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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Components of Stock-Based Compensation Expense
A summary of the total compensation expense and associated income tax benefits recognized under the Omnibus Plan are as follows (in millions):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
Compensation expense
$
3.0

 
$
1.7

 
$
4.5

 
$
2.7

Income tax benefit
(1.2
)
 
(0.6
)
 
(1.8
)
 
(1.0
)
Total
$
1.8

 
$
1.1

 
$
2.7

 
$
1.7