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Related Party Transactions - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
May 05, 2020
Jan. 01, 2020
Mar. 31, 2024
Mar. 31, 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     $ 57.6 $ 44.0  
Fair value of assets     8,167.5    
Level III          
Related Party Transaction [Line Items]          
Fair value of assets     7,566.6   $ 7,379.4
Level III | BDC preferred shares          
Related Party Transaction [Line Items]          
Fair value of assets     90.1   81.7
Affiliated Entity          
Related Party Transaction [Line Items]          
Notes receivable and accrued interest from affiliates     $ 23.5   $ 25.0
Floor rate     3.50%    
Actual rate     0.0750    
Affiliated Entity | WSJ Prime Rate          
Related Party Transaction [Line Items]          
Accrued interest percentage     1.00%    
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