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Investments - Principal Investments in CLOs and Other Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Mar. 21, 2022
Dec. 31, 2021
Management Contracts      
Debt and Equity Securities, FV-NI [Line Items]      
Acquired CLO senior and subordinated notes   $ 175.9  
TCG BDC, Inc.      
Debt and Equity Securities, FV-NI [Line Items]      
Trading securities $ 61.2   $ 72.5
Corporate Mezzanine Securities Bonds and Warrants      
Debt and Equity Securities, FV-NI [Line Items]      
Trading securities $ 499.6   $ 361.1