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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

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

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

Recurring Fair Value Measurements						As of December 31, 2022
						Level 1						Level 2						Level 3						Total
ASSETS:
Cash equivalents						$	5.6					$	—					$	—					$	5.6
Trust assets (1)						0.1						—						—						0.1
Derivative instruments						—						127.3						1.8						129.1
TOTAL						$	5.7					$	127.3					$	1.8					$	134.8
LIABILITIES:
Contingent obligation – net (2)						$	—					$	—					$	—					$	—
Derivative instruments						—						26.4						4.6						31.0
TOTAL						$	—					$	26.4					$	4.6					$	31.0

(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.

(2)See Note 17. Commitments and Contingencies for additional information about the contingent obligation.

Schedule of valuation methodology for assets and liabilities at fair value

The following section describes the valuation techniques and inputs used for fair value measurements categorized within Level 2 or Level 3 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

Fixed for floating swaps

Discounted cash flows

Quoted LME forward market, quoted MWP forward market

Nord Pool power price swaps

Discounted cash flows

Quoted Nord Pool forward market

Indiana Hub power price swaps

Discounted cash flows

Quoted Indiana Hub forward market

FX swaps

Discounted cash flows

Euro/USD forward exchange rate

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

The following table presents the inputs for fair value measurements categorized within Level 3 of the fair value hierarchy, along with information regarding significant unobservable inputs used to value Level 3 assets and liabilities:

Level 3 Fair Value Measurements:

As of December 31, 2023

As of December 31, 2022

Asset / Liability

Valuation Technique

Observable Inputs

Significant Unobservable Input

Fair Value

Value/Range of Unobservable Input

Fair Value

Value/Range of Unobservable Input

LME forward financial sales contracts

Discounted cash flows

Quoted LME forward market

Discount rate net (1)

$

—

8.58%

$

(2.8)

8.58%

(1) Represents risk adjusted discount rate

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.

For the twelve months ended December 31, 2023						Level 3 Assets						Level 3 Liabilities
						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 December 31, 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.

+ References

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-Paragraph 2
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-SubTopic 10
-Topic 820
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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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://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-SubTopic 10
-Topic 820
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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-Topic 820
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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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