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Summary of Significant Accounting Policies - Variable Interest Entities (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Variable Interest Entity [Line Items]    
Consolidated VIEs, assets $ 20,849.5 $ 21,176.0
Consolidated VIEs, liabilities 15,109.5 15,391.5
Investments in CLOs 184.4  
Investment fund 319.9  
Consolidated VIEs    
Variable Interest Entity [Line Items]    
Consolidated VIEs, assets 8,100.0 7,800.0
Consolidated VIEs, liabilities $ 7,100.0 $ 6,900.0