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Derivatives (Tables)
 6 Months Ended
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, 2025December 31, 2024
Commodity contracts(1)
$4.6 $4.5 
Liability Fair Value
June 30, 2025December 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,
2025202420252024
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.