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Investments - Principal Investments in CLOs and Other Investments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Mar. 21, 2022
Debt and Equity Securities, FV-NI [Line Items]        
Investment income $ 1,898.0 $ 6,721.9 $ 1,095.2  
Management Contracts        
Debt and Equity Securities, FV-NI [Line Items]        
Acquired CLO senior and subordinated notes       $ 175.9
Principal investment income (loss) from investments in CLOs and other investments- unrealized        
Debt and Equity Securities, FV-NI [Line Items]        
Investment income (54.0) 78.4 $ 2.8  
TCG BDC        
Debt and Equity Securities, FV-NI [Line Items]        
Investment in preferred securities 76.9 72.5    
CLO Senior and Subordinated Notes and Derivative Instruments        
Debt and Equity Securities, FV-NI [Line Items]        
Investment in preferred securities $ 526.1 361.1    
Corporate investment | Principal investment income (loss) from investments in CLOs and other investments- unrealized        
Debt and Equity Securities, FV-NI [Line Items]        
Investment income   $ 49.8