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Related Party Transactions - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
May 05, 2020
Jan. 01, 2020
Sep. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
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%    
Payment of aircraft related expenses       $ 0.4 $ 0.4   $ 0.9  
Interest and other income     $ 57.9   35.5 $ 152.1 92.5  
Fair value of assets     7,818.3     7,818.3    
Level III                
Related Party Transaction [Line Items]                
Fair value of assets     7,201.7     7,201.7   $ 6,983.9
Level III | BDC preferred shares                
Related Party Transaction [Line Items]                
Fair value of assets     79.3     79.3   76.9
Affiliated Entity                
Related Party Transaction [Line Items]                
Notes receivable and accrued interest from affiliates     $ 26.0     $ 26.0   $ 23.2
Floor rate     3.50%     3.50%    
Actual rate     0.0750     0.0750    
Affiliated Entity | WSJ Prime Rate                
Related Party Transaction [Line Items]                
Accrued interest percentage     1.00%     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 $ 2.6 $ 2.6