Related Party Transactions - Schedule of Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Related Party Transaction [Line Items]
Net sales	$ 752.1	$ 628.1	$ 1,401.3	$ 1,262.0
Related Party
Related Party Transaction [Line Items]
Net sales	330.9	367.6	636.8	746.3
Related Party \| Glencore
Related Party Transaction [Line Items]
Net sales	330.9	367.6	636.8	746.3
Purchases from Glencore	$ 104.3	$ 51.8	$ 168.5	$ 140.1

The aggregate cost of goods produced and sold and services rendered during the reporting period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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