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Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - Recurring - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Fair value measurements    
Cash equivalents $ 15.8 $ 15.8
Other current assets (investments) 0.1 0.1
Total Assets 16.0 15.9
Total Liabilities (144.2) (198.1)
Other derivative agreements    
Fair value measurements    
Other current assets (other derivative agreements) 0.1  
Other current liabilities (other derivative agreements) (17.2) (11.1)
Biofuels blending obligation    
Fair value measurements    
Other liabilities (biofuel blending obligation) (127.0)  
Biofuel blending obligation and benzene obligation    
Fair value measurements    
Other liabilities (biofuel blending obligation)   (187.0)
Level 1    
Fair value measurements    
Cash equivalents 15.8 15.8
Other current assets (investments) 0.1 0.1
Total Assets 15.9 15.9
Total Liabilities 0.0 0.0
Level 1 | Other derivative agreements    
Fair value measurements    
Other current assets (other derivative agreements) 0.0  
Other current liabilities (other derivative agreements) 0.0 0.0
Level 1 | Biofuels blending obligation    
Fair value measurements    
Other liabilities (biofuel blending obligation) 0.0  
Level 1 | Biofuel blending obligation and benzene obligation    
Fair value measurements    
Other liabilities (biofuel blending obligation)   0.0
Level 2    
Fair value measurements    
Cash equivalents 0.0 0.0
Other current assets (investments) 0.0 0.0
Total Assets 0.1 0.0
Total Liabilities (144.2) (198.1)
Level 2 | Other derivative agreements    
Fair value measurements    
Other current assets (other derivative agreements) 0.1  
Other current liabilities (other derivative agreements) (17.2) (11.1)
Level 2 | Biofuels blending obligation    
Fair value measurements    
Other liabilities (biofuel blending obligation) (127.0) (186.3)
Level 2 | Biofuel blending obligation and benzene obligation    
Fair value measurements    
Other liabilities (biofuel blending obligation)   (187.0)
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 derivative agreements    
Fair value measurements    
Other current assets (other derivative agreements) 0.0  
Other current liabilities (other derivative agreements) 0.0 0.0
Level 3 | Biofuels blending obligation    
Fair value measurements    
Other liabilities (biofuel blending obligation) $ 0.0  
Level 3 | Biofuel blending obligation and benzene obligation    
Fair value measurements    
Other liabilities (biofuel blending obligation)   $ 0.0