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DERIVATIVE INSTRUMENTS (Tables) | 3 Months Ended
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Mar. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Derivative Instruments, Gain (Loss) [Table Text Block] | Estimated losses before tax expected to be reclassified into Cost of goods sold within the next 12 months for our existing derivatives that qualify as cash flow hedges are presented below:
|  | (In Millions)
Hedge: |  | Estimated Losses
Natural gas |  | $ | (7.0 | )
Zinc |  | (0.2 | )
Electricity |  | (1.5 | )
Canadian dollars |  | (0.2 | )
Schedule Of Derivative Instruments In Statement Of Financial Position, Fair Value | The following table presents the fair value of our derivative instruments and the classification of each in the Statements of Unaudited Condensed Consolidated Financial Position:
|  | Derivatives designated as hedging instruments under Topic 815: |  | Derivatives not designated as hedging instruments under Topic 815:
Derivative Asset (Liability) |  | March 31, 2020 |  | December 31, 2019 |  | March 31, 2020 |  | December 31, 2019
Other current assets: |  |  |  |  |  |  |  |
Customer supply agreement |  | $ | — |  |  | $ | — |  |  | $ | 19.0 |  |  | $ | 44.5 |
Provisional pricing arrangements |  | — |  |  | — |  |  | 0.6 |  |  | 1.3 |
Commodity contracts |  | 0.3 |  |  | — |  |  | 1.3 |  |  | — |
Other current liabilities: |  |  |  |  |  |  |  |
Provisional pricing arrangements |  |  |  |  |  | — |  |  | (1.1 | )
Commodity contracts |  | (25.9 | ) |  | (3.2 | ) |  | (0.6 | ) |  | — |
Foreign exchange contracts |  | (1.6 | ) |  | — |  |  | — |  |  | — |
Other non-current liabilities: |  |  |  |  |  |  |  |
Commodity contracts |  | (2.8 | ) |  | — |  |  | (0.6 | ) |  | — |
Foreign exchange contracts |  | (0.9 | ) |  | — |  |  | — |  |  | — |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] | The following table presents our outstanding hedge contracts:
|  |  |  | (In Millions)
|  |  |  | March 31, 2020 |  | December 31, 2019
|  | Unit of Measure |  | Maturity Dates | Notional Amount |  | Notional Amount
Commodity contracts: |  |  |  |  |  |  |
Natural gas |  | MMBtu |  | April 2020 - December 2021 | 50.4 |  |  | 20.1 |
Diesel |  | Gallons |  | — | — |  |  | 0.8 |
Zinc |  | Pounds |  | April 2020 - December 2021 | 28.8 |  |  | — |
Electricity |  | Megawatt hours |  | April 2020 - December 2021 | 1.5 |  |  | — |
Foreign exchange contracts: |  |  |  |  |  |  |
Canadian dollars |  | CAD |  | April 2020 - December 2021 | C$ | 58.7 |  |  | C$ | — |
Schedule Of Derivatives Not Designated As Hedging Instruments Statements Of Financial Performance Location Table | The following summarizes the effect of our derivatives that are not designated as hedging instruments in the Statements of Unaudited Condensed Consolidated Operations:
|  |  |  | (In Millions)
| Derivatives Not Designated as Hedging Instruments |  | Location of Gain (Loss) Recognized in Income on Derivatives | Three Months Ended March 31,
| 2020 |  | 2019
| Customer supply agreements |  | Revenues | $ | (25.6 | ) |  | $ | 17.1 |
| Provisional pricing arrangements |  | Revenues | (1.2 | ) |  | (11.6 | )
| Foreign exchange contracts |  | Other non-operating income | (0.1 | ) |  | — |
| Commodity contracts |  | Cost of goods sold | (5.9 | ) |  | — |
| Total |  |  | $ | (32.8 | ) |  | $ | 5.5 |

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