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SHARE INCENTIVE PLANS (Summary of Restricted Share Units Activity) (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Restricted Share Units Outstanding      
Number of Shares      
Non vested restricted share units at the beginning of the period (in shares) 3,294,163    
Restricted share units granted (in shares) 1,548,174    
Restricted share units vested (in shares) (1,024,385)    
Restricted share units canceled (in shares) (207,822)    
Non vested restricted share units at the end of the period (in shares) 3,610,130    
Weighted Average Grant Date Fair Value      
Non vested restricted share units at the beginning of the period (in USD per share) $ 65.05    
Restricted share units granted (in USD per share) 105.21 $ 79.72  
Restricted share units vested (in USD per share) 60.06    
Restricted share units cancelled (in USD per share) 72.33    
Non vested restricted share units at the end of the period (in USD per share) $ 83.28    
Total intrinsic value of all outstanding restricted share units $ 395.6   $ 304.3
Performance Shares      
Number of Shares      
Non vested restricted share units at the end of the period (in shares) 36,000    
Weighted Average Grant Date Fair Value      
Award performance period 3 years    
Performance Shares | Minimum      
Weighted Average Grant Date Fair Value      
Award vesting rights, percentage of the target 0.00%    
Performance Shares | Maximum      
Weighted Average Grant Date Fair Value      
Award vesting rights, percentage of the target 175.00%