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STOCK-BASED COMPENSATION - Plans (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
shares
Sep. 30, 2019
shares
Mar. 31, 2019
shares
Dec. 31, 2019
USD ($)
plan
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
STOCK-BASED COMPENSATION            
Stock-based compensation plans | plan       2    
Compensation expense on share-based plans | $       $ 63.4 $ 57.1 $ 52.3
Excess tax benefit realized for tax deductions from non-qualified stock option exercises and disqualifying dispositions of incentive stock options | $       $ 25.9 $ 8.5 $ 96.7
Stock options            
STOCK-BASED COMPENSATION            
Granted (in shares) 50,000 52,000 1,570,000      
2011 Omnibus Incentive Plan            
STOCK-BASED COMPENSATION            
Aggregate amount of common stock authorized (in shares) 43,500,000     43,500,000    
Reduction in number of shares for each share granted       2.16    
Vesting period       5 years    
Granted (in shares)       24,555,792    
Expiration period (in years)       10 years    
Shares available for grant 14,169,367     14,169,367    
2017 Directors plan            
STOCK-BASED COMPENSATION            
Aggregate amount of common stock authorized (in shares) 1,250,000     1,250,000    
Granted (in shares)       68,774    
Shares available for grant 1,181,226     1,181,226    
Number of common shares held and expected to vest for eligibility under plan 9,000     9,000