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Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2014 Recurring | Dec. 31, 2013 Recurring | Sep. 30, 2014 Recurring Other derivative agreement | Dec. 31, 2013 Recurring Other derivative agreement | Sep. 30, 2014 Recurring Interest rate swap | Dec. 31, 2013 Recurring Interest rate swap | Sep. 30, 2014 Recurring Biofuels blending obligation | Dec. 31, 2013 Recurring Biofuels blending obligation | Sep. 30, 2014 Recurring Level 1 | Dec. 31, 2013 Recurring Level 1 | Sep. 30, 2014 Recurring Level 1 Other derivative agreement | Dec. 31, 2013 Recurring Level 1 Other derivative agreement | Sep. 30, 2014 Recurring Level 1 Interest rate swap | Dec. 31, 2013 Recurring Level 1 Interest rate swap | Sep. 30, 2014 Recurring Level 1 Biofuels blending obligation | Dec. 31, 2013 Recurring Level 1 Biofuels blending obligation | Sep. 30, 2014 Recurring Level 2 | Dec. 31, 2013 Recurring Level 2 | Sep. 30, 2014 Recurring Level 2 Other derivative agreement | Dec. 31, 2013 Recurring Level 2 Other derivative agreement | Sep. 30, 2014 Recurring Level 2 Interest rate swap | Dec. 31, 2013 Recurring Level 2 Interest rate swap | Sep. 30, 2014 Recurring Level 2 Biofuels blending obligation | Dec. 31, 2013 Recurring Level 2 Biofuels blending obligation | Sep. 30, 2014 Recurring Level 3 | Dec. 31, 2013 Recurring Level 3 | Sep. 30, 2014 Recurring Level 3 Other derivative agreement | Dec. 31, 2013 Recurring Level 3 Other derivative agreement | Sep. 30, 2014 Recurring Level 3 Interest rate swap | Dec. 31, 2013 Recurring Level 3 Interest rate swap | Sep. 30, 2014 Recurring Level 3 Biofuels blending obligation | Dec. 31, 2013 Recurring Level 3 Biofuels blending obligation
Fair value measurements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  | $ 69.0 | $ 81.0 |  |  |  |  |  |  | $ 69.0 | $ 81.0 |  |  |  |  |  |  | $ 0 | $ 0 |  |  |  |  |  |  | $ 0 | $ 0 |  |  |  |  |  |
Other current assets (investments) |  |  | 93.8 |  |  |  |  |  |  |  | 89.4 |  |  |  |  |  |  |  | 4.4 |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Other current assets (other derivative agreements) |  |  |  |  | 53.2 | 0.9 |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  | 53.2 | 0.9 |  |  |  |  |  |  | 0 | 0 |  |  |  |
Other long-term assets (other derivative agreements) |  |  |  |  | 8.6 | 0.1 |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  | 8.6 | 0.1 |  |  |  |  |  |  | 0 | 0 |  |  |  |
Total Assets |  |  | 224.6 | 82.0 |  |  |  |  |  |  | 158.4 | 81.0 |  |  |  |  |  |  | 66.2 | 1.0 |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |
Other current liabilities |  |  |  |  |  | (15.3) | (0.9) | (0.9) |  |  |  |  |  | 0 | 0 | 0 |  |  |  |  |  | (15.3) | (0.9) | (0.9) |  |  |  |  |  | 0 | 0 | 0 |  |
Other current liabilities (biofuel blending obligations) |  |  |  |  |  |  |  |  | (9.9) | (16.2) |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  | (9.9) | (16.2) |  |  |  |  |  |  | 0 | 0
Other long-term liabilities |  |  |  |  |  | (1.8) | (0.3) | (1.0) |  |  |  |  |  | 0 | 0 | 0 |  |  |  |  |  | (1.8) | (0.3) | (1.0) |  |  |  |  |  | 0 | 0 | 0 |  |
Total Liabilities |  |  | (11.1) | (35.2) |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  | (11.1) | (35.2) |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |
Unrealized gain | 13.2 | 13.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cost basis | $ 76.2 | $ 76.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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