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Related Party Transactions - Amounts Due from Affiliates and Other Receivables (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Related Party Transaction [Line Items]    
Due from affiliates and other receivables, net $ 624.1 $ 691.6
Affiliated Entity    
Related Party Transaction [Line Items]    
Due from affiliates and other receivables, net 624.1 691.6
Accrued incentive fees | Affiliated Entity    
Related Party Transaction [Line Items]    
Due from affiliates and other receivables, net 23.8 22.9
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 39.1 44.2
Management fee receivable, net | Affiliated Entity    
Related Party Transaction [Line Items]    
Due from affiliates and other receivables, net 272.9 277.8
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 $ 276.8 $ 335.2