Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2023

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 periods presented were estimated on the dates of grants using the Black-Scholes option-pricing model with the following weighted-average assumptions:

	Six Months Ended June 30,
	2023		2022
Risk-free interest rate	4.26	%	1.93	%
Expected volatility	49.92	%	48.89	%
Expected life (in years)	5.12		5.14
Dividend yield	—		—

Stock Options Outstanding and Activity During the Period

The following table summarizes all stock option activity for the six months ended June 30, 2023 (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, 2022	1.3	$	38.73	6.0	$	20.7
Granted	0.1	65.00
Exercised	(0.2)	37.99
Canceled/Forfeited	(0.0)	49.68
Balance as of June 30, 2023	1.2	$	41.09	6.2	$	52.5
Vested and expected to vest after June 30, 2023	1.2	$	40.76	6.1	$	52.0
Exercisable as of June 30, 2023	0.9	$	36.19	5.3	$	43.4

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):

	Six Months Ended June 30,
	2023		2022
Weighted-average fair value per share of stock options granted	$	31.86	$	26.50
Total grant date fair value of stock options vested	$	1.9	$	0.2
Total intrinsic value of stock options exercised	$	5.9	$	7.6

Restricted Shares and Units Outstanding and Activity During the Period

The following table summarizes all RSU activity for the six months ended June 30, 2023 (in millions, except grant date fair value amounts):

	RSUs Outstanding	Weighted-Average Grant Date Fair Value
Balance as of December 31, 2022	1.2	$	45.60
Granted	0.4	$	62.98
Released	(0.1)	$	45.74
Canceled/Forfeited	(0.0)	$	53.40
Balance as of June 30, 2023	1.5	$	50.13
Vested and expected to vest after June 30, 20231	1.6	$	48.94

1.As of June 30, 2023, 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):

	Six Months Ended June 30,
	2023		2022
Weighted-average fair value per share of RSUs granted	$	62.98	$	50.94
Total grant date fair value of RSUs vested	$	4.1	$	2.1
Total intrinsic value of RSUs released	$	5.3	$	2.0