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STOCK-BASED EMPLOYEE COMPENSATION (Restricted Stock Units and Performance Share Units) (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Restricted Stock Units and Performance Share Units [Member]      
Share-Based Awards - Shares      
Unvested at December 31, 2015 637,257    
Granted (in shares) 193,601    
Vested (in shares) (286,354)    
Performance Share Units Adjustment (in shares) 2,865    
Forfeited (in shares) (66,232)    
Unvested at September 30, 2016 481,137 637,257  
Share-Based Awards - Weighted Average Grant Date Fair Value      
Unvested at December 31, 2015 $ 1,070.10    
Granted (in dollars per share) 1,304.28    
Vested (in dollars per share) 840.45    
Performance Share Units Adjustment (in dollars per share) 1,269.87    
Forfeited (in dollars per share) 1,276.01    
Unvested at September 30, 2016 $ 1,281.80 $ 1,070.10  
Total unrecognized estimated compensation expense, unvested share-based awards $ 328.9    
Total future compensation cost related to unvested share-based awards, expected period of recognition 1 year 11 months    
Restricted Stock Units (RSUs) [Member]      
Share-Based Awards - Shares      
Granted (in shares) 107,866    
Share-Based Awards - Weighted Average Grant Date Fair Value      
Granted (in dollars per share) $ 1,305.90    
Vesting period (in years) 3 years    
Grant date fair value $ 140.9    
Performance Share Units 2016 Grants [Member]      
Share-Based Awards - Shares      
Granted (in shares) 85,735    
Share-Based Awards - Weighted Average Grant Date Fair Value      
Granted (in dollars per share) $ 1,302.25    
Grant date fair value $ 111.6    
Estimated number of probable shares to be issued (in shares) 79,412    
Maximum shares that could be issued (in shares) 179,208    
Minimum shares that could be issued (in shares) 46,367    
Performance Share Units 2015 Grants [Member]      
Share-Based Awards - Shares      
Granted (in shares)   107,623  
Unvested at September 30, 2016 78,470    
Share-Based Awards - Weighted Average Grant Date Fair Value      
Granted (in dollars per share)   $ 1,237.53  
Grant date fair value   $ 133.2  
Estimated number of probable shares to be issued (in shares) 129,623    
Maximum shares that could be issued (in shares) 193,624    
Minimum shares that could be issued (in shares) 46,192    
Performance Share Units 2014 Grants [Member]      
Share-Based Awards - Shares      
Granted (in shares)     72,277
Unvested at September 30, 2016 44,532    
Share-Based Awards - Weighted Average Grant Date Fair Value      
Granted (in dollars per share)     $ 1,329.11
Grant date fair value     $ 96.1
Estimated number of probable shares to be issued (in shares) 71,993    
Maximum shares that could be issued (in shares) 89,828    
Minimum shares that could be issued (in shares) 34,801