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Derivative Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Components of gain (loss) on derivatives, net | Current period settlements on derivative contracts and Loss on derivatives, net were as follows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (in millions)
Current period settlement on derivative contracts | $ | (16.6 | ) |  | $ | 36.4 |  |  | $ | (26.0 | )
Loss on derivatives, net | (69.8 | ) |  | (19.4 | ) |  | (28.6 | )
Schedule of offsetting liabilities | The offsetting assets and liabilities for the Refining Partnership's derivatives as of December 31, 2017 and 2016 are recorded as current assets and current liabilities in prepaid expenses and other current assets and accrued expenses and other current liabilities, respectively, in the Consolidated Balance Sheets as follows:
| As of December 31, 2017
Description | Gross Current Assets |  | Gross Amounts Offset |  | Net Current Assets Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | 7.0 |  |  | $ | (7.0 | ) |  | $ | — |  |  | $ | — |  |  | $ | — |
Total | $ | 7.0 |  |  | $ | (7.0 | ) |  | $ | — |  |  | $ | — |  |  | $ | — |
| As of December 31, 2017
Description | Gross Current Liabilities |  | Gross Amounts Offset |  | Net Current Liabilities Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | 71.3 |  |  | $ | (7.0 | ) |  | $ | 64.3 |  |  | $ | — |  |  | $ | 64.3 |
Total | $ | 71.3 |  |  | $ | (7.0 | ) |  | $ | 64.3 |  |  | $ | — |  |  | $ | 64.3 |
| As of December 31, 2016
Description | Gross Current Liabilities |  | Gross Amounts Offset |  | Net Current Liabilities Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | 11.1 |  |  | $ | — |  |  | $ | 11.1 |  |  | $ | — |  |  | $ | 11.1 |
Total | $ | 11.1 |  |  | $ | — |  |  | $ | 11.1 |  |  | $ | — |  |  | $ | 11.1 |
Schedule of offsetting assets | The offsetting assets and liabilities for the Refining Partnership's derivatives as of December 31, 2017 and 2016 are recorded as current assets and current liabilities in prepaid expenses and other current assets and accrued expenses and other current liabilities, respectively, in the Consolidated Balance Sheets as follows:
| As of December 31, 2017
Description | Gross Current Assets |  | Gross Amounts Offset |  | Net Current Assets Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | 7.0 |  |  | $ | (7.0 | ) |  | $ | — |  |  | $ | — |  |  | $ | — |
Total | $ | 7.0 |  |  | $ | (7.0 | ) |  | $ | — |  |  | $ | — |  |  | $ | — |
| As of December 31, 2017
Description | Gross Current Liabilities |  | Gross Amounts Offset |  | Net Current Liabilities Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | 71.3 |  |  | $ | (7.0 | ) |  | $ | 64.3 |  |  | $ | — |  |  | $ | 64.3 |
Total | $ | 71.3 |  |  | $ | (7.0 | ) |  | $ | 64.3 |  |  | $ | — |  |  | $ | 64.3 |
| As of December 31, 2016
Description | Gross Current Liabilities |  | Gross Amounts Offset |  | Net Current Liabilities Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | 11.1 |  |  | $ | — |  |  | $ | 11.1 |  |  | $ | — |  |  | $ | 11.1 |
Total | $ | 11.1 |  |  | $ | — |  |  | $ | 11.1 |  |  | $ | — |  |  | $ | 11.1 |

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