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Fair Value Measurements (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Recurring
Level 1
Dec. 31, 2012
Recurring
Level 1
Sep. 30, 2013
Recurring
Level 1
Other derivative agreements
Dec. 31, 2012
Recurring
Level 1
Other derivative agreements
Sep. 30, 2013
Recurring
Level 1
Interest rate swap
Dec. 31, 2012
Recurring
Level 1
Interest rate swap
Dec. 31, 2012
Recurring
Level 1
Biofuels blending obligation
Sep. 30, 2013
Recurring
Level 2
Dec. 31, 2012
Recurring
Level 2
Sep. 30, 2013
Recurring
Level 2
Other derivative agreements
Dec. 31, 2012
Recurring
Level 2
Other derivative agreements
Sep. 30, 2013
Recurring
Level 2
Interest rate swap
Dec. 31, 2012
Recurring
Level 2
Interest rate swap
Dec. 31, 2012
Recurring
Level 2
Biofuels blending obligation
Sep. 30, 2013
Recurring
Level 3
Dec. 31, 2012
Recurring
Level 3
Sep. 30, 2013
Recurring
Level 3
Other derivative agreements
Dec. 31, 2012
Recurring
Level 3
Other derivative agreements
Sep. 30, 2013
Recurring
Level 3
Interest rate swap
Dec. 31, 2012
Recurring
Level 3
Interest rate swap
Dec. 31, 2012
Recurring
Level 3
Biofuels blending obligation
Sep. 30, 2013
Recurring
Total
Dec. 31, 2012
Recurring
Total
Sep. 30, 2013
Recurring
Total
Other derivative agreements
Dec. 31, 2012
Recurring
Total
Other derivative agreements
Sep. 30, 2013
Recurring
Total
Interest rate swap
Dec. 31, 2012
Recurring
Total
Interest rate swap
Dec. 31, 2012
Recurring
Total
Biofuels blending obligation
Fair value measurements                                                              
Cash equivalents       $ 81,000,000 $ 134,000,000           $ 0 $ 0           $ 0 $ 0           $ 81,000,000 $ 134,000,000          
Other current assets (other derivative agreements)           0             101,900,000             0             101,900,000        
Other long-term assets (other derivative agreements)           0 0           8,200,000 900,000           0 0           8,200,000 900,000      
Total Assets       81,000,000 134,000,000           110,100,000 900,000           0 0           191,100,000 134,900,000          
Other current liabilities             0 0 0         (67,700,000) (900,000) (900,000)         0 0 0         (67,700,000) (900,000) (900,000)  
Other current liabilities                   0             (1,100,000)             0             (1,100,000)
Other long-term liabilities               0 0           (1,200,000) (1,900,000)           0 0           (1,200,000) (1,900,000)  
Total Liabilities       0 0           (2,100,000) (71,600,000)           0 0           (2,100,000) (71,600,000)          
Aggregate cost for available-for-sale securities 18,600,000 18,600,000                                                          
Proceeds from sale of available-for-sale securities 24,700,000 24,700,000 0                                                        
Reclassification of unrealized gain from accumulated other comprehensive Income upon sale of available for sale securities 6,100,000 6,100,000                                                          
Transfers of assets or liabilities between levels   $ 0