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Related Party Transactions
 3 Months Ended
Mar. 31, 2024
Related Party Transactions [Abstract]  
Related Party Transactions Related Party Transactions
The significant related party transactions occurring during the three months ended March 31, 2024 and 2023 are described below. We believe all of our transactions with related parties are at prices that approximate market.
Glencore Ownership
As of March 31, 2024, Glencore plc and its affiliates (together "Glencore") beneficially owned 42.9% of Century’s outstanding common stock (46.0% on a fully-diluted basis assuming the conversion of all of the Series A Convertible Preferred Stock) and all of our outstanding Series A Convertible Preferred Stock. See Note 8. Shareholders' Equity for a description of our outstanding Series A Convertible Preferred Stock. Century and Glencore enter into various transactions from time to time such as the purchase and sale of primary aluminum, purchase and sale of alumina and other raw materials, tolling agreements as well as forward financial contracts and borrowing and other debt transactions.
Sales to Glencore
For the three months ended March 31, 2024 and 2023, we derived approximately 64.3% and 75.0% of our consolidated net sales from Glencore, respectively.
Glencore purchases aluminum produced at our U.S. smelters at prices based on the LME plus the Midwest regional delivery premium plus any additional market-based product premiums. Glencore purchases aluminum produced at our Grundartangi, Iceland smelter at prices primarily based on the LME plus the European Duty Paid premium plus any additional market-based product premiums.
We have entered into agreements with Glencore pursuant to which we sell certain amounts of alumina at market-based prices. For the three months ended March 31, 2024 and 2023, the Company recognized $35.5 million and $21.0 million, respectively, of revenue related to alumina sales to Glencore.
Purchases from Glencore
We purchase a portion of our alumina and certain other raw material requirements from Glencore. Alumina purchases from Glencore during the three months ended March 31, 2024 and March 31, 2023, were priced based on published alumina and aluminum indices as well as fixed prices.
Financial Contracts with Glencore
We have certain financial contracts with Glencore. See Note 15. Derivatives regarding these forward financial sales contracts.
Summary
A summary of the aforementioned significant related party sales and purchases is as follows: 
 Three months ended
March 31,
 20242023
Net sales to Glencore$315.0 $412.2 
Purchases from Glencore(1)
59.0 76.1 
(1)Includes settlements of financial contract positions.
Vlissingen Facility Agreement
On December 9, 2022, Vlissingen entered into a Facility Agreement with Glencore International AG pursuant to which Vlissingen may borrow from time to time up to $90.0 million (the "Vlissingen Facility Agreement") in one or more loans at a fixed interest rate equal to 8.75% per annum and payable on December 2, 2024. See Note 11. Debt for additional information. Borrowings under the Vlissingen Facility Agreement are expected to be used for general corporate and working capital purposes of Century and its subsidiaries.
Carbon Credit Repurchase Agreement

In September 2023, our wholly owned subsidiary Nordural Grundartangi ehf ("Grundartangi"), entered into a structured repurchase arrangement ("Agreement") with an affiliate of Glencore and sold 390,000 European Union Allowances ("Carbon Credits") at a price of €82.18 per Carbon Credit, for an aggregate amount of €32.1 million. The terms of the transaction
permitted Grundartangi to repurchase the same number of Carbon Credits by December 21, 2023, at a price of €83.72 per Carbon Credit, for an aggregate amount of €32.7 million. In December 2023, the Agreement was amended ("Amended Agreement") to extend the repurchase window to March 25, 2024, and increased the repurchase price to €85.13 per Carbon Credit, for an aggregate amount of €33.2 million. In addition, Grundartangi entered into a second repurchase agreement ("Second Agreement") with Glencore to sell 40,000 Carbon Credits at a price of €69.30 per Carbon Credit and to repurchase the same number of Carbon Credits at a price of €70.71 per Carbon Credit for an aggregate amount of €2.8 million.

In March 2024, the Amended Agreement was amended to extend the repurchase window from March 25, 2024 to August 30, 2024 and the repurchase price was revised to €87.01 per Carbon Credit, for an aggregate amount of €33.9 million. In addition, the Second Agreement was amended to extend the repurchase window from March 25, 2024 to August 30, 2024 and revised the repurchase price to €72.59 per Carbon Credit, for an aggregate amount of €2.9 million. Due to the repurchase element of these transactions, the Company retains substantially all of the remaining benefits of the assets and has accounted for the transaction as a financing arrangement in accordance with Topic 606, Revenue from Contracts with Customers ("ASC 606").