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Derivatives (Tables) | 6 Months Ended
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Jun. 30, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of derivatives not designated as hedging instruments | The following tables set forth the Company's derivative assets and liabilities that were accounted for at fair value and not designated as cash flow hedges as of June 30, 2025 and December 31, 2024, respectively:
|  | Asset Fair Value
|  | June 30, 2025 |  | December 31, 2024
Commodity contracts(1) |  | $ | 4.6 |  |  | $ | 4.5 |
|  | Liability Fair Value
|  | June 30, 2025 |  | December 31, 2024
Commodity contracts(1) |  | $ | 19.8 |  |  | $ | 4.4 |
(1)Commodity contracts reflect our outstanding LME and MWP forward financial sales contracts, Indy Hub power price swaps, fixed for floating swaps, and HFO price swaps. At June 30, 2025, and December 31, 2024, there were no commodity contracts with Glencore.
Schedule of derivative instruments | The following table summarizes the net (loss) gain on forward and derivative contracts:
|  | Three months ended June 30, |  | Six months ended June 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Commodity contracts(1) |  | $ | (15.5) |  |  | $ | (4.0) |  |  | $ | (20.9) |  |  | $ | 3.5 |
Foreign exchange contracts |  | — |  |  | — |  |  | — |  |  | (0.1) |
Total |  | $ | (15.5) |  |  | $ | (4.0) |  |  | $ | (20.9) |  |  | $ | 3.4 |
(1)For the three and six months ended June 30, 2025, there were no forward and derivative contracts with Glencore. For the three and six months ended June 30, 2024, $1.9 million of the net loss and $2.5 million of the net gain was with Glencore, respectively.

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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References No definition available. + Details
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- Definition Tabular disclosure of derivative instrument not designated or qualifying as hedging instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4CC -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4CC Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B + Details
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