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Investments - Principal Investments in CLOs and Other Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items]    
Fair value of assets $ 9,873.2  
Level III    
Debt and Equity Securities, FV-NI [Line Items]    
Fair value of assets 9,379.3 $ 7,932.5
Level III | Other    
Debt and Equity Securities, FV-NI [Line Items]    
Fair value of assets 48.6  
CLO Senior and Subordinated Notes and Derivative Instruments    
Debt and Equity Securities, FV-NI [Line Items]    
Trading securities $ 365.5 378.9
BDC preferred shares | Level III | Other    
Debt and Equity Securities, FV-NI [Line Items]    
Fair value of assets   $ 53.4