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Organization and Description of Business - Estimated NAV Per Share (Details) - $ / shares
Jun. 09, 2021
Jun. 10, 2020
Class A Common Stock    
Subsidiary, Sale of Stock    
Net Asset Value Per Share $ 0 $ 0
Class B Common Stock    
Subsidiary, Sale of Stock    
Net Asset Value Per Share 0 0
Class K Common Stock    
Subsidiary, Sale of Stock    
Net Asset Value Per Share 9.85 8.56
Class K-I Common Stock    
Subsidiary, Sale of Stock    
Net Asset Value Per Share 9.77 8.55
Class K-T Common Stock    
Subsidiary, Sale of Stock    
Net Asset Value Per Share $ 9.85 $ 8.56