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Commitments and Contingencies - Renewable Fuel Standards (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Recurring | Biofuels blending obligation |  |  |
Loss Contingencies [Line Items] |  |  |
Biofuel blending obligation recorded in other current liabilities | $ 1.0 |  |
Recurring | Biofuels blending obligation | Level 2 |  |  |
Loss Contingencies [Line Items] |  |  |
Biofuel blending obligation recorded in other current liabilities | $ 1.0 |  |
EHS | CRRM |  |  |
Loss Contingencies [Line Items] |  |  |
Blend wall, percentage threshold | 10.00% |  |
Cost of renewable identification numbers | $ 249.0 | $ 205.9 | $ 123.9
Biofuel blending obligation recorded in other current liabilities | $ 28.3 | $ 186.3 |

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