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Derivatives, Hedging Programs and Other Financial Instruments, Fair Value Hierarchy Table (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | $ 6.7 | $ 4.3
Derivative liability | (9.2) | (15.9)
Cash and cash equivalents | 115.3 | 125.6
Total | 137.6 | 162.3
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 29.3 | 22.9
Total | 29.3 | 22.9
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 6.7 | 4.3
Derivative liability | (9.2) | (15.9)
Derivative Assets (Liabilities), at Fair Value, Net | (2.5) | (11.6)
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 0.0 | 0.0
Total | 0.0 | 0.0
Designated as Hedging Instrument | Purchase |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liability | (6.0) | (12.6)
Designated as Hedging Instrument | Purchase | Aluminum | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 0.6 | 0.1
Derivative liability | (7.9) | (13.2)
Derivative Assets (Liabilities), at Fair Value, Net | (7.3) | (13.1)
Designated as Hedging Instrument | Purchase | Midwest premium swap contracts | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 2.8 | 3.2
Derivative liability | (0.2) | (0.5)
Derivative Assets (Liabilities), at Fair Value, Net | 2.6 | 2.7
Designated as Hedging Instrument | Purchase | Alloy Metal Hedge | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 0.9 | 0.0
Derivative liability | (0.3) | (1.7)
Derivative Assets (Liabilities), at Fair Value, Net | 0.6 | (1.7)
Designated as Hedging Instrument | Purchase | Natural Gas | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 0.4 | 0.2
Derivative liability | (0.8) | (0.5)
Derivative Assets (Liabilities), at Fair Value, Net | (0.4) | (0.3)
Designated as Hedging Instrument | Purchase | Electricity | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 2.0 | 0.7
Derivative liability | 0.0 | 0.0
Derivative Assets (Liabilities), at Fair Value, Net | 2.0 | 0.7
Designated as Hedging Instrument | Sales | Aluminum | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 0.0 | 0.1
Derivative liability | 0.0 | 0.0
Derivative Assets (Liabilities), at Fair Value, Net | 0.0 | 0.1
Debt Securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 22.3 | 36.7
Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 0.0 | 0.0
Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 86.0 | 102.7
Short-term investments | 22.3 | 36.7
Total | 108.3 | 139.4
Debt Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | $ 0.0 | $ 0.0

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