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Fair Value Measurements (Tables) | 12 Months Ended
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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."

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- Definition 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 + Details
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- Definition 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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