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Fair Value Measurements (Details) - Recurring - USD ($) $ in Millions | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Fair value measurements |  |
Cash equivalents | $ 61.0 | $ 69.0
Other current assets (investments) | 0.3 | 76.6
Total Assets | 84.2 | 192.9
Total Liabilities | (19.2) | (50.6)
Commodity swaps |  |
Fair value measurements |  |
Other current assets (other derivative agreements) | 14.4 | 25.0
Other long-term assets (other derivative agreements) | 8.5 | 22.3
Commodity Swaps and Commodity Derivatives [Member] |  |
Fair value measurements |  |
Other current liabilities | (4.8) |
Interest rate swaps |  |
Fair value measurements |  |
Other current liabilities | (0.6) | (0.8)
Other long-term liabilities |  | (0.2)
Biofuels blending obligation |  |
Fair value measurements |  |
Other current liabilities (biofuel blending obligations) | (13.8) | (49.6)
Level 1 |  |
Fair value measurements |  |
Cash equivalents | 61.0 | 69.0
Other current assets (investments) | 0.3 | 73.9
Total Assets | 61.3 | 142.9
Total Liabilities | 0.0 | 0.0
Level 1 | Commodity swaps |  |
Fair value measurements |  |
Other current assets (other derivative agreements) | 0.0 | 0.0
Other long-term assets (other derivative agreements) | 0.0 | 0.0
Level 1 | Commodity Swaps and Commodity Derivatives [Member] |  |
Fair value measurements |  |
Other current liabilities | 0.0 |
Level 1 | Interest rate swaps |  |
Fair value measurements |  |
Other current liabilities | 0.0 | 0.0
Other long-term 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 | 2.7
Total Assets | 22.9 | 50.0
Total Liabilities | (19.2) | (50.6)
Level 2 | Commodity swaps |  |
Fair value measurements |  |
Other current assets (other derivative agreements) | 14.4 | 25.0
Other long-term assets (other derivative agreements) | 8.5 | 22.3
Level 2 | Commodity Swaps and Commodity Derivatives [Member] |  |
Fair value measurements |  |
Other current liabilities | (4.8) |
Level 2 | Interest rate swaps |  |
Fair value measurements |  |
Other current liabilities | (0.6) | (0.8)
Other long-term liabilities |  | (0.2)
Level 2 | Biofuels blending obligation |  |
Fair value measurements |  |
Other current liabilities (biofuel blending obligations) | (13.8) | (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 | Commodity swaps |  |
Fair value measurements |  |
Other current assets (other derivative agreements) | 0.0 | 0.0
Other long-term assets (other derivative agreements) | 0.0 | 0.0
Level 3 | Commodity Swaps and Commodity Derivatives [Member] |  |
Fair value measurements |  |
Other current liabilities | 0.0 |
Level 3 | Interest rate swaps |  |
Fair value measurements |  |
Other current liabilities | 0.0 | 0.0
Other long-term liabilities |  | 0.0
Level 3 | Biofuels blending obligation |  |
Fair value measurements |  |
Other current liabilities (biofuel blending obligations) | $ 0.0 | $ 0.0

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