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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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 | $ 2,348.1 | $ 941.3 | $ 1,215.2
Total of income and expense line items presented in our Statements of Consolidated Income (loss) in which the effects of cashflow hedges are recorded | 91.5 | 52.2 | 49.1
Total of income and expense line items presented in our Statements of Consolidated Income (loss) in which the effects of cashflow hedges are recorded | (38.9) | (1.4) | (20.7)
(Gain) loss recognized in our Statements of Consolidated Income (Loss) |  | 0.3 |
Cost of Products Sold | Not Designated as Hedging Instrument |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
(Gain) loss recognized in our Statements of Consolidated Income (Loss) | (3.8) | (3.3) |
Cost of Products Sold | Not Designated as Hedging Instrument | Alloying Metals |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
(Gain) loss recognized in our Statements of Consolidated Income (Loss) | (5.0) | 0.2 |
Loss (gain) recognized in our Statements of Consolidated Income – Unrealized loss (gain) | 1.2 | (3.5) |
Depreciation and Amortization | Designated as Hedging Instrument | Euro |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Foreign exchange contracts |  | (0.1) |
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 | 2,348.1 | 941.3 | 1,215.2
Cash Flow Hedges | Cost of Products Sold | Designated as Hedging Instrument |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
(Gain) loss recognized in our Statements of Consolidated Income (Loss) | (41.9) | 17.7 | 19.7
Cash Flow Hedges | Cost of Products Sold | Designated as Hedging Instrument | Electricity |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
(Gain) loss recognized in our Statements of Consolidated Income (Loss) | (4.7) | 0.5 |
Cash Flow Hedges | Cost of Products Sold | Designated as Hedging Instrument | Aluminum |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
(Gain) loss recognized in our Statements of Consolidated Income (Loss) | (35.2) | 13.7 | 18.4
Cash Flow Hedges | Cost of Products Sold | Designated as Hedging Instrument | Alloying Metals |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
(Gain) loss recognized in our Statements of Consolidated Income (Loss) | 0.1 | 1.4 | 1.1
Cash Flow Hedges | Cost of Products Sold | Designated as Hedging Instrument | Alloying Metals (Reclassification Due To Forecasted Transactions No Longer Probable of Occurring) |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Alloying Metals (reclassification from AOCI due to forecasted transactions no longer probable of occurring) |  | 0.8 |
Cash Flow Hedges | Cost of Products Sold | Designated as Hedging Instrument | Natural Gas |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
(Gain) loss recognized in our Statements of Consolidated Income (Loss) | $ (2.1) | 1.3 | $ 0.2
Fair Value 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 |  | 52.2 |
Total of income and expense line items presented in our Statements of Consolidated Income (loss) in which the effects of cashflow hedges are recorded |  | 1.4 |
Fair Value Hedges | Depreciation and Amortization | Designated as Hedging Instrument | Euro |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Hedged item |  | 0.1 |
Excluded component amortized from AOCI |  | 0.4 |
Fair Value Hedges | Other Expense, Net | Designated as Hedging Instrument | Euro |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Reclassification from AOCI related to early termination of firm commitment |  | 0.6 |
Net settlement related to early termination of forward contracts |  | $ (0.7) |

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- Definition Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121577467&loc=d3e76258-113986 + Details
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