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Business Segments - Segment Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting, Asset Reconciling Item [Line Items]
TOTAL	$ 1,939.4	$ 1,846.5	$ 1,472.0
Capital expenditures	82.3	95.0	86.3
Aluminum
Segment Reporting, Asset Reconciling Item [Line Items]
TOTAL	1,896.6	1,808.1	1,432.4
Corporate, unallocated
Segment Reporting, Asset Reconciling Item [Line Items]
TOTAL	$ 42.8	$ 38.4	$ 39.6

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Amount of asset recognized for present right to economic benefit.

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