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Summary of Significant Accounting Policies - Variable Interest Entities (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Variable Interest Entity [Line Items]    
Consolidated VIEs, assets $ 21,273.9 $ 21,403.0
Consolidated VIEs, liabilities 14,462.4 14,581.7
Investment fund 376.5  
Collateralized Loan Obligations    
Variable Interest Entity [Line Items]    
Investments in CLOs 112.7  
Consolidated VIEs    
Variable Interest Entity [Line Items]    
Consolidated VIEs, assets 7,400.0 7,200.0
Consolidated VIEs, liabilities $ 6,300.0 $ 6,200.0