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Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - Recurring - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Fair value measurements    
Cash equivalents $ 15.2 $ 15.8
Other current assets (investments) 0.1 0.1
Total Assets 15.3 15.9
Total Liabilities (65.3) (198.1)
Other derivative agreements    
Fair value measurements    
Other current liabilities (derivative agreements) (64.3) (11.1)
Biofuels blending obligation    
Fair value measurements    
Other current liabilities (biofuel blending obligation & benzene obligation) (1.0)  
Biofuels blending obligations and benzene obligations    
Fair value measurements    
Other current liabilities (biofuel blending obligation & benzene obligation)   (187.0)
Level 1    
Fair value measurements    
Cash equivalents 15.2 15.8
Other current assets (investments) 0.1 0.1
Total Assets 15.3 15.9
Total Liabilities 0.0 0.0
Level 1 | Other derivative agreements    
Fair value measurements    
Other current liabilities (derivative agreements) 0.0 0.0
Level 1 | Biofuels blending obligation    
Fair value measurements    
Other current liabilities (biofuel blending obligation & benzene obligation) 0.0  
Level 1 | Biofuels blending obligations and benzene obligations    
Fair value measurements    
Other current liabilities (biofuel blending obligation & benzene obligation)   0.0
Level 2    
Fair value measurements    
Cash equivalents 0.0 0.0
Other current assets (investments) 0.0 0.0
Total Assets 0.0 0.0
Total Liabilities (65.3) (198.1)
Level 2 | Other derivative agreements    
Fair value measurements    
Other current liabilities (derivative agreements) (64.3) (11.1)
Level 2 | Biofuels blending obligation    
Fair value measurements    
Other current liabilities (biofuel blending obligation & benzene obligation) (1.0)  
Level 2 | Biofuels blending obligations and benzene obligations    
Fair value measurements    
Other current liabilities (biofuel blending obligation & benzene 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 liabilities (derivative agreements) 0.0 0.0
Level 3 | Biofuels blending obligation    
Fair value measurements    
Other current liabilities (biofuel blending obligation & benzene obligation) $ 0.0  
Level 3 | Biofuels blending obligations and benzene obligations    
Fair value measurements    
Other current liabilities (biofuel blending obligation & benzene obligation)   $ 0.0