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Derivatives, Hedging Programs and Other Financial Instruments - Summary of Loss (Gain) Associated with Derivative Contracts (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Derivative Instruments Gain Loss [Line Items] |  |  |
Total of income and expense line items presented in our Statements of Consolidated Income (loss) in which the effects of cashflow hedges are recorded | $ 2,754.9 | $ 3,180.2 | $ 2,348.1
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Total of income and expense line items presented in our Statements of Consolidated Income (loss) in which the effects of cashflow hedges are recorded | Total of income and expense line items presented in our Statements of Consolidated Income (loss) in which the effects of cashflow hedges are recorded | Total of income and expense line items presented in our Statements of Consolidated Income (loss) in which the effects of cashflow hedges are recorded
Not Designated as Hedging Instrument |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Loss (gain) recognized in our Statements of Consolidated Income (Loss) | $ 0.1 | $ 0.9 | $ (3.8)
Not Designated as Hedging Instrument | Alloying Metals |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Loss (gain) recognized in our Statements of Consolidated Income (Loss) | 0.1 | (0.5) | (5.0)
Loss (gain) recognized in our Statements of Consolidated Income - Unrealized loss |  | 1.4 | 1.2
Cash Flow Hedges |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Total of income and expense line items presented in our Statements of Consolidated Income (loss) in which the effects of cashflow hedges are recorded | 2,754.9 | 3,180.2 | 2,348.1
Cash Flow Hedges | Designated as Hedging Instrument |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Loss (gain) recognized in our Statements of Consolidated Income (Loss) | 12.9 | (10.5) | (41.9)
Cash Flow Hedges | Designated as Hedging Instrument | Aluminum |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Loss (gain) recognized in our Statements of Consolidated Income (Loss) | 12.8 | 7.4 | (35.2)
Cash Flow Hedges | Designated as Hedging Instrument | Alloying Metals |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Loss (gain) recognized in our Statements of Consolidated Income (Loss) |  |  | 0.1
Cash Flow Hedges | Designated as Hedging Instrument | Natural Gas |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Loss (gain) recognized in our Statements of Consolidated Income (Loss) | $ 0.1 | (6.6) | (2.1)
Cash Flow Hedges | Designated as Hedging Instrument | Electricity |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Loss (gain) recognized in our Statements of Consolidated Income (Loss) |  | $ (11.3) | $ (4.7)

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