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Summary of Significant Accounting Policies - Assets Recognized in Consolidated Balance Sheets Related to Non-Consolidated VIEs (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Variable Interest Entity [Line Items]    
Investments $ 9,473.2 $ 9,955.3
Total assets 20,849.5 21,176.0
Unconsolidated VIEs    
Variable Interest Entity [Line Items]    
Investments 1,111.3 1,118.4
Accrued performance allocations 544.6 492.3
Management fee receivables 77.4 65.1
Total assets $ 1,733.3 $ 1,675.8