XML 101 R86.htm IDEA: XBRL DOCUMENT v3.23.1
STOCK-BASED COMPENSATION (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended
Feb. 28, 2023
Mar. 31, 2023
Mar. 31, 2022
Stock-based Compensation      
Stock-based compensation expense   $ 16.9 $ 9.1
Payments for the purchase of shares to satisfy the employee income tax withholdings   $ 12.7 $ 8.4
Restricted Stock Units      
Stock-based Compensation      
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  
PSUs      
Stock-based Compensation      
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)   21,459  
Payments for the purchase of shares to satisfy the employee income tax withholdings   $ 2.7  
Vested (in shares)   55,399  
Risk-free interest rate 4.10%    
Volatility time period 3 years    
Expected volatility 33.50%    
Correlation to S&P 500 Index time period 3 years    
Correlation with S&P index 0.53    
Unrecognized compensation expense   $ 68.9  
Unrecognized compensation expense, period for recognition   2 years 2 months 12 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      
Stock-based Compensation      
Shares purchased to satisfy the employee income tax withholdings (in shares)   77,324  
Payments for the purchase of shares to satisfy the employee income tax withholdings   $ 10.0  
Vested (in shares)   201,565  
Restricted Stock | Director      
Stock-based Compensation      
Vesting period   1 year