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Revenue - Breakdown of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 560.8	$ 575.5	$ 1,050.3	$ 1,127.9
Contract liabilities	42.4		42.4		$ 30.6
Aluminum
Disaggregation of Revenue [Line Items]
Revenue	454.9	509.7	904.3	1,041.1
Alumina
Disaggregation of Revenue [Line Items]
Revenue	105.9	65.8	146.0	86.8
United States
Disaggregation of Revenue [Line Items]
Revenue	375.0	363.2	675.0	705.5
Iceland
Disaggregation of Revenue [Line Items]
Revenue	$ 185.8	$ 212.3	$ 375.3	$ 422.4

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