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MSR Transfers Not Qualifying for Sale Accounting - Narrative (Details) - NRZ
$ in Millions
Mar. 31, 2022
USD ($)
New RMSR Agreements  
Servicing Assets at Fair Value [Line Items]  
UPB of rights to MSRs sold $ 53,600.0
2017 Agreements and New RMSR Agreements | Mortgage Servicing Rights Title Retained  
Servicing Assets at Fair Value [Line Items]  
UPB of rights to MSRs sold $ 11,700.0