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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2018
Income Tax Disclosure [Abstract]  
Schedule of Deferred Tax Assets and Liabilities Significant components of Delek's deferred tax assets (liabilities) reported in the accompanying consolidated financial statements as of December 31, 2018 and 2017 were as follows (in millions):
 
December 31,
 
2018
 
2017
Non-Current Deferred Taxes:
 
 
 
Property, plant and equipment, and intangibles
$
(275.6
)
 
$
(180.9
)
Partnership and equity investments
22.2

 
(83.7
)
Deferred revenues
(5.5
)
 
(6.5
)
Derivatives and hedging
(12.5
)
 
4.8

Compensation and employee benefits
15.5

 
15.9

Net operating loss carryforwards
39.9

 
26.5

Reserves and accruals
63.0

 
40.8

Inventories
1.3

 
4.4

Valuation allowance
(58.5
)
 
(21.2
)
Total net deferred tax liabilities
$
(210.2
)
 
$
(199.9
)
Schedule of Effective Income Tax Rate Reconciliation The difference between the actual income tax expense and the tax expense computed by applying the statutory federal income tax rate to income from continuing operations was attributable to the following (in millions):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Provision (benefit) for federal income taxes at statutory rate
$
102.0

 
$
104.7

 
$
(137.0
)
State income tax expense (benefit), net of federal tax provision
5.5

 
4.9

 
(10.2
)
Income tax (benefit) expense attributable to non-controlling interest
(7.3
)
 
(12.0
)
 
(7.1
)
Tax credits and incentives
(8.3
)
 
(1.6
)
 
(9.7
)
Partnership basis differences not expected to be realized
5.5

 
—

 
—

Dividends received deduction
—

 
(2.8
)
 
(5.7
)
Executive compensation limitation
1.7

 
1.5

 
0.3

Stock compensation
(2.2
)
 
—

 
—

Amortization - prepaid taxes
—

 
(2.4
)
 
(3.5
)
Reversal of deferred taxes related to equity method investment in Alon
—

 
45.3

 
—

Impact of Tax Reform Act
(0.6
)
 
(166.9
)
 
—

Goodwill write-down
5.3

 
—

 
—

Other items
0.3

 
0.1

 
1.4

Income tax expense (benefit)
$
101.9

 
$
(29.2
)
 
$
(171.5
)
Schedule of Components of Income Tax Expense (Benefit) Income tax expense (benefit) from continuing operations was as follows (in millions):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Current
$
128.7

 
$
18.8

 
$
(18.3
)
Deferred
(26.8
)
 
(48.0
)
 
(153.2
)
 
$
101.9

 
$
(29.2
)
 
$
(171.5
)
Schedule of Unrecognized Tax Benefits Roll Forward Increases and decreases to the beginning balance of unrecognized tax benefits during the years ended December 31, 2018, 2017, and 2016 were as follows:
 
2018
 
2017
 
2016
Balance at the beginning of the year
$
6.1

 
$
1.7

 
$
0.2

Additions based on tax positions related to current year
11.2

 
0.4

 
1.5

Additions for tax positions related to prior years and acquisitions
3.4

 
4.2

 
—

Reductions for tax positions related to prior years
(0.9
)
 
(0.2
)
 
—

Settlements with taxing authorities
(0.6
)
 
—

 
—

Balance at the end of the year
$
19.2

 
$
6.1

 
$
1.7