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Investments - Principal Investments in CLOs and Other Investments (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
TCG BDC, Inc.    
Debt and Equity Securities, FV-NI [Line Items]    
Trading securities $ 79.2 $ 76.9
CLO Senior and Subordinated Notes and Derivative Instruments    
Debt and Equity Securities, FV-NI [Line Items]    
Trading securities $ 538.1 $ 526.1