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STOCK-BASED COMPENSATION - Plans (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
shares
Sep. 30, 2018
shares
Jun. 30, 2018
shares
Mar. 31, 2018
shares
Dec. 31, 2018
USD ($)
plan
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
STOCK-BASED COMPENSATION              
Number of Stock Based Compensation Plans | plan         2    
Compensation expense on share-based plans | $         $ 57.1 $ 52.3 $ 45.8
Excess tax benefit realized for tax deductions from non-qualified stock option exercises and disqualifying dispositions of incentive stock options | $         $ 8.5 $ 96.7 $ 20.8
Stock options              
STOCK-BASED COMPENSATION              
Common stock granted, net of cancellations (in shares) 194,000 11,000 360,000 2,615,000      
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    
Expiration period (in years)         10 years    
Common stock granted, net of cancellations (in shares)         22,740,597    
Shares available for grant 16,611,623       16,611,623    
2017 Directors plan              
STOCK-BASED COMPENSATION              
Aggregate amount of common stock authorized (in shares) 1,250,000       1,250,000    
Common stock granted, net of cancellations (in shares)         47,880    
Shares available for grant 1,202,120       1,202,120    
Number of common shares held and expected to vest for eligibility under plan 9,000       9,000