Equity-Based Compensation Plans (Tables)

6 Months Ended

Jun. 30, 2021

Share-based Payment Arrangement [Abstract]

Summary of Stock Award Activity

The following table summarizes stock option activity:

	Number of Shares of Class A Common Stock (#)	Weighted- Average Exercise Price Per Share ($)
Outstanding at December 31, 2020	3,428	42.79
Exercised	(646)	40.20
Forfeited	(209)	68.29
Outstanding at June 30, 2021	2,573	41.37
Vested at June 30, 2021	2,130	35.72

The following table summarizes stock award activity:

	Number of Shares of Class A Common Stock (#)
Outstanding at December 31, 2020	6,133
Granted: RSUs	3,355
Granted: TSR-based PSUs	411
Vested	(1,816)
Forfeited	(824)
Outstanding at June 30, 2021(1)	7,259

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(1)Includes financial-based PSUs for which performance targets have not yet been established, and which are not yet considered granted for accounting purposes. The balance of outstanding awards is comprised of the following:

	Number of Shares of Class A Common Stock (#)	Weighted-Average Grant-Date Fair Value Per Share ($)
RSUs	6,483	77.18
TSR-based PSUs	612	106.66
Financial-based PSUs granted for accounting purposes	83	78.62
Financial-based PSUs not yet granted for accounting purposes	81	N/A
Outstanding at June 30, 2021	7,259