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Summary of Significant Accounting Policies - Variable Interest Entities (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Variable Interest Entity [Line Items]    
Consolidated VIEs, assets $ 21,736.4 $ 21,250.4
Consolidated VIEs, liabilities 15,382.1 15,544.2
Consolidated VIEs    
Variable Interest Entity [Line Items]    
Consolidated VIEs, assets 6,700.0 6,900.0
Consolidated VIEs, liabilities 6,400.0 $ 6,600.0
Consolidated VIEs | Collateralized Loan Obligations    
Variable Interest Entity [Line Items]    
Investments in CLOs $ 137.8