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Derivatives, Hedging Programs and Other Financial Instruments - Summary of Loss (Gain) Associated with Derivative Contracts (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 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 cash flow hedges are recorded | $ 694.9 | $ 677.8 | $ 2,459.2 | $ 1,613.6
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 cash flow hedges are recorded | Total of income and expense line items presented in our Statements of Consolidated Income (Loss) in which the effects of cash flow hedges are recorded | Total of income and expense line items presented in our Statements of Consolidated Income (Loss) in which the effects of cash flow hedges are recorded | Total of income and expense line items presented in our Statements of Consolidated Income (Loss) in which the effects of cash flow hedges are recorded
Not Designated as Hedging Instrument |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Loss (gain) recognized in our Statements of Consolidated Income (Loss) | $ 0.3 | $ 0.7 | $ 1.1 | $ (1.8)
Not Designated as Hedging Instrument | Alloying Metals |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Loss (gain) recognized in our Statements of Consolidated Income (Loss) | (0.3) | (1.2) | (0.8) | (3.8)
Loss (gain) recognized in our Statements of Consolidated Income (Loss) Unrealized loss |  | 1.9 | 1.9 | 2.0
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 cash flow hedges are recorded | 694.9 | 677.8 | 2,459.2 | 1,613.6
Cash Flow Hedges | Designated as Hedging Instrument |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Loss (gain) recognized in our Statements of Consolidated Income (Loss) | 8.1 | (16.7) | (8.9) | (28.1)
Cash Flow Hedges | Designated as Hedging Instrument | Electricity |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Loss (gain) recognized in our Statements of Consolidated Income (Loss) | (3.8) | (2.6) | (5.2) | (3.3)
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) | (2.3) | (0.6) | (5.1) | (0.7)
Cash Flow Hedges | Designated as Hedging Instrument | Aluminum |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Loss (gain) recognized in our Statements of Consolidated Income (Loss) | $ 14.2 | (13.3) | $ (1.4) | (24.3)
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) |  | $ (0.2) |  | $ 0.2

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI https://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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