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Revenue - Breakdown of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Net sales	$ 2,220.3	$ 2,185.4	$ 2,777.3
Contract liabilities	41.2	30.6
Aluminum
Disaggregation of Revenue [Line Items]
Net sales	1,882.1	1,972.6	2,750.3
Alumina
Disaggregation of Revenue [Line Items]
Net sales	338.2	212.8	27.0
United States
Disaggregation of Revenue [Line Items]
Net sales	1,427.0	1,358.6	1,737.2
Iceland
Disaggregation of Revenue [Line Items]
Net sales	$ 793.3	$ 826.8	$ 1,040.1

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