Annual report pursuant to Section 13 and 15(d)

MANDATORILY REDEEMABLE PREFERRED STOCK - Narrative (Details)

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MANDATORILY REDEEMABLE PREFERRED STOCK - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended
Aug. 31, 2021
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Dividends Payable [Line Items]              
Investment company, cash distributions paid to common stockholders from ordinary income     53.20%   61.20%   71.30%
Investment company, cash distributions paid to common stockholders from capital gains     46.80%   38.80%   28.70%
Series E Term Preferred Stock              
Dividends Payable [Line Items]              
Preferred stock, dividend rate, percentage 6.375%            
Preferred stock, liquidation preference (in USD per share) $ 25.00            
Loss on extinguishment of debt $ 2.0            
4.875% 2028 Notes              
Dividends Payable [Line Items]              
Preferred stock, liquidation preference (in USD per share)   $ 25.00   $ 25.00   $ 25.00  
Notes Payable | 4.875% 2028 Notes              
Dividends Payable [Line Items]              
Interest rate 4.875% 4.875%   4.875%