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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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- Definition

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- Definition

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