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Fair Value Measurements - Schedule of Assets and Liabilities (Details) - Recurring - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Fair value measurements    
Cash equivalents $ 15.7 $ 15.7
Other current assets (investments) 4.6 0.1
Total Assets 42.4 60.5
Total Liabilities (0.6) (2.9)
Other derivative agreements    
Fair value measurements    
Other current assets (other derivative agreements) 22.1 44.7
Other current liabilities (0.1) (0.1)
Interest rate swaps    
Fair value measurements    
Other current liabilities   (0.1)
Biofuels blending obligation    
Fair value measurements    
Other current liabilities (biofuel blending obligations) (0.5) (2.7)
Level 1    
Fair value measurements    
Cash equivalents 15.7 15.7
Other current assets (investments) 4.6 0.1
Total Assets 20.3 15.8
Total Liabilities 0.0 0.0
Level 1 | Other derivative agreements    
Fair value measurements    
Other current assets (other 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 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 0.0
Total Assets 22.1 44.7
Total Liabilities (0.6) (2.9)
Level 2 | Other derivative agreements    
Fair value measurements    
Other current assets (other derivative agreements) 22.1 44.7
Other current liabilities (0.1) (0.1)
Level 2 | Interest rate swaps    
Fair value measurements    
Other current liabilities   (0.1)
Level 2 | Biofuels blending obligation    
Fair value measurements    
Other current liabilities (biofuel blending obligations) (0.5) (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 (other 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 obligation    
Fair value measurements    
Other current liabilities (biofuel blending obligations) $ 0.0 $ 0.0