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Derivatives, Hedging Programs and Other Financial Instruments, Fair Value Hierarchy Table (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and Cash Equivalents, Fair Value Disclosure | $ 135.0 | $ 51.1
Derivative Asset | (11.4) | (25.3)
Derivative Liability | (5.5) | (0.8)
Other Assets, Fair Value Disclosure | 218.8 | 234.8
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and Cash Equivalents, Fair Value Disclosure | 17.3 | 23.5
Other Assets, Fair Value Disclosure | 17.3 | 23.5
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and Cash Equivalents, Fair Value Disclosure | 117.7 | 27.6
Derivative Asset | 11.4 | 25.3
Derivative Liability | (5.5) | (0.8)
Derivative Asset, Fair Value, Gross Asset | (5.9) | (24.5)
Other Assets, Fair Value Disclosure | 201.5 | 211.3
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0.0 | 0.0
Other Assets, Fair Value Disclosure | 0.0 | 0.0
Not Designated as Hedging Instrument | Purchase | Aluminum Member | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 0.0 | 0.0
Derivative Liability | 0.0 | 0.1
Derivative Asset, Fair Value, Gross Liability | 0.0 | (0.1)
Not Designated as Hedging Instrument | Purchase | Midwest premium swap contracts | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 0.0 | (1.7)
Derivative Liability | 0.0 | 0.1
Derivative Asset, Fair Value, Gross Asset | 0.0 | 1.6
Not Designated as Hedging Instrument | Purchase | Natural Gas Member | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 0.0 | (0.2)
Derivative Liability | 0.0 | 0.5
Derivative Asset, Fair Value, Gross Liability | 0.0 | (0.3)
Not Designated as Hedging Instrument | Purchase | Electricity Member | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 0.0 | 0.0
Derivative Liability | 0.0 | 0.1
Derivative Asset, Fair Value, Gross Liability | 0.0 | (0.1)
Not Designated as Hedging Instrument | Sales | Aluminum Member | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 0.0 | (22.5)
Derivative Liability | 0.0 | 0.0
Derivative Asset, Fair Value, Gross Asset | 0.0 | 22.5
Designated as Hedging Instrument | Purchase |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Liability | (1.6) | (0.1)
Designated as Hedging Instrument | Purchase | Aluminum Member | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | (0.2) | 0.0
Derivative Liability | 0.0 | 0.0
Derivative Asset, Fair Value, Gross Asset | 0.2 | 0.0
Designated as Hedging Instrument | Purchase | Midwest premium swap contracts | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | (6.2) | 0.0
Derivative Liability | 0.1 | 0.0
Derivative Asset, Fair Value, Gross Asset | 6.1 | 0.0
Designated as Hedging Instrument | Purchase | Natural Gas Member | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | (0.1) | 0.0
Derivative Liability | 0.5 | 0.0
Derivative Asset, Fair Value, Gross Liability | (0.4) | 0.0
Designated as Hedging Instrument | Purchase | Electricity Member | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 0.0 | 0.0
Derivative Liability | 0.3 | 0.0
Derivative Asset, Fair Value, Gross Liability | (0.3) | 0.0
Designated as Hedging Instrument | Purchase | Alloy Metal Hedge | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | (0.3) | (0.9)
Derivative Liability | 0.2 | 0.0
Derivative Asset, Fair Value, Gross Asset | 0.1 | 0.9
Designated as Hedging Instrument | Sales | Aluminum Member | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | (4.6) | 0.0
Derivative Liability | 4.4 | 0.0
Derivative Asset, Fair Value, Gross Asset | 0.2 | 0.0
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 83.8 | 183.7
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 0.0 | 0.0
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 83.8 | 183.7
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 0.0 | 0.0
Other Current Assets [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | (9.0) | (18.9)
Other Assets [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | (2.4) | (6.4)
Other Current Liabilities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Liability | (3.1) | (0.3)
Other Noncurrent Liabilities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Liability | $ (2.4) | $ (0.5)

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226003-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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