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Debt (Tables) | 9 Months Ended
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Sep. 30, 2025
Debt Disclosure [Abstract] |
Schedule of debt |
|  | September 30, 2025 |  | December 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) |  | — |  |  | 20.0 |
Iceland Revolving Credit Facility(3) |  | 16.5 |  |  | 34.0 |
Grundartangi Casthouse Facility, net of financing fees of $1.5 million at September 30, 2025(4) |  | 115.0 |  |  | 9.0 |
Debt classified as non-current liabilities: |  |  |  |
Grundartangi Casthouse Facility(4) |  | — |  |  | 114.2 |
Vlissingen Credit Facility(5) |  | — |  |  | 10.0 |
7.5% senior secured notes due April 1, 2028 |  | — |  |  | 248.1 |
2.75% convertible senior notes due May 1, 2028, net of financing fees of $0.9 million at September 30, 2025, interest payable semiannually |  | 85.4 |  |  | 85.1 |
6.875% senior secured notes due August 1, 2032, net of financing fees of $6.1 million at September 30, 2025, interest payable semiannually |  | 393.8 |  |  | — |
Total |  | $ | 618.5 |  |  | $ | 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 September 30, 2025 was 3.02%. (2)We incur interest at a base rate plus applicable margin as defined within the agreement. The interest rate at September 30, 2025 wa s 7.75%. (3)We incur interest at a base rate plus applicable margin as defined within the agreement. The interest rate at September 30, 2025 wa s 7.66%. (4)We incur interest at a base rate plus applicable margin as defined within the agreement. The interest rate at September 30, 2025 was 7.89%. (5)We incur interest at a base rate plus applicable margin as defined within the agreement. The interest rate at September 30, 2025 wa s 7.83%.
Schedule of line of credit facilities |
Status of our U.S. revolving credit facility: |  | September 30, 2025
Credit facility maximum amount |  | $ | 250.0 |
Borrowing availability |  | 212.8 |
Outstanding letters of credit issued |  | 49.5 |
Outstanding borrowings |  | — |
Borrowing availability, net of outstanding letters of credit and borrowings |  | 163.3 |
Status of our Iceland revolving credit facility: |  | September 30, 2025
Credit facility maximum amount |  | $ | 100.0 |
Borrowing availability |  | 100.0 |
Outstanding letters of credit issued |  | — |
Outstanding borrowings |  | 16.5 |
Borrowing availability, net of borrowings |  | 83.5 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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