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Summary of Significant Accounting Policies - Investments in Unconsolidated Variable Interest Entities (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Variable Interest Entity [Line Items]      
Investments $ 10,936.7 $ 9,955.3  
Total assets 23,103.5 21,176.0 $ 21,403.0
Variable Interest Entity, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Investments 942.6 1,118.4  
Accrued performance allocations 580.8 492.3  
Management fee receivables 62.4 65.1  
Total assets $ 1,585.8 $ 1,675.8