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INCOME TAXES (Tables)
 9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
The provision for income taxes differs from the amount of income tax determined by applying the applicable United States statutory federal income tax rate to income before income taxes as a result of the following:
 
 
Three Months Ended September 30, 2018
 
Nine Months Ended September 30, 2018
 
 
Amount (in millions)
 
Effective Tax Rate
 
Amount (in millions)
 
Effective Tax Rate
Statutory federal income tax
 
$
52.6

 
21.0
 %
 
$
212.3

 
21.0
 %
State income taxes net of federal tax benefit
 
16.0

 
6.4
 %
 
63.6

 
6.3
 %
Tax repairs
 
(35.8
)
 
(14.3
)%
 
(83.9
)
 
(8.3
)%
Federal tax reform
 
(3.2
)
 
(1.3
)%
 
(17.2
)
 
(1.7
)%
Other
 
(12.6
)
 
(5.0
)%
 
(18.4
)
 
(1.8
)%
Total income tax expense
 
$
17.0

 
6.8
 %
 
$
156.4

 
15.5
 %