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Related Party Transactions - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
May 05, 2020
Jan. 01, 2020
Aug. 31, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Related Party Transaction [Line Items]                
Maximum percentage of interest on amounts due from affiliates (percent)           7.02%    
Tax receivable agreement termination, cash payments per partnership unit exchanged (in dollars per share)   $ 1.50            
Tax receivable agreement termination, term of annual installments   5 years            
Tax receivable agreement termination, annual cash payments per partnership unit exchanged (in dollars per share)   $ 0.30            
Conversion of units, deferred consideration obligation, discount   $ 11.3            
Percentage of estimated realizable tax benefit to be paid by corporate taxpayers on exchange transactions           85.00%    
Interest and other income       $ 52.2 $ 57.9 $ 161.9 $ 152.1  
Fair value of assets       8,020.4   8,020.4    
Reversed unrealized income       $ 20.4 (145.7) $ (107.2) (325.7)  
Carlyle Secured Lending, Inc. Merger                
Related Party Transaction [Line Items]                
Issuance of common stock (in shares)     2,000,000          
Share price (in dollars per share)       $ 8.92   $ 8.92    
Reversed unrealized income       $ 48.5   $ 48.5    
Net asset value (in dollars per share)       $ 16.85   $ 16.85    
Level III                
Related Party Transaction [Line Items]                
Fair value of assets       $ 7,428.4   $ 7,428.4   $ 7,379.4
Level III | BDC preferred shares | Consensus Pricing                
Related Party Transaction [Line Items]                
Fair value of assets               81.7
Affiliated Entity                
Related Party Transaction [Line Items]                
Notes receivable and accrued interest from affiliates       $ 21.8   $ 21.8   $ 25.0
Accrued interest percentage       1.00%   1.00%    
Floor rate       3.50%   3.50%    
Actual rate       0.0700   0.0700    
Related Party | Carlyle Secured Lending, Inc.                
Related Party Transaction [Line Items]                
Purchase of investment (in shares) 2,000,000              
Purchase of investment (in dollars per share) $ 25              
Dividend rate, percentage 7.00%              
Dividend rate, payable in shares, percentage 9.00%              
Initial conversion price (in usd per share) $ 9.50              
Interest and other income       $ 0.9 $ 0.9 $ 2.6 $ 2.6