Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring Basis

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

	As of December 31, 2018
	Level 1		Level 2			Level 3		Total
Assets
Commodity derivatives	$	—	$	459.8		$	—	$	459.8
Commodity investments	15.8		—			—		15.8
RIN commitment contracts	—		2.0			—		2.0
Total assets	15.8		461.8			—		477.6
Liabilities
Commodity derivatives	—		(409.0		)	—		(409.0		)
RIN commitment contracts	—		(6.7		)	—		(6.7		)
RINs obligation deficit	—		(11.8		)	—		(11.8		)
J. Aron supply and offtake obligations	—		(362.2		)	—		(362.2		)
Total liabilities	—		(789.7		)	—		(789.7		)
Net liabilities	$	15.8	$	(327.9	)	$	—	$	(312.1	)

	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
Commodity derivatives	—		(203.9		)	—		(203.9		)
Interest rate derivatives	—		(0.9		)	—		(0.9		)
RIN commitment contracts	—		(24.0		)	—		(24.0		)
RINs obligation deficit	—		(130.8		)	—		(130.8		)
J. Aron supply and offtake obligations	—		(435.6		)	—		(435.6		)
Total liabilities	—		(795.2		)	—		(795.2		)
Net liabilities	$	—	$	(614.7	)	$	—	$	(614.7	)