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DERIVATIVE INSTRUMENTS (Tables) | 3 Months Ended
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Mar. 31, 2019
Derivative [Line Items] |
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:
|  | (In Millions)
|  | Derivative Assets |  | Derivative Liabilities
|  | March 31, 2019 |  | December 31, 2018 |  | March 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 |  | $ | 0.7 |  |  | Derivative assets |  | $ | 0.1 |  |  | Other current liabilities |  | $ | 0.7 |  |  | Other current liabilities |  | $ | 3.7 |
Derivatives not designated as hedging instruments under ASC 815: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer supply agreement |  | Derivative assets |  | $ | 106.4 |  |  | Derivative assets |  | $ | 89.3 |  |  |  |  | $ | — |  |  |  |  | $ | — |
Provisional pricing arrangements |  | Derivative assets |  | 0.3 |  |  | Derivative assets |  | 2.1 |  |  | Other current liabilities |  | 9.8 |  |  |  |  | — |
Total derivatives not designated as hedging instruments under ASC 815 |  |  |  | $ | 106.7 |  |  |  |  | $ | 91.4 |  |  |  |  | $ | 9.8 |  |  |  |  | $ | — |
Total derivatives |  |  |  | $ | 107.4 |  |  |  |  | $ | 91.5 |  |  |  |  | $ | 10.5 |  |  |  |  | $ | 3.7 |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] | The following table presents our outstanding hedge contracts:
| (In Millions)
| March 31, 2019 |  | December 31, 2018
| Notional Amount |  | Unit of Measure |  | Varying Maturity Dates |  | Notional Amount |  | Unit of Measure |  | Varying Maturity Dates
Natural gas | 4.0 |  | MMBtu |  | April 2019 - February 2020 |  | 1.8 |  | MMBtu |  | January 2019 - August 2019
Diesel | 7.5 |  | Gallons |  | April 2019 - December 2019 |  | 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 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,
|  |  | 2019 |  | 2018
| Customer supply agreements | Product revenues | $ | 17.1 |  |  | $ | 41.9 |
| Provisional pricing arrangements | Product revenues | (11.6 | ) |  | 1.9 |
| Total |  | $ | 5.5 |  |  | $ | 43.8 |

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