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STOCK-BASED COMPENSATION - Equity Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
STOCK-BASED COMPENSATION            
Total intrinsic value of options exercised $ 14.0     $ 22.5 $ 42.2 $ 58.8
Stock units expected to vest (in shares) 13,815       13,815  
Stock Options            
STOCK-BASED COMPENSATION            
Weighted-average grant-date fair value of options granted (in dollars per share) $ 26.90       $ 25.81 $ 18.78
Cash received from option exercises $ 12.7     $ 21.7 $ 37.2 $ 65.5
Total unrecognized compensation expense related to non-vested shares granted to employees $ 59.7       $ 59.7  
Cost expected to be recognized over a weighted-average period         2 years 2 months 12 days  
Restricted stock units            
Weighted Average Grant-Date Fair Value            
Granted (in dollars per share) $ 89.84     $ 71.76 $ 89.12 $ 62.79
Restricted Stock Units and Performance Share Units            
STOCK-BASED COMPENSATION            
Total unrecognized compensation expense related to non-vested shares granted to employees $ 40.0       $ 40.0  
Cost expected to be recognized over a weighted-average period         2 years  
Stock units expected to vest (in shares) 900       900  
Number of Shares            
Non-vested at the beginning of the period (in shares)     947   947  
Granted (in shares) 1 14 304      
Vested (in shares)         (344)  
Forfeited/cancelled (in shares)         (7)  
Non-vested at the end of the period (in shares) 915       915  
Weighted Average Grant-Date Fair Value            
Non-vested at the beginning of the period (in dollars per share)     $ 60.52   $ 60.52  
Granted (in dollars per share) $ 89.84 $ 92.14 $ 86.28      
Vested (in dollars per share)         62.27  
Forfeited/cancelled (in dollars per share)         59.96  
Non-vested at the end of the period (in dollars per share) $ 68.94       $ 68.94  
Performance Share Units            
STOCK-BASED COMPENSATION            
Percentage of Target Performance Level         100.00%  
Performance Share Units | Maximum            
STOCK-BASED COMPENSATION            
Percentage of Target Performance Level         200.00%  
Performance Share Units | Minimum            
STOCK-BASED COMPENSATION            
Percentage of Target Performance Level         0.00%  
Other share-based awards            
STOCK-BASED COMPENSATION            
Total unrecognized compensation expense related to non-vested shares granted to employees $ 1.2       $ 1.2  
Cost expected to be recognized over a weighted-average period         1 year 1 month 6 days