Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2022

Share-Based Payment Arrangement [Abstract]

Information on stock options issued

The following table presents activity related to our stock options for the year ended December 31, 2022:

	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, 2022	3,357,374	$23.69
Granted	398,945	$50.43
Exercised	(440,170)	$15.64
Forfeited	(45,386)	$34.09
Outstanding as of December 31, 2022	3,270,763	$27.89	6.2	$	26.6
Exercisable as of December 31, 2022	1,971,559	$21.37	5.3	$	19.8

The following table presents information related to the fair value and intrinsic value of our stock options for the years ended December 31, 2022, 2021 and 2020:

	For the year ended December 31,
(in millions)	2022	2021	2020
Weighted-average grant-date fair value of options (1)	$30.09	$57.70	$8.62
Aggregate intrinsic value of stock options exercised	8.6	53.1	128.9
Fair value of stock options vested	21.3	6.2	9.6

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

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, 2022, 2021 and 2020:

	For the year ended December 31,
	2022		2021		2020
Risk-free interest rate	1.40	%	0.46	%	1.55	%
Expected volatility	71.00	%	75.33	%	33.78	%
Dividend yield (1)	—		—		—
Weighted-average expected life (in years)	5.2		5.2		5.0

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

Information on restricted stock awards

The following table presents activity related to our restricted stock for the year ended December 31, 2022:

	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, 2022	1,168,364	$58.89	1,103,013	$66.90
Granted	428,551	$43.23	704,317	$36.01
Vested	(165,101)	$56.20	(328,703)	$59.42
Forfeited	(5,606)	$67.23	(136,227)	$61.87
Nonvested as of December 31, 2022	1,426,208	$54.68	1,342,400	$53.00