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Revenue - Disaggregation of Revenue by Product Category (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Net sales	$ 628.1	$ 560.8	$ 1,262.0	$ 1,050.3
Aluminum
Disaggregation of Revenue [Line Items]
Net sales	568.6	454.9	1,104.4	904.3
Alumina
Disaggregation of Revenue [Line Items]
Net sales	$ 59.5	$ 105.9	$ 157.6	$ 146.0

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