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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
Sep. 30, 2025
Dec. 31, 2024
Variable Interest Entity [Line Items]    
Investments $ 10,515.4 $ 10,936.7
Total assets 27,055.9 23,103.5
Unconsolidated VIEs    
Variable Interest Entity [Line Items]    
Investments 820.4 942.6
Accrued performance allocations 742.1 580.8
Management fee receivables 84.6 62.4
Total assets $ 1,647.1 $ 1,585.8