Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Reconciliation of Undiscounted Amount to Recorded Balance

The table below summarizes our environmental liability accruals (in millions):

	December 31,
	2018		2017
Discounted environmental liabilities	$	58.7	$	33.7
Undiscounted environmental liabilities	84.6		42.4
Total accrued environmental liabilities	$	143.3	$	76.1

As of December 31, 2018, the estimated future payments of environmental obligations for which discounts have been applied are as follows (in millions):

2019	$	2.9
2020	3.1
2021	3.2
2022	3.7
2023	2.8
Thereafter	61.7
Discounted environmental liabilities, gross	77.4
Less: Discount applied	18.7
Discounted environmental liabilities	$	58.7

Schedule of Asset Retirement Obligations

The reconciliation of the beginning and ending carrying amounts of asset retirement obligations is as follows (in millions):

	December 31,
	2018			2017
Beginning balance	$	72.1		$	5.2
Liabilities identified (1)	(1.2		)	66.2
Liabilities settled	(2.2		)	—
Accretion expense	1.9			0.7
Reclassification from discontinued operations	4.9			—
Ending balance	$	75.5		$	72.1

⁽¹⁾ All asset retirement obligations were assumed in the Delek/Alon Merger.

Schedule of Future Minimum Rental Payments for Operating Leases

The following is an estimate of our future minimum lease payments for operating leases having remaining noncancelable terms in excess of one year as of December 31, 2018 (in millions):

2019	$	48.1
2020	42.1
2021	39.5
2022	28.5
2023	23.4
Thereafter	77.9
Total future minimum rentals	$	259.5