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Summary of Significant Accounting Policies - Schedule of Assets Recognized in Consolidated Balance Sheets Related to Non-Consolidated VIEs (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Variable Interest Entity [Line Items]    
Investments $ 11,203.1 $ 10,936.7
Total assets 25,067.8 23,103.5
Unconsolidated VIEs    
Variable Interest Entity [Line Items]    
Investments 824.5 942.6
Accrued performance allocations 710.3 580.8
Management fee receivables 76.0 62.4
Total assets $ 1,610.8 $ 1,585.8