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Related Party Transactions - Amounts Due from Affiliates and Other Receivables (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Related Party Transaction [Line Items]    
Due from affiliates and other receivables, net $ 790.2 $ 805.6
Affiliated Entity    
Related Party Transaction [Line Items]    
Due from affiliates and other receivables, net 790.2 805.6
Accrued incentive fees | Affiliated Entity    
Related Party Transaction [Line Items]    
Due from affiliates and other receivables, net 38.7 33.7
Unbilled receivable for giveback obligations from current and former employees | Affiliated Entity    
Related Party Transaction [Line Items]    
Due from affiliates and other receivables, net 11.5 11.5
Notes receivable and accrued interest from affiliates | Affiliated Entity    
Related Party Transaction [Line Items]    
Due from affiliates and other receivables, net 56.5 46.2
Management fee receivable, net | Affiliated Entity    
Related Party Transaction [Line Items]    
Due from affiliates and other receivables, net 268.9 296.4
Reimbursable expenses and other receivables from unconsolidated funds and affiliates, net | Affiliated Entity    
Related Party Transaction [Line Items]    
Due from affiliates and other receivables, net $ 414.6 $ 417.8