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Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Abstract]

Summary of Stock Option Activity

A summary of stock option activity under the 2012 Plan and the 2021 Plan, including 1,061,250 stock options that were granted outside of the 2012 Plan in 2019, is presented below (in millions, except share and per share amounts):

		Number of Shares				Weighted Average Exercise Price				Weighted Average Remaining Contract Term (in years)				Aggregate Intrinsic Value
Balances as of December 31, 2020			62,827,150			$	4.55				7.8			$	1,208.0
Granted			1,888,660				11.04
Exercised			(4,710,490	)			3.05
Forfeited			(401,930	)			6.35
Balances as of March 31, 2021			59,603,390			$	4.86				7.7			$	780.0
Exercisable and vested at March 31, 2021			32,491,554			$	3.47				6.6			$	470.6

Summary of Restricted Stock Units Activity

A summary of RSU activity under the 2012 Plan and the 2021 Plan is presented below:

		Number of Shares				Weighted Average Grant Date Fair Value
Balances as of December 31, 2020			32,556,160			$	6.75
Granted			18,088,710				12.61
Vested and converted to common stock			—				—
Forfeited			(371,945	)			11.80
Balances as of March 31, 2021			50,272,925			$	8.82

Summary of Share-based Payment Arrangement, Expensed and Capitalized, Amount

Total stock-based compensation expense included in the condensed consolidated statements of operations is as follows (in millions):

		Three Months Ended March 31, 2021												Three Months Ended
		IPO Related Expense				Other Expense				Total				March 31, 2020
Commissions and other related expense		$	41.7			$	2.9			$	44.6			$	4.1
Sales and marketing			1.8				7.2				9.0				2.9
Operations and support			3.1				1.9				5.0				0.8
Research and development			46.9				2.6				49.5				0.5
General and administrative			55.0				4.4				59.4				2.8
Total stock-based compensation expense		$	148.5			$	19.0			$	167.5			$	11.1

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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-Name Accounting Standards Codification
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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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