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Investments - Principal Investments in CLOs and Other Investments (Additional Information) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
May 31, 2023
May 31, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]          
Fair value of assets     $ 8,316.4 $ 7,962.9  
Carlyle FRL          
Debt and Equity Securities, FV-NI [Line Items]          
Investment loss $ 104.0 $ 176.9      
Carlyle FRL | Fortitude Holdings          
Debt and Equity Securities, FV-NI [Line Items]          
Percentage ownership 10.50% 13.50%      
Carlyle FRL | Global Credit          
Debt and Equity Securities, FV-NI [Line Items]          
Investment loss       $ 104.0 $ 176.9
Carlyle FRL | Global Credit | Fortitude Holdings          
Debt and Equity Securities, FV-NI [Line Items]          
Prior ownership percentage       13.50%  
Total investments in NGP          
Debt and Equity Securities, FV-NI [Line Items]          
Performance fees, income (loss)     35.5 $ 65.5 $ 560.7
Minimum | Carlyle FRL | Fortitude Holdings          
Debt and Equity Securities, FV-NI [Line Items]          
Percentage ownership   13.50%      
Minimum | Carlyle FRL | Global Credit | Fortitude Holdings          
Debt and Equity Securities, FV-NI [Line Items]          
Percentage ownership       10.50% 13.50%
Maximum | Carlyle FRL | Fortitude Holdings          
Debt and Equity Securities, FV-NI [Line Items]          
Percentage ownership   19.90%      
Maximum | Carlyle FRL | Global Credit | Fortitude Holdings          
Debt and Equity Securities, FV-NI [Line Items]          
Percentage ownership         19.90%
Level III          
Debt and Equity Securities, FV-NI [Line Items]          
Fair value of assets     7,932.5 $ 7,379.4  
CLO Senior and Subordinated Notes and Derivative Instruments          
Debt and Equity Securities, FV-NI [Line Items]          
Investment in preferred securities     $ 378.9 532.6  
BDC preferred shares | Level III | Other          
Debt and Equity Securities, FV-NI [Line Items]          
Fair value of assets       $ 81.7