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Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Stock Option Activity Under Equity-Based Plans

The following table summarizes stock option activity under our 2009 Plan for the nine months ended September 30, 2018:

	Number of Shares
Balance at December 31, 2017	1,296,863
Exercised	(540,292	)
Forfeited	(17,846	)
Balance at September 30, 2018	738,725
Exercisable at September 30, 2018	710,467

Restricted Stock Unit and Restricted Stock Award Activity Under Equity-Based Plans

The following tables summarize RSU, performance-based restricted stock unit (PSU), RSA, and PRSA activity under our 2009 Plan for the nine months ended September 30, 2018:

	RSUs					PSUs
	Number of Units		Weighted-Average Grant Date Fair Value			Number of Units		Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2017	2,249,661		$	24.83		453,674		$	30.72
Granted	608,582		47.66			23,842		47.61
Vested	(800,560	)	25.79			(82,066	)	33.51
Forfeited	(254,459	)	27.25			(65,557	)	31.60
Nonvested at September 30, 2018	1,803,224		$	31.77		329,893		$	31.08

	RSAs					PRSAs
	Number of Units		Weighted-Average Grant Date Fair Value			Number of Units		Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2017	—		$	—		—		$	—
Granted	116,559		49.12			256,224		48.98
Vested	(9,122	)	47.61			—		—
Nonvested at September 30, 2018	107,437		$	49.25		256,224		$	48.98

Performance Stock Unit and Performance Stock Award Activity Under Equity-Based Plans

The following tables summarize RSU, performance-based restricted stock unit (PSU), RSA, and PRSA activity under our 2009 Plan for the nine months ended September 30, 2018:

	RSUs					PSUs
	Number of Units		Weighted-Average Grant Date Fair Value			Number of Units		Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2017	2,249,661		$	24.83		453,674		$	30.72
Granted	608,582		47.66			23,842		47.61
Vested	(800,560	)	25.79			(82,066	)	33.51
Forfeited	(254,459	)	27.25			(65,557	)	31.60
Nonvested at September 30, 2018	1,803,224		$	31.77		329,893		$	31.08

	RSAs					PRSAs
	Number of Units		Weighted-Average Grant Date Fair Value			Number of Units		Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2017	—		$	—		—		$	—
Granted	116,559		49.12			256,224		48.98
Vested	(9,122	)	47.61			—		—
Nonvested at September 30, 2018	107,437		$	49.25		256,224		$	48.98

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 September 30,							Nine Months Ended September 30,
(in millions)	2018			2017				2018			2017
Cost of providing services	$	3		$	2			$	7		$	6
Sales and marketing	2			2				6			4
General and administrative	6			3				15			8
Systems development and programming costs	1			1				3			3
Total stock-based compensation expense	$	12		$	8			$	31		$	21
Income tax benefit related to stock-based compensation expense	$	3		$	3			$	8		$	8
Tax benefit realized from stock options exercised and similar awards	$	3		$	6			$	16		$	22

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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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