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Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Fair value measurements |  |
Aggregate cost basis | $ 76.2 |
Recurring | Level 1 |  |
Fair value measurements |  |
Cash equivalents | 81.0 | 81.0
Other current assets (investments) | 76.2 |
Total Assets | 157.2 | 81.0
Total Liabilities | 0 | 0
Recurring | Level 1 | Other derivative agreement |  |
Fair value measurements |  |
Other current assets (other derivative agreements) | 0 | 0
Other long-term assets (other derivative agreements) | 0 | 0
Other current liabilities |  | 0
Other long-term liabilities |  | 0
Recurring | Level 1 | Interest rate swap |  |
Fair value measurements |  |
Other current liabilities | 0 | 0
Other long-term liabilities | 0 | 0
Recurring | Level 1 | Biofuels blending obligation |  |
Fair value measurements |  |
Other current liabilities (biofuel blending obligations) | 0 | 0
Recurring | Level 2 |  |
Fair value measurements |  |
Cash equivalents | 0 | 0
Other current assets (investments) | 2.9 |
Total Assets | 77.2 | 1.0
Total Liabilities | (31.8) | (35.2)
Recurring | Level 2 | Other derivative agreement |  |
Fair value measurements |  |
Other current assets (other derivative agreements) | 69.2 | 0.9
Other long-term assets (other derivative agreements) | 5.1 | 0.1
Other current liabilities |  | (15.3)
Other long-term liabilities |  | (1.8)
Recurring | Level 2 | Interest rate swap |  |
Fair value measurements |  |
Other current liabilities | (0.9) | (0.9)
Other long-term liabilities | (0.6) | (1.0)
Recurring | Level 2 | Biofuels blending obligation |  |
Fair value measurements |  |
Other current liabilities (biofuel blending obligations) | (30.3) | (16.2)
Recurring | Level 3 |  |
Fair value measurements |  |
Cash equivalents | 0 | 0
Other current assets (investments) | 0 |
Total Assets | 0 | 0
Total Liabilities | 0 | 0
Recurring | Level 3 | Other derivative agreement |  |
Fair value measurements |  |
Other current assets (other derivative agreements) | 0 | 0
Other long-term assets (other derivative agreements) | 0 | 0
Other current liabilities |  | 0
Other long-term liabilities |  | 0
Recurring | Level 3 | Interest rate swap |  |
Fair value measurements |  |
Other current liabilities | 0 | 0
Other long-term liabilities | 0 | 0
Recurring | Level 3 | Biofuels blending obligation |  |
Fair value measurements |  |
Other current liabilities (biofuel blending obligations) | 0 | 0
Recurring | Total |  |
Fair value measurements |  |
Cash equivalents | 81.0 | 81.0
Other current assets (investments) | 79.1 |
Total Assets | 234.4 | 82.0
Total Liabilities | (31.8) | (35.2)
Recurring | Total | Other derivative agreement |  |
Fair value measurements |  |
Other current assets (other derivative agreements) | 69.2 | 0.9
Other long-term assets (other derivative agreements) | 5.1 | 0.1
Other current liabilities |  | (15.3)
Other long-term liabilities |  | (1.8)
Recurring | Total | Interest rate swap |  |
Fair value measurements |  |
Other current liabilities | (0.9) | (0.9)
Other long-term liabilities | (0.6) | (1.0)
Recurring | Total | Biofuels blending obligation |  |
Fair value measurements |  |
Other current liabilities (biofuel blending obligations) | $ (30.3) | $ (16.2)

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