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Summary of Significant Accounting Policies - Variable Interest Entities (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Variable Interest Entity [Line Items]    
Consolidated VIEs, assets $ 20,957.3 $ 21,403.0
Consolidated VIEs, liabilities 14,452.5 14,581.7
Investments in CLOs 115.9  
Investment fund 309.8  
Consolidated VIEs    
Variable Interest Entity [Line Items]    
Consolidated VIEs, assets 7,600.0 7,200.0
Consolidated VIEs, liabilities $ 6,700.0 $ 6,200.0