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Derivative Financial Instruments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  |  | 9 Months Ended |  |  | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Apr. 13, 2011 CRNF Term loan facility | Sep. 30, 2013 Commodity derivatives | Sep. 30, 2012 Commodity derivatives | Sep. 30, 2013 Commodity derivatives | Sep. 30, 2012 Commodity derivatives | Sep. 30, 2013 Commodity swap | Sep. 30, 2012 Commodity swap | Sep. 30, 2013 Commodity swap | Sep. 30, 2012 Commodity swap | Sep. 30, 2013 Interest rate swap | Sep. 30, 2012 Interest rate swap | Sep. 30, 2013 Interest rate swap | Sep. 30, 2012 Interest rate swap | Sep. 30, 2013 Not designated as hedges Commodity swap bbl | Dec. 31, 2012 Not designated as hedges Commodity swap bbl | Sep. 30, 2013 Designated as hedges Interest rate swap agreements entered into on June 30, 2011 CRNF | Sep. 30, 2013 Designated as hedges Interest rate swap CRNF | Jul. 01, 2011 Designated as hedges Interest rate swap CRNF agreement | Sep. 30, 2013 Designated as hedges Interest rate swap agreements entered into on July 1, 2011 CRNF
Derivative Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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) |  | 0.1 | (7.1) | (2.3) | (11.0) | 72.4 | (161.8) | 175.3 | (266.4) |  |  |  |  |  |  |  |  |  |
Number of barrels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,600,000 | 23,300,000 |  |  |  |
Unrealized gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 110.1 |  |  |  |  |
Portion of net unrealized gain in current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 101.9 |  |  |  |  |
Portion of net unrealized gain in non-current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.2 |  |  |  |  |
Number of floating-to-fixed interest rate swap agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Borrowing capacity on credit facility |  |  |  |  | 125.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 125.0 |  |
Aggregate notional amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62.5 |  |
Floating rate basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | three month LIBOR |  |  | three month LIBOR
Fixed rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.94% |  |  | 1.975%
Settlement period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90 days |  |  | 90 days
Average fixed rate of interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.96% |  |
Effective rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.57% |  |
Realized loss on the interest rate swap re-classed from AOCI into interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  | (0.3) | (0.2) | (0.8) | (0.7) |  |  |  |  |  |
Change in unrealized gain (loss) on derivative agreements, net |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.3) | $ (0.4) | $ (0.1) | $ (1.3) |  |  |  |  |  |

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- Definition Net Increase or Decrease in the fair value of the derivative or group of derivatives included in earnings. + References Reference 1: 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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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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 Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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