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Other Financing Liabilities, at Fair Value - Narrative (Details)
$ in Millions
12 Months Ended
May 02, 2022
Dec. 31, 2023
USD ($)
Mar. 31, 2024
USD ($)
subservicer
Servicing Assets at Fair Value [Line Items]      
Automatic renewal term 1 year    
Number of subservicers | subservicer     3
Ocwen Financial Corporation      
Servicing Assets at Fair Value [Line Items]      
Servicing agreements notice of termination 6 months    
Rithm      
Servicing Assets at Fair Value [Line Items]      
Amount derecognized   $ 421.7  
Servicing agreements notice of termination 3 months    
Fair Value Agency Mortgage Servicing Rights | Rithm Capital Corp      
Servicing Assets at Fair Value [Line Items]      
UPB of MSRs sold   $ 33,400.0  
New RMSR Agreements | Rithm      
Servicing Assets at Fair Value [Line Items]      
UPB of rights to MSRs sold     $ 34,400.0
2017 Agreements and New RMSR Agreements | Mortgage Servicing Rights Title Retained | Rithm      
Servicing Assets at Fair Value [Line Items]      
UPB of rights to MSRs sold     $ 9,700.0
Servicing agreements notice of termination 3 months