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Debt
 6 Months Ended
Jun. 30, 2025
Debt Disclosure [Abstract]  
Debt
11.    Debt
June 30, 2025December 31, 2024
Debt classified as current liabilities:
Hancock County industrial revenue bonds ("IRBs") due April 1, 2028, interest payable quarterly (variable interest rates (not to exceed 12%))(1)
$7.8 $7.8 
U.S. Revolving Credit Facility(2)
19.6 20.0 
Iceland Revolving Credit Facility(3)
— 34.0 
Grundartangi Casthouse Facility(4)
9.0 9.0 
Debt classified as non-current liabilities:
Grundartangi Casthouse Facility, net of financing fees of $1.0 million at June 30, 2025(4)
108.7 114.2 
Vlissingen Credit Facility(5)
10.0 10.0 
7.5% senior secured notes due April 1, 2028, net of financing fees of $1.6 million at June 30, 2025, interest payable semiannually
248.4 248.1 
2.75% convertible senior notes due May 1, 2028, net of financing fees of $1.0 million at June 30, 2025, interest payable semiannually
85.3 85.1 
Total$488.8 $528.2 
(1)The IRBs are classified as current liabilities because they are remarketed weekly and could be required to be repaid upon demand if there is a failed remarketing. The interest rate at June 30, 2025 was 2.05%.
(2)We incur interest at a base rate plus applicable margin as defined within the agreement. The interest rate at June 30, 2025 was 8.00%.
(3)We incur interest at a base rate plus applicable margin as defined within the agreement. The interest rate at June 30, 2025 was 7.82%.
(4)We incur interest at a base rate plus applicable margin as defined within the agreement. The interest rate at June 30, 2025 was 8.04%.
(5)We incur interest at a base rate plus applicable margin as defined within the agreement. The interest rate at June 30, 2025 was 7.98%.
7.5% Senior Secured Notes due 2028
In April 2021, we issued $250.0 million in aggregate principal amount of 7.5% senior secured notes due April 1, 2028 (the "2028 Notes"). We received proceeds of $245.2 million, after payment of certain financing fees and related expenses. The 2028 Notes bear interest semi-annually in arrears on April 1 and October 1 of each year, which began on October 1, 2021, at a rate of 7.5% per annum in cash. The 2028 Notes are senior secured obligations of Century, ranking equally in right of payment with all existing and future senior indebtedness of Century, but effectively senior to unsecured debt to the extent of the value of collateral.
As of June 30, 2025, the total estimated fair value of the 2028 Notes was $254.1 million. Although we use quoted market prices for identical debt instruments, the markets on which they trade are not considered to be active and are therefore considered Level 2 fair value measurements.
2.75% Convertible Notes due 2028
In April 2021, we completed a private offering of $86.3 million aggregate principal amount of convertible senior notes due May 1, 2028 unless earlier converted, repurchased, or redeemed (the "Convertible Notes"). The Convertible Notes were issued at a price of 100% of their aggregate principal amount. We received proceeds of $83.7 million, after payment of certain financing fees and related expenses. The Convertible Notes bear interest semi-annually in arrears on May 1 and November 1 of each year at a rate of 2.75% per annum in cash.
The initial conversion rate for the Convertible Notes is 53.3547 shares of the Company's common stock per $1,000 principal amount of Convertible Notes, which is equivalent to an initial conversion price of approximately $18.74 per share of
the Company's common stock. The conversion rate and conversion price are subject to customary adjustments under certain circumstances in accordance with the terms of the indenture. As of June 30, 2025, the conversion rate remains unchanged.
The Convertible Notes are the Company’s senior unsecured obligations and rank senior in right of payment to any of the Company’s indebtedness that is expressly subordinated in right of payment to the Convertible Notes; equal in right of payment to any of the Company’s unsecured indebtedness that is not so subordinated; effectively junior in right of payment to any of the Company’s senior secured indebtedness to the extent of the value of the assets securing such indebtedness; and structurally junior to all indebtedness and other liabilities (including trade payables) of the Company’s subsidiaries.
As of June 30, 2025, the if-converted value of the Convertible Notes did not exceed the outstanding principal amount.
As of June 30, 2025, the total estimated fair value of the Convertible Notes was $103.3 million. Although we use quoted market prices for identical debt instruments, the markets on which they trade are not considered to be active and are therefore considered Level 2 fair value measurements.
U.S. Revolving Credit Facility
We and certain of our direct and indirect domestic subsidiaries have a senior secured revolving credit facility with a syndicate of lenders (as amended from time to time, the "U.S. revolving credit facility"). On June 14, 2022 we amended our U.S. revolving credit facility, increasing our borrowing capacity to $250.0 million in the aggregate, including up to $150.0 million under a letter of credit sub-facility. The U.S. revolving credit facility matures on June 14, 2027.
