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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2018
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
 
March 31,
 
2018
 
2017
Federal income tax (benefit) provision at the statutory rate
$
(0.4
)
21.0
 %
 
$
0.2

35.0
 %
State income taxes, net
(0.1
)
6.8

 
0.1

4.0

Excess tax deficiency (benefits) from stock-based award payments
0.3

16.7

 
(1.5
)
(172.0
)
Tax credits and other, net
(0.3
)
(16.7
)
 
—

—

Income tax benefit
$
(0.5
)
27.8
 %
 
$
(1.2
)
(133.0
)%