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Summary of Significant Accounting Policies - Principles of Consolidation (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Variable Interest Entity [Line Items]      
Consolidated VIEs, assets $ 23,103.5 $ 21,176.0 $ 21,403.0
Consolidated VIEs, liabilities 16,755.9 15,391.5  
Investment in CLOs 236.2    
Investment fund 422.2    
Variable Interest Entity, Primary Beneficiary      
Variable Interest Entity [Line Items]      
Consolidated VIEs, assets 8,900.0 7,800.0  
Consolidated VIEs, liabilities $ 7,700.0 $ 6,900.0