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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 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 ended March 31, 2015 and 2014.
 
 
Three Months Ended
 
 
March 31,
(in millions)
 
2015
 
2014
Restricted stock units (“RSUs”) and performance-based RSUs (“PRSUs”)
 
$
3.5

 
$
1.6

Stock options
 
0.1

 
0.2

Stock-based compensation expense, before income taxes
 
3.6

 
1.8

Tax benefit
 
(0.3
)
 
(0.8
)
Stock-based compensation expense, net of tax
 
$
3.3

 
$
1.0
Activity of RSUs and PRSUs Issued to Our Employees
The following table summarizes activity for the three months ended March 31, 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
 
388,506

 
29.83

PRSUs
 
225,694

 
29.83

Vested:
 
 
 
 
RSUs
 
(352,233
)
 
23.22

PRSUs
 
(63,642
)
 
30.47

Forfeitures:
 
 
 
 
RSUs
 
(13,509
)
 
24.94

PRSUs
 
(25,751
)
 
30.07

Non-vested as of March 31, 2015
 
1,437,667

 
25.77
Activity of Stock Options Issued to Our Employees
The following table summarizes activity for the three months ended March 31, 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 March 31, 2015
 
294,897

 
15.72

 
 
 
 
 
Exercisable as of March 31, 2015
 
182,661

 
10.84