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STOCK-BASED COMPENSATION (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award |  |
Stock-based compensation expense | $ 9.1 | $ 11.7
Payments for the purchase of shares to satisfy the employee income tax withholdings | $ 8.4 | $ 5.7
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 |
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) | 65,429 |
Payments for the purchase of shares to satisfy the employee income tax withholdings | $ 7.8 |
Vested (in shares) | 176,343 |
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 |
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 | 1.75% |
Volatility time period | 3 years |
Expected volatility | 32.20% |
Correlation to S&P 500 Index time period | 3 years |
Correlation with S&P index | 0.51 |
Unrecognized compensation expense | $ 50.6 |
Unrecognized compensation expense, period for recognition | 2 years 2 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) | 175,047 |

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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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