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CAPITAL STOCK - Narrative (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Nov. 03, 2022
USD ($)
$ / shares
shares
Aug. 06, 2020
USD ($)
Sep. 30, 2023
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
shares
Jun. 30, 2022
USD ($)
shares
Sep. 30, 2023
USD ($)
publicOffering
$ / shares
shares
Sep. 30, 2022
USD ($)
shares
Dec. 31, 2022
$ / shares
Jan. 31, 2022
USD ($)
Dec. 31, 2020
USD ($)
Class of Stock [Line Items]                    
Authorized amount of stock available for repurchase (up to) | $                   $ 1,500.0
Sale of stock, option to purchase additional shares (in days)             30 days      
Preferred stock, par value (USD per share) | $ / shares     $ 0.01     $ 0.01   $ 0.01    
Preferred stock, redemption price (in dollars per share) | $ / shares     $ 25.00     $ 25.00        
Number Of Public Offerings | publicOffering           2        
Preferred stock                    
Class of Stock [Line Items]                    
Authorized amount of stock available for repurchase (up to) | $ $ 1,600.0                  
Shares repurchased (in shares)     0     0        
Stock repurchase program, number of shares authorized to be repurchased (in shares) 63,500,000                  
Series F Preferred Stock                    
Class of Stock [Line Items]                    
Preferred stock, par value (USD per share) | $ / shares $ 0.01                  
Stock repurchase program, number of shares authorized to be repurchased (in shares) 28,800,000                  
Preferred stock dividend rate, percentage 6.95%         6.95%        
Series G Preferred Stock                    
Class of Stock [Line Items]                    
Preferred stock, par value (USD per share) | $ / shares $ 0.01                  
Stock repurchase program, number of shares authorized to be repurchased (in shares) 17,000,000                  
Preferred stock dividend rate, percentage 6.50%         6.50%        
Series I                    
Class of Stock [Line Items]                    
Preferred stock, par value (USD per share) | $ / shares $ 0.01                  
Stock repurchase program, number of shares authorized to be repurchased (in shares) 17,700,000                  
Preferred stock dividend rate, percentage 6.75%         6.75%        
Current Share Repurchase Program                    
Class of Stock [Line Items]                    
Authorized amount of stock available for repurchase (up to) | $                 $ 1,500.0  
Shares repurchased (in shares)     0 0   0 0      
At-the-market Sale Program                    
Class of Stock [Line Items]                    
Aggregate stock offering price (up to) | $   $ 1,500.0                
Sale of stock, shares issued (in shares)     900,000 36,800,000   26,200,000 45,200,000      
Proceeds from sale of stock | $     $ 17.8 $ 913.9   $ 580.5 $ 1,100.0      
Public Offering                    
Class of Stock [Line Items]                    
Sale of stock, shares issued (in shares)         25,000,000   50,000,000      
Proceeds from sale of stock | $         $ 665.0   $ 1,310.0      
Public Offering Additional Share Purchase Option                    
Class of Stock [Line Items]                    
Sale of stock, shares issued (in shares)             3,750,000      
Proceeds from sale of stock | $       $ 99.8     $ 196.5