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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Restricted Stock Unit and Restricted Stock Award Activity Under Equity-Based Plans
The following table summarizes RSU and RSA activity under our equity-based plans for the three months ended March 31, 2019:
 
RSUs
RSAs
 
Number of Units
Weighted-Average
Grant Date
Fair Value
Number of Units
Weighted-Average
Grant Date
Fair Value
Nonvested at December 31, 2018
1,737,554

$
32.83

346,792

$
49.13

Granted
669,415

60.43

—

—

Vested
(297,822
)
28.83

(13,565
)
50.48

Forfeited
(14,908
)
42.79

(11,103
)
49.35

Nonvested at March 31, 2019
2,094,239

$
42.15

322,124

$
49.20
Performance Stock Unit and Performance Stock Award Activity Under Equity-Based Plans
The following table summarizes RSU and RSA activity under our equity-based plans for the three months ended March 31, 2019:
 
RSUs
RSAs
 
Number of Units
Weighted-Average
Grant Date
Fair Value
Number of Units
Weighted-Average
Grant Date
Fair Value
Nonvested at December 31, 2018
1,737,554

$
32.83

346,792

$
49.13

Granted
669,415

60.43

—

—

Vested
(297,822
)
28.83

(13,565
)
50.48

Forfeited
(14,908
)
42.79

(11,103
)
49.35

Nonvested at March 31, 2019
2,094,239

$
42.15

322,124

$
49.20
Stock-based Compensation Expense
Stock-based compensation expense and other disclosures for stock-based awards made to our employees pursuant to the equity plans was as follows: 
 
Three Months Ended March 31,
(in millions)
2019
2018
Cost of providing services
$
2

$
2

Sales and marketing
1

2

General and administrative
5

4

Systems development and programming costs
1

1

Total stock-based compensation expense
$
9

$
9

Income tax benefit related to stock-based compensation expense
$
3

$
2

Tax benefit realized from stock options exercise and similar awards
$
2

$
6