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Summary of Significant Accounting Policies - Assets Recognized in Consolidated Balance Sheets Related to Non-Consolidated VIEs (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Variable Interest Entity [Line Items]    
Investments $ 11,095.0 $ 9,955.3
Total assets 22,658.4 21,176.0
Unconsolidated VIEs    
Variable Interest Entity [Line Items]    
Investments 1,047.9 1,118.4
Accrued performance allocations 586.6 492.3
Management fee receivables 99.9 65.1
Total assets $ 1,734.4 $ 1,675.8