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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Sep. 30, 2014
Recurring
Dec. 31, 2013
Recurring
Sep. 30, 2014
Recurring
Other derivative agreement
Dec. 31, 2013
Recurring
Other derivative agreement
Sep. 30, 2014
Recurring
Interest rate swap
Dec. 31, 2013
Recurring
Interest rate swap
Sep. 30, 2014
Recurring
Biofuels blending obligation
Dec. 31, 2013
Recurring
Biofuels blending obligation
Sep. 30, 2014
Recurring
Level 1
Dec. 31, 2013
Recurring
Level 1
Sep. 30, 2014
Recurring
Level 1
Other derivative agreement
Dec. 31, 2013
Recurring
Level 1
Other derivative agreement
Sep. 30, 2014
Recurring
Level 1
Interest rate swap
Dec. 31, 2013
Recurring
Level 1
Interest rate swap
Sep. 30, 2014
Recurring
Level 1
Biofuels blending obligation
Dec. 31, 2013
Recurring
Level 1
Biofuels blending obligation
Sep. 30, 2014
Recurring
Level 2
Dec. 31, 2013
Recurring
Level 2
Sep. 30, 2014
Recurring
Level 2
Other derivative agreement
Dec. 31, 2013
Recurring
Level 2
Other derivative agreement
Sep. 30, 2014
Recurring
Level 2
Interest rate swap
Dec. 31, 2013
Recurring
Level 2
Interest rate swap
Sep. 30, 2014
Recurring
Level 2
Biofuels blending obligation
Dec. 31, 2013
Recurring
Level 2
Biofuels blending obligation
Sep. 30, 2014
Recurring
Level 3
Dec. 31, 2013
Recurring
Level 3
Sep. 30, 2014
Recurring
Level 3
Other derivative agreement
Dec. 31, 2013
Recurring
Level 3
Other derivative agreement
Sep. 30, 2014
Recurring
Level 3
Interest rate swap
Dec. 31, 2013
Recurring
Level 3
Interest rate swap
Sep. 30, 2014
Recurring
Level 3
Biofuels blending obligation
Dec. 31, 2013
Recurring
Level 3
Biofuels blending obligation
Fair value measurements                                                                    
Cash equivalents     $ 69.0 $ 81.0             $ 69.0 $ 81.0             $ 0 $ 0             $ 0 $ 0            
Other current assets (investments)     93.8               89.4               4.4               0              
Other current assets (other derivative agreements)         53.2 0.9             0 0             53.2 0.9             0 0        
Other long-term assets (other derivative agreements)         8.6 0.1             0 0             8.6 0.1             0 0        
Total Assets     224.6 82.0             158.4 81.0             66.2 1.0             0 0            
Other current liabilities           (15.3) (0.9) (0.9)           0 0 0           (15.3) (0.9) (0.9)           0 0 0    
Other current liabilities (biofuel blending obligations)                 (9.9) (16.2)             0 0             (9.9) (16.2)             0 0
Other long-term liabilities           (1.8) (0.3) (1.0)           0 0 0           (1.8) (0.3) (1.0)           0 0 0    
Total Liabilities     (11.1) (35.2)             0 0             (11.1) (35.2)             0 0            
Unrealized gain 13.2 13.2                                                                
Aggregate cost basis $ 76.2 $ 76.2