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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Total of income and expense line items presented in our Statements of Consolidated (Loss) Income in which the effects of cash flow hedges are recorded | $ 224.5 | $ 303.5 | $ 511.1 | $ 618.6
Total of income and expense line items presented in our Statements of Consolidated (Loss) Income in which the effects of fair value hedges are recorded | 13.0 | 12.1 | 26.2 | 24.0
Depreciation and Amortization | Designated as Hedging Instrument | Foreign Exchange Contract |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Foreign exchange contracts | (0.2) |  |  |
Cash Flow Hedges | Cost of Sales | Designated as Hedging Instrument |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Loss recognized in our Statements of Consolidated (Loss) Income related to cash flow hedges | 10.5 | 4.7 | 17.5 | 8.9
Cash Flow Hedges | Cost of Sales | Designated as Hedging Instrument | Electricity |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Loss recognized in our Statements of Consolidated (Loss) Income related to cash flow hedges | 0.3 |  | 0.5 |
Cash Flow Hedges | Cost of Sales | Designated as Hedging Instrument | Aluminum |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Loss recognized in our Statements of Consolidated (Loss) Income related to cash flow hedges | 7.6 | 4.5 | 13.3 | 8.7
Cash Flow Hedges | Cost of Sales | Designated as Hedging Instrument | Alloying Metals |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Loss recognized in our Statements of Consolidated (Loss) Income related to cash flow hedges | 1.5 | 0.1 | 2.1 | $ 0.2
Cash Flow Hedges | Cost of Sales | Designated as Hedging Instrument | Alloying Metals (Reclassification Due To Forecasted Transactions No Longer Probable of Occuring |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Alloying metals (reclassification due to forecasted transactions no longer probable of occurring) | 0.7 |  | 0.7 |
Cash Flow Hedges | Cost of Sales | Designated as Hedging Instrument | Natural Gas |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Loss recognized in our Statements of Consolidated (Loss) Income related to cash flow hedges | 0.4 | $ 0.1 | 0.9 |
Fair Value Hedges | Depreciation and Amortization | Designated as Hedging Instrument | Foreign Exchange Contract |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Loss recognized in our Statements of Consolidated (Loss) Income related to cash flow hedges | 0.1 |  | 0.3 |
Hedged item | 0.2 |  |  |
Excluded component amortized from AOCI | 0.2 |  | 0.4 |
Reclassification from AOCI related to early termination of firm commitment | (0.4) |  | (0.4) |
Net settlement related to early termination of forward contracts | $ 0.3 |  | $ 0.3 |

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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=109977999&loc=d3e76258-113986 + Details
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