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Derivatives, Hedging Programs and Other Financial Instruments, Realized and Unrealized Gains and Losses Table (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of products sold, excluding depreciation and amortization and other items | $ 298.0 | $ 298.6 | $ 303.5 | $ 315.1 | $ 317.3 | $ 323.3 | $ 343.4 | $ 316.7 | $ 1,215.2 | [1] | $ 1,300.7 | [1] | $ 1,085.9 | [1]
Cost of Sales |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of products sold, excluding depreciation and amortization and other items |  |  |  |  |  |  |  |  |  |  |  |  | 1,105.3 |
Cost of Sales | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized (losses) gains |  |  |  |  |  |  |  |  | 19.7 |  | 2.8 |  | (0.9) |
Cost of Sales | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized (losses) gains |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  | (19.8) |
Cost of Sales | Aluminum | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized (losses) gains |  |  |  |  |  |  |  |  | 18.4 |  | 2.1 |  | 0.0 |
Cost of Sales | Aluminum | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized (losses) gains |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  | (20.4) |
Cost of Sales | Natural Gas | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized (losses) gains |  |  |  |  |  |  |  |  | 0.2 |  | (0.3) |  | 0.0 |
Cost of Sales | Natural Gas | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized (losses) gains |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  | 0.7 |
Cost of Sales | Alloy Metal Hedge | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized (losses) gains |  |  |  |  |  |  |  |  | 1.1 |  | 1.0 |  | (0.9) |
Cost of Sales | Foreign Exchange Contract | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized (losses) gains |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  | (0.1) |
Cost of Sales | Electricity | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized (losses) gains |  |  |  |  |  |  |  |  | $ 0.0 |  | $ 0.0 |  | 0.0 |
Gain (Loss) on Derivative Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized (losses) gains |  |  |  |  |  |  |  |  |  |  |  |  | (19.4) |
Gain (Loss) on Derivative Instruments | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized (losses) gains |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 |
Gain (Loss) on Derivative Instruments | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized (losses) gains |  |  |  |  |  |  |  |  |  |  |  |  | (19.4) |
Gain (Loss) on Derivative Instruments | Aluminum | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized (losses) gains |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 |
Gain (Loss) on Derivative Instruments | Aluminum | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized (losses) gains |  |  |  |  |  |  |  |  |  |  |  |  | (20.9) |
Gain (Loss) on Derivative Instruments | Natural Gas | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized (losses) gains |  |  |  |  |  |  |  |  |  |  |  |  | 1.4 |
Gain (Loss) on Derivative Instruments | Alloy Metal Hedge | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized (losses) gains |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 |
Gain (Loss) on Derivative Instruments | Foreign Exchange Contract | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized (losses) gains |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 |
Gain (Loss) on Derivative Instruments | Electricity | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized (losses) gains |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.1 |
[1] | See Note 8 for discussion of our adoption of ASU 2017-12 (as defined in Note 1) in 2018 and the related reclassification of amounts in 2017 that were presented in the Statements of Consolidated Income within Unrealized (gain) loss on derivative instruments and are now presented within Cost of products sold, excluding depreciation and amortization and other items ("Cost of products sold").

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