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Fair Value Measurements (Details 1) - Recurring - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Fair value measurements    
Cash equivalents $ 15.8 $ 15.7
Other current assets (investments) 0.1 0.1
Total Assets 15.9 60.5
Total Liabilities (198.1) (2.9)
Other derivative agreements    
Fair value measurements    
Other current assets (derivative agreements) 0.0 44.7
Other current liabilities (11.1) (0.1)
Interest rate swaps    
Fair value measurements    
Other current liabilities   (0.1)
Biofuels blending obligations    
Fair value measurements    
Other current liabilities (biofuel blending obligation & benzene obligation) (187.0) (2.7)
Level 1    
Fair value measurements    
Cash equivalents 15.8 15.7
Other current assets (investments) 0.1 0.1
Total Assets 15.9 15.8
Total Liabilities 0.0 0.0
Level 1 | Other derivative agreements    
Fair value measurements    
Other current assets (derivative agreements) 0.0 0.0
Other current liabilities 0.0 0.0
Level 1 | Interest rate swaps    
Fair value measurements    
Other current liabilities   0.0
Level 1 | Biofuels blending obligations    
Fair value measurements    
Other current liabilities (biofuel blending obligation & benzene obligation) 0.0 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 44.7
Total Liabilities (198.1) (2.9)
Level 2 | Other derivative agreements    
Fair value measurements    
Other current assets (derivative agreements) 0.0 44.7
Other current liabilities (11.1) (0.1)
Level 2 | Interest rate swaps    
Fair value measurements    
Other current liabilities   (0.1)
Level 2 | Biofuels blending obligations    
Fair value measurements    
Other current liabilities (biofuel blending obligation & benzene obligation) (187.0) (2.7)
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 (derivative agreements) 0.0 0.0
Other current liabilities 0.0 0.0
Level 3 | Interest rate swaps    
Fair value measurements    
Other current liabilities   0.0
Level 3 | Biofuels blending obligations    
Fair value measurements    
Other current liabilities (biofuel blending obligation & benzene obligation) $ 0.0 $ 0.0