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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit)
Income taxes included on the consolidated financial statements were as follows for the periods presented (in millions):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
Current income tax provision (benefit)
$
(0.3
)
 
$
(1.0
)
 
$
0.9

 
$
(0.2
)
Deferred income tax provision
6.6

 
4.2

 
$
12.4

 
$
6.4

Total income tax provision
$
6.3

 
$
3.2

 
$
13.3

 
$
6.2
Reconciliation of Total Income Tax Expense to Income before Income Taxes
The following schedule reconciles total income tax expense and the amount calculated by applying the statutory U.S. federal tax rate to income before income taxes (in millions):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
Expected income tax provision based on federal statutory rate (1)
$
7.2

 
$
3.1

 
$
11.3

 
$
3.5

State income taxes expense, net of federal tax benefit
0.8

 
0.3

 
1.3

 
0.3

Income tax expense (benefit) from ENLK
(2.0
)
 
(0.3
)
 
(1.0
)
 
0.2

Unit-based compensation
(0.1
)
 
—

 
1.5

 
2.3

Other
0.4

 
0.1

 
0.2

 
(0.1
)
Total income tax provision
$
6.3

 
$
3.2

 
$
13.3

 
$
6.2

                                                          
(1)
The statutory federal tax rate for corporations was 21% at June 30, 2018 and 35% at June 30, 2017.