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Debt
 6 Months Ended
Jun. 30, 2022
Debt Disclosure [Abstract]  
Debt Debt
June 30, 2022December 31, 2021
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)
15.0 63.6 
  Iceland Revolving Credit Facility (3)
35.0 50.0 
Debt classified as non-current liabilities:
Grundartangi casthouse facility, net of financing fees of $0.6 million at June 30, 2022(4)
39.4 — 
7.5% senior secured notes due April 1, 2028, net of financing fees of $3.8 million at June 30, 2022, interest payable semiannually
246.2 245.8 
2.75% convertible senior notes due May 1, 2028, net of financing fees of $2.1 million at June 30, 2022, interest payable semiannually
84.2 84.0 
Total$427.6 $451.2 
(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 IRBs interest rate at June 30, 2022 was 1.05%.
(2) We have elected to incur interest at a base rate plus applicable margin as defined within the agreement. The interest rate at June 30, 2022 was 5.50%.
(3) We have elected to incur interest at LIBOR plus applicable margin as defined within the agreement. The interest rate at June 30, 2022 was 4.68%.
(4) We incur interest at a base rate plus applicable margin as defined within the agreement. The interest rate at June 30, 2022 was 4.53%.

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, 2022, the total estimated fair value of the 2028 Notes was $225.7 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.
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, which began on November 1, 2021, 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, 2022, 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, 2022, the if-converted value of the Convertible Notes does not exceed the outstanding principal amount.
As of June 30, 2022, the total estimated fair value of the Convertible Notes was $66.2 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 (the "Borrowers") 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, 2022, there were $15.0 million in outstanding borrowings and $84.4 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, 2022
Credit facility maximum amount$250.0 
Borrowing availability250.0 
Outstanding letters of credit issued84.4 
Outstanding borrowings15.0 
Borrowing availability, net of outstanding letters of credit and borrowings150.6 
Iceland Revolving Credit Facility
Our wholly-owned subsidiary, Nordural Grundartangi ehf ("Grundartangi"), has entered into a $80.0 million revolving credit facility agreement with Landsbankinn hf., dated November 2013, as amended (the "Iceland revolving credit facility"). 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, 2022, there were $35.0 million in outstanding borrowings under our Iceland revolving credit facility. The Iceland revolving credit facility has a term through November 2024.
Status of our Iceland revolving credit facility:June 30, 2022
Credit facility maximum amount$80.0 
Borrowing availability80.0 
Outstanding letters of credit issued— 
Outstanding borrowings35.0 
Borrowing availability, net of borrowings45.0 
Grundartangi Casthouse Facility
Our wholly-owned subsidiary, Grundartangi, has entered into an eight-year Term Facility Agreement with Arion Bank hf, dated November 2021, as amended (the "Casthouse Facility") to provide for borrowings up to $130.0 million associated with construction of the new billet casthouse at Grundartangi (the"casthouse project"). 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, 2022, there were $40.0 million in outstanding borrowings under this Casthouse Facility.
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, 2022, 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.