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Summary of Significant Accounting Policies - Investments in Unconsolidated Variable Interest Entities (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Variable Interest Entity [Line Items]    
Investments $ 10,784.1 $ 10,767.9
Total assets 21,273.9 21,403.0
Unconsolidated VIEs    
Variable Interest Entity [Line Items]    
Investments 1,084.9 1,124.0
Accrued performance allocations 455.0 406.0
Management fee receivables 43.3 49.6
Total assets $ 1,583.2 $ 1,579.6