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Summary of Significant Accounting Policies - Investments in Unconsolidated Variable Interest Entities (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Variable Interest Entity [Line Items]      
Investments $ 10,767.9 $ 10,832.0  
Total assets 21,403.0 21,250.4 $ 15,644.8
Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Investments 1,124.0 901.9  
Accrued performance allocations 406.0 368.7  
Management fee receivables 49.6 27.2  
Total assets $ 1,579.6 $ 1,297.8