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Fair Value Measurements (Details) - Recurring - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Fair value measurements    
Cash equivalents $ 61.0 $ 69.0
Other current assets (investments) 0.3 76.6
Total Assets 84.2 192.9
Total Liabilities (19.2) (50.6)
Commodity swaps    
Fair value measurements    
Other current assets (other derivative agreements) 14.4 25.0
Other long-term assets (other derivative agreements) 8.5 22.3
Commodity Swaps and Commodity Derivatives [Member]    
Fair value measurements    
Other current liabilities (4.8)  
Interest rate swaps    
Fair value measurements    
Other current liabilities (0.6) (0.8)
Other long-term liabilities   (0.2)
Biofuels blending obligation    
Fair value measurements    
Other current liabilities (biofuel blending obligations) (13.8) (49.6)
Level 1    
Fair value measurements    
Cash equivalents 61.0 69.0
Other current assets (investments) 0.3 73.9
Total Assets 61.3 142.9
Total Liabilities 0.0 0.0
Level 1 | Commodity swaps    
Fair value measurements    
Other current assets (other derivative agreements) 0.0 0.0
Other long-term assets (other derivative agreements) 0.0 0.0
Level 1 | Commodity Swaps and Commodity Derivatives [Member]    
Fair value measurements    
Other current liabilities 0.0  
Level 1 | Interest rate swaps    
Fair value measurements    
Other current liabilities 0.0 0.0
Other long-term liabilities   0.0
Level 1 | Biofuels blending obligation    
Fair value measurements    
Other current liabilities (biofuel blending obligations) 0.0 0.0
Level 2    
Fair value measurements    
Cash equivalents 0.0 0.0
Other current assets (investments) 0.0 2.7
Total Assets 22.9 50.0
Total Liabilities (19.2) (50.6)
Level 2 | Commodity swaps    
Fair value measurements    
Other current assets (other derivative agreements) 14.4 25.0
Other long-term assets (other derivative agreements) 8.5 22.3
Level 2 | Commodity Swaps and Commodity Derivatives [Member]    
Fair value measurements    
Other current liabilities (4.8)  
Level 2 | Interest rate swaps    
Fair value measurements    
Other current liabilities (0.6) (0.8)
Other long-term liabilities   (0.2)
Level 2 | Biofuels blending obligation    
Fair value measurements    
Other current liabilities (biofuel blending obligations) (13.8) (49.6)
Level 3    
Fair value measurements    
Cash equivalents 0.0 0.0
Other current assets (investments) 0.0 0.0
Total Assets 0.0 0.0
Total Liabilities 0.0 0.0
Level 3 | Commodity swaps    
Fair value measurements    
Other current assets (other derivative agreements) 0.0 0.0
Other long-term assets (other derivative agreements) 0.0 0.0
Level 3 | Commodity Swaps and Commodity Derivatives [Member]    
Fair value measurements    
Other current liabilities 0.0  
Level 3 | Interest rate swaps    
Fair value measurements    
Other current liabilities 0.0 0.0
Other long-term liabilities   0.0
Level 3 | Biofuels blending obligation    
Fair value measurements    
Other current liabilities (biofuel blending obligations) $ 0.0 $ 0.0