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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
Mar. 27, 2025
May 05, 2020
Aug. 31, 2024
Feb. 29, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Related Party Transaction [Line Items]                  
Maximum percentage of interest on amounts due from affiliates (percent)             7.05%    
Percentage of estimated realizable tax benefit to be paid by corporate taxpayers on exchange transactions             85.00%    
Payment of aircraft related expenses         $ 0.4 $ 0.6 $ 1.4 $ 0.6  
Interest and other income         53.6 52.2 159.2 161.9  
Fair value of assets         11,634.8   11,634.8    
Carlyle Secured Lending, Inc. Merger                  
Related Party Transaction [Line Items]                  
Issuance of common stock (in shares) 3,004,808   2,000,000            
Net asset value (in dollars per share) $ 16.64                
Expiration period (in years) 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         198.7   198.7   $ 40.4
Level III                  
Related Party Transaction [Line Items]                  
Fair value of assets         10,055.0   10,055.0   7,932.5
Level III | Other                  
Related Party Transaction [Line Items]                  
Fair value of assets         37.6   37.6    
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         $ 19.1   $ 19.1   $ 22.8
Accrued interest percentage         1.00%   1.00%    
Floor rate (percent)         3.50%   3.50%    
Actual rate (percent)         0.0625   0.0625    
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 $ 0.8 $ 2.6