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Curtailment of Operations - Hawesville (Details) - Curtailment Of Operations - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 1,700,000	$ 4,400,000	$ 2,400,000	$ 11,400,000
Gain (loss) on material sales	$ 0	500,000	$ 500,000	1,200,000
Temporary Facility Closing, Excess Capacity
Restructuring Cost and Reserve [Line Items]
Excess capacity charges		$ 3,600,000		$ 9,000,000.0

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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