Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2022

Share-based Payment Arrangement [Abstract]

Fair Values of Options, Black-Scholes Option-Pricing Model, Weighted-Average Assumptions

The fair values of the options granted for the three months ended March 31, 2022 were estimated on the dates of grants using the Black-Scholes option-pricing model with the following weighted-average assumptions:

Risk-free interest rate	1.92	%
Expected volatility	48.89	%
Expected life (in years)	5.14
Dividend yield	—

Stock Options Outstanding and Activity During the Period

The following table summarizes all stock option activity for the three months ended March 31, 2022 (in millions, except per share amounts and time periods):

	Options Outstanding			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value1
Balance as of December 31, 2021		1.6		$	35.25		5.8	$	36.2
Granted		0.2			58.98
Exercised		(0.2	)		37.99
Canceled/Forfeited		(0.0	)		49.40
Balance as of March 31, 2022		1.6		$	37.71		6.3	$	35.0
Vested and expected to vest after March 31, 2022		1.6		$	37.43		6.2	$	34.6
Exercisable as of March 31, 2022		1.1		$	35.00		5.1	$	26.7

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1.Aggregate intrinsic value represents the difference between the closing fair value of the underlying common stock and the exercise price of outstanding, in-the-money options on the date of measurement.

Stock Option Grants, Vesting, and Exercises

The following table summarizes additional information on stock options (in millions, except per share amounts):

	Three Months Ended March 31,
	2022		2021
Weighted-average fair value per share of stock options granted	$	26.49	$	—
Total grant date fair value of stock options vested	$	0.1	$	1.3
Total intrinsic value of stock options exercised	$	4.2	$	6.5

Restricted Shares and Units Outstanding and Activity During the Period

The following table summarizes all RSU activity for the three months ended March 31, 2022 (in millions, except grant date fair value amounts):

	RSUs Outstanding			Weighted-Average Grant Date Fair Value
Balance as of December 31, 2021		0.7		$	35.99
Granted		0.7			50.99
Released		(0.0	)		43.63
Canceled/Forfeited		(0.0	)		35.54
Balance as of March 31, 2022		1.4		$	43.33
Vested and expected to vest after March 31, 20221		1.5		$	42.19

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1.As of March 31, 2022, outstanding awards with performance conditions were expected to vest at greater than 100% of their original grant amount.

Schedule Of Restricted Stock Units Additional Information

The following table summarizes additional information regarding RSUs (in millions, except per share amounts):

	Three Months Ended March 31,
	2022		2021
Weighted-average fair value per share of RSUs granted	$	50.99	$	47.44
Total grant date fair value of RSUs vested	$	1.6	$	5.0
Total intrinsic value of RSUs released	$	0.8	$	4.9