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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
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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

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- Details
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