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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Shares Available for Future Grants

The following table summarizes the number of shares available for future grants under our 2011 Plan:
 
 
 
As of March 31

(in millions)
 
2015

Shares available for future grants
 
4.2

Schedule of Stock-Based Compensation Expense
The following table summarizes our stock-based compensation expense and the related income tax benefit we recorded:
 
 
Three months ended March 31
(in millions)
 
2015

 
2014

Restricted stock units
 
$
4.0

 
$
3.7

Restricted stock
 
0.1

 
0.1

Performance share awards
 
0.1

 

Stock options
 
0.1

 
0.1

Total stock-based compensation expense
 
$
4.3

 
$
3.9

 
 


 


Income tax benefit related to the stock-based compensation expense
 
$
1.2

 
$
1.1

Schedule Of Compensation Cost By Expense Category
The following table summarizes the stock-based compensation expense included in each of our operating expense categories:
 
 
Three months ended March 31
(in millions)
 
2015

 
2014

Cost of revenue
 
$
2.0

 
$
1.7

Sales and marketing
 
0.5

 
0.5

General and administrative
 
1.8

 
1.7

Total stock-based compensation expense
 
$
4.3

 
$
3.9

Schedule of Unrecognized Stock-Based Compensation Expense
The following table summarizes the amount of unrecognized stock-based compensation expense as of March 31, 2015 and the expected number of months over which the expense will be recognized:
 
 
Unrecognized stock-based compensation expense (in millions)

 
Expected amortization period (months)
Restricted stock units
 
$
29.1

 
30
Restricted stock
 

 
1
Performance share awards
 
4.2

 
32
Stock options
 
0.1

 
4
Total unrecognized stock-based compensation expense
 
$
33.4

 
30
Schedule of Restricted Stock Units Award Activity

The following table summarizes restricted stock unit activity during the first three months of 2015:
Restricted Stock Units (RSUs)
 
Unvested

 
Vested but
Deferred

 
Total

 
Weighted
Average
Grant Date Value
per RSU

RSUs outstanding—December 31, 2014
 
655,934

 
14,778

 
670,712

 
$
67.51

Granted
 

 

 

 

Dividend equivalents
 
595

 
42

 
637

 
56.40

Vested
 
(123
)
 

 
(123
)
 
57.07

Issued
 

 

 

 

Forfeited
 
(10,812
)
 

 
(10,812
)
 
68.23

RSUs Outstanding - March 31, 2015
 
645,594

 
14,820

 
660,414

 
$
67.50

Schedule of Performance Share Activity
The table below shows target performance share awards granted and shares that would be issued at current performance levels for performance share awards granted as of March 31, 2015:
 
 
As of March 31, 2015

Target performance share awards granted
 
75,947

Weighted average fair value per award
 
$
76.33

Number of shares that would be issued based on current performance levels
 
64,105

Unamortized expense, based on current performance levels (in millions)
 
$
4.2

Schedule of All Other Option Granted
The following table summarizes stock option activity in the first three months of 2015 for our various stock option grants:
 
 
Underlying
Shares

 
Weighted
Average
Exercise
Price

Options outstanding—December 31, 2014
 
169,810

 
$
40.20

Granted
 

 

Canceled
 

 

Exercised
 
(81,579
)
 
29.32

Options outstanding—March 31, 2015
 
88,231

 
$
50.53

 
 
 
 
 
Options exercisable—March 31, 2015
 
73,285

 
$
49.11


 
Schedule of Intrinsic Value of Stock Options Exercised During Period
The following table summarizes the total intrinsic value of options exercised, which reflects the difference between the market value of our stock on the date of exercise and the exercise price of the option:
 
 
 
Three months ended March 31
(in millions)
 
2015

 
2014

Intrinsic value of options exercised
 
$
3.7

 
$
2.5

Schedule of Options, Vested and Expected to Vest, Outstanding and Exercisable

The table below shows additional information for options outstanding and exercisable as of March 31, 2015:
 
 
 
Options Outstanding
 
Options Exercisable
Range of Exercise Prices
 
Number of  Options

 
Weighted
Average
Remaining
Contractual
Life (years)
 
Weighted
Average
Exercise
Price

 
Aggregate
Intrinsic
Value
(in millions)

 
Exercisable Shares

 
Weighted Average Remaining Contractual Life (years)
 
Weighted Average Exercise Price

 
Aggregate Intrinsic Value (in millions)

$27.81
 
19,300

 
0.09
 
$
27.81

 
$
0.9

 
19,300

 
0.09
 
$
27.81

 
$
0.9

$40.88 - $51.58
 
5,256

 
0.67
 
49.84

 
0.1

 
5,256

 
0.67
 
49.84

 
0.1

$57.28 - $59.35
 
63,675

 
6.26
 
57.48

 
1.1

 
48,729

 
6.26
 
57.47

 
0.9

$57.28 - $59.35
 
88,231

 
4.58
 
$
50.53

 
$
2.1

 
73,285

 
4.24
 
$
49.11

 
$
1.9

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Vested or Expected to Vest
 
 
 
 
 
 
 
 
 
 
 
 
 
$27.81 - $59.35
 
88,231

 
4.58
 
$
50.53

 
$
2.1

 
 
 
 
 
 
 
 
Schedule of Tax Benefits Related to Share Based Compensation
The following table summarizes our excess tax benefits:
 
 
Three months ended March 31
(in millions)
 
2015

 
2014

Excess tax benefits related to stock-based compensation
 
$
1.1

 
$
0.6