return on plan assets(18.3)(17.3)(23.5)— — — Amortization of prior service costs0.2 0.1 0.1 — — (1.3)Amortization of net loss5.8 6.0 3.5 0.7 0.1 1.3 Net periodic benefit cost8.9 9.4 (5.3)4.8 4.1 3.1 Curtailment benefit (1)— — — — — (8.9)Total benefit cost$8.9 $9.4 $(5.3)$4.8 $4.1 $(5.8)(1)During 2022, we re-measured certain other postretirement benefits triggered by the Hawesville smelter curtailment, leading to a non-cash OPEB curtailment benefit totaling $8.9 million for the year ended December 31, 2022.

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CENTURY ALUMINUM COMPANYNOTES TO THE CONSOLID