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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair value measurements    
Aggregate cost basis $ 4.3  
Recurring | Level 1
    
Fair value measurements    
Cash equivalents 81.0 81.0
Other current assets (marketable securities) 4.3  
Total Assets 85.3 81.0
Total Liabilities 0 0
Recurring | Level 1 | Other derivative agreements
    
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 (marketable securities) 0  
Total Assets 72.2 1.0
Total Liabilities (30.3) (35.2)
Recurring | Level 2 | Other derivative agreements
    
Fair value measurements    
Other current assets (other derivative agreements) 70.7 0.9
Other long-term assets (other derivative agreements) 1.5 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 (0.8) (1.0)
Recurring | Level 2 | Biofuels blending obligation
    
Fair value measurements    
Other current liabilities (biofuel blending obligations) (28.6) (16.2)
Recurring | Level 3
    
Fair value measurements    
Cash equivalents 0 0
Other current assets (marketable securities) 0  
Total Assets 0 0
Total Liabilities 0 0
Recurring | Level 3 | Other derivative agreements
    
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 (marketable securities) 4.3  
Total Assets 157.5 82.0
Total Liabilities (30.3) (35.2)
Recurring | Total | Other derivative agreements
    
Fair value measurements    
Other current assets (other derivative agreements) 70.7 0.9
Other long-term assets (other derivative agreements) 1.5 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 (0.8) (1.0)
Recurring | Total | Biofuels blending obligation
    
Fair value measurements    
Other current liabilities (biofuel blending obligations) $ (28.6) $ (16.2)