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Derivative Financial Instruments and Related Hedging Programs, Realized and Unrealized Gains and Losses Table (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Derivative Instruments Gain Loss [Line Items] |  |  |
Unrealized Gain (Loss) on Derivatives | $ 18.7 | $ (3.4) | $ (6.8)
Foreign Exchange Contract | Designated as Hedging Instrument |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net | 0.0 | (0.3) | 0.0
Alloy Metal Hedge | Designated as Hedging Instrument |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net | (0.1) | 0.0 | 0.0
Operational Risk Hedges | Not Designated as Hedging Instrument |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Unrealized Gain (Loss) on Derivatives | 18.7 | (3.4) | (6.8)
Cost of Sales | Aluminum | Not Designated as Hedging Instrument |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Realized (losses) gains | (2.0) | (27.3) | 6.9
Cost of Sales | Natural Gas | Not Designated as Hedging Instrument |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Realized (losses) gains | (5.0) | (5.4) | 1.0
Cost of Sales | Electricity | Not Designated as Hedging Instrument |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Realized (losses) gains | 0.0 | (1.9) | (0.1)
Cost of Sales | Operational Risk Hedges | Not Designated as Hedging Instrument |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Realized (losses) gains | (7.1) | (34.6) | 7.8
Other Operating Income (Expense) | Foreign Exchange Contract | Not Designated as Hedging Instrument |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Realized (losses) gains | (0.1) | 0.0 | 0.0
Gain (Loss) on Derivative Instruments | Aluminum | Not Designated as Hedging Instrument |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Unrealized Gain (Loss) on Derivatives | 10.8 | (4.6) | (2.6)
Gain (Loss) on Derivative Instruments | Natural Gas | Not Designated as Hedging Instrument |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Unrealized Gain (Loss) on Derivatives | 7.9 | (0.5) | (6.0)
Gain (Loss) on Derivative Instruments | Electricity | Not Designated as Hedging Instrument |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Unrealized Gain (Loss) on Derivatives | 0.0 | 1.7 | (1.8)
Gain (Loss) on Derivative Instruments | Operational Risk Hedges | Not Designated as Hedging Instrument |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Unrealized Gain (Loss) on Derivatives | 18.7 | (3.4) | (10.4)
Other Expense | Not Designated as Hedging Instrument |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Unrealized Gain (Loss) on Derivatives | 0.0 | 0.0 | 3.6
Other Expense | Option Assets relating to the Convertible Notes3 | Not Designated as Hedging Instrument |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Unrealized Gain (Loss) on Derivatives | 0.0 | 0.0 | 5.2
Other Expense | Bifurcated Conversion Feature of the Convertible Notes | Not Designated as Hedging Instrument |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Unrealized Gain (Loss) on Derivatives | $ 0.0 | $ 0.0 | $ (1.6)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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- Definition 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. + References No definition available. + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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