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Fair Value Measurements (Details 1) - Recurring - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Fair value measurements    
Cash equivalents $ 15.7 $ 69.0
Other current assets (investments) 0.1 76.6
Total Assets 60.5 192.9
Total Liabilities (2.9) (50.6)
Other Contract    
Fair value measurements    
Other current assets (other derivative agreements) 44.7 25.0
Other long-term assets (other derivative agreements)   22.3
Other current liabilities (0.1)  
Interest Rate Swap    
Fair value measurements    
Other current liabilities (0.1) (0.8)
Other long-term liabilities (interest rate swaps)   (0.2)
Biofuels blending obligation    
Fair value measurements    
Other current liabilities (biofuel blending obligations) (2.7) (49.6)
Level 1    
Fair value measurements    
Cash equivalents 15.7 69.0
Other current assets (investments) 0.1 73.9
Total Assets 15.8 142.9
Total Liabilities 0.0 0.0
Level 1 | Other Contract    
Fair value measurements    
Other current assets (other derivative agreements) 0.0 0.0
Other long-term assets (other derivative agreements)   0.0
Other current liabilities 0.0  
Level 1 | Interest Rate Swap    
Fair value measurements    
Other current liabilities 0.0 0.0
Other long-term liabilities (interest rate swaps)   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 44.7 50.0
Total Liabilities (2.9) (50.6)
Level 2 | Other Contract    
Fair value measurements    
Other current assets (other derivative agreements) 44.7 25.0
Other long-term assets (other derivative agreements)   22.3
Other current liabilities (0.1)  
Level 2 | Interest Rate Swap    
Fair value measurements    
Other current liabilities (0.1) (0.8)
Other long-term liabilities (interest rate swaps)   (0.2)
Level 2 | Biofuels blending obligation    
Fair value measurements    
Other current liabilities (biofuel blending obligations) (2.7) (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 | Other Contract    
Fair value measurements    
Other current assets (other derivative agreements) 0.0 0.0
Other long-term assets (other derivative agreements)   0.0
Other current liabilities 0.0  
Level 3 | Interest Rate Swap    
Fair value measurements    
Other current liabilities 0.0 0.0
Other long-term liabilities (interest rate swaps)   0.0
Level 3 | Biofuels blending obligation    
Fair value measurements    
Other current liabilities (biofuel blending obligations) $ 0.0 $ 0.0