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Equity-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Summary of Stock Option Activity

Equity Plan Activity

The following table summarizes stock option activity:

						Number of Shares of Class A Common Stock (#)						Weighted- Average Grant- Date Fair Value ($)						Weighted- Average Exercise Price ($)						Weighted- Average Remaining Contractual Life (in years)						Aggregate Intrinsic Value ($)
Outstanding at December 31, 2017						13,460												18.63
Granted						1,208						22.19						61.49
Exercised						(4,779)												14.08												246.4
Forfeited						(362)												34.05
Outstanding at December 31, 2018						9,527												25.77
Granted						1,401						24.91						71.74
Exercised						(3,976)												17.78												213.8
Forfeited						(648)												54.43
Outstanding at December 31, 2019						6,304												38.08
Granted						154						22.33						68.05
Exercised						(2,613)												29.71												121.0
Forfeited						(417)												62.82
Outstanding at December 31, 2020						3,428												42.79						6.0						137.6
Vested at December 31, 2020						2,458												33.90						5.2						120.6

Summary of Stock Award Activity

The following table summarizes stock award activity:

						Number of Shares of Class A Common Stock (#)
Outstanding at December 31, 2017(1)						4,199
Granted						3,152
Vested						(1,545)
Forfeited						(450)
Outstanding at December 31, 2018(1)						5,356
Granted						3,057
Vested						(2,187)
Forfeited						(986)
Outstanding at December 31, 2019(1)						5,240
Granted						4,157
Vested						(2,368)
Forfeited						(896)
Outstanding at December 31, 2020						6,133

_________________________________

(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 Fair Value Per Share ($)
RSUs			3,952						53.77
Financial-based PSUs granted for accounting purposes			505						63.18
Financial-based PSUs not yet granted for accounting purposes			899						N/A
Outstanding at December 31, 2018			5,356
RSUs			4,247						65.12
Financial-based PSUs granted for accounting purposes			401						73.28
Financial-based PSUs not yet granted for accounting purposes			592						N/A
Outstanding at December 31, 2019			5,240
RSUs			5,356						70.54
TSR-based RSUs			349						106.14
Financial-based PSUs granted for accounting purposes			223						66.97
Financial-based PSUs not yet granted for accounting purposes			205						N/A
Outstanding at December 31, 2020			6,133

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- References

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Tabular disclosure of share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 50
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