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BUSINESS AND ORGANIZATION - Net Asset Value Per Share (Q2) (Details) - $ / shares
Aug. 04, 2021
Jul. 26, 2021
Jun. 30, 2021
May 05, 2021
Mar. 25, 2021
Feb. 25, 2021
Feb. 01, 2021
Jan. 27, 2021
Jan. 22, 2021
Dec. 31, 2020
Jun. 01, 2020
May 20, 2020
Dec. 31, 2019
Jan. 18, 2018
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]                            
NAV Per Share (in usd per share)     $ 26.05 $ 24.61       $ 23.03   $ 21.01 $ 21.01 $ 21.01 $ 30.48 $ 30.00
Subsequent Event                            
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]                            
NAV Per Share (in usd per share) $ 26.05 $ 24.61     $ 23.03 $ 21.01 $ 23.03 $ 23.03 $ 21.01