Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Measurements [Abstract]

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

The fair value hierarchy for our financial assets and liabilities accounted for at fair value on a recurring basis at December 31, 2015, was (in millions):

	As of December 31, 2015
	Level 1		Level 2			Level 3		Total
Assets
OTC commodity swaps	$	—	$	295.2		$	—	$	295.2
RINs Obligation surplus	—		12.9			—		12.9
Total assets	—		308.1			—		308.1
Liabilities
OTC commodity swaps	—		(347.5		)	—		(347.5		)
RINs Obligation deficit	—		(22.0		)	—		(22.0		)
Total liabilities	—		(369.5		)	—		(369.5		)
Net liabilities	$	—	$	(61.4	)	$	—	$	(61.4	)

	As of December 31, 2014
	Level 1		Level 2			Level 3		Total
Assets
OTC commodity swaps	$	—	$	389.6		$	—	$	389.6
RINs Obligation surplus	—		14.1			—		14.1
Total assets	—		403.7			—		403.7
Liabilities
Interest rate derivatives	—		(0.9		)	—		(0.9		)
OTC commodity swaps	—		(353.3		)	—		(353.3		)
RINs Obligation deficit	—		(14.4		)	—		(14.4		)
Total liabilities	—		(368.6		)	—		(368.6		)
Net assets	$	—	$	35.1		$	—	$	35.1