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Related Party Transactions - Amounts Due from Affiliates and Other Receivables (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Related Party Transaction [Line Items]    
Due from affiliates and other receivables, net $ 688.3 $ 579.4
Affiliated Entity    
Related Party Transaction [Line Items]    
Due from affiliates and other receivables, net 688.3 579.4
Accrued incentive fees | Affiliated Entity    
Related Party Transaction [Line Items]    
Due from affiliates and other receivables, net 21.9 16.4
Unbilled receivable for giveback obligations from current and former employees | Affiliated Entity    
Related Party Transaction [Line Items]    
Due from affiliates and other receivables, net 10.1 10.4
Notes receivable and accrued interest from affiliates | Affiliated Entity    
Related Party Transaction [Line Items]    
Due from affiliates and other receivables, net 135.7 41.5
Management fee receivable, net | Affiliated Entity    
Related Party Transaction [Line Items]    
Due from affiliates and other receivables, net 226.7 220.4
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 $ 293.9 $ 290.7