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STOCK-BASED COMPENSATION (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 31, 2022 | Feb. 28, 2022 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Stock-based compensation expense |  |  | $ 7.0 | $ 5.5 | $ 16.1 | $ 17.2
Payments for the purchase of shares to satisfy the employee income tax withholdings |  |  |  |  | $ 8.6 | $ 5.8
RSAs and RSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Number of shares of common stock of which unit is convertible (in shares) |  |  | 1 |  | 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 |
Shares purchased to satisfy the employee income tax withholdings (in shares) |  |  |  |  | 66,954 |
Payments for the purchase of shares to satisfy the employee income tax withholdings |  |  |  |  | $ 8.0 |
Vested (in shares) |  |  |  |  | 196,447 |
RSAs and RSUs | Director |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Vesting period |  |  |  |  | 1 year |
PSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Number of shares of common stock of which unit is convertible (in shares) |  |  | 1 |  | 1 |
Vesting period |  |  |  |  | 3 years |
Shares purchased to satisfy the employee income tax withholdings (in shares) |  |  |  |  | 5,245 |
Payments for the purchase of shares to satisfy the employee income tax withholdings |  |  |  |  | $ 0.6 |
Vested (in shares) |  |  |  |  | 16,834 |
Risk-free interest rate | 2.88% | 1.75% |  |  |  |
Volatility time period | 3 years | 3 years |  |  |  |
Expected volatility | 32.80% | 32.20% |  |  |  |
Correlation to S&P 500 Index time period | 3 years | 3 years |  |  |  |
Correlation with S&P index | 0.52 | 0.51 |  |  |  |
Unrecognized compensation expense |  |  | $ 47.3 |  | $ 47.3 |
Unrecognized compensation expense, period for recognition |  |  |  |  | 2 years |
PSUs | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Units ultimately expected to be awarded |  |  |  |  | 0.00% |
PSUs | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Units ultimately expected to be awarded |  |  |  |  | 200.00% |
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Vested (in shares) |  |  |  |  | 178,563 |

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