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INCENTIVE PLANS - Performance Share Units (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Weighted- average grant date fair value per share (in dollars per share):      
Weighted-average market value (in dollars per share) $ 77.65 $ 59.12 $ 37.35
Performance Share Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period used for calculation of performance goals 3 years    
Percentage of target shares earned 100.00%    
Number of shares of common stock equivalent to each target share   1  
Valuation Assumptions      
Expected volatility 24.93% 25.79% 24.37%
Expected dividend yield 1.75% 1.30% 0.40%
Unvested stock awards (in shares):      
Beginning of period (in shares) 1,786,726    
Granted (in shares) 495,099    
Canceled (in shares) (25,160)    
Payments (in shares) (488,304)    
End of period (in shares) 1,768,362 1,786,726  
Weighted- average grant date fair value per share (in dollars per share):      
Beginning of period (in dollars per share) $ 40.94    
Granted (in dollars per share) 83.24    
Canceled (in dollars per share) 44.07    
Payments (in dollars per share) 44.07    
End of period (in dollars per share) $ 51.88 $ 40.94  
Weighted-average market value (in dollars per share)   $ 59.22 $ 27.03
Minimum | Performance Share Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of target shares earned 0.00%    
Maximum | Performance Share Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of target shares earned 150.00%