Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION, Stock Repurchase (Details)

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BASIS OF PRESENTATION, Stock Repurchase (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2018
Aug. 31, 2018
Nov. 03, 2018
Sep. 30, 2018
Share Repurchase Program        
Value of shares repurchased     $ 434.2  
Number of shares repurchased     23.6  
Share Repurchase Program September 2018        
Share Repurchase Program        
Common stock share repurchase authorized amount       $ 500.0
Remaining amount under share repurchase program     $ 416.0  
Accelerated Share Repurchase Agreement June 2018        
Share Repurchase Program        
Value of shares repurchased $ 250.0      
Number of shares repurchased   12.4