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STOCK-BASED COMPENSATION - Equity Awards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
STOCK-BASED COMPENSATION          
Total intrinsic value of options exercised $ 21.0   $ 25.3 $ 28.2 $ 36.2
Stock units expected to vest (in shares) 14,058     14,058  
Stock Options          
STOCK-BASED COMPENSATION          
Weighted-average grant-date fair value of options granted (in dollars per share) $ 26.89     $ 25.79 $ 18.78
Cash received from option exercises $ 17.7   $ 29.9 $ 24.5 $ 43.8
Total unrecognized compensation expense related to non-vested shares granted to employees $ 68.0     $ 68.0  
Cost expected to be recognized over a weighted-average period       2 years 4 months 24 days  
Restricted stock units          
Weighted Average Grant-Date Fair Value          
Granted (in dollars per share) $ 92.14   $ 71.72 $ 89.12 $ 62.78
Restricted Stock Units and Performance Share Units          
STOCK-BASED COMPENSATION          
Total unrecognized compensation expense related to non-vested shares granted to employees $ 46.4     $ 46.4  
Cost expected to be recognized over a weighted-average period       2 years 2 months 12 days  
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) 14 304      
Vested (in shares)       (344)  
Forfeited/cancelled (in shares)       (4)  
Non-vested at the end of the period (in shares) 917     917  
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) $ 92.14 $ 86.28      
Vested (in dollars per share)       62.27  
Forfeited/cancelled (in dollars per share)       60.15  
Non-vested at the end of the period (in dollars per share) $ 68.89     $ 68.89  
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 $ 1.6     $ 1.6  
Cost expected to be recognized over a weighted-average period       1 year 1 month 6 days