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Derivative Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2014
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:
| Year Ended December 31,
| 2014 |  | 2013 |  | 2012
| (in millions)
Current period settlement on derivative contracts | $ | 122.2 |  |  | $ | 6.4 |  |  | $ | (137.6 | )
Gain (loss) on derivatives, net | 185.6 |  |  | 57.1 |  |  | (285.6 | )
Schedule of offsetting assets | 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 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 |
The offsetting assets and liabilities for the Refining Partnership's derivatives as of December 31, 2013 are recorded as current assets, non-current assets, current liabilities and non-current liabilities in prepaid expenses and other current assets, other long-term assets, other current liabilities and other long-term liabilities, respectively, in the Consolidated Balance Sheets as follows:
| As of December 31, 2013
Description | Gross Current Assets |  | Gross Amounts Offset |  | Net Current Assets Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | 4.3 |  |  | $ | (3.4 | ) |  | $ | 0.9 |  |  | $ | — |  |  | $ | 0.9 |
Total | $ | 4.3 |  |  | $ | (3.4 | ) |  | $ | 0.9 |  |  | $ | — |  |  | $ | 0.9 |
| As of December 31, 2013
Description | Gross Non-Current Assets |  | Gross Amounts Offset |  | Net Non-Current Assets Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | 0.1 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | — |  |  | $ | 0.1 |
Total | $ | 0.1 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | — |  |  | $ | 0.1 |
Schedule of offsetting liabilities |
| As of December 31, 2013
Description | Gross Current Liabilities |  | Gross Amounts Offset |  | Net Current Liabilities Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | 31.4 |  |  | $ | (16.1 | ) |  | $ | 15.3 |  |  | $ | — |  |  | $ | 15.3 |
Total | $ | 31.4 |  |  | $ | (16.1 | ) |  | $ | 15.3 |  |  | $ | — |  |  | $ | 15.3 |
| As of December 31, 2013
Description | Gross Non-Current Liabilities |  | Gross Amounts Offset |  | Net Non-Current Liabilities Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | 1.9 |  |  | $ | (0.1 | ) |  | $ | 1.8 |  |  | $ | — |  |  | $ | 1.8 |
Total | $ | 1.9 |  |  | $ | (0.1 | ) |  | $ | 1.8 |  |  | $ | — |  |  | $ | 1.8 |

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