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Debt (Tables)

12 Months Ended

Dec. 31, 2024

Debt Disclosure [Abstract]

Schedule of debt

			December 31,
			2024						2023
Debt classified as current liabilities:
Hancock County industrial revenue bonds ("IRBs") due April 2028, interest payable quarterly (variable interest rates (not to exceed 12%)) (1)			$	7.8					$	7.8
U.S. Revolving Credit Facility (2)			20.0						23.7
Iceland Revolving Credit Facility (3)			34.0						—
Grundartangi Casthouse Facility (4)			9.0						5.5
Iceland Term Facility			—						1.3
Vlissingen Facility Agreement (5)			—						10.0
Debt classified as non-current liabilities:
Grundartangi casthouse facility, net of financing fees of $0.0 million at December 31, 2024 (4)			114.2						98.8
Vlissingen Facility Agreement (5)			10.0						—
7.5% senior secured notes due April 1, 2028, net of financing fees of $1.9 million at December 31, 2024, interest payable semiannually			248.1						247.4
2.75% convertible senior notes due May 1, 2028, net of financing fees of $1.2 million at December 31, 2024, interest payable semiannually			85.1						84.7
Total			$	528.2					$	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 December 31, 2024 was 3.75%.

(2)We incur interest at a base rate plus applicable margin as defined within the agreement. The interest rate at December 31, 2024 was 8.00%.

(3)We incur interest at a base rate plus applicable margin as defined within the agreement. The interest rate at December 31, 2024 was 7.84%.

(4)We incur interest at a base rate plus applicable margin as defined within the agreement. The interest rate at December 31, 2024 was 8.06%.

(5)We incur interest at a base rate plus applicable margin as defined within the agreement. The interest rate at December 31, 2024 was 7.99%

Schedule of debt redemption rights

Redemption Rights. Prior to April 1, 2024, we may redeem the 2028 Notes, in whole or in part, at a redemption price equal to 100.00% of the principal amount plus a make-whole premium and accrued and unpaid interest, and if redeemed during the twelve-month period beginning on April 1 of the years indicated below, at the following redemption prices plus accrued and unpaid interest:

Year			Percentage
2024			103.750%
2025			101.875%
2026 and Thereafter			100.000%

Schedule of line of credit facilities

Status of our U.S. revolving credit facility:			December 31, 2024
Credit facility maximum amount			$	250.0
Borrowing availability			149.3
Outstanding letters of credit issued			63.7
Outstanding borrowings			20.0
Borrowing availability, net of outstanding letters of credit and borrowings			65.6

Status of our Iceland revolving credit facility:			December 31, 2024
Credit facility maximum amount			$	100.0
Borrowing availability			100.0
Outstanding letters of credit issued			—
Outstanding borrowings			34.0
Borrowing availability, net of outstanding letters of credit and borrowings			66.0

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-Topic 210
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-Name Accounting Standards Codification
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