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SHARE INCENTIVE PLANS (Summary of Restricted Share Units Activity) (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 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) 1,241,432    
Restricted share units vested (in shares) (514,667)    
Restricted share units canceled (in shares) (147,187)    
Non vested restricted share units at the end of the period (in shares) 3,873,741    
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) 103.59 $ 70.32  
Restricted share units vested (in USD per share) 50.81    
Restricted share units cancelled (in USD per share) 69.39    
Non vested restricted share units at the end of the period (in USD per share) $ 79.13    
Total intrinsic value of all outstanding restricted share units $ 428.7   $ 304.3
Performance Shares      
Number of Shares      
Non vested restricted share units at the end of the period (in shares) 36,000    
Minimum | Performance Shares      
Weighted Average Grant Date Fair Value      
Award vesting rights, percentage of the target 0.00%    
Maximum | Performance Shares      
Weighted Average Grant Date Fair Value      
Award vesting rights, percentage of the target 175.00%