Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Schedule of the Fair Value of Assets and Liabilities

The fair value hierarchy for our financial assets and liabilities accounted for at fair value on a recurring basis at June 30, 2018 and December 31, 2017, was as follows (in millions):

	As of June 30, 2018
	Level 1		Level 2			Level 3		Total
Assets
Commodity derivatives	$	—	$	474.4		$	—	$	474.4
Commodity investments	18.1		—			—		18.1
RIN commitment contracts	—		8.0			—		8.0
RINs Obligation surplus	—		4.1			—		4.1
Total assets	18.1		486.5			—		504.6
Liabilities
Commodity derivatives	—		(570.9		)	—		(570.9		)
RIN commitment contracts	—		(12.0		)	—		(12.0		)
RINs Obligation deficit	—		(6.4		)	—		(6.4		)
J. Aron step-out liability	—		(471.2		)	—		(471.2		)
Total liabilities	—		(1,060.5		)	—		(1,060.5		)
Net liabilities	$	18.1	$	(574.0	)	$	—	$	(555.9	)

	As of December 31, 2017
	Level 1		Level 2			Level 3		Total
Assets
Commodity derivatives	$	—	$	178.0		$	—	$	178.0
RIN commitment contracts	—		1.4			—		1.4
RINs Obligation surplus	—		1.1			—		1.1
Total assets	—		180.5			—		180.5
Liabilities
Interest rate derivatives	—		(0.9		)	—		(0.9		)
Commodity derivatives	—		(203.9		)	—		(203.9		)
RIN commitment contracts	—		(24.0		)	—		(24.0		)
RINs Obligation deficit	—		(130.8		)	—		(130.8		)
J. Aron step-out liability	—		(435.6		)	—		(435.6		)
Total liabilities	—		(795.2		)	—		(795.2		)
Net liabilities	$	—	$	(614.7	)	$	—	$	(614.7	)