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Derivatives, Hedging Programs and Other Financial Instruments, Fair Value Hierarchy Table (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | $ 125.6 | $ 51.1
Derivative Asset | (4.3) | (25.3)
Derivative Liability | (15.9) | (0.8)
Other Assets, Fair Value Disclosure | 162.3 | 234.8
Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 36.7 | 183.7
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 22.9 | 23.5
Other Assets, Fair Value Disclosure | 22.9 | 23.5
Level 1 | Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 102.7 | 27.6
Derivative Asset | (4.3) | (25.3)
Derivative Liability | (15.9) | (0.8)
Other Assets, Fair Value Disclosure | 139.4 | 211.3
Fair Value, Inputs, Level 2 [Member] | Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 36.7 | 183.7
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 0.0 | 0.0
Other Assets, Fair Value Disclosure | 0.0 | 0.0
Level 3 | Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale Securities | 0.0 | 0.0
Not Designated as Hedging Instrument | Fair Value, Inputs, Level 2 [Member] | Aluminum Member | Long |  |
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
Not Designated as Hedging Instrument | Fair Value, Inputs, Level 2 [Member] | Aluminum Member | Short |  |
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)
Not Designated as Hedging Instrument | Fair Value, Inputs, Level 2 [Member] | Midwest premium swap contracts | Long |  |
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)
Not Designated as Hedging Instrument | Fair Value, Inputs, Level 2 [Member] | Natural Gas Member | Long |  |
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)
Not Designated as Hedging Instrument | Fair Value, Inputs, Level 2 [Member] | Electricity [Member] | Long |  |
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)
Designated as Hedging Instrument | Fair Value, Inputs, Level 2 [Member] | Aluminum Member | Long |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | (0.1) | 0.0
Derivative Liability | (13.2) | 0.0
Designated as Hedging Instrument | Fair Value, Inputs, Level 2 [Member] | Aluminum Member | Short |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | (0.1) | 0.0
Derivative Liability | 0.0 | 0.0
Designated as Hedging Instrument | Fair Value, Inputs, Level 2 [Member] | Midwest premium swap contracts | Long |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | (3.2) | 0.0
Derivative Liability | (0.5) | 0.0
Designated as Hedging Instrument | Fair Value, Inputs, Level 2 [Member] | Natural Gas Member | Long |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | (0.2) | 0.0
Derivative Liability | (0.5) | 0.0
Designated as Hedging Instrument | Fair Value, Inputs, Level 2 [Member] | Electricity [Member] | Long |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | (0.7) | 0.0
Derivative Liability | 0.0 | 0.0
Designated as Hedging Instrument | Fair Value, Inputs, Level 2 [Member] | Alloy Metal Hedge | Long |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 0.0 | (0.9)
Derivative Liability | $ (1.7) | $ 0.0

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