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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Fair value measurements    
Aggregate cost basis $ 76.2  
Recurring | Level 1
    
Fair value measurements    
Cash equivalents 81.0 81.0
Other current assets (investments) 76.2  
Total Assets 157.2 81.0
Total Liabilities 0 0
Recurring | Level 1 | Other derivative agreement
    
Fair value measurements    
Other current assets (other derivative agreements) 0 0
Other long-term assets (other derivative agreements) 0 0
Other current liabilities   0
Other long-term liabilities   0
Recurring | Level 1 | Interest rate swap
    
Fair value measurements    
Other current liabilities 0 0
Other long-term liabilities 0 0
Recurring | Level 1 | Biofuels blending obligation
    
Fair value measurements    
Other current liabilities (biofuel blending obligations) 0 0
Recurring | Level 2
    
Fair value measurements    
Cash equivalents 0 0
Other current assets (investments) 2.9  
Total Assets 77.2 1.0
Total Liabilities (31.8) (35.2)
Recurring | Level 2 | Other derivative agreement
    
Fair value measurements    
Other current assets (other derivative agreements) 69.2 0.9
Other long-term assets (other derivative agreements) 5.1 0.1
Other current liabilities   (15.3)
Other long-term liabilities   (1.8)
Recurring | Level 2 | Interest rate swap
    
Fair value measurements    
Other current liabilities (0.9) (0.9)
Other long-term liabilities (0.6) (1.0)
Recurring | Level 2 | Biofuels blending obligation
    
Fair value measurements    
Other current liabilities (biofuel blending obligations) (30.3) (16.2)
Recurring | Level 3
    
Fair value measurements    
Cash equivalents 0 0
Other current assets (investments) 0  
Total Assets 0 0
Total Liabilities 0 0
Recurring | Level 3 | Other derivative agreement
    
Fair value measurements    
Other current assets (other derivative agreements) 0 0
Other long-term assets (other derivative agreements) 0 0
Other current liabilities   0
Other long-term liabilities   0
Recurring | Level 3 | Interest rate swap
    
Fair value measurements    
Other current liabilities 0 0
Other long-term liabilities 0 0
Recurring | Level 3 | Biofuels blending obligation
    
Fair value measurements    
Other current liabilities (biofuel blending obligations) 0 0
Recurring | Total
    
Fair value measurements    
Cash equivalents 81.0 81.0
Other current assets (investments) 79.1  
Total Assets 234.4 82.0
Total Liabilities (31.8) (35.2)
Recurring | Total | Other derivative agreement
    
Fair value measurements    
Other current assets (other derivative agreements) 69.2 0.9
Other long-term assets (other derivative agreements) 5.1 0.1
Other current liabilities   (15.3)
Other long-term liabilities   (1.8)
Recurring | Total | Interest rate swap
    
Fair value measurements    
Other current liabilities (0.9) (0.9)
Other long-term liabilities (0.6) (1.0)
Recurring | Total | Biofuels blending obligation
    
Fair value measurements    
Other current liabilities (biofuel blending obligations) $ (30.3) $ (16.2)