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STOCK-BASED COMPENSATION - Narrative - Stock Options (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
STOCK-BASED COMPENSATION          
Proceeds from stock options exercised   $ 2,200,000      
Exercise of option, tax benefit   $ 13,100,000      
Weighted average fair value (in dollars per share)   $ 128.86 $ 116.08 $ 167.10  
Fair value of options vested   $ 10,800,000 $ 5,800,000 $ 6,900,000  
Performance measurement period two | Minimum          
STOCK-BASED COMPENSATION          
Return performance, percent of target stock price         41.00%
Stock Options          
STOCK-BASED COMPENSATION          
Unrecognized compensation cost   $ 22,200,000      
Weighted-average period for recognition of unrecognized compensation cost (in years)   3 years 3 months 18 days      
Intrinsic value of stock options exercised   $ 51,400,000 $ 6,800,000 $ 50,200,000  
Granted (in dollars per share)   $ 241.19      
Dividend yield   0.00% 0.00% 0.00%  
Dividends   $ 0 $ 0 $ 0  
Granted (in shares)   71,397      
Stock Options | Chairman and Chief Executive Officer          
STOCK-BASED COMPENSATION          
Granted (in dollars per share) $ 300        
Exercise price premium (percentage) 25.00%        
Post-exercise holding requirement period (in years) 2 years        
Expected term (in years) 6 years 10 months 24 days        
Dividend yield 0.00%        
Expected volatility rate (percentage) 52.00%        
Risk free rate (percentage) 0.92%        
Discount rate (percentage) 8.80%        
Stock Options | Minimum          
STOCK-BASED COMPENSATION          
Expected term (in years)   5 years 5 years 5 years  
Stock Options | One year from the grant date          
STOCK-BASED COMPENSATION          
Vesting period   1 year      
Stock Options | Three years from the grant date          
STOCK-BASED COMPENSATION          
Vesting period   3 years      
Vesting percentage   33.00%      
Stock Options | Four years from the grant date          
STOCK-BASED COMPENSATION          
Vesting period   4 years      
Vesting percentage   25.00%      
Stock Options | Six years from the grant date          
STOCK-BASED COMPENSATION          
Vesting period   6 years      
Performance Options          
STOCK-BASED COMPENSATION          
Unrecognized compensation cost   $ 36,500,000      
Weighted-average period for recognition of unrecognized compensation cost (in years)   1 year 9 months 18 days      
Weighted average fair value (in dollars per share)     $ 142.54 $ 230.81  
Granted (in dollars per share)   $ 0      
Expected term (in years)     7 years 7 years  
Dividend yield     0.00% 0.00%  
Dividends     $ 0 $ 0  
Expected volatility rate (percentage)     51.00% 51.00%  
Risk free rate (percentage)     1.03% 2.54%  
Granted (in shares)   0      
Return performance, percent of target stock price       81.00%  
Maximum number of shares for earned (in shares)       27,132  
Performance awards earned (in shares)   481,669      
Performance Options | Chairman and Chief Executive Officer          
STOCK-BASED COMPENSATION          
Granted (in dollars per share) $ 300        
Exercise price premium (percentage) 25.00%        
Post-exercise holding requirement period (in years) 2 years        
Expected term (in years) 7 years 6 months 14 days        
Dividend yield 0.00%        
Expected volatility rate (percentage) 52.00%        
Risk free rate (percentage) 0.92%        
Discount rate (percentage) 8.80%        
Performance Options | Minimum          
STOCK-BASED COMPENSATION          
Return performance, percent of target stock price       41.00%  
Performance Options | Performance measurement period one          
STOCK-BASED COMPENSATION          
Return performance, percent of target stock price 81.00%   81.00%   110.00%
Maximum number of shares for earned (in shares) 31,940   31,940   52,332
Performance Options | Performance measurement period one | Minimum          
STOCK-BASED COMPENSATION          
Return performance, percent of target stock price 41.00%   41.00%   70.00%
Performance Options | Performance measurement period two          
STOCK-BASED COMPENSATION          
Return performance, percent of target stock price 135.00%   135.00%   81.00%
Maximum number of shares for earned (in shares) 363,464   363,464   21,982
Performance Options | Performance measurement period two | Minimum          
STOCK-BASED COMPENSATION          
Return performance, percent of target stock price 81.00%   81.00%