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Derivative Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2013
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 September 30, |  | Nine Months Ended September 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
| (in millions)
Current period settlements on derivative contracts | $ | 33.9 |  |  | $ | (53.2 | ) |  | $ | (3.9 | ) |  | $ | (80.4 | )
Gain (loss) on derivatives, net | $ | 72.5 |  |  | $ | (168.9 | ) |  | $ | 173.0 |  |  | $ | (277.4 | )
Schedule of offsetting assets recorded as current assets and non-current assets in prepaid expenses and other current assets and other long-term assets in the Condensed Consolidated Balance Sheets |
| As of December 31, 2012
Description | Gross Non-Current Assets |  | Gross Amounts Offset |  | Net Non-Current Assets Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | 0.9 |  |  | $ | — |  |  | $ | 0.9 |  |  | $ | — |  |  | $ | 0.9 |
Total | $ | 0.9 |  |  | $ | — |  |  | $ | 0.9 |  |  | $ | — |  |  | $ | 0.9 |
| As of September 30, 2013
Description | Gross Current Assets |  | Gross Amounts Offset |  | Net Current Assets Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | 104.1 |  |  | $ | (2.2 | ) |  | $ | 101.9 |  |  | $ | — |  |  | $ | 101.9 |
Total | $ | 104.1 |  |  | $ | (2.2 | ) |  | $ | 101.9 |  |  | $ | — |  |  | $ | 101.9 |
| As of September 30, 2013
Description | Gross Non-Current Assets |  | Gross Amounts Offset |  | Net Non-Current Assets Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | 8.2 |  |  | $ | — |  |  | $ | 8.2 |  |  | $ | — |  |  | $ | 8.2 |
Total | $ | 8.2 |  |  | $ | — |  |  | $ | 8.2 |  |  | $ | — |  |  | $ | 8.2 |
Schedule of offsetting liabilities recorded as current liabilities in other current liabilities in the Condensed Consolidated Balance Sheet |
| As of December 31, 2012
Description | Gross Current Liabilities |  | Gross Amounts Offset |  | Net Current Liabilities Presented |  | Cash Collateral Not Offset |  | Net Amount
| (in millions)
Commodity Swaps | $ | 74.2 |  |  | $ | (6.5 | ) |  | $ | 67.7 |  |  | $ | — |  |  | $ | 67.7 |
Total | $ | 74.2 |  |  | $ | (6.5 | ) |  | $ | 67.7 |  |  | $ | — |  |  | $ | 67.7 |

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- Definition Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 + Details
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