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Derivative Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 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 March 31,
| 2015 |  | 2014
| (in millions)
Current period settlements on derivative contracts | $ | (6.3 | ) |  | $ | 21.1 |
Gain (loss) on derivatives, net | (51.4 | ) |  | 109.4 |
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 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 |
The offsetting assets and liabilities for the Refining Partnership's derivatives as of March 31, 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 March 31, 2015
Description | Gross Current Assets |  | Gross Amounts Offset |  | Net Current Assets Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | 7.8 |  |  | $ | (0.5 | ) |  | $ | 7.3 |  |  | $ | — |  |  | $ | 7.3 |
Total | $ | 7.8 |  |  | $ | (0.5 | ) |  | $ | 7.3 |  |  | $ | — |  |  | $ | 7.3 |
| As of March 31, 2015
Description | Gross Non-Current Assets |  | Gross Amounts Offset |  | Net Non-Current Assets Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | 14.6 |  |  | $ | (0.1 | ) |  | $ | 14.5 |  |  | $ | — |  |  | $ | 14.5 |
Total | $ | 14.6 |  |  | $ | (0.1 | ) |  | $ | 14.5 |  |  | $ | — |  |  | $ | 14.5 |
Schedule of offsetting liabilities |
| As of March 31, 2015
Description | Gross Current Liabilities |  | Gross Amounts Offset |  | Net Current Liabilities Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | 32.9 |  |  | $ | (13.4 | ) |  | $ | 19.5 |  |  | $ | — |  |  | $ | 19.5 |
Other Derivative Activity | 0.1 |  |  | — |  |  | 0.1 |  |  | (0.1 | ) |  | — |
Total | $ | 33.0 |  |  | $ | (13.4 | ) |  | $ | 19.6 |  |  | $ | (0.1 | ) |  | $ | 19.5 |

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