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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2024

Fair Value Disclosures [Abstract]

Schedule of financial assets and liabilities at fair value on a recurring basis

Recurring Fair Value Measurements						As of June 30, 2024
						Level 1						Level 2						Level 3						Total
ASSETS:
Cash equivalents						$	20.1					$	—					$	—					$	20.1
Trust assets(1)						1.2						—						—						1.2
Derivative instruments						—						5.5						—						5.5
TOTAL						$	21.3					$	5.5					$	—					$	26.8
LIABILITIES:
Derivative instruments						$	—					$	6.7					$	—					$	6.7
TOTAL						$	—					$	6.7					$	—					$	6.7

Recurring Fair Value Measurements						As of December 31, 2023
						Level 1						Level 2						Level 3						Total
ASSETS:
Cash equivalents						$	16.8					$	—					$	—					$	16.8
Trust assets(1)						0.2						—						—						0.2
Derivative instruments						—						2.9						—						2.9
TOTAL						$	17.0					$	2.9					$	—					$	19.9
LIABILITIES:
Derivative instruments						$	—					$	7.9					$	—					$	7.9
TOTAL						$	—					$	7.9					$	—					$	7.9

(1)Trust assets are currently invested in money market funds. These trust assets are held to fund the non-qualified supplemental executive pension benefit obligations for certain of our officers.

Schedule of valuation methodology for assets and liabilities at fair value

The following section describes the valuation techniques and inputs for fair value measurements categorized within Level 2 of the fair value hierarchy:

Level 2 Fair Value Measurements:

Asset / Liability

Valuation Techniques

Inputs

LME forward financial sales contracts

Discounted cash flows

Quoted LME forward market

Midwest Premium ("MWP") forward financial sales contracts

Discounted cash flows

Quoted MWP forward market

Fixed for floating swaps

Discounted cash flows

Quoted LME forward market, quoted MWP forward market

FX swaps

Discounted cash flows

Euro/USD forward exchange rate

Indiana Hub power price swaps

Discounted cash flows

Quoted Indiana Hub forward market

Casthouse currency hedges

Discounted cash flows

Euro/USD forward exchange rate; ISK/USD forward exchange rate

Heavy Fuel Oil ("HFO") price swaps

Discounted cash flows

Quoted HFO forward market

Schedule of fair value reconciliation of Level 3 assets and liabilities measured at fair value

The following table presents the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis. There was no activity related to Level 3 assets and liabilities measured at fair value on a recurring basis for the three and six months ended June 30, 2024.

						Level 3 Assets						Level 3 Liabilities
For the six months ended June 30, 2023						LME Forward financial sales contracts						LME forward financial sales contracts
Balance as of January 1, 2023						$	1.8					$	(4.6)
Transfers out of Level 3(1)						(1.8)						4.6
Balance as of June 30, 2023						$	—					$	—
Change in unrealized gains (losses)(2)						$	—					$	—

(1)Transfer out of Level 3 due to period of time remaining in derivative contract.

(2)Gains and losses are presented in the Consolidated Statement of Operations within the line item "Net gain (loss) on forward and derivative contracts."

X

- Definition

Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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-Name Accounting Standards Codification
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Tabular disclosure of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) using recurring unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

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-Topic 820
-SubTopic 10
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