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Securitizations and Variable Interests Entities - Schedule of Carrying Value of Assets and Liabilities of Agency MSR Financing Facility (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Mortgage servicing rights, at fair value $ 2,665.2 $ 2,250.1  
Prepaid lender fees, net 7.7 7.2  
Debt service accounts $ 22.3 $ 10.0 $ 20.1