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Derivative Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Components of gain (loss) on derivatives, net | Gain (loss) on derivatives, net and current period settlements on derivative contracts were as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
| (in millions)
Current period settlements on derivative contracts | $ | (28.5 | ) |  | $ | 33.9 |  |  | $ | (34.8 | ) |  | $ | 55.0 |
Gain (loss) on derivatives, net | (12.6 | ) |  | 35.9 |  |  | (64.0 | ) |  | 145.3 |
Schedule of offsetting assets | The offsetting assets and liabilities for the Refining Partnership's derivatives as of June 30, 2015 are recorded as current assets, non-current assets and current liabilities in prepaid expenses and other current assets, other long-term assets and other current liabilities, respectively, in the Condensed Consolidated Balance Sheets as follows:
| As of June 30, 2015
Description | Gross Current Assets |  | Gross Amounts Offset |  | Net Current Assets Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | 16.4 |  |  | $ | (2.0 | ) |  | $ | 14.4 |  |  | $ | — |  |  | $ | 14.4 |
Total | $ | 16.4 |  |  | $ | (2.0 | ) |  | $ | 14.4 |  |  | $ | — |  |  | $ | 14.4 |
| As of June 30, 2015
Description | Gross Non-Current Assets |  | Gross Amounts Offset |  | Net Non-Current Assets Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | 8.6 |  |  | $ | (0.1 | ) |  | $ | 8.5 |  |  | $ | — |  |  | $ | 8.5 |
Total | $ | 8.6 |  |  | $ | (0.1 | ) |  | $ | 8.5 |  |  | $ | — |  |  | $ | 8.5 |
The offsetting assets and liabilities for the Refining Partnership's derivatives as of December 31, 2014 are recorded as current assets and non-current assets in prepaid expenses and other current assets and other long-term assets, respectively, in the Condensed Consolidated Balance Sheets as follows:
| As of December 31, 2014
Description | Gross Current Assets |  | Gross Amounts Offset |  | Net Current Assets Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | 25.3 |  |  | $ | (0.3 | ) |  | $ | 25.0 |  |  | $ | — |  |  | $ | 25.0 |
Total | $ | 25.3 |  |  | $ | (0.3 | ) |  | $ | 25.0 |  |  | $ | — |  |  | $ | 25.0 |
| As of December 31, 2014
Description | Gross Non-Current Assets |  | Gross Amounts Offset |  | Net Non-Current Assets Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | 22.3 |  |  | $ | — |  |  | $ | 22.3 |  |  | $ | — |  |  | $ | 22.3 |
Total | $ | 22.3 |  |  | $ | — |  |  | $ | 22.3 |  |  | $ | — |  |  | $ | 22.3 |
Schedule of offsetting liabilities |
| As of June 30, 2015
Description | Gross Current Liabilities |  | Gross Amounts Offset |  | Net Current Liabilities Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | 7.8 |  |  | $ | (4.5 | ) |  | $ | 3.3 |  |  | $ | — |  |  | $ | 3.3 |
Other Derivative Activity | 1.5 |  |  | — |  |  | 1.5 |  |  | (1.5 | ) |  | — |
Total | $ | 9.3 |  |  | $ | (4.5 | ) |  | $ | 4.8 |  |  | $ | (1.5 | ) |  | $ | 3.3 |

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