Any letters of credit issued and outstanding under the U.S. revolving credit facility reduce our borrowing availability on a dollar-for-dollar basis. At June 30, 2025, there were $19.6 million of outstanding borrowings and $47.3 million of outstanding letters of credit issued under our U.S. revolving credit facility. Principal payments, if any, are due upon maturity of the U.S. revolving credit facility and may be prepaid without penalty.
Status of our U.S. revolving credit facility:June 30, 2025
Credit facility maximum amount$250.0 
Borrowing availability208.6 
Outstanding letters of credit issued47.3 
Outstanding borrowings19.6 
Borrowing availability, net of outstanding letters of credit and borrowings141.8 
Iceland Revolving Credit Facility
Our wholly-owned subsidiary, Nordural Grundartangi ehf ("Grundartangi"), entered into a revolving credit facility agreement with Landsbankinn hf., dated November 2013, as amended (the "Iceland revolving credit facility"), which originally provided for borrowings of up to $50.0 million in the aggregate. On February 4, 2022, we amended the Iceland revolving credit facility and increased the facility amount to $80.0 million. On September 28, 2022, we further amended the Iceland revolving credit facility and increased the facility amount to $100.0 million in the aggregate. Under the terms of the Iceland revolving credit facility, when Grundartangi borrows funds it will designate a repayment date, which may be any date prior to the maturity of the Iceland revolving credit facility. At June 30, 2025, there were no outstanding borrowings under our Iceland revolving credit facility. The Iceland revolving credit facility has a term through December 2026.
Status of our Iceland revolving credit facility:June 30, 2025
Credit facility maximum amount$100.0 
Borrowing availability100.0 
Outstanding letters of credit issued— 
Outstanding borrowings— 
Borrowing availability, net of borrowings100.0 
Grundartangi Casthouse Facility
On November 2, 2021, in connection with the casthouse project at Grundartangi, we entered into an eight-year Term Facility Agreement with Arion Bank hf, to provide for borrowings up to $130.0 million (the "Casthouse Facility"). Under the Casthouse Facility, repayments of principal amounts will be made in equal quarterly installments equal to 1.739% of the principal amount, the first payment occurring in July 2024, with the remaining 60% of the principal amount to be paid no later than the termination date in December 2029. As of June 30, 2025, there were $117.7 million in outstanding borrowings under the Casthouse Facility.
Vlissingen Credit Facility
On December 9, 2022, Vlissingen entered into a $90.0 million Facility Agreement with Glencore International AG, which was amended and extended on October 1, 2024 (as amended, the "Vlissingen Credit Facility"). The availability period for borrowings under the Vlissingen Credit Facility was extended by two years and now ends on December 2, 2026. Pursuant to the terms of the Vlissingen Credit Facility, Vlissingen may borrow from time to time up to $90.0 million in one or more loans at either (i) a fixed interest rate equal to 8.75% per annum (the "Fixed Rate"), or (ii) a variable interest rate equal to the 1-month SOFR rate plus 3.687 percentage points, subject to an absolute maximum level of 9.00% and an absolute minimum level of 7.00% (the "Variable Rate"). The Fixed Rate is only applicable to borrowings made on or before December 1, 2024, after which the Variable Rate shall apply to all borrowings under the Vlissingen Credit Facility. As of June 30, 2025, there were $10.0 million in outstanding borrowings under the Vlissingen Credit Facility.
Hancock County Industrial Revenue Bonds
As part of the purchase price for our acquisition of the Hawesville facility, we assumed IRBs which were issued in connection with the financing of certain solid waste disposal facilities constructed at the Hawesville facility. The IRBs bear interest at a variable rate not to exceed 12% per annum determined weekly based upon prevailing rates for similar bonds in the industrial revenue bond market and interest on the IRBs is paid quarterly. The IRBs are secured by a letter of credit issued under our U.S. revolving credit facility and mature in April 2028.
Surety Bond Facility
As part of our normal business operations, we are required to provide surety bonds or issue letters of credit in certain states in which we do business as collateral for certain workers' compensation obligations. In June 2022, we entered into a surety bond facility with an insurance company to provide such bonds when applicable. As of June 30, 2025, we had issued surety bonds totaling $6.6 million. As we had previously guaranteed our workers' compensation obligations through issuance of letters of credit against our revolving credit facility, the surety bond issuance increases credit facility availability.
Covenant Compliance
As of June 30, 2025, we and our subsidiaries were in compliance with financial covenants or maintained availability above applicable covenant triggers.