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STOCK-BASED COMPENSATION (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Feb. 28, 2023 | Mar. 31, 2023 | Mar. 31, 2022
Stock-based Compensation |  |  |
Stock-based compensation expense |  | $ 16.9 | $ 9.1
Payments for the purchase of shares to satisfy the employee income tax withholdings |  | $ 12.7 | $ 8.4
Restricted Stock Units |  |  |
Stock-based Compensation |  |  |
Number of shares of common stock of which unit is convertible (in shares) |  | 1 |
Vesting period |  | 3 years |
Qualified retirement eligibility age for grants awarded in and after 2017 |  | 55 years |
Qualified retirement eligibility number of years of service for grants awarded in and after 2017 |  | 10 years |
PSUs |  |  |
Stock-based Compensation |  |  |
Number of shares of common stock of which unit is convertible (in shares) |  | 1 |
Vesting period |  | 3 years |
Shares purchased to satisfy the employee income tax withholdings (in shares) |  | 21,459 |
Payments for the purchase of shares to satisfy the employee income tax withholdings |  | $ 2.7 |
Vested (in shares) |  | 55,399 |
Risk-free interest rate | 4.10% |  |
Volatility time period | 3 years |  |
Expected volatility | 33.50% |  |
Correlation to S&P 500 Index time period | 3 years |  |
Correlation with S&P index | 0.53 |  |
Unrecognized compensation expense |  | $ 68.9 |
Unrecognized compensation expense, period for recognition |  | 2 years 2 months 12 days |
PSUs | Minimum |  |  |
Stock-based Compensation |  |  |
Units ultimately expected to be awarded |  | 0.00% |
PSUs | Maximum |  |  |
Stock-based Compensation |  |  |
Units ultimately expected to be awarded |  | 200.00% |
Restricted Stock |  |  |
Stock-based Compensation |  |  |
Shares purchased to satisfy the employee income tax withholdings (in shares) |  | 77,324 |
Payments for the purchase of shares to satisfy the employee income tax withholdings |  | $ 10.0 |
Vested (in shares) |  | 201,565 |
Restricted Stock | Director |  |  |
Stock-based Compensation |  |  |
Vesting period |  | 1 year |

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