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STOCK-BASED COMPENSATION (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Stock-based compensation expense | $ 5.5 | $ 4.6 | $ 17.2 | $ 12.9
Payments for the purchase of shares to satisfy the employee income tax withholdings |  |  | $ 5.8 | $ 14.1
Restricted Stock and 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 |  | 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) |  |  | 50,661 |
Payments for the purchase of shares to satisfy the employee income tax withholdings |  |  | $ 4.9 |
Vested (in shares) |  |  | 156,273 |
Restricted Stock and Restricted Stock Units | Director |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Vesting period |  |  | 1 year |
Performance-Based 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 |  | 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 |
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 | $ 37.5 |  | $ 37.5 |
Unrecognized compensation expense, period for recognition |  |  | 2 years |
Performance-Based Restricted Stock Units | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Units ultimately expected to be awarded |  |  | 0.00% |
Performance-Based Restricted Stock Units | 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) |  |  | 139,971 |

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