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Derivative Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Loss on derivatives, net and current period settlements | Loss on derivatives, net and current period settlements on derivative contracts were as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in millions)
Current period settlements on derivative contracts | $ | — |  |  | $ | 6.7 |  |  | $ | 1.1 |  |  | $ | 35.2 |
Loss on derivatives, net | (17.0 | ) |  | (1.7 | ) |  | (4.8 | ) |  | (4.8 | )
Derivative offsetting liabilities | The offsetting assets and liabilities for the Refining Partnership's derivatives as of September 30, 2017 and December 31, 2016 are recorded as current assets and current liabilities in prepaid expenses and other current assets and other current liabilities, respectively, in the Condensed Consolidated Balance Sheets as follows:
| As of September 30, 2017
Description | Gross Current Assets |  | Gross Amounts Offset |  | Net Current Assets Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | 0.2 |  |  | $ | (0.1 | ) |  | $ | 0.1 |  |  | $ | — |  |  | $ | 0.1 |
Total | $ | 0.2 |  |  | $ | (0.1 | ) |  | $ | 0.1 |  |  | $ | — |  |  | $ | 0.1 |
| As of September 30, 2017
Description | Gross Current Liabilities |  | Gross Amounts Offset |  | Net Current Liabilities Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | (21.4 | ) |  | $ | 4.2 |  |  | $ | (17.2 | ) |  | $ | — |  |  | $ | (17.2 | )
Total | $ | (21.4 | ) |  | $ | 4.2 |  |  | $ | (17.2 | ) |  | $ | — |  |  | $ | (17.2 | )
| 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 |
Derivative offsetting assets | The offsetting assets and liabilities for the Refining Partnership's derivatives as of September 30, 2017 and December 31, 2016 are recorded as current assets and current liabilities in prepaid expenses and other current assets and other current liabilities, respectively, in the Condensed Consolidated Balance Sheets as follows:
| As of September 30, 2017
Description | Gross Current Assets |  | Gross Amounts Offset |  | Net Current Assets Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | 0.2 |  |  | $ | (0.1 | ) |  | $ | 0.1 |  |  | $ | — |  |  | $ | 0.1 |
Total | $ | 0.2 |  |  | $ | (0.1 | ) |  | $ | 0.1 |  |  | $ | — |  |  | $ | 0.1 |
| As of September 30, 2017
Description | Gross Current Liabilities |  | Gross Amounts Offset |  | Net Current Liabilities Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | (21.4 | ) |  | $ | 4.2 |  |  | $ | (17.2 | ) |  | $ | — |  |  | $ | (17.2 | )
Total | $ | (21.4 | ) |  | $ | 4.2 |  |  | $ | (17.2 | ) |  | $ | — |  |  | $ | (17.2 | )
| 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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