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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-based compensation expense
The following table summarizes our stock-based compensation expense for the three months and six months ended June 30, 2015 and 2014.
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
(in millions)
 
2015
 
2014
 
2015
 
2014
Restricted stock units (“RSUs”) and performance-based RSUs (“PRSUs”)
 
$
4.4

 
$
2.7

 
$
7.9

 
$
4.3

Stock options
 
—

 
0.2

 
0.1

 
0.4

Stock-based compensation expense, before income taxes
 
4.4

 
2.9

 
8.0

 
4.7

Tax benefit
 
(0.4
)
 
(1.3
)
 
(0.7
)
 
(2.1
)
Stock-based compensation expense, net of tax
 
$
4.0

 
$
1.6

 
$
7.3

 
$
2.6
Activity of RSUs and PRSUs Issued to Our Employees
The following table summarizes activity for the six months ended June 30, 2015, of RSUs and PRSUs issued to our employees.
 
 
Activity
 
Weighted Average Per Share Grant Date Fair Market Value
Non-vested as of December 31, 2014
 
1,278,602

 
$
21.92

Granted:
 
 
 
 
RSUs
 
419,609

 
29.64

PRSUs
 
226,197

 
29.83

Vested:
 
 
 
 
RSUs
 
(458,074
)
 
21.15

PRSUs
 
(65,669
)
 
28.89

Forfeitures:
 
 
 
 
RSUs
 
(19,219
)
 
25.07

PRSUs
 
(25,751
)
 
26.42

Non-vested as of June 30, 2015
 
1,355,695

 
26.41
Activity of Stock Options Issued to Our Employees
The following table summarizes activity for the six months ended June 30, 2015, of stock options issued to our employees.
 
 
Activity
 
Weighted Average Exercise Price
Outstanding as of December 31, 2014
 
450,890

 
$
15.29

Exercised
 
(141,600
)
 
14.67

Forfeited or expired
 
(14,393
)
 
12.73

Outstanding as of June 30, 2015
 
294,897

 
15.72

 
 
 
 
 
Exercisable as of June 30, 2015
 
182,661

 
10.84