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SHAREHOLDERS' EQUITY - Preferred shares (Details) - USD ($)
Jan. 17, 2020
Nov. 07, 2016
May 20, 2013
Dec. 31, 2020
Dec. 31, 2019
Class of Stock [Line Items]          
Preferred shares, aggregate liquidation value outstanding       $ 550,000,000 $ 775,000,000
Series D 5.50% Preferred Shares          
Class of Stock [Line Items]          
Preferred shares, aggregate liquidation value issued     $ 225,000,000    
Preferred shares, dividend rate     5.50%    
Preferred shares, par value per share (in usd per share)     $ 0.0125    
Preferred shares, liquidation preference per share (in usd per share)     25.00    
Preferred shares, redemption price per share (in usd per share)     $ 25.00    
Preferred shares, number of shares redeemed (in shares) 9,000,000        
Preferred shares, aggregate liquidation value outstanding $ 225,000,000        
Series E 5.50% Preferred Shares          
Class of Stock [Line Items]          
Preferred shares, aggregate liquidation value issued   $ 550,000,000      
Preferred shares, dividend rate   5.50%      
Preferred shares, par value per share (in usd per share)   $ 0.0125      
Preferred shares, liquidation preference per share (in usd per share)   2,500      
Preferred shares, redemption price per share (in usd per share)   $ 2,500