Annual report pursuant to Section 13 and 15(d)

SHAREHOLDERS' EQUITY (Narrative) (Details)

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SHAREHOLDERS' EQUITY (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Apr. 24, 2019
Nov. 26, 2018
Class of Stock [Line Items]          
Stock Repurchase Program, Authorized Amount       $ 100.0 $ 200.0
Stock Repurchased During Period, Shares 24,400,000 5,400,000      
Payments for Repurchase of Common Stock $ 252.9 $ 47.5 $ 0.0    
Net proceeds from issuance of common shares $ 0.0 $ 0.0 $ 661.3    
Preferred Class A [Member]          
Class of Stock [Line Items]          
Preferred Stock, Shares Issued 0        
Preferred Stock, Shares Outstanding 0        
Preferred Stock, Shares Authorized 3,000,000        
Preferred Class B [Member]          
Class of Stock [Line Items]          
Preferred Stock, Shares Issued 0        
Preferred Stock, Shares Outstanding 0        
Preferred Stock, Shares Authorized 4,000,000        
Common Stock [Member]          
Class of Stock [Line Items]          
Stock Repurchased During Period, Shares 24,400,000 5,400,000      
Common Stock, New Shares, Issued     63,300,000    
Common stock, shares issued, price per share     $ 10.75