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Summary of Significant Accounting Policies - Variable Interest Entities (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Variable Interest Entity [Line Items]    
Consolidated VIEs, assets $ 24,095.5 $ 23,103.5
Consolidated VIEs, liabilities 17,710.3 16,755.9
Investments in CLOs 329.3  
Investment fund 663.6  
Consolidated VIEs    
Variable Interest Entity [Line Items]    
Consolidated VIEs, assets 10,100.0 8,900.0
Consolidated VIEs, liabilities $ 8,800.0 $ 7,700.0