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Securitizations and Variable Interest Entities - Schedule Of Carrying Value and Classification of Assets and Liabilities of Agency MSR Financing Facility (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Servicing Asset $ 2,859.8 $ 2,665.2  
Debt Issuance Costs, Net 11.8 $ 7.7  
Debt service accounts $ 29.7   $ 16.1