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Subsequent Events
 9 Months Ended
Sep. 30, 2021
Subsequent Events [Abstract]  
Subsequent events Subsequent Events
PBGC Settlement Amendment

On October 1, 2021, we amended the PBGC Settlement Agreement such that we removed the deferral mechanism and agreed to contribute approximately $2.4 million per year to our defined benefit pension plans for a total of approximately $9.6 million, over the next four years beginning on November 30, 2022 and ending on November 30, 2025, subject to acceleration if certain terms and conditions are met in such amendment. See Note 10. Commitments and Contingencies.
Helguvik Bankruptcy Filing
On October 20, 2021, Nordural Helguvik ehf ("Helguvik"), a wholly owned subsidiary and owner of the former Helguvik project site which has been curtailed since 2008, filed for bankruptcy and on October 28, 2021, a district court in Iceland issued a verdict declaring bankruptcy of Helguvik. We believe the bankruptcy filing will not have a material impact on the consolidated financial statements.
Grundartangi Casthouse
On November 3, 2021, Century announced plans for construction of a new billet casthouse at Grundartangi (the “Grundartangi casthouse project”). The new value-added casthouse will have a capacity of 150,000 tonnes of billet production and is expected to start production in the first quarter of 2024. The expansion project will also increase Grundartangi’s annual capacity to produce primary foundry alloys from its current 60,000 tonnes of capacity to 120,000 tonnes of capacity. This incremental billet and primary foundry alloy capacity displaces standard-grade ingot production, raising expected product premiums for Grundartangi products. The billet produced at the Grundartangi casthouse is expected to be low-carbon aluminum or Natur-AlTM. The Grundartangi casthouse project will be fully funded with 100% green financing through the Casthouse Facility (as defined below).

On November 2, 2021, Grundartangi entered into an eight-year Term Facility Agreement with Arion Bank hf, to provide for borrowings up to $130 million in connection with the casthouse project at Grundartangi (the “Casthouse Facility”). Under the Casthouse Facility, repayments of principal amounts will be made in equal quarterly installments, the first payment occurring 30 months after the first drawdown by Grundartangi. The interest rate shall be the sum of the interest rate equal to USD LIBOR 3 month as published at any given time by the Intercontinental Exchange (and if the rate is less than zero, this amount shall be deemed to be zero) plus the applicable margin as set forth in the agreement. Grundartangi shall pay an arrangement fee equal to 0.78% of the total facility amount regardless of whether there are amounts outstanding under the Casthouse Facility and shall pay a commitment fee of 0.38% per annum on undrawn commitments, payable quarterly at the same time as interest payments are due and payable. This Casthouse Facility contains customary covenants, including restrictions on mergers and acquisitions, indebtedness, preservation of assets, and dispositions of assets and contains a covenant that requires Grundartangi to maintain a minimum equity ratio. At the time of filing this quarterly report, there are no outstanding borrowings under this Casthouse Facility.