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Rights to MSRs - Schedule of Assets, Liabilities, Servicing and Subservicing Fees Related to NRZ Agreements (Footnote) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Forecast [Member]    
Servicing Liabilities at Fair Value [Line Items]    
Reduction in the financing liability and interest expense $ 34.1 $ 104.7