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Income Taxes
 6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]  
Income Taxes
(6) Income Taxes

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



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.