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Summary of Significant Accounting Policies - Assets Recognized in Consolidated Balance Sheets Related to Non-Consolidated VIEs (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Variable Interest Entity [Line Items]    
Investments $ 10,217.6 $ 10,767.9
Total assets 21,381.0 21,403.0
Unconsolidated VIEs    
Variable Interest Entity [Line Items]    
Investments 1,083.4 1,124.0
Accrued performance allocations 441.2 406.0
Management fee receivables 47.3 49.6
Total assets $ 1,571.9 $ 1,579.6