Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2021

Stockholders Equity Note [Abstract]

Summary of Stock Option Activity

The following table summarizes the stock option activity under the Company’s plan for the quarter ended March 31, 2021:

	Weighted Average Remaining Contractual Life in Years		Options (In thousands)		Weighted- average grant date fair value		Aggregate Intrinsic Value (In millions)
Outstanding at January 1, 2021				460.7	$	32.48
Granted				124.6		59.40
Outstanding at March 31, 2021		8.6		585.3	$	38.21	$	10.5
Exercisable at March 31, 2021		8.2		172.3	$	31.81	$	4.1
Vested and expected to vest at March 31, 2021		8.8		383.5	$	40.66	$	6.1

Summary of Restricted Stock Unit Activity

The following table summarizes the Restricted Stock Unit activity under the Company’s plan for the quarter ended March 31, 2021:

	Shares (In thousands)			Weighted- average grant date fair value		Aggregate Intrinsic Value (In millions)
Unvested at January 1, 2021		515.8		$	35.11
Granted		132.1			59.40
Vested		(116.5	)		36.70
Canceled/Forfeited		(5.4	)		32.93
Unvested at March 31, 2021		526.0		$	40.87	$	29.1

Summary of Performance Share Awards Activity

The following table summarizes the Performance Share Award activity under the Company’s plan for the quarter ended March 31, 2021:

	Shares (In thousands)			Weighted- average grant date fair value		Aggregate Intrinsic Value (In millions)
Unvested at January 1, 2021		268.0		$	34.38
Granted		62.6			64.43
Vested		(28.3	)		45.80
Unvested at March 31, 2021		302.3		$	39.51	$	16.7