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Revenue - Disaggregation of Revenue by Product Category (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Net sales	$ 633.9	$ 489.5
Aluminum
Disaggregation of Revenue [Line Items]
Net sales	535.8	449.4
Alumina
Disaggregation of Revenue [Line Items]
Net sales	$ 98.1	$ 40.1

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