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STOCK-BASED COMPENSATION (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Feb. 29, 2024
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Stock-based Compensation            
Payments for the purchase of shares to satisfy the employee income tax withholdings       $ 27.2 $ 13.0  
Employees            
Stock-based Compensation            
Stock-based compensation expense   $ 9.8 $ 9.1 21.3 26.0  
Non-employee Director            
Stock-based Compensation            
Stock-based compensation expense   $ 0.5 $ 0.4 $ 0.8 $ 0.9  
RSUs            
Stock-based Compensation            
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 between 2017 and 2023       55 years    
Qualified retirement eligibility number of years of service for grants awarded between 2017 and 2023       10 years    
Qualified retirement eligibility age for grants awarded in or after 2024       55 years    
Qualified retirement eligibility number of years of service for grants awarded in or after 2024       10 years    
Period of advance notice required in or after 2024       6 months    
Shares purchased to satisfy the employee income tax withholdings (in shares)       99,194    
Payments for the purchase of shares to satisfy the employee income tax withholdings       $ 18.5    
Shares vested, prompting share repurchases to cover employees' tax obligations       262,717    
RSUs | Non-employee Director            
Stock-based Compensation            
Vesting period       1 year    
PSUs            
Stock-based Compensation            
Number of shares of common stock of which unit is convertible (in shares)   1   1    
Vesting period       3 years    
Non vested RSAs   111,104   111,104   134,484
Shares purchased to satisfy the employee income tax withholdings (in shares)       46,867    
Payments for the purchase of shares to satisfy the employee income tax withholdings       $ 8.6    
Vested (in shares)       110,376    
Risk-free interest rate 4.41%          
Volatility time period 2 years 10 months 9 days          
Expected volatility 21.56%          
Correlation to S&P 500 Index time period 2 years 10 months 9 days          
Correlation with S&P index 0.39          
Unrecognized compensation expense   $ 74.6   $ 74.6    
Unrecognized compensation expense, period for recognition       2 years 1 month 6 days    
PSUs | Minimum            
Stock-based Compensation            
Units ultimately expected to be awarded       0.00%    
PSUs | Maximum            
Stock-based Compensation            
Units ultimately expected to be awarded       200.00%    
Restricted Stock and Restricted Stock Units            
Stock-based Compensation            
Non vested RSAs   578,202   578,202   638,181
Vested (in shares)       263,071