Annual report pursuant to Section 13 and 15(d)

STOCK???BASED COMPENSATION - Narrative (Details)

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STOCK‑BASED COMPENSATION - Narrative (Details)
$ in Millions
12 Months Ended
Mar. 16, 2017
installment
shares
Jul. 19, 2016
installment
shares
Jun. 14, 2013
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Oct. 22, 2020
shares
Mar. 31, 2017
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options granted (in shares) | shares       0 0 0    
Options, outstanding, intrinsic value | $       $ 1.6        
Options, exercisable, intrinsic value | $       1.6        
Options, exercised, intrinsic value | $       $ 19.8        
Exercised (in shares) | shares       3,326,000        
Term for outstanding stock       4 years 1 month 6 days        
Remaining contractual term       4 years 1 month 6 days        
Compensation cost not yet recognized, period for recognition       1 year 9 months 18 days        
Tax benefit from compensation expense | $       $ 11.5 $ 9.1 $ 7.8    
Compensation not yet recognized, stock options | $       $ 16.4        
Stock options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options granted (in shares) | shares 793,738 1,274,549 2,799,408          
Award vesting rights     25.00%          
Expiration period 10 years 10 years 10 years          
Number of installments | installment 4 5            
Restricted stock units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted (in shares) | shares       851,885        
Vesting period       3 years        
Stock-based compensation | $       $ 6.2 5.1 3.5    
Compensation not yet recognized, other than options | $       $ 7.4        
Compensation cost not yet recognized, period for recognition       1 year 9 months 18 days        
Performance stock units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted (in shares) | shares       650,774        
Stock-based compensation | $       $ 5.5 $ 1.7 $ 3.8    
Percentage of outstanding stock minimum       0.00%        
Percentage of outstanding stock maximum       200.00%        
Award vesting period       3 years        
2017 Incentive Award Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares authorized (in shares) | shares               5,800,000
Shares issued in period (in shares) | shares       0        
2020 Long Term Incentive Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares authorized (in shares) | shares             4,650,000