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Summary of Significant Accounting Policies - Investments in Unconsolidated Variable Interest Entities (Details) - Unconsolidated VIEs - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Variable Interest Entity [Line Items]    
Investments $ 1,096.8 $ 901.9
Accrued performance revenues 391.1 368.7
Management fee receivables 44.3 27.2
Total $ 1,532.2 $ 1,297.8