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DERIVATIVE INSTRUMENTS (Tables) | 6 Months Ended
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Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
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) |  | June 30, 2020 |  | December 31, 2019 |  | June 30, 2020 |  | December 31, 2019
Other current assets: |  |  |  |  |  |  |  |
Customer supply agreement |  | $ | — |  |  | $ | — |  |  | $ | 27.3 |  |  | $ | 44.5 |
Provisional pricing arrangements |  | — |  |  | — |  |  | 8.0 |  |  | 1.3 |
Commodity contracts |  | 1.6 |  |  | — |  |  | 3.8 |  |  | — |
Other non-current assets: |  |  |  |  |  |  |  |
Commodity contracts |  | 0.6 |  |  | — |  |  | 0.1 |  |  | — |
Other current liabilities: |  |  |  |  |  |  |  |
Provisional pricing arrangements |  | — |  |  | — |  |  | — |  |  | (1.1 | )
Commodity contracts |  | (14.2 | ) |  | (3.2 | ) |  | (3.0 | ) |  | — |
Foreign exchange contracts |  | (1.0 | ) |  | — |  |  | — |  |  | — |
Other non-current liabilities: |  |  |  |  |  |  |  |
Commodity contracts |  | (0.9 | ) |  | — |  |  | (0.2 | ) |  | — |
Foreign exchange contracts |  | (0.4 | ) |  | — |  |  | — |  |  | — |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] | The following table presents our outstanding hedge contracts:
|  |  |  | (In Millions)
|  |  |  | June 30, 2020 |  | December 31, 2019
|  | Unit of Measure |  | Maturity Dates | Notional Amount |  | Notional Amount
Commodity contracts: |  |  |  |  |  |  |
Natural gas |  | MMBtu |  | July 2020 - December 2021 | 39.2 |  |  | 20.1 |
Diesel |  | Gallons |  | — | — |  |  | 0.8 |
Zinc |  | Pounds |  | July 2020 - December 2021 | 18.2 |  |  | — |
Electricity |  | Megawatt hours |  | July 2020 - December 2021 | 1.5 |  |  | — |
Foreign exchange contracts: |  |  |  |  |  |  |
Canadian dollars |  | CAD |  | July 2020 - December 2021 | C$ | 48.7 |  |  | C$ | — |
Derivative Instruments, Gain (Loss) [Table Text Block] | Estimated gains (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 Gains (Losses)
Natural gas |  | $ | (4.6 | )
Zinc |  | 0.6 |
Electricity |  | (1.0 | )
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 June 30, |  | Six Months Ended June 30,
| 2020 |  | 2019 | 2020 |  | 2019
| Customer supply agreements |  | Revenues |  | $ | 31.2 |  |  | $ | 57.5 |  |  | $ | 5.6 |  |  | $ | 74.6 |
| Provisional pricing arrangements |  | Revenues |  | 8.8 |  |  | 17.3 |  |  | 7.6 |  |  | 5.7 |
| Foreign exchange contracts |  | Other non-operating income |  | 0.1 |  |  | — |  |  | — |  |  | — |
| Commodity contracts |  | Cost of goods sold |  | 1.2 |  |  | — |  |  | (4.7 | ) |  | — |
| Total |  |  |  | $ | 41.3 |  |  | $ | 74.8 |  |  | $ | 8.5 |  |  | $ | 80.3 |

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