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COMMON SHARE-BASED COMPENSATION - Narrative (Details)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
May 24, 2019
shares
Dec. 31, 2021
USD ($)
award
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
May 31, 2016
shares
May 31, 2010
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common share-based compensation expense   $ 140.1 $ 188.5 $ 207.5    
Income tax benefit from share-based compensation agreements   $ 30.0 27.8 38.1    
Number of award categories | award   2        
Fair value of vested shares   $ 187.9 $ 124.6 $ 177.1    
Weighted average fair value of shares granted (usd per share) | $ / shares   $ 22.61 $ 14.09 $ 19.66    
Unrecognized compensation cost related to non-vested shares   $ 164.7        
Weighted average non-vested shares compensation cost expected to recognize   2 years 1 month 13 days        
2016 GEIP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares authorized under share awards plan (shares) | shares         16.0  
2010 GEIP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares authorized under share awards plan (shares) | shares           8.5
Performance-vested awards | Award Date February 2019 | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Proportional vesting rate (percent)   0.00%        
Performance-vested awards | Award Date February 2019 | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Proportional vesting rate (percent)   150.00%        
Performance-vested awards | Award Date February 2020 | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Proportional vesting rate (percent)   0.00%        
Performance-vested awards | Award Date February 2020 | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Proportional vesting rate (percent)   150.00%        
Performance-vested awards | Award Date February 2021 | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Proportional vesting rate (percent)   0.00%        
Performance-vested awards | Award Date February 2021 | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Proportional vesting rate (percent)   150.00%        
OppenheimerFunds | Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock consideration (shares) | shares 6.2