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Related Party Transactions - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
May 05, 2020
Aug. 31, 2024
Feb. 29, 2024
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Related Party Transaction [Line Items]            
Maximum percentage of interest on amounts due from affiliates (percent)       7.02%    
Percentage of estimated realizable tax benefit to be paid by corporate taxpayers on exchange transactions       85.00%    
Payment of aircraft related expenses       $ 0.4    
Interest and other income       50.6 $ 57.6  
Fair value of assets       $ 9,873.2    
Carlyle Secured Lending, Inc. Merger            
Related Party Transaction [Line Items]            
Issuance of common stock (in shares)   2,000,000   3,004,808    
Net asset value (in dollars per share)       $ 16.64    
Expiration period       2 years    
Carlyle Secured Lending, Inc. Merger | Share-Based Payment Arrangement, Tranche One            
Related Party Transaction [Line Items]            
Vesting percentage     33.33%      
Carlyle Secured Lending, Inc. Merger | Share-Based Payment Arrangement, Tranche Two            
Related Party Transaction [Line Items]            
Vesting percentage     33.33%      
Carlyle Secured Lending, Inc. Merger | Share-Based Payment Arrangement, Tranche Three            
Related Party Transaction [Line Items]            
Vesting percentage     33.33%      
Level I            
Related Party Transaction [Line Items]            
Fair value of assets       $ 83.2   $ 40.4
Level I | BDC preferred shares | Other            
Related Party Transaction [Line Items]            
Fair value of assets       48.6    
Level III            
Related Party Transaction [Line Items]            
Fair value of assets       9,379.3   7,932.5
Level III | Other            
Related Party Transaction [Line Items]            
Fair value of assets       48.6    
Level III | BDC preferred shares | Other            
Related Party Transaction [Line Items]            
Fair value of assets           53.4
Affiliated Entity            
Related Party Transaction [Line Items]            
Notes receivable and accrued interest from affiliates       $ 21.7   $ 22.8
Accrued interest percentage       1.00%    
Floor rate       3.50%    
Actual rate       0.0650    
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       $ 0.8 $ 0.9