Related Party Transactions - Narrative (Details) carbon_credit in Thousands, € in Millions, $ in Millions			3 Months Ended		9 Months Ended
	Dec. 21, 2023 EUR (€) € / carbonCredit	Sep. 28, 2023 EUR (€) carbon_credit € / carbonCredit	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 09, 2022 USD ($)
Vlissingen facility agreement | Affiliated Entity | Vlissingen
Related Party Transaction [Line Items]
Credit facility maximum amount | $							$ 90.0
Stated interest rate, percentage							8.75%
Carbon Credit Sale | Affiliated Entity | Grundartangi
Related Party Transaction [Line Items]
Carbon credit sold in transaction | carbon_credit		390
Sale price (Euro per carbon credit) | € / carbonCredit		82.18
Aggregate amount | €		€ 32.1
Carbon Credit Repurchase | Affiliated Entity | Grundartangi | Forecast
Related Party Transaction [Line Items]
Sale price (Euro per carbon credit) | € / carbonCredit	83.72
Aggregate amount | €	€ 32.7
Supply Commitment | Glencore
Related Party Transaction [Line Items]
Net sales to Glencore | $			$ 50.0	$ 4.9	$ 136.8	$ 18.8
Consolidated sales | Customer concentration risk | Glencore
Related Party Transaction [Line Items]
Major customer, percentage of revenue, net (percent)			73.50%	63.50%
Glencore
Related Party Transaction [Line Items]
Ownership percentage by noncontrolling owners			42.90%		42.90%
Economic ownership percentage by related party			46.00%		46.00%