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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Tables) | 12 Months Ended
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Dec. 31, 2019
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 Consolidated Financial Position:
| (In Millions)
| Derivative Assets |  | Derivative Liabilities
| December 31, 2019 |  | December 31, 2018 |  | December 31, 2019 |  | December 31, 2018
Derivative Instrument | Balance Sheet Location |  | Fair Value |  | Balance Sheet Location |  | Fair Value |  | Balance Sheet Location |  | Fair Value |  | Balance Sheet Location |  | Fair Value
Derivatives designated as hedging instruments under ASC 815: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | $ | — |  |  | Derivative assets |  | $ | 0.1 |  |  | Other current liabilities |  | $ | 3.2 |  |  | Other current liabilities |  | $ | 3.7 |
Derivatives not designated as hedging instruments under ASC 815: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer supply agreement | Derivative assets |  | 44.5 |  |  | Derivative assets |  | 89.3 |  |  |  |  | — |  |  |  |  | — |
Provisional pricing arrangements | Derivative assets |  | 1.3 |  |  | Derivative assets |  | 2.1 |  |  | Other current liabilities |  | 1.1 |  |  |  |  | — |
Total derivatives not designated as hedging instruments under ASC 815: |  |  | $ | 45.8 |  |  |  |  | $ | 91.4 |  |  |  |  | $ | 1.1 |  |  |  |  | $ | — |
Total derivatives |  |  | $ | 45.8 |  |  |  |  | $ | 91.5 |  |  |  |  | $ | 4.3 |  |  |  |  | $ | 3.7 |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] | The following table presents our outstanding hedge contracts:
|  | (Quantities in Millions)
|  | December 31, 2019 |  | December 31, 2018
|  | Notional Amount |  | Unit of Measure |  | Varying Maturity Dates |  | Notional Amount |  | Unit of Measure |  | Varying Maturity Dates
Natural gas |  | 20.1 |  | MMBtu |  | January 2020 - December 2021 |  | 1.8 |  | MMBtu |  | January 2019 - August 2019
Diesel |  | 0.8 |  | Gallons |  | January 2020 |  | 11.0 |  | Gallons |  | January 2019 - December 2019
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 Consolidated Operations:
|  |  |  | (In Millions)
Derivatives Not Designated as Hedging Instruments |  | Location of Gain (Loss) Recognized in Income on Derivative |  | Year Ended December 31,
|  |  |  | 2019 |  | 2018 |  | 2017
Customer supply agreements |  | Revenues from product sales and services |  | $ | 78.1 |  |  | $ | 425.8 |  |  | $ | 163.3 |
Provisional pricing arrangements |  | Revenues from product sales and services |  | (70.6 | ) |  | (3.2 | ) |  | (42.7 | )
Commodity contracts |  | Cost of goods sold and operating expenses |  | — |  |  | — |  |  | (1.3 | )
Total |  |  |  | $ | 7.5 |  |  | $ | 422.6 |  |  | $ | 119.3 |

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