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COMMON STOCK - Accelerated Share Repurchases (Details) - USD ($)
$ / shares in Units, shares in Millions
1 Months Ended
Jun. 30, 2019
May 31, 2019
Nov. 30, 2018
Oct. 31, 2018
Jul. 31, 2018
Apr. 30, 2018
Dec. 31, 2017
Nov. 30, 2017
November 2017                
Accelerated Share Repurchase                
Amount Paid               $ 150,000,000.0
Shares repurchased (in shares)             1.3 1.1
Initial delivery, price per share (in dollars per share)               $ 109.86
Value of shares as a percent of total contract value               80.00%
Final settlement per share price (in dollars per share)             $ 114.85  
April 2018                
Accelerated Share Repurchase                
Amount Paid           $ 400,000,000.0    
Shares repurchased (in shares)         2.8 2.5    
Initial delivery, price per share (in dollars per share)           $ 127.36    
Value of shares as a percent of total contract value           80.00%    
Final settlement per share price (in dollars per share)         $ 142.37      
October 2018                
Accelerated Share Repurchase                
Amount Paid       $ 250,000,000.0        
Shares repurchased (in shares)     1.7 1.4        
Initial delivery, price per share (in dollars per share)       $ 139.22        
Value of shares as a percent of total contract value       80.00%        
Final settlement per share price (in dollars per share)     $ 150.54          
Initial Delivery of Shares Settled May 2019                
Accelerated Share Repurchase                
Amount Paid   $ 150,000,000.0            
Shares repurchased (in shares)   0.7            
Initial delivery, price per share (in dollars per share)   $ 178.66            
Value of shares as a percent of total contract value   80.00%            
Purchased and sold in May 2019                
Accelerated Share Repurchase                
Shares repurchased (in shares)   0.8            
Final settlement per share price (in dollars per share)   $ 178.42            
Initial Delivery Of Shares Settled June 2019                
Accelerated Share Repurchase                
Amount Paid   $ 100,000,000.0            
Shares repurchased (in shares)   0.5            
Initial delivery, price per share (in dollars per share)   $ 170.02            
Value of shares as a percent of total contract value   80.00%            
Purchased in May 2019 and sold in June 2019                
Accelerated Share Repurchase                
Shares repurchased (in shares) 0.6              
Final settlement per share price (in dollars per share) $ 178.46