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Stock-Based Compensation (Tables) | 12 Months Ended
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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

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