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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2017
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
A reconciliation of the statutory federal income tax rate to the Company’s effective income tax rate and income tax provision is as follows (in millions):
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2017
 
2016
 
2017
 
2016
Federal income tax provision at the statutory rate
$
7.7

35.0
 %
 
$
7.1

35.0
 %
 
$
11.9

35.0
 %
 
$
19.5

35.0
 %
Increase (decrease) resulting from:




 




 




 




State income taxes, net of federal benefit
0.8

3.9

 
0.7

3.4

 
1.3

3.8

 
1.9

3.3

Decrease in unrecognized tax benefits (inclusive of related interest and penalty)
(0.3
)
(1.3
)
 
(0.4
)
(1.8
)
 
(0.3
)
(0.8
)
 
(0.4
)
(0.7
)
Excess tax benefits from stock-based award payments (1)
—

—

 
—

—

 
(1.5
)
(4.5
)
 
—

—

Tax credits and other, net
(0.1
)
(0.4
)
 
(0.7
)
(3.4
)
 
(0.2
)
(0.5
)
 
(0.7
)
(1.2
)
Income tax provision
$
8.1

37.2
 %
 
$
6.7

33.2
 %
 
$
11.2

33.0
 %
 
$
20.3

36.4
 %
(1)
As the result of the adoption of ASU 2016-09, the Company recognized excess tax benefits of approximately $1.5 million, for the nine months ended September 30, 2017.