Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of Information on Stock Options Issued

The following table presents activity related to our stock options for the year ended December 31, 2023:

	Number of Option Shares	Weighted-Average Exercise Price	Weighted-Average Remaining Contractual Term  (in years)	Aggregate Intrinsic Value (in millions)
Outstanding as of January 1, 2023	3,270,763	$27.89
Granted	846,291	$29.03
Exercised	(352,032)	$15.07
Forfeited	(54,838)	$40.24
Outstanding as of December 31, 2023	3,710,184	$29.19	6.4	$	13.8
Exercisable as of December 31, 2023	2,463,456	$24.67	5.5	$	13.4

The following table presents information related to the fair value and intrinsic value of our stock options for the years ended December 31, 2023, 2022, and 2021:

	For the year ended December 31,
	2023	2022	2021
Weighted-average grant-date fair value of options (1)	$18.60	$30.09	$57.70
Aggregate intrinsic value of stock options exercised (in millions)	$4.1	$8.6	$53.1
Fair value of stock options vested (in millions)	$15.9	$21.3	$6.2

(1)For the year ended December 31, 2021, the combined weighted-average grant-date fair values include options rolled over under theScore Plan.

Schedule of Weighted-Average Assumptions used in Black-Scholes Option Pricing Model

The following are the weighted-average assumptions used in the Black-Scholes option-pricing model for the years ended December 31, 2023, 2022, and 2021:

	For the year ended December 31,
	2023		2022		2021
Risk-free interest rate	3.88	%	1.40	%	0.46	%
Expected volatility	74.85	%	71.00	%	75.33	%
Dividend yield (1)	—		—		—
Weighted-average expected life (in years)	5.1		5.2		5.2

(1)The expected dividend yield is zero, as the Company has not historically paid dividends.

Schedule of Information on Restricted Stock Awards

The following table presents activity related to our restricted stock for the year ended December 31, 2023:

	With Performance Conditions		Without Performance Conditions
	Number of  Shares	Weighted- Average Grant Date Fair Value	Number of  Shares	Weighted- Average Grant Date Fair Value
Nonvested as of January 1, 2023	1,426,208	$54.68	1,342,400	$53.00
Granted	695,724	$31.49	1,039,108	$28.70
Vested	(225,935)	$48.77	(1,008,526)	$45.83
Forfeited	(84,826)	$49.24	(178,614)	$40.29
Nonvested as of December 31, 2023	1,811,171	$46.98	1,194,368	$38.03