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Derivatives, Hedging Programs and Other Financial Instruments, Fair Value Hierarchy Table (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | $ 1.8 | $ 4.0
Derivative liability | (30.8) | (11.2)
Cash and cash equivalents | 307.2 | 264.3
Total | 346.5 | 343.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total | 199.6 | 28.2
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 1.8 | 4.0
Derivative liability | (30.8) | (11.2)
Derivative Assets (Liabilities), at Fair Value, Net | (29.0) | (7.2)
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 | (29.2) | (7.2)
Debt Securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 39.3 | 78.7
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] |  |
Total | 146.9 | 314.8
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
Cash Flow Hedges | 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 | 0.0 | 1.0
Derivative liability | (14.2) | (4.1)
Derivative Assets (Liabilities), at Fair Value, Net | (14.2) | (3.1)
Cash Flow Hedges | 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 | 0.0 | 0.0
Derivative liability | (4.3) | (1.2)
Derivative Assets (Liabilities), at Fair Value, Net | (4.3) | (1.2)
Cash Flow Hedges | 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 | 0.0 | 0.4
Derivative liability | (5.5) | (1.5)
Derivative Assets (Liabilities), at Fair Value, Net | (5.5) | (1.1)
Cash Flow Hedges | 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 | 0.1 | 0.0
Derivative liability | (3.0) | (2.8)
Derivative Assets (Liabilities), at Fair Value, Net | (2.9) | (2.8)
Cash Flow Hedges | 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 | 1.6 | 2.6
Derivative liability | (2.8) | (1.6)
Derivative Assets (Liabilities), at Fair Value, Net | (1.2) | 1.0
Cash Flow Hedges | 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 | 0.1 | 0.0
Derivative liability | 0.0 | 0.0
Derivative Assets (Liabilities), at Fair Value, Net | 0.1 | 0.0
Fair Value Hedges | 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 | 0.0 | 0.0
Derivative liability | (1.0) | 0.0
Derivative Assets (Liabilities), at Fair Value, Net | $ (1.0) | $ 0.0

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