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COMMON STOCK - Treasury Stock (Narrative) (Details) - USD ($)
shares in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
May 31, 2019
Nov. 30, 2017
Treasury Stock          
Aggregate cost of stock repurchases $ 263,300,000 $ 795,500,000 $ 763,300,000    
Treasury Stock          
Treasury Stock          
Shares repurchased (in shares) 1.5 5.5 7.7    
Aggregate cost of stock repurchases $ 263,300,000 $ 795,500,000 $ 763,300,000    
November 2017          
Treasury Stock          
Authorized amount for share repurchase         $ 1,000,000,000.0
May 2019          
Treasury Stock          
Authorized amount for share repurchase       $ 1,000,000,000.0