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STOCK-BASED COMPENSATION (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Stock-based compensation expense | $ 26.6 | $ 21.7 | $ 21.8
Options exercised (in shares) |  | 10,834 | 358,649
Payments for the purchase of shares to satisfy the employee income tax withholdings | $ 6.2 | $ 14.2 | $ 11.0
Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
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 |  |
Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Total intrinsic value of stock options exercised |  | $ 0.9 | $ 26.0
RSAs and RSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Shares purchased to satisfy the employee income tax withholdings (in shares) | 53,929 |  |
Payments for the purchase of shares to satisfy the employee income tax withholdings | $ 5.3 |  |
Vested (in shares) | 166,598 | 272,258 | 313,856
PSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
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) | 9,982 |  |
Payments for the purchase of shares to satisfy the employee income tax withholdings | $ 0.9 |  |
Vested (in shares) | 29,468 | 48,053 | 69,372
Risk-free interest rate | 0.15% |  |
Volatility time period | 3 years |  |
Expected volatility | 31.80% |  |
Correlation to S&P 500 Index time period | 3 years |  |
Correlation with S&P index | 0.51 |  |
Unrecognized compensation expense | $ 25.5 |  |
Unrecognized compensation expense, period for recognition | 1 year 8 months 12 days |  |
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) | 149,071 |  |
Restricted Stock | Director |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Vesting period | 1 year |  |

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