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Fair Value Measurements (Details) (Recurring, USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Level 1
    
Fair value measurements    
Cash equivalents $ 81.0 $ 134.0
Total Assets 81.0 134.0
Total Liabilities 0 0
Level 1 | Other derivative agreements
    
Fair value measurements    
Other current assets 0  
Other long-term assets 0 0
Other current liabilities 0 0
Other long-term liabilities 0  
Level 1 | Interest rate swap
    
Fair value measurements    
Other current liabilities 0 0
Other long-term liabilities 0 0
Level 1 | Biofuels blending obligation
    
Fair value measurements    
Other current liabilities (biofuel blending obligation) 0 0
Level 2
    
Fair value measurements    
Cash equivalents 0 0
Total Assets 1.0 0.9
Total Liabilities (35.2) (71.6)
Level 2 | Other derivative agreements
    
Fair value measurements    
Other current assets 0.9  
Other long-term assets 0.1 0.9
Other current liabilities (15.3) (67.7)
Other long-term liabilities (1.8)  
Level 2 | Interest rate swap
    
Fair value measurements    
Other current liabilities (0.9) (0.9)
Other long-term liabilities (1.0) (1.9)
Level 2 | Biofuels blending obligation
    
Fair value measurements    
Other current liabilities (biofuel blending obligation) (16.2) (1.1)
Level 3
    
Fair value measurements    
Cash equivalents 0 0
Total Assets 0 0
Total Liabilities 0 0
Level 3 | Other derivative agreements
    
Fair value measurements    
Other current assets 0  
Other long-term assets 0 0
Other current liabilities 0 0
Other long-term liabilities 0  
Level 3 | Interest rate swap
    
Fair value measurements    
Other current liabilities 0 0
Other long-term liabilities 0 0
Level 3 | Biofuels blending obligation
    
Fair value measurements    
Other current liabilities (biofuel blending obligation) 0 0
Total
    
Fair value measurements    
Cash equivalents 81.0 134.0
Total Assets 82.0 134.9
Total Liabilities (35.2) (71.6)
Total | Other derivative agreements
    
Fair value measurements    
Other current assets 0.9  
Other long-term assets 0.1 0.9
Other current liabilities (15.3) (67.7)
Other long-term liabilities (1.8)  
Total | Interest rate swap
    
Fair value measurements    
Other current liabilities (0.9) (0.9)
Other long-term liabilities (1.0) (1.9)
Total | Biofuels blending obligation
    
Fair value measurements    
Other current liabilities (biofuel blending obligation) $ (16.2) $ (1.1)