Related Party Transactions - Due from Affiliates and Other Receivables (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
Due from affiliates and other receivables, net	$ 691.6	$ 579.4
Affiliates
Related Party Transaction [Line Items]
Due from affiliates and other receivables, net	691.6	579.4
Accrued incentive fees | Affiliates
Related Party Transaction [Line Items]
Due from affiliates and other receivables, net	22.9	16.4
Unbilled receivable for giveback obligations from current and former employees | Affiliates
Related Party Transaction [Line Items]
Due from affiliates and other receivables, net	11.5	10.4
Notes receivable and accrued interest from affiliates | Affiliates
Related Party Transaction [Line Items]
Due from affiliates and other receivables, net	44.2	41.5
Management fee receivable, net | Affiliates
Related Party Transaction [Line Items]
Due from affiliates and other receivables, net	277.8	220.4
Reimbursable expenses and other receivables from unconsolidated funds and affiliates, net | Affiliates
Related Party Transaction [Line Items]
Due from affiliates and other receivables, net	$ 335.2	$ 290.7