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DERIVATIVE INSTRUMENTS (Tables) | 9 Months Ended
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Sep. 30, 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
|  | September 30, 2019 |  | December 31, 2018 |  | September 30, 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 |  |  | Derivative liabilities |  | $ | 2.4 |  |  | Derivative liabilities |  | $ | 3.7 |
Derivatives not designated as hedging instruments under ASC 815: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer supply agreement |  | Derivative assets |  | $ | 71.2 |  |  | Derivative assets |  | $ | 89.3 |  |  |  |  | $ | — |  |  |  |  | $ | — |
Provisional pricing arrangements |  | Derivative assets |  | 1.6 |  |  | Derivative assets |  | 2.1 |  |  | Derivative liabilities |  | 30.2 |  |  |  |  | — |
Total derivatives not designated as hedging instruments under ASC 815 |  |  |  | $ | 72.8 |  |  |  |  | $ | 91.4 |  |  |  |  | $ | 30.2 |  |  |  |  | $ | — |
Total derivatives |  |  |  | $ | 72.8 |  |  |  |  | $ | 91.5 |  |  |  |  | $ | 32.6 |  |  |  |  | $ | 3.7 |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] | The following table presents our outstanding hedge contracts:
| (In Millions)
| September 30, 2019 |  | December 31, 2018
| Notional Amount |  | Unit of Measure |  | Varying Maturity Dates |  | Notional Amount |  | Unit of Measure |  | Varying Maturity Dates
Natural gas | 7.0 |  | MMBtu |  | October 2019 - November 2020 |  | 1.8 |  | MMBtu |  | January 2019 - August 2019
Diesel | 2.4 |  | Gallons |  | October 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 September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2018 | 2019 |  | 2018
| Customer supply agreements |  | Product revenues |  | $ | 7.6 |  |  | $ | 139.7 |  |  | $ | 82.2 |  |  | $ | 337.1 |
| Provisional pricing arrangements |  | Product revenues |  | (48.5 | ) |  | (3.8 | ) |  | (38.8 | ) |  | (2.7 | )
| Total |  |  |  | $ | (40.9 | ) |  | $ | 135.9 |  |  | $ | 43.4 |  |  | $ | 334.4 |

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