Company: CENX
Filing Date: 2025-03-03
Form Type: 10-K
Source: 0000949157-25-000024
Chunk: 143

Company: CENTURY ALUMINUM CO
Filing Date: 2025-03-03
Form: 10-K
Item: Item 8
Chunk 143
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(21.4)(19.9)(5.7)(6.8)Exchange rates(0.4)(0.5)— — Plan participants' contributions1.0 1.2 — — Benefit obligation at end of year$302.3 $305.1 $75.7 $76.8 The decreases in both the defined benefit plans' and OPEB plans' benefit obligation were mainly driven by lower interest costs and actuarial gains in 2024, which were primarily attributable to the changes in the discount rates from fiscal year 2023 to 2024.PensionOPEB2024202320242023Change in plan assets:    Fair value of plan assets at beginning of year$256.8 $216.6 $— $— Actual return on plan assets6.8 21.4 — — Acquisition— 31.5 — — Employer contributions2.3 6.6 5.5 6.5 Medicare Part D subsidy received— — 0.2 0.3 Benefits paid(21.5)(19.9)(5.7)(6.8)Exchange rates(0.3)(0.6)— — Plan participants' contributions1.0 1.2 — Fair value of assets at end of year$245.1 $256.8 $— $— 

82

CENTURY ALUMINUM COMPANYNOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS(amounts in millions, except share and per share amounts)

The change in actual return on plan assets in 2024 was primarily attributable to fluctuations in market prices during the year. PensionOPEB 2024202320242023Funded status of plans:    Funded status$(57.2)$(48.3)$(75.7)$(76.8)Amounts recognized in the Consolidated Balance Sheets:Current liabilities(1.8)(1.8)(6.5)(6.5)Non-current liabilities(55.4)(46.5)(69.2)(70.3)Net amount recognized$(57.2)$(48.3)$(75.7)$(76.8)Amounts recognized in accumulated other comprehensive loss (pre-tax):  Net loss$82.3 $82.1 $14.