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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Total remaining unrecognized compensation cost $ 134.8   $ 134.8  
Unrecognized compensation cost, recognition period     33 months  
Option Awards        
Allocation of stock-based compensation expense        
Options granted (in shares)     800  
Weighted average exercise price of options granted (in dollars per share)     $ 135.80  
Average risk-free interest rate 2.90% 1.80% 2.90% 1.80%
Expected volatility (as a percent) 29.00% 33.00% 29.10% 33.00%
Restricted Stock Units (RSUs)        
Allocation of stock-based compensation expense        
Non-option equity instruments granted (in shares)     200  
Weighted average grant date fair value of non-option equity units granted (in dollars per share)     $ 135.70  
Market Based Restricted Stock Units        
Allocation of stock-based compensation expense        
Non-option equity instruments granted (in shares)     42  
Weighted average grant date fair value of non-option equity units granted (in dollars per share)     $ 148.69  
Non-option instruments grants in previous period (in shares)     50  
Non-option equity units performance measurement period     3 years  
Average risk-free interest rate     2.70% 1.70%
Expected volatility (as a percent)     29.70% 30.20%
Minimum | Market Based Restricted Stock Units        
Allocation of stock-based compensation expense        
Non-option equity units granted as percentage of target     0.00%  
Maximum | Market Based Restricted Stock Units        
Allocation of stock-based compensation expense        
Non-option equity units granted as percentage of target     175.00%