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Debt (Tables)

3 Months Ended

Mar. 31, 2024

Debt Disclosure [Abstract]

Schedule of debt

						March 31, 2024						December 31, 2023
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)						17.0						23.7
Iceland Revolving Credit Facility(3)						32.0						—
Grundartangi Casthouse Facility(4)						9.1						5.5
Iceland Term Facility						—						1.3
Vlissingen Facility Agreement(5)						10.0						10.0
Debt classified as non-current liabilities:
Grundartangi casthouse facility, net of financing fees of $1.2 million at March 31, 2024(4)						119.8						98.8
7.5% senior secured notes due April 1, 2028, net of financing fees of $2.5 million at March 31, 2024, interest payable semiannually						247.5						247.4
2.75% convertible senior notes due May 1, 2028, net of financing fees of $1.4 million at March 31, 2024, interest payable semiannually						84.8						84.7
Total						$	528.0					$	479.2

(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 March 31, 2024 was 3.77%.

(2)We incur interest at a base rate plus applicable margin as defined within the agreement. The interest rate at March 31, 2024 was 9.25%.

(3)We incur interest at base rate plus applicable margin as defined within the agreement. The interest rate at March 31, 2024 was 8.83%.

(4)We incur interest at a base rate plus applicable margin as defined within the agreement. The interest rate at March 31, 2024 was 8.84%.

(5)We incur interest at a fixed rate equal to 8.75%.

Schedule of line of credit facilities

Status of our U.S. revolving credit facility:						March 31, 2024
Credit facility maximum amount						$	250.0
Borrowing availability						141.2
Outstanding letters of credit issued						58.0
Outstanding borrowings						17.0
Borrowing availability, net of outstanding letters of credit and borrowings						66.2

Status of our Iceland revolving credit facility:						March 31, 2024
Credit facility maximum amount						$	100.0
Borrowing availability						94.3
Outstanding letters of credit issued						—
Outstanding borrowings						32.0
Borrowing availability, net of borrowings						62.3

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- References

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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.

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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
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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