STOCK-BASED COMPENSATION (Details) - USD ($) $ in Millions	3 Months Ended
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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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